Annotation of loncom/interface/lonnavmaps.pm, revision 1.202
1.2 www 1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
1.1 www 3: #
1.201 bowersj2 4: # $Id: lonnavmaps.pm,v 1.200 2003/06/12 16:21:20 bowersj2 Exp $
1.20 albertel 5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
1.2 www 28: # (Page Handler
1.1 www 29: #
1.2 www 30: # (TeX Content Handler
1.1 www 31: #
1.2 www 32: # 05/29/00,05/30 Gerd Kortemeyer)
33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1 www 35: #
1.17 www 36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21 www 37: # YEAR=2002
38: # 1/1 Gerd Kortemeyer
1.105 bowersj2 39: # Oct-Nov Jeremy Bowers
1.153 bowersj2 40: # YEAR=2003
41: # Jeremy Bowers ... lots of days
1.2 www 42:
1.1 www 43: package Apache::lonnavmaps;
44:
45: use strict;
1.2 www 46: use Apache::Constants qw(:common :http);
1.18 albertel 47: use Apache::loncommon();
1.150 www 48: use Apache::lonmenu();
1.73 bowersj2 49: use POSIX qw (floor strftime);
1.192 bowersj2 50: use Data::Dumper; # for debugging, not always used
1.2 www 51:
1.133 bowersj2 52: # symbolic constants
53: sub SYMB { return 1; }
54: sub URL { return 2; }
55: sub NOTHING { return 3; }
56:
57: # Some data
58:
1.140 bowersj2 59: my $resObj = "Apache::lonnavmaps::resource";
60:
1.135 bowersj2 61: # Keep these mappings in sync with lonquickgrades, which uses the colors
62: # instead of the icons.
63: my %statusIconMap =
1.140 bowersj2 64: ( $resObj->NETWORK_FAILURE => '',
65: $resObj->NOTHING_SET => '',
66: $resObj->CORRECT => 'navmap.correct.gif',
67: $resObj->EXCUSED => 'navmap.correct.gif',
68: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
69: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
70: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
71: $resObj->OPEN_LATER => '',
72: $resObj->TRIES_LEFT => 'navmap.open.gif',
73: $resObj->INCORRECT => 'navmap.wrong.gif',
74: $resObj->OPEN => 'navmap.open.gif',
1.200 bowersj2 75: $resObj->ATTEMPTED => 'navmap.ellipsis.gif',
1.185 bowersj2 76: $resObj->ANSWER_SUBMITTED => '' );
1.135 bowersj2 77:
78: my %iconAltTags =
79: ( 'navmap.correct.gif' => 'Correct',
80: 'navmap.wrong.gif' => 'Incorrect',
81: 'navmap.open.gif' => 'Open' );
1.133 bowersj2 82:
1.136 bowersj2 83: # Defines a status->color mapping, null string means don't color
84: my %colormap =
1.140 bowersj2 85: ( $resObj->NETWORK_FAILURE => '',
86: $resObj->CORRECT => '',
87: $resObj->EXCUSED => '#3333FF',
88: $resObj->PAST_DUE_ANSWER_LATER => '',
89: $resObj->PAST_DUE_NO_ANSWER => '',
90: $resObj->ANSWER_OPEN => '#006600',
91: $resObj->OPEN_LATER => '',
92: $resObj->TRIES_LEFT => '',
93: $resObj->INCORRECT => '',
94: $resObj->OPEN => '',
95: $resObj->NOTHING_SET => '' );
1.136 bowersj2 96: # And a special case in the nav map; what to do when the assignment
97: # is not yet done and due in less then 24 hours
98: my $hurryUpColor = "#FF0000";
1.130 www 99:
1.1 www 100: sub handler {
1.99 bowersj2 101: my $r = shift;
1.118 bowersj2 102: real_handler($r);
103: }
104:
105: sub real_handler {
106: my $r = shift;
1.2 www 107:
1.51 bowersj2 108: # Handle header-only request
109: if ($r->header_only) {
110: if ($ENV{'browser.mathml'}) {
111: $r->content_type('text/xml');
112: } else {
113: $r->content_type('text/html');
114: }
115: $r->send_http_header;
116: return OK;
117: }
118:
119: # Send header, don't cache this page
120: if ($ENV{'browser.mathml'}) {
121: $r->content_type('text/xml');
122: } else {
123: $r->content_type('text/html');
124: }
125: &Apache::loncommon::no_cache($r);
126: $r->send_http_header;
127:
1.106 bowersj2 128: # Create the nav map
1.168 bowersj2 129: my $navmap = Apache::lonnavmaps::navmap->new(
1.51 bowersj2 130: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 131: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 132:
1.55 bowersj2 133:
134: if (!defined($navmap)) {
135: my $requrl = $r->uri;
136: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
137: return HTTP_NOT_ACCEPTABLE;
138: }
1.64 bowersj2 139:
1.111 bowersj2 140: $r->print("<html><head>\n");
1.150 www 141: $r->print("<title>Navigate Course Contents</title>");
142: # ------------------------------------------------------------ Get query string
143: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
1.158 bowersj2 144:
1.150 www 145: # ----------------------------------------------------- Force menu registration
146: my $addentries='';
147: if ($ENV{'form.register'}) {
148: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
149: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
150: $r->print(&Apache::lonmenu::registerurl(1));
151: }
1.111 bowersj2 152:
1.64 bowersj2 153: # Header
1.150 www 154: $r->print('</head>'.
155: &Apache::loncommon::bodytag('Navigate Course Contents','',
1.151 www 156: $addentries,'','',$ENV{'form.register'}));
1.64 bowersj2 157: $r->print('<script>window.focus();</script>');
1.101 bowersj2 158:
1.124 bowersj2 159: $r->rflush();
160:
161: # Now that we've displayed some stuff to the user, init the navmap
162: $navmap->init();
163:
1.95 bowersj2 164: $r->print('<br> ');
165: $r->rflush();
166:
1.55 bowersj2 167: # Check that it's defined
168: if (!($navmap->courseMapDefined())) {
169: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
170: '</body></html>');
171: return OK;
172: }
173:
1.178 bowersj2 174: # See if there's only one map in the top-level, if we don't
175: # already have a filter... if so, automatically display it
1.179 bowersj2 176: if ($ENV{QUERY_STRING} !~ /filter/) {
1.178 bowersj2 177: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
178: my $depth = 1;
179: $iterator->next();
180: my $curRes = $iterator->next();
181: my $sequenceCount = 0;
182: my $sequenceId;
183: while ($depth > 0) {
184: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
185: if ($curRes == $iterator->END_MAP()) { $depth--; }
186:
187: if (ref($curRes) && $curRes->is_sequence()) {
188: $sequenceCount++;
189: $sequenceId = $curRes->map_pc();
1.179 bowersj2 190: }
1.178 bowersj2 191:
192: $curRes = $iterator->next();
193: }
194:
195: if ($sequenceCount == 1) {
196: # The automatic iterator creation in the render call
197: # will pick this up. We know the condition because
198: # the defined($ENV{'form.filter'}) also ensures this
199: # is a fresh call.
200: $ENV{'form.filter'} = "$sequenceId";
1.155 bowersj2 201: }
202: }
203:
1.191 bowersj2 204: my $jumpToFirstHomework = 0;
1.184 bowersj2 205: # Check to see if the student is jumping to next open, do-able problem
206: if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') {
1.191 bowersj2 207: $jumpToFirstHomework = 1;
1.184 bowersj2 208: # Find the next homework problem that they can do.
209: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
210: my $depth = 1;
211: $iterator->next();
212: my $curRes = $iterator->next();
213: my $foundDoableProblem = 0;
214: my $problemRes;
215:
216: while ($depth > 0 && !$foundDoableProblem) {
217: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
218: if ($curRes == $iterator->END_MAP()) { $depth--; }
219:
220: if (ref($curRes) && $curRes->is_problem()) {
221: my $status = $curRes->status();
1.191 bowersj2 222: if ($curRes->completable()) {
1.184 bowersj2 223: $problemRes = $curRes;
224: $foundDoableProblem = 1;
225:
226: # Pop open all previous maps
227: my $stack = $iterator->getStack();
228: pop @$stack; # last resource in the stack is the problem
229: # itself, which we don't need in the map stack
230: my @mapPcs = map {$_->map_pc()} @$stack;
231: $ENV{'form.filter'} = join(',', @mapPcs);
232:
233: # Mark as both "here" and "jump"
234: $ENV{'form.postsymb'} = $curRes->symb();
235: }
236: }
237: } continue {
238: $curRes = $iterator->next();
239: }
240:
241: # If we found no problems, print a note to that effect.
242: if (!$foundDoableProblem) {
243: $r->print("<font size='+2'>All homework assignments have been completed.</font><br /><br />");
244: }
245: } else {
246: $r->print("<a href='navmaps?jumpToFirstHomework'>" .
247: "Go To My First Homework Problem</a><br />");
248: }
249:
1.191 bowersj2 250: my $suppressEmptySequences = 0;
251: my $filterFunc = undef;
1.201 bowersj2 252: my $resource_no_folder_link = 0;
253:
1.191 bowersj2 254: # Display only due homework.
255: my $showOnlyHomework = 0;
256: if ($ENV{QUERY_STRING} eq 'showOnlyHomework') {
257: $showOnlyHomework = 1;
258: $suppressEmptySequences = 1;
259: $filterFunc = sub { my $res = shift;
1.201 bowersj2 260: return $res->completable() || $res->is_map();
1.191 bowersj2 261: };
262: $r->print("<p><font size='+2'>Uncompleted Homework</font></p>");
263: $ENV{'form.filter'} = '';
264: $ENV{'form.condition'} = 1;
1.201 bowersj2 265: $resource_no_folder_link = 1;
1.191 bowersj2 266: } else {
267: $r->print("<a href='navmaps?showOnlyHomework'>" .
268: "Show Only Uncompleted Homework</a><br />");
269: }
270:
1.133 bowersj2 271: # renderer call
1.191 bowersj2 272: my $renderArgs = { 'cols' => [0,1,2,3],
273: 'url' => '/adm/navmaps',
274: 'navmap' => $navmap,
275: 'suppressNavmap' => 1,
276: 'suppressEmptySequences' => $suppressEmptySequences,
277: 'filterFunc' => $filterFunc,
1.201 bowersj2 278: 'resource_no_folder_link' => $resource_no_folder_link,
1.191 bowersj2 279: 'r' => $r};
280: my $render = render($renderArgs);
281: $navmap->untieHashes();
1.133 bowersj2 282:
1.191 bowersj2 283: # If no resources were printed, print a reassuring message so the
284: # user knows there was no error.
285: if ($renderArgs->{'counter'} == 0) {
286: if ($showOnlyHomework) {
287: $r->print("<p><font size='+1'>All homework is currently completed.</font></p>");
288: } else { # both jumpToFirstHomework and normal use the same: course must be empty
289: $r->print("<p><font size='+1'>This course is empty.</font></p>");
290: }
291: }
1.51 bowersj2 292:
1.128 bowersj2 293: $r->print("</body></html>");
1.134 bowersj2 294: $r->rflush();
1.59 bowersj2 295:
1.51 bowersj2 296: return OK;
297: }
298:
299: # Convenience functions: Returns a string that adds or subtracts
300: # the second argument from the first hash, appropriate for the
301: # query string that determines which folders to recurse on
302: sub addToFilter {
303: my $hashIn = shift;
304: my $addition = shift;
305: my %hash = %$hashIn;
306: $hash{$addition} = 1;
307:
308: return join (",", keys(%hash));
309: }
310:
311: sub removeFromFilter {
312: my $hashIn = shift;
313: my $subtraction = shift;
314: my %hash = %$hashIn;
315:
316: delete $hash{$subtraction};
317: return join(",", keys(%hash));
318: }
319:
320: # Convenience function: Given a stack returned from getStack on the iterator,
321: # return the correct src() value.
322: # Later, this should add an anchor when we start putting anchors in pages.
323: sub getLinkForResource {
324: my $stack = shift;
325: my $res;
326:
327: # Check to see if there are any pages in the stack
328: foreach $res (@$stack) {
329: if (defined($res) && $res->is_page()) {
330: return $res->src();
331: }
332: }
333:
334: # Failing that, return the src of the last resource that is defined
335: # (when we first recurse on a map, it puts an undefined resource
336: # on the bottom because $self->{HERE} isn't defined yet, and we
337: # want the src for the map anyhow)
338: foreach (@$stack) {
339: if (defined($_)) { $res = $_; }
340: }
341:
342: return $res->src();
343: }
344:
1.53 bowersj2 345: # Convenience function: This seperates the logic of how to create
346: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
347: # etc.) into a seperate function. It takes a resource object as the
348: # first parameter, and the part number of the resource as the second.
349: # It's basically a big switch statement on the status of the resource.
350:
351: sub getDescription {
352: my $res = shift;
353: my $part = shift;
1.69 bowersj2 354: my $status = $res->status($part);
1.53 bowersj2 355:
1.182 bowersj2 356: if ($status == $res->NETWORK_FAILURE) {
357: return "Having technical difficulties; please check status later";
358: }
1.53 bowersj2 359: if ($status == $res->NOTHING_SET) {
360: return "Not currently assigned.";
361: }
362: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 363: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 364: }
365: if ($status == $res->OPEN) {
1.79 bowersj2 366: if ($res->duedate($part)) {
1.73 bowersj2 367: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 368: } else {
369: return "Open, no due date";
370: }
1.53 bowersj2 371: }
1.54 bowersj2 372: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 373: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 374: }
375: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 376: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 377: }
378: if ($status == $res->ANSWER_OPEN) {
379: return "Answer available";
380: }
1.59 bowersj2 381: if ($status == $res->EXCUSED) {
1.66 bowersj2 382: return "Excused by instructor";
1.59 bowersj2 383: }
1.69 bowersj2 384: if ($status == $res->ATTEMPTED) {
1.200 bowersj2 385: return "Answer submitted, not yet graded.";
1.69 bowersj2 386: }
1.59 bowersj2 387: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 388: my $tries = $res->tries($part);
389: my $maxtries = $res->maxtries($part);
390: my $triesString = "";
391: if ($tries && $maxtries) {
392: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
393: if ($maxtries > 1 && $maxtries - $tries == 1) {
394: $triesString = "<b>$triesString</b>";
395: }
396: }
1.66 bowersj2 397: if ($res->duedate()) {
1.73 bowersj2 398: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 399: " $triesString";
400: } else {
401: return "No due date $triesString";
402: }
1.59 bowersj2 403: }
1.185 bowersj2 404: if ($status == $res->ANSWER_SUBMITTED) {
405: return 'Answer submitted';
406: }
1.53 bowersj2 407: }
408:
1.115 bowersj2 409: # Convenience function, so others can use it: Is the problem due in less then
410: # 24 hours, and still can be done?
411:
412: sub dueInLessThen24Hours {
413: my $res = shift;
414: my $part = shift;
415: my $status = $res->status($part);
416:
417: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
418: $status == $res->TRIES_LEFT()) &&
419: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
420: $res->duedate() > time();
421: }
422:
423: # Convenience function, so others can use it: Is there only one try remaining for the
424: # part, with more then one try to begin with, not due yet and still can be done?
425: sub lastTry {
426: my $res = shift;
427: my $part = shift;
428:
429: my $tries = $res->tries($part);
430: my $maxtries = $res->maxtries($part);
431: return $tries && $maxtries && $maxtries > 1 &&
432: $maxtries - $tries == 1 && $res->duedate() &&
433: $res->duedate() > time();
434: }
435:
1.101 bowersj2 436: # This puts a human-readable name on the ENV variable.
1.177 www 437:
1.68 bowersj2 438: sub advancedUser {
1.177 www 439: return $ENV{'request.role.adv'};
1.68 bowersj2 440: }
441:
1.73 bowersj2 442:
443: # timeToHumanString takes a time number and converts it to a
444: # human-readable representation, meant to be used in the following
445: # manner:
446: # print "Due $timestring"
447: # print "Open $timestring"
448: # print "Answer available $timestring"
449: # Very, very, very, VERY English-only... goodness help a localizer on
450: # this func...
1.53 bowersj2 451: sub timeToHumanString {
1.58 albertel 452: my ($time) = @_;
453: # zero, '0' and blank are bad times
1.73 bowersj2 454: if (!$time) {
455: return 'never';
456: }
457:
458: my $now = time();
459:
460: my @time = localtime($time);
461: my @now = localtime($now);
462:
463: # Positive = future
464: my $delta = $time - $now;
465:
466: my $minute = 60;
467: my $hour = 60 * $minute;
468: my $day = 24 * $hour;
469: my $week = 7 * $day;
470: my $inPast = 0;
471:
472: # Logic in comments:
473: # Is it now? (extremely unlikely)
474: if ( $delta == 0 ) {
475: return "this instant";
476: }
477:
478: if ($delta < 0) {
479: $inPast = 1;
480: $delta = -$delta;
481: }
482:
483: if ( $delta > 0 ) {
1.101 bowersj2 484:
1.73 bowersj2 485: my $tense = $inPast ? " ago" : "";
486: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 487:
488: # Less then a minute
1.73 bowersj2 489: if ( $delta < $minute ) {
490: if ($delta == 1) { return "${prefix}1 second$tense"; }
491: return "$prefix$delta seconds$tense";
492: }
493:
1.101 bowersj2 494: # Less then an hour
1.73 bowersj2 495: if ( $delta < $hour ) {
496: # If so, use minutes
497: my $minutes = floor($delta / 60);
498: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
499: return "$prefix$minutes minutes$tense";
500: }
501:
502: # Is it less then 24 hours away? If so,
503: # display hours + minutes
504: if ( $delta < $hour * 24) {
505: my $hours = floor($delta / $hour);
506: my $minutes = floor(($delta % $hour) / $minute);
507: my $hourString = "$hours hours";
508: my $minuteString = ", $minutes minutes";
509: if ($hours == 1) {
510: $hourString = "1 hour";
511: }
512: if ($minutes == 1) {
513: $minuteString = ", 1 minute";
514: }
515: if ($minutes == 0) {
516: $minuteString = "";
517: }
518: return "$prefix$hourString$minuteString$tense";
519: }
520:
521: # Less then 5 days away, display day of the week and
522: # HH:MM
523: if ( $delta < $day * 5 ) {
1.85 bowersj2 524: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 525: $timeStr =~ s/12:00 am/midnight/;
526: $timeStr =~ s/12:00 pm/noon/;
527: return ($inPast ? "last " : "next ") .
528: $timeStr;
529: }
530:
531: # Is it this year?
532: if ( $time[5] == $now[5]) {
533: # Return on Month Day, HH:MM meridian
534: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
535: $timeStr =~ s/12:00 am/midnight/;
536: $timeStr =~ s/12:00 pm/noon/;
537: return $timeStr;
538: }
539:
540: # Not this year, so show the year
541: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
542: $timeStr =~ s/12:00 am/midnight/;
543: $timeStr =~ s/12:00 pm/noon/;
544: return $timeStr;
1.58 albertel 545: }
1.53 bowersj2 546: }
547:
1.51 bowersj2 548:
1.133 bowersj2 549: =pod
550:
1.174 albertel 551: =head1 NAME
552:
553: Apache::lonnavmap - Subroutines to handle and render the navigation maps
554:
555: =head1 SYNOPSIS
556:
557: The main handler generates the navigational listing for the course,
558: the other objects export this information in a usable fashion for
559: other modules
1.133 bowersj2 560:
1.174 albertel 561: =head1 Object: render
1.133 bowersj2 562:
1.174 albertel 563: The navmap renderer package provides a sophisticated rendering of the
564: standard navigation maps interface into HTML. The provided nav map
565: handler is actually just a glorified call to this.
1.133 bowersj2 566:
1.174 albertel 567: Because of the large number of parameters this function presents,
568: instead of passing it arguments as is normal, pass it in an anonymous
569: hash with the given options. This is because there is no obvious order
570: you may wish to override these in and a hash is easier to read and
571: understand then "undef, undef, undef, 1, undef, undef, renderButton,
572: undef, 0" when you mostly want default behaviors.
573:
574: The package provides a function called 'render', called as
575: Apache::lonnavmaps::renderer->render({}).
1.51 bowersj2 576:
1.133 bowersj2 577: =head2 Overview of Columns
1.51 bowersj2 578:
1.174 albertel 579: The renderer will build an HTML table for the navmap and return
580: it. The table is consists of several columns, and a row for each
581: resource (or possibly each part). You tell the renderer how many
582: columns to create and what to place in each column, optionally using
583: one or more of the preparent columns, and the renderer will assemble
584: the table.
585:
586: Any additional generally useful column types should be placed in the
587: renderer code here, so anybody can use it anywhere else. Any code
588: specific to the current application (such as the addition of <input>
589: elements in a column) should be placed in the code of the thing using
590: the renderer.
591:
592: At the core of the renderer is the array reference COLS (see Example
593: section below for how to pass this correctly). The COLS array will
594: consist of entries of one of two types of things: Either an integer
595: representing one of the pre-packaged column types, or a sub reference
596: that takes a resource reference, a part number, and a reference to the
597: argument hash passed to the renderer, and returns a string that will
598: be inserted into the HTML representation as it.
599:
600: The pre-packaged column names are refered to by constants in the
601: Apache::lonnavmaps::renderer namespace. The following currently exist:
1.51 bowersj2 602:
1.174 albertel 603: =over 4
1.51 bowersj2 604:
1.174 albertel 605: =item * B<resource>:
1.51 bowersj2 606:
1.174 albertel 607: The general info about the resource: Link, icon for the type, etc. The
608: first column in the standard nav map display. This column also accepts
609: the following parameter in the renderer hash:
1.51 bowersj2 610:
1.133 bowersj2 611: =over 4
1.51 bowersj2 612:
1.174 albertel 613: =item * B<resource_nolink>:
1.51 bowersj2 614:
1.174 albertel 615: If true, the resource will not be linked. Default: false, resource
616: will have links.
617:
618: =item * B<resource_part_count>:
1.51 bowersj2 619:
1.174 albertel 620: If true (default), the resource will show a part count if the full
621: part list is not displayed. If false, the resource will never show a
622: part count.
1.133 bowersj2 623:
1.174 albertel 624: =item * B<resource_no_folder_link>:
1.133 bowersj2 625:
1.174 albertel 626: If true, the resource's folder will not be clickable to open or close
627: it. Default is false. True implies printCloseAll is false, since you
628: can't close or open folders when this is on anyhow.
1.144 bowersj2 629:
1.133 bowersj2 630: =back
1.51 bowersj2 631:
1.174 albertel 632: =item B<communication_status>:
633:
634: Whether there is discussion on the resource, email for the user, or
635: (lumped in here) perl errors in the execution of the problem. This is
636: the second column in the main nav map.
637:
638: =item B<quick_status>:
1.51 bowersj2 639:
1.174 albertel 640: An icon for the status of a problem, with four possible states:
641: Correct, incorrect, open, or none (not open yet, not a problem). The
642: third column of the standard navmap.
1.51 bowersj2 643:
1.174 albertel 644: =item B<long_status>:
645:
646: A text readout of the details of the current status of the problem,
647: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 648:
1.133 bowersj2 649: =back
1.51 bowersj2 650:
1.133 bowersj2 651: If you add any others please be sure to document them here.
1.51 bowersj2 652:
1.174 albertel 653: An example of a column renderer that will show the ID number of a
654: resource, along with the part name if any:
1.51 bowersj2 655:
1.133 bowersj2 656: sub {
657: my ($resource, $part, $params) = @_;
658: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
659: return '<td>' . $resource->{ID} . '</td>';
660: }
1.51 bowersj2 661:
1.174 albertel 662: Note these functions are responsible for the TD tags, which allow them
663: to override vertical and horizontal alignment, etc.
1.130 www 664:
1.133 bowersj2 665: =head2 Parameters
1.115 bowersj2 666:
1.174 albertel 667: Most of these parameters are only useful if you are *not* using the
668: folder interface (i.e., the default first column), which is probably
669: the common case. If you are using this interface, then you should be
670: able to get away with just using 'cols' (to specify the columns
671: shown), 'url' (necessary for the folders to link to the current screen
672: correctly), and possibly 'queryString' if your app calls for it. In
673: that case, maintaining the state of the folders will be done
674: automatically.
1.140 bowersj2 675:
1.133 bowersj2 676: =over 4
1.51 bowersj2 677:
1.174 albertel 678: =item * B<iterator>:
679:
680: A reference to a fresh ::iterator to use from the navmaps. The
681: rendering will reflect the options passed to the iterator, so you can
682: use that to just render a certain part of the course, if you like. If
683: one is not passed, the renderer will attempt to construct one from
684: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
685: 'iterator_map' parameter if any.
686:
687: =item * B<iterator_map>:
688:
689: If you are letting the renderer do the iterator handling, you can
690: instruct the renderer to render only a particular map by passing it
691: the source of the map you want to process, like
692: '/res/103/jerf/navmap.course.sequence'.
693:
694: =item * B<navmap>:
695:
696: A reference to a navmap, used only if an iterator is not passed in. If
697: this is necessary to make an iterator but it is not passed in, a new
698: one will be constructed based on ENV info. This is useful to do basic
699: error checking before passing it off to render.
700:
701: =item * B<r>:
702:
703: The standard Apache response object. This must be passed to the
704: renderer or the course hash will be locked.
705:
706: =item * B<cols>:
707:
708: An array reference
709:
710: =item * B<showParts>:
711:
712: A flag. If yes (default), a line for the resource itself, and a line
713: for each part will be displayed. If not, only one line for each
714: resource will be displayed.
715:
716: =item * B<condenseParts>:
717:
718: A flag. If yes (default), if all parts of the problem have the same
719: status and that status is Nothing Set, Correct, or Network Failure,
720: then only one line will be displayed for that resource anyhow. If no,
721: all parts will always be displayed. If showParts is 0, this is
722: ignored.
723:
724: =item * B<jumpCount>:
725:
726: A string identifying the URL to place the anchor 'curloc' at. Default
727: to no anchor at all. It is the responsibility of the renderer user to
728: ensure that the #curloc is in the URL. By default, determined through
729: the use of the ENV{} 'jump' information, and should normally "just
730: work" correctly.
1.144 bowersj2 731:
1.174 albertel 732: =item * B<here>:
1.140 bowersj2 733:
1.174 albertel 734: A Symb identifying where to place the 'here' marker. Default empty,
735: which means no marker.
1.92 bowersj2 736:
1.174 albertel 737: =item * B<indentString>:
1.164 bowersj2 738:
1.174 albertel 739: A string identifying the indentation string to use. By default, this
740: is a 25 pixel whitespace image with no alt text.
1.92 bowersj2 741:
1.174 albertel 742: =item * B<queryString>:
1.51 bowersj2 743:
1.174 albertel 744: A string which will be prepended to the query string used when the
745: folders are opened or closed.
1.55 bowersj2 746:
1.174 albertel 747: =item * B<url>:
1.84 bowersj2 748:
1.174 albertel 749: The url the folders will link to, which should be the current
750: page. Required if the resource info column is shown.
1.115 bowersj2 751:
1.174 albertel 752: =item * B<currentJumpIndex>:
1.55 bowersj2 753:
1.174 albertel 754: Describes the currently-open row number to cause the browser to jump
755: to, because the user just opened that folder. By default, pulled from
756: the Jump information in the ENV{'form.*'}.
1.51 bowersj2 757:
1.174 albertel 758: =item * B<printKey>:
1.51 bowersj2 759:
1.174 albertel 760: If true, print the key that appears on the top of the standard
761: navmaps. Default is false.
1.139 bowersj2 762:
1.174 albertel 763: =item * B<printCloseAll>:
1.140 bowersj2 764:
1.174 albertel 765: If true, print the "Close all folders" or "open all folders"
766: links. Default is true.
1.140 bowersj2 767:
1.174 albertel 768: =item * B<filterFunc>:
1.153 bowersj2 769:
1.174 albertel 770: A function that takes the resource object as its only parameter and
771: returns a true or false value. If true, the resource is displayed. If
772: false, it is simply skipped in the display. By default, all resources
773: are shown.
774:
1.190 bowersj2 775: =item * B<suppressEmptySequences>:
776:
777: If you're using a filter function, and displaying sequences to orient
778: the user, then frequently some sequences will be empty. Setting this to
779: true will cause those sequences not to display, so as not to confuse the
780: user into thinking that if the sequence is there there should be things
781: under it.
782:
1.174 albertel 783: =item * B<suppressNavmaps>:
784:
785: If true, will not display Navigate Content resources. Default to
786: false.
1.143 bowersj2 787:
1.133 bowersj2 788: =back
1.51 bowersj2 789:
1.133 bowersj2 790: =head2 Additional Info
1.51 bowersj2 791:
1.174 albertel 792: In addition to the parameters you can pass to the renderer, which will
793: be passed through unchange to the column renderers, the renderer will
794: generate the following information which your renderer may find
795: useful:
796:
797: If you want to know how many rows were printed, the 'counter' element
798: of the hash passed into the render function will contain the
799: count. You may want to check whether any resources were printed at
800: all.
1.145 bowersj2 801:
1.133 bowersj2 802: =over 4
1.59 bowersj2 803:
1.133 bowersj2 804: =back
1.59 bowersj2 805:
1.133 bowersj2 806: =cut
1.59 bowersj2 807:
1.133 bowersj2 808: sub resource { return 0; }
809: sub communication_status { return 1; }
810: sub quick_status { return 2; }
811: sub long_status { return 3; }
1.124 bowersj2 812:
1.133 bowersj2 813: # Data for render_resource
1.51 bowersj2 814:
1.133 bowersj2 815: sub render_resource {
816: my ($resource, $part, $params) = @_;
1.51 bowersj2 817:
1.133 bowersj2 818: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 819:
1.134 bowersj2 820: my $link = $params->{"resourceLink"};
821: my $src = $resource->src();
822: my $it = $params->{"iterator"};
1.133 bowersj2 823: my $filter = $it->{FILTER};
824:
825: my $title = $resource->compTitle();
826: if ($src =~ /^\/uploaded\//) {
827: $nonLinkedText=$title;
828: $title = '';
829: }
830: my $partLabel = "";
831: my $newBranchText = "";
832:
833: # If this is a new branch, label it so
834: if ($params->{'isNewBranch'}) {
835: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51 bowersj2 836: }
837:
1.133 bowersj2 838: # links to open and close the folder
839: my $linkopen = "<a href='$link'>";
840: my $linkclose = "</a>";
1.51 bowersj2 841:
1.133 bowersj2 842: # Default icon: HTML page
843: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
844:
845: if ($resource->is_problem()) {
1.192 bowersj2 846: if ($part eq '0' || $params->{'condensed'}) {
1.133 bowersj2 847: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
848: } else {
849: $icon = $params->{'indentString'};
850: }
851: }
1.51 bowersj2 852:
1.133 bowersj2 853: # Display the correct map icon to open or shut map
854: if ($resource->is_map()) {
855: my $mapId = $resource->map_pc();
856: my $nowOpen = !defined($filter->{$mapId});
857: if ($it->{CONDITION}) {
858: $nowOpen = !$nowOpen;
859: }
1.144 bowersj2 860:
861: if (!$params->{'resource_no_folder_link'}) {
862: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
863: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
864:
865: $linkopen = "<a href='" . $params->{'url'} . '?' .
866: $params->{'queryString'} . '&filter=';
867: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
868: addToFilter($filter, $mapId) :
869: removeFromFilter($filter, $mapId);
870: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
871: . $params->{'hereType'} . '&here=' .
872: &Apache::lonnet::escape($params->{'here'}) .
1.159 bowersj2 873: '&jump=' .
1.144 bowersj2 874: &Apache::lonnet::escape($resource->symb()) .
875: "&folderManip=1'>";
876: } else {
877: # Don't allow users to manipulate folder
878: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
879: '.nomanip.gif';
880: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
881:
882: $linkopen = "";
883: $linkclose = "";
884: }
1.133 bowersj2 885: }
1.51 bowersj2 886:
1.133 bowersj2 887: if ($resource->randomout()) {
888: $nonLinkedText .= ' <i>(hidden)</i> ';
889: }
890:
891: # We're done preparing and finally ready to start the rendering
892: my $result = "<td align='left' valign='center'>";
1.140 bowersj2 893:
894: my $indentLevel = $params->{'indentLevel'};
895: if ($newBranchText) { $indentLevel--; }
896:
1.133 bowersj2 897: # print indentation
1.140 bowersj2 898: for (my $i = 0; $i < $indentLevel; $i++) {
1.133 bowersj2 899: $result .= $params->{'indentString'};
1.84 bowersj2 900: }
901:
1.133 bowersj2 902: # Decide what to display
903: $result .= "$newBranchText$linkopen$icon$linkclose";
904:
905: my $curMarkerBegin = '';
906: my $curMarkerEnd = '';
1.51 bowersj2 907:
1.133 bowersj2 908: # Is this the current resource?
1.158 bowersj2 909: if (!$params->{'displayedHereMarker'} &&
910: $resource->symb() eq $params->{'here'} ) {
1.133 bowersj2 911: $curMarkerBegin = '<font color="red" size="+2">> </font>';
912: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.158 bowersj2 913: $params->{'displayedHereMarker'} = 1;
1.51 bowersj2 914: }
915:
1.192 bowersj2 916: if ($resource->is_problem() && $part ne '0' &&
1.133 bowersj2 917: !$params->{'condensed'}) {
918: $partLabel = " (Part $part)";
919: $title = "";
1.51 bowersj2 920: }
921:
1.163 bowersj2 922: if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133 bowersj2 923: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 924: }
925:
1.202 ! bowersj2 926: if (!$params->{'resource_nolink'} && $src !~ /^\/uploaded\//) {
1.144 bowersj2 927: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
928: } else {
929: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
930: }
1.51 bowersj2 931:
1.133 bowersj2 932: return $result;
933: }
1.51 bowersj2 934:
1.133 bowersj2 935: sub render_communication_status {
936: my ($resource, $part, $params) = @_;
1.134 bowersj2 937: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
938:
939: my $link = $params->{"resourceLink"};
940: my $linkopen = "<a href='$link'>";
941: my $linkclose = "</a>";
942:
943: if ($resource->hasDiscussion()) {
944: $discussionHTML = $linkopen .
945: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
946: $linkclose;
947: }
948:
949: if ($resource->getFeedback()) {
950: my $feedback = $resource->getFeedback();
951: foreach (split(/\,/, $feedback)) {
952: if ($_) {
953: $feedbackHTML .= ' <a href="/adm/email?display='
954: . &Apache::lonnet::escape($_) . '">'
955: . '<img src="/adm/lonMisc/feedback.gif" '
956: . 'border="0" /></a>';
957: }
958: }
959: }
960:
961: if ($resource->getErrors()) {
962: my $errors = $resource->getErrors();
963: foreach (split(/,/, $errors)) {
964: if ($_) {
965: $errorHTML .= ' <a href="/adm/email?display='
966: . &Apache::lonnet::escape($_) . '">'
967: . '<img src="/adm/lonMisc/bomb.gif" '
968: . 'border="0" /></a>';
969: }
970: }
1.197 bowersj2 971: }
972:
973: if ($params->{'multipart'} && $part != '0') {
974: $discussionHTML = $feedbackHTML = $errorHTML = '';
1.134 bowersj2 975: }
976:
977: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
978:
1.133 bowersj2 979: }
980: sub render_quick_status {
981: my ($resource, $part, $params) = @_;
1.135 bowersj2 982: my $result = "";
983: my $firstDisplayed = !$params->{'condensed'} &&
984: $params->{'multipart'} && $part eq "0";
985:
986: my $link = $params->{"resourceLink"};
987: my $linkopen = "<a href='$link'>";
988: my $linkclose = "</a>";
989:
990: if ($resource->is_problem() &&
991: !$firstDisplayed) {
992: my $icon = $statusIconMap{$resource->status($part)};
993: my $alt = $iconAltTags{$icon};
994: if ($icon) {
995: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
996: } else {
997: $result .= "<td width='30'> </td>\n";
998: }
999: } else { # not problem, no icon
1000: $result .= "<td width='30'> </td>\n";
1001: }
1002:
1003: return $result;
1.133 bowersj2 1004: }
1005: sub render_long_status {
1006: my ($resource, $part, $params) = @_;
1.136 bowersj2 1007: my $result = "<td align='right' valign='center'>\n";
1008: my $firstDisplayed = !$params->{'condensed'} &&
1009: $params->{'multipart'} && $part eq "0";
1010:
1011: my $color;
1.192 bowersj2 1012: if ($resource->is_problem() && ($resource->countParts() <= 1 || $part ne '') ) {
1.136 bowersj2 1013: $color = $colormap{$resource->status};
1014:
1015: if (dueInLessThen24Hours($resource, $part) ||
1016: lastTry($resource, $part)) {
1017: $color = $hurryUpColor;
1018: }
1019: }
1020:
1021: if ($resource->kind() eq "res" &&
1022: $resource->is_problem() &&
1023: !$firstDisplayed) {
1024: if ($color) {$result .= "<font color=\"$color\"><b>"; }
1025: $result .= getDescription($resource, $part);
1026: if ($color) {$result .= "</b></font>"; }
1027: }
1028: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
1029: $result .= '(randomly select ' . $resource->randompick() .')';
1030: }
1031:
1032: return $result;
1.51 bowersj2 1033: }
1034:
1.133 bowersj2 1035: my @preparedColumns = (\&render_resource, \&render_communication_status,
1036: \&render_quick_status, \&render_long_status);
1.132 bowersj2 1037:
1038: sub setDefault {
1039: my ($val, $default) = @_;
1040: if (!defined($val)) { return $default; }
1041: return $val;
1042: }
1043:
1044: sub render {
1045: my $args = shift;
1.140 bowersj2 1046: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
1047: my $result = '';
1048:
1.132 bowersj2 1049: # Configure the renderer.
1050: my $cols = $args->{'cols'};
1051: if (!defined($cols)) {
1052: # no columns, no nav maps.
1053: return '';
1054: }
1.140 bowersj2 1055: my $mustCloseNavMap = 0;
1056: my $navmap;
1057: if (defined($args->{'navmap'})) {
1058: $navmap = $args->{'navmap'};
1059: }
1060:
1.158 bowersj2 1061: my $r = $args->{'r'};
1.140 bowersj2 1062: my $queryString = $args->{'queryString'};
1.159 bowersj2 1063: my $jump = $args->{'jump'};
1.158 bowersj2 1064: my $here = $args->{'here'};
1.153 bowersj2 1065: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.140 bowersj2 1066: my $currentJumpDelta = 2; # change this to change how many resources are displayed
1067: # before the current resource when using #current
1068:
1069: # If we were passed 'here' information, we are not rendering
1070: # after a folder manipulation, and we were not passed an
1071: # iterator, make sure we open the folders to show the "here"
1072: # marker
1073: my $filterHash = {};
1074: # Figure out what we're not displaying
1075: foreach (split(/\,/, $ENV{"form.filter"})) {
1076: if ($_) {
1077: $filterHash->{$_} = "1";
1078: }
1079: }
1080:
1.191 bowersj2 1081: # Filter: Remember filter function and add our own filter: Refuse
1082: # to show hidden resources unless the user can see them.
1083: my $userCanSeeHidden = advancedUser();
1084: my $filterFunc = setDefault($args->{'filterFunc'},
1085: sub {return 1;});
1086: if (!$userCanSeeHidden) {
1087: # Without renaming the filterfunc, the server seems to go into
1088: # an infinite loop
1089: my $oldFilterFunc = $filterFunc;
1090: $filterFunc = sub { my $res = shift; return !$res->randomout() &&
1091: &$oldFilterFunc($res);};
1092: }
1093:
1.140 bowersj2 1094: my $condition = 0;
1095: if ($ENV{'form.condition'}) {
1096: $condition = 1;
1097: }
1098:
1099: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
1100: # Step 1: Check to see if we have a navmap
1101: if (!defined($navmap)) {
1.171 bowersj2 1102: $navmap = Apache::lonnavmaps::navmap->new(
1.140 bowersj2 1103: $ENV{"request.course.fn"}.".db",
1104: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1105: $mustCloseNavMap = 1;
1106: }
1107: $navmap->init();
1108:
1109: # Step two: Locate what kind of here marker is necessary
1110: # Determine where the "here" marker is and where the screen jumps to.
1111:
1.175 bowersj2 1112: if ($ENV{'form.postsymb'}) {
1113: $here = $jump = $ENV{'form.postsymb'};
1.140 bowersj2 1114: } elsif ($ENV{'form.postdata'}) {
1115: # couldn't find a symb, is there a URL?
1116: my $currenturl = $ENV{'form.postdata'};
1.158 bowersj2 1117: #$currenturl=~s/^http\:\/\///;
1118: #$currenturl=~s/^[^\/]+//;
1.140 bowersj2 1119:
1.158 bowersj2 1120: $here = $jump = &Apache::lonnet::symbread($currenturl);
1.140 bowersj2 1121: }
1.158 bowersj2 1122:
1.140 bowersj2 1123: # Step three: Ensure the folders are open
1124: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1125: my $depth = 1;
1126: $mapIterator->next(); # discard the first BEGIN_MAP
1127: my $curRes = $mapIterator->next();
1128: my $found = 0;
1129:
1130: # We only need to do this if we need to open the maps to show the
1131: # current position. This will change the counter so we can't count
1132: # for the jump marker with this loop.
1133: while ($depth > 0 && !$found) {
1134: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1135: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1136:
1.158 bowersj2 1137: if (ref($curRes) && $curRes->symb() eq $here) {
1.140 bowersj2 1138: my $mapStack = $mapIterator->getStack();
1139:
1140: # Ensure the parent maps are open
1141: for my $map (@{$mapStack}) {
1142: if ($condition) {
1143: undef $filterHash->{$map->map_pc()};
1144: } else {
1145: $filterHash->{$map->map_pc()} = 1;
1146: }
1147: }
1148: $found = 1;
1149: }
1150:
1151: $curRes = $mapIterator->next();
1152: }
1.159 bowersj2 1153: }
1.140 bowersj2 1154:
1155: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1156: # If this is a click on a folder or something, we want to preserve the "here"
1157: # from the querystring, and get the new "jump" marker
1158: $here = $ENV{'form.here'};
1159: $jump = $ENV{'form.jump'};
1160: }
1161:
1.132 bowersj2 1162: my $it = $args->{'iterator'};
1163: if (!defined($it)) {
1.140 bowersj2 1164: # Construct a default iterator based on $ENV{'form.'} information
1165:
1166: # Step 1: Check to see if we have a navmap
1167: if (!defined($navmap)) {
1.164 bowersj2 1168: $navmap = Apache::lonnavmaps::navmap->new($r,
1.140 bowersj2 1169: $ENV{"request.course.fn"}.".db",
1170: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1171: $mustCloseNavMap = 1;
1172: }
1173: # Paranoia: Make sure it's ready
1174: $navmap->init();
1175:
1.144 bowersj2 1176: # See if we're being passed a specific map
1177: if ($args->{'iterator_map'}) {
1178: my $map = $args->{'iterator_map'};
1.145 bowersj2 1179: $map = $navmap->getResourceByUrl($map);
1.144 bowersj2 1180: my $firstResource = $map->map_start();
1181: my $finishResource = $map->map_finish();
1182:
1183: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1184: } else {
1185: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1186: }
1.132 bowersj2 1187: }
1188:
1.159 bowersj2 1189: # (re-)Locate the jump point, if any
1.191 bowersj2 1190: # Note this does not take filtering or hidden into account... need
1191: # to be fixed?
1.159 bowersj2 1192: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1193: my $depth = 1;
1194: $mapIterator->next();
1195: my $curRes = $mapIterator->next();
1196: my $foundJump = 0;
1197: my $counter = 0;
1198:
1199: while ($depth > 0 && !$foundJump) {
1200: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1201: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1202: if (ref($curRes)) { $counter++; }
1203:
1204: if (ref($curRes) && $jump eq $curRes->symb()) {
1205:
1206: # This is why we have to use the main iterator instead of the
1207: # potentially faster DFS: The count has to be the same, so
1208: # the order has to be the same, which DFS won't give us.
1209: $args->{'currentJumpIndex'} = $counter;
1210: $foundJump = 1;
1211: }
1212:
1213: $curRes = $mapIterator->next();
1214: }
1215:
1.132 bowersj2 1216: my $showParts = setDefault($args->{'showParts'}, 1);
1217: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139 bowersj2 1218: # keeps track of when the current resource is found,
1219: # so we can back up a few and put the anchor above the
1220: # current resource
1.140 bowersj2 1221: my $printKey = $args->{'printKey'};
1222: my $printCloseAll = $args->{'printCloseAll'};
1223: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.144 bowersj2 1224:
1.140 bowersj2 1225: # Print key?
1226: if ($printKey) {
1227: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1228: my $date=localtime;
1229: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1230: if ($navmap->{LAST_CHECK}) {
1231: $result .=
1232: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1233: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1234: '</td><td align="center" valign="bottom"> '.
1235: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1236: '</td>';
1237: } else {
1238: $result .= '<td align="center" valign="bottom"> '.
1239: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1240: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1241: '</td>';
1242: }
1243:
1244: $result .= '</tr></table>';
1245: }
1246:
1.172 bowersj2 1247: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.140 bowersj2 1248: if ($condition) {
1249: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1.158 bowersj2 1250: "&here=" . Apache::lonnet::escape($here) .
1.140 bowersj2 1251: "\">Close All Folders</a>";
1252: } else {
1253: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1.158 bowersj2 1254: "&here=" . Apache::lonnet::escape($here) .
1.140 bowersj2 1255: "\">Open All Folders</a>";
1256: }
1.143 bowersj2 1257: $result .= "<br /><br />\n";
1.140 bowersj2 1258: }
1259:
1260: if ($r) {
1261: $r->print($result);
1262: $r->rflush();
1263: $result = "";
1264: }
1.132 bowersj2 1265: # End parameter setting
1.133 bowersj2 1266:
1.132 bowersj2 1267: # Data
1.140 bowersj2 1268: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132 bowersj2 1269: my $res = "Apache::lonnavmaps::resource";
1270: my %condenseStatuses =
1271: ( $res->NETWORK_FAILURE => 1,
1272: $res->NOTHING_SET => 1,
1273: $res->CORRECT => 1 );
1274: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 1275:
1276: # Shared variables
1277: $args->{'counter'} = 0; # counts the rows
1278: $args->{'indentLevel'} = 0;
1279: $args->{'isNewBranch'} = 0;
1280: $args->{'condensed'} = 0;
1281: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1282: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 1283:
1.190 bowersj2 1284: # If we're suppressing empty sequences, look for them here. Use DFS for speed,
1285: # since structure actually doesn't matter, except what map has what resources.
1286: if ($args->{'suppressEmptySequences'}) {
1287: my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
1288: $it->{FIRST_RESOURCE},
1289: $it->{FINISH_RESOURCE},
1290: {}, undef, 1);
1291: $depth = 0;
1292: $dfsit->next();
1293: my $curRes = $dfsit->next();
1294: while ($depth > -1) {
1295: if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
1296: if ($curRes == $dfsit->END_MAP()) { $depth--; }
1297:
1298: if (ref($curRes)) {
1299: # Parallel pre-processing: Do sequences have non-filtered-out children?
1.201 bowersj2 1300: if ($curRes->is_map()) {
1.190 bowersj2 1301: $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
1302: # Sequences themselves do not count as visible children,
1303: # unless those sequences also have visible children.
1304: # This means if a sequence appears, there's a "promise"
1305: # that there's something under it if you open it, somewhere.
1306: } else {
1307: # Not a sequence: if it's filtered, ignore it, otherwise
1308: # rise up the stack and mark the sequences as having children
1309: if (&$filterFunc($curRes)) {
1310: for my $sequence (@{$dfsit->getStack()}) {
1311: $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
1312: }
1313: }
1314: }
1315: }
1316: } continue {
1317: $curRes = $dfsit->next();
1318: }
1319: }
1320:
1.133 bowersj2 1321: my $displayedJumpMarker = 0;
1.132 bowersj2 1322: # Set up iteration.
1.159 bowersj2 1323: $depth = 1;
1.132 bowersj2 1324: $it->next(); # discard initial BEGIN_MAP
1.159 bowersj2 1325: $curRes = $it->next();
1.132 bowersj2 1326: my $now = time();
1327: my $in24Hours = $now + 24 * 60 * 60;
1328: my $rownum = 0;
1329:
1.141 bowersj2 1330: # export "here" marker information
1331: $args->{'here'} = $here;
1332:
1.132 bowersj2 1333: while ($depth > 0) {
1334: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1335: if ($curRes == $it->END_MAP()) { $depth--; }
1336:
1337: # Maintain indentation level.
1338: if ($curRes == $it->BEGIN_MAP() ||
1339: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1340: $args->{'indentLevel'}++;
1.132 bowersj2 1341: }
1342: if ($curRes == $it->END_MAP() ||
1343: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1344: $args->{'indentLevel'}--;
1.132 bowersj2 1345: }
1346: # Notice new branches
1347: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1348: $args->{'isNewBranch'} = 1;
1349: }
1350:
1351: # If this isn't an actual resource, continue on
1352: if (!ref($curRes)) {
1353: next;
1.132 bowersj2 1354: }
1.133 bowersj2 1355:
1.143 bowersj2 1356: # If this has been filtered out, continue on
1357: if (!(&$filterFunc($curRes))) {
1358: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1359: next;
1360: }
1.132 bowersj2 1361:
1.190 bowersj2 1362: # If this is an empty sequence and we're filtering them, continue on
1.201 bowersj2 1363: if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
1.190 bowersj2 1364: !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
1365: next;
1366: }
1367:
1.153 bowersj2 1368: # If we're suppressing navmaps and this is a navmap, continue on
1369: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1370: next;
1371: }
1372:
1.191 bowersj2 1373: $args->{'counter'}++;
1374:
1.132 bowersj2 1375: # Does it have multiple parts?
1.133 bowersj2 1376: $args->{'multipart'} = 0;
1377: $args->{'condensed'} = 0;
1.132 bowersj2 1378: my @parts;
1379:
1380: # Decide what parts to show.
1.133 bowersj2 1381: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1382: @parts = @{$curRes->parts()};
1.192 bowersj2 1383: $args->{'multipart'} = $curRes->multipart();
1.132 bowersj2 1384:
1385: if ($condenseParts) { # do the condensation
1386: if (!$curRes->opendate("0")) {
1.162 bowersj2 1387: @parts = ();
1.133 bowersj2 1388: $args->{'condensed'} = 1;
1.132 bowersj2 1389: }
1.133 bowersj2 1390: if (!$args->{'condensed'}) {
1.132 bowersj2 1391: # Decide whether to condense based on similarity
1.192 bowersj2 1392: my $status = $curRes->status($parts[0]);
1393: my $due = $curRes->duedate($parts[0]);
1394: my $open = $curRes->opendate($parts[0]);
1.132 bowersj2 1395: my $statusAllSame = 1;
1396: my $dueAllSame = 1;
1397: my $openAllSame = 1;
1.192 bowersj2 1398: for (my $i = 1; $i < scalar(@parts); $i++) {
1.132 bowersj2 1399: if ($curRes->status($parts[$i]) != $status){
1400: $statusAllSame = 0;
1401: }
1402: if ($curRes->duedate($parts[$i]) != $due ) {
1403: $dueAllSame = 0;
1404: }
1405: if ($curRes->opendate($parts[$i]) != $open) {
1406: $openAllSame = 0;
1407: }
1408: }
1409: # $*allSame is true if all the statuses were
1410: # the same. Now, if they are all the same and
1411: # match one of the statuses to condense, or they
1412: # are all open with the same due date, or they are
1413: # all OPEN_LATER with the same open date, display the
1414: # status of the first non-zero part (to get the 'correct'
1415: # status right, since 0 is never 'correct' or 'open').
1416: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1417: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1418: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.192 bowersj2 1419: @parts = ($parts[0]);
1.133 bowersj2 1420: $args->{'condensed'} = 1;
1.132 bowersj2 1421: }
1422: }
1.198 bowersj2 1423: # Multipart problem with one part: always "condense" (happens
1424: # to match the desirable behavior)
1425: if ($curRes->countParts() == 1) {
1426: @parts = ($parts[0]);
1427: $args->{'condensed'} = 1;
1428: }
1.132 bowersj2 1429: }
1.157 bowersj2 1430: }
1.132 bowersj2 1431:
1432: # If the multipart problem was condensed, "forget" it was multipart
1433: if (scalar(@parts) == 1) {
1.133 bowersj2 1434: $args->{'multipart'} = 0;
1.192 bowersj2 1435: } else {
1436: # Add part 0 so we display it correctly.
1437: unshift @parts, '0';
1.132 bowersj2 1438: }
1439:
1440: # Now, we've decided what parts to show. Loop through them and
1441: # show them.
1.192 bowersj2 1442: foreach my $part (@parts) {
1.132 bowersj2 1443: $rownum ++;
1444: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1445:
1446: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1447:
1448: # Set up some data about the parts that the cols might want
1449: my $filter = $it->{FILTER};
1450: my $stack = $it->getStack();
1451: my $src = getLinkForResource($stack);
1452:
1453: my $srcHasQuestion = $src =~ /\?/;
1454: $args->{"resourceLink"} = $src.
1455: ($srcHasQuestion?'&':'?') .
1.137 bowersj2 1456: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1.132 bowersj2 1457:
1458: # Now, display each column.
1459: foreach my $col (@$cols) {
1.139 bowersj2 1460: my $colHTML = '';
1461: if (ref($col)) {
1462: $colHTML .= &$col($curRes, $part, $args);
1463: } else {
1464: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1465: }
1.132 bowersj2 1466:
1.133 bowersj2 1467: # If this is the first column and it's time to print
1468: # the anchor, do so
1469: if ($col == $cols->[0] &&
1470: $args->{'counter'} == $args->{'currentJumpIndex'} -
1.139 bowersj2 1471: $currentJumpDelta) {
1472: # Jam the anchor after the <td> tag;
1473: # necessary for valid HTML (which Mozilla requires)
1474: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133 bowersj2 1475: $displayedJumpMarker = 1;
1476: }
1.139 bowersj2 1477: $result .= $colHTML . "\n";
1.132 bowersj2 1478: }
1.139 bowersj2 1479: $result .= " </tr>\n";
1.140 bowersj2 1480: $args->{'isNewBranch'} = 0;
1.139 bowersj2 1481: }
1.153 bowersj2 1482:
1.139 bowersj2 1483: if ($r && $rownum % 20 == 0) {
1484: $r->print($result);
1485: $result = "";
1486: $r->rflush();
1.132 bowersj2 1487: }
1.156 bowersj2 1488: } continue {
1.132 bowersj2 1489: $curRes = $it->next();
1490: }
1491:
1.134 bowersj2 1492: # Print out the part that jumps to #curloc if it exists
1.159 bowersj2 1493: # delay needed because the browser is processing the jump before
1494: # it finishes rendering, so it goes to the wrong place!
1495: # onload might be better, but this routine has no access to that.
1496: # On mozilla, the 0-millisecond timeout seems to prevent this;
1497: # it's quite likely this might fix other browsers, too, and
1498: # certainly won't hurt anything.
1.139 bowersj2 1499: if ($displayedJumpMarker) {
1.159 bowersj2 1500: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1.134 bowersj2 1501: }
1502:
1.132 bowersj2 1503: $result .= "</table>";
1.140 bowersj2 1504:
1505: if ($r) {
1506: $r->print($result);
1507: $result = "";
1508: $r->rflush();
1509: }
1510:
1.175 bowersj2 1511: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1.132 bowersj2 1512:
1513: return $result;
1514: }
1515:
1.133 bowersj2 1516: 1;
1517:
1518: package Apache::lonnavmaps::navmap;
1519:
1520: =pod
1521:
1.174 albertel 1522: lonnavmaps provides functions and objects for dealing with the
1523: compiled course hashes generated when a user enters the course, the
1524: Apache handler for the "Navigation Map" button, and a flexible
1525: prepared renderer for navigation maps that are easy to use anywhere.
1526:
1527: =head1 Object: navmap
1.133 bowersj2 1528:
1.174 albertel 1529: Encapsulating the compiled nav map
1.133 bowersj2 1530:
1.174 albertel 1531: navmap is an object that encapsulates a compiled course map and
1532: provides a reasonable interface to it.
1.133 bowersj2 1533:
1.174 albertel 1534: Most notably it provides a way to navigate the map sensibly and a
1535: flexible iterator that makes it easy to write various renderers based
1536: on nav maps.
1.133 bowersj2 1537:
1538: You must obtain resource objects through the navmap object.
1539:
1540: =head2 Methods
1541:
1542: =over 4
1543:
1.174 albertel 1544: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1545: genMailDiscussStatus):
1.133 bowersj2 1546:
1.174 albertel 1547: Binds a new navmap object to the compiled nav map hash and parm hash
1548: given as filenames. genCourseAndUserOptions is a flag saying whether
1549: the course options and user options hash should be generated. This is
1550: for when you are using the parameters of the resources that require
1551: them; see documentation in resource object
1552: documentation. genMailDiscussStatus causes the nav map to retreive
1553: information about the email and discussion status of
1554: resources. Returns the navmap object if this is successful, or
1555: B<undef> if not. You must check for undef; errors will occur when you
1556: try to use the other methods otherwise.
1557:
1558: =item * B<getIterator>(first, finish, filter, condition):
1559:
1560: See iterator documentation below.
1.133 bowersj2 1561:
1562: =cut
1563:
1564: use strict;
1565: use GDBM_File;
1566:
1567: sub new {
1568: # magic invocation to create a class instance
1569: my $proto = shift;
1570: my $class = ref($proto) || $proto;
1571: my $self = {};
1572:
1573: $self->{NAV_HASH_FILE} = shift;
1574: $self->{PARM_HASH_FILE} = shift;
1575: $self->{GENERATE_COURSE_USER_OPT} = shift;
1576: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1577:
1578: # Resource cache stores navmap resources as we reference them. We generate
1579: # them on-demand so we don't pay for creating resources unless we use them.
1580: $self->{RESOURCE_CACHE} = {};
1581:
1582: # Network failure flag, if we accessed the course or user opt and
1583: # failed
1584: $self->{NETWORK_FAILURE} = 0;
1585:
1586: # tie the nav hash
1587:
1.168 bowersj2 1588: my %navmaphash;
1589: my %parmhash;
1590: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1.133 bowersj2 1591: &GDBM_READER(), 0640))) {
1592: return undef;
1593: }
1594:
1.168 bowersj2 1595: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1.133 bowersj2 1596: &GDBM_READER(), 0640)))
1597: {
1.170 matthew 1598: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1599: return undef;
1600: }
1601:
1.199 bowersj2 1602: $self->{NAV_HASH} = \%navmaphash;
1.168 bowersj2 1603: $self->{PARM_HASH} = \%parmhash;
1.140 bowersj2 1604: $self->{INITED} = 0;
1.133 bowersj2 1605:
1606: bless($self);
1607:
1608: return $self;
1609: }
1610:
1611: sub init {
1612: my $self = shift;
1.140 bowersj2 1613: if ($self->{INITED}) { return; }
1.133 bowersj2 1614:
1615: # If the course opt hash and the user opt hash should be generated,
1616: # generate them
1617: if ($self->{GENERATE_COURSE_USER_OPT}) {
1618: my $uname=$ENV{'user.name'};
1619: my $udom=$ENV{'user.domain'};
1620: my $uhome=$ENV{'user.home'};
1621: my $cid=$ENV{'request.course.id'};
1622: my $chome=$ENV{'course.'.$cid.'.home'};
1623: my ($cdom,$cnum)=split(/\_/,$cid);
1624:
1625: my $userprefix=$uname.'_'.$udom.'_';
1626:
1627: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1628: unless ($uhome eq 'no_host') {
1629: # ------------------------------------------------- Get coursedata (if present)
1630: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1631: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1632: ':resourcedata',$chome);
1.182 bowersj2 1633: # Check for network failure
1634: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1635: $self->{NETWORK_FAILURE} = 1;
1636: } elsif ($reply!~/^error\:/) {
1.133 bowersj2 1637: $courserdatas{$cid}=$reply;
1638: $courserdatas{$cid.'.last_cache'}=time;
1639: }
1640: }
1641: foreach (split(/\&/,$courserdatas{$cid})) {
1642: my ($name,$value)=split(/\=/,$_);
1643: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1644: &Apache::lonnet::unescape($value);
1645: }
1646: # --------------------------------------------------- Get userdata (if present)
1647: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1648: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1649: if ($reply!~/^error\:/) {
1650: $userrdatas{$uname.'___'.$udom}=$reply;
1651: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1652: }
1653: # check to see if network failed
1654: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1655: {
1656: $self->{NETWORK_FAILURE} = 1;
1657: }
1658: }
1659: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1660: my ($name,$value)=split(/\=/,$_);
1661: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1662: &Apache::lonnet::unescape($value);
1663: }
1664: $self->{COURSE_OPT} = \%courseopt;
1665: $self->{USER_OPT} = \%useropt;
1666: }
1667: }
1668:
1669: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1670: my $cid=$ENV{'request.course.id'};
1671: my ($cdom,$cnum)=split(/\_/,$cid);
1672:
1673: my %emailstatus = &Apache::lonnet::dump('email_status');
1674: my $logoutTime = $emailstatus{'logout'};
1675: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.193 bowersj2 1676: $self->{LAST_CHECK} = (($courseLeaveTime > $logoutTime) ?
1.133 bowersj2 1677: $courseLeaveTime : $logoutTime);
1678: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1679: $cdom, $cnum);
1680: my %feedback=();
1681: my %error=();
1682: my $keys = &Apache::lonnet::reply('keys:'.
1683: $ENV{'user.domain'}.':'.
1684: $ENV{'user.name'}.':nohist_email',
1685: $ENV{'user.home'});
1686:
1687: foreach my $msgid (split(/\&/, $keys)) {
1688: $msgid=&Apache::lonnet::unescape($msgid);
1689: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1690: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1691: my ($what,$url)=($1,$2);
1692: my %status=
1693: &Apache::lonnet::get('email_status',[$msgid]);
1694: if ($status{$msgid}=~/^error\:/) {
1695: $status{$msgid}='';
1696: }
1697:
1698: if (($status{$msgid} eq 'new') ||
1699: (!$status{$msgid})) {
1700: if ($what eq 'Error') {
1701: $error{$url}.=','.$msgid;
1702: } else {
1703: $feedback{$url}.=','.$msgid;
1704: }
1705: }
1706: }
1707: }
1708:
1709: $self->{FEEDBACK} = \%feedback;
1710: $self->{ERROR_MSG} = \%error; # what is this? JB
1711: $self->{DISCUSSION_TIME} = \%discussiontime;
1712: $self->{EMAIL_STATUS} = \%emailstatus;
1713:
1714: }
1715:
1716: $self->{PARM_CACHE} = {};
1.140 bowersj2 1717: $self->{INITED} = 1;
1.133 bowersj2 1718: }
1719:
1720: # Internal function: Takes a key to look up in the nav hash and implements internal
1721: # memory caching of that key.
1722: sub navhash {
1723: my $self = shift; my $key = shift;
1724: return $self->{NAV_HASH}->{$key};
1725: }
1726:
1727: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1728: sub courseMapDefined {
1729: my $self = shift;
1730: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1731:
1732: my $firstres = $self->navhash("map_start_$uri");
1733: my $lastres = $self->navhash("map_finish_$uri");
1734: return $firstres && $lastres;
1735: }
1736:
1737: sub getIterator {
1738: my $self = shift;
1739: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1740: shift, undef, shift);
1741: return $iterator;
1742: }
1743:
1744: # unties the hash when done
1745: sub untieHashes {
1.168 bowersj2 1746: my $self = shift;
1.170 matthew 1747: untie %{$self->{NAV_HASH}};
1748: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1749: }
1750:
1751: # Private method: Does the given resource (as a symb string) have
1752: # current discussion? Returns 0 if chat/mail data not extracted.
1753: sub hasDiscussion {
1754: my $self = shift;
1755: my $symb = shift;
1756: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1757:
1758: #return defined($self->{DISCUSSION_TIME}->{$symb});
1759: return $self->{DISCUSSION_TIME}->{$symb} >
1760: $self->{LAST_CHECK};
1761: }
1762:
1763: # Private method: Does the given resource (as a symb string) have
1764: # current feedback? Returns the string in the feedback hash, which
1765: # will be false if it does not exist.
1766: sub getFeedback {
1767: my $self = shift;
1768: my $symb = shift;
1769:
1770: if (!defined($self->{FEEDBACK})) { return ""; }
1771:
1772: return $self->{FEEDBACK}->{$symb};
1773: }
1774:
1775: # Private method: Get the errors for that resource (by source).
1776: sub getErrors {
1777: my $self = shift;
1778: my $src = shift;
1779:
1780: if (!defined($self->{ERROR_MSG})) { return ""; }
1781: return $self->{ERROR_MSG}->{$src};
1782: }
1783:
1784: =pod
1785:
1.174 albertel 1786: =item * B<getById>(id):
1787:
1788: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1789: object for that resource. This method, or other methods that use it
1790: (as in the resource object) is the only proper way to obtain a
1791: resource object.
1.133 bowersj2 1792:
1.194 bowersj2 1793: =item * B<getBySymb>(symb):
1794:
1795: Based on the symb of the resource, get a resource object for that
1796: resource. This is one of the proper ways to get a resource object.
1797:
1798: =item * B<getMapByMapPc>(map_pc):
1799:
1800: Based on the map_pc of the resource, get a resource object for
1801: the given map. This is one of the proper ways to get a resource object.
1802:
1.133 bowersj2 1803: =cut
1804:
1805: # The strategy here is to cache the resource objects, and only construct them
1806: # as we use them. The real point is to prevent reading any more from the tied
1807: # hash then we have to, which should hopefully alleviate speed problems.
1808: # Caching is just an incidental detail I throw in because it makes sense.
1809:
1810: sub getById {
1811: my $self = shift;
1812: my $id = shift;
1813:
1814: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1815: {
1816: return $self->{RESOURCE_CACHE}->{$id};
1817: }
1818:
1819: # resource handles inserting itself into cache.
1820: # Not clear why the quotes are necessary, but as of this
1821: # writing it doesn't work without them.
1822: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 1823: }
1.133 bowersj2 1824:
1.172 bowersj2 1825: sub getBySymb {
1826: my $self = shift;
1827: my $symb = shift;
1828: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1829: my $map = $self->getResourceByUrl($mapUrl);
1830: return $self->getById($map->map_pc() . '.' . $id);
1.194 bowersj2 1831: }
1832:
1833: sub getByMapPc {
1834: my $self = shift;
1835: my $map_pc = shift;
1836: my $map_id = $self->{NAV_HASH}->{'map_id_' . $map_pc};
1837: $map_id = $self->{NAV_HASH}->{'ids_' . $map_id};
1838: return $self->getById($map_id);
1.172 bowersj2 1839: }
1840:
1.133 bowersj2 1841: =pod
1842:
1.174 albertel 1843: =item * B<firstResource>():
1844:
1845: Returns a resource object reference corresponding to the first
1846: resource in the navmap.
1.133 bowersj2 1847:
1848: =cut
1849:
1850: sub firstResource {
1851: my $self = shift;
1852: my $firstResource = $self->navhash('map_start_' .
1853: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1854: return $self->getById($firstResource);
1.132 bowersj2 1855: }
1.133 bowersj2 1856:
1857: =pod
1858:
1.174 albertel 1859: =item * B<finishResource>():
1860:
1861: Returns a resource object reference corresponding to the last resource
1862: in the navmap.
1.133 bowersj2 1863:
1864: =cut
1865:
1866: sub finishResource {
1867: my $self = shift;
1868: my $firstResource = $self->navhash('map_finish_' .
1869: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1870: return $self->getById($firstResource);
1.132 bowersj2 1871: }
1.133 bowersj2 1872:
1873: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1874: # the actual lookup; parmval caches the results.
1875: sub parmval {
1876: my $self = shift;
1877: my ($what,$symb)=@_;
1878: my $hashkey = $what."|||".$symb;
1879:
1880: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1881: return $self->{PARM_CACHE}->{$hashkey};
1882: }
1883:
1884: my $result = $self->parmval_real($what, $symb);
1885: $self->{PARM_CACHE}->{$hashkey} = $result;
1886: return $result;
1.132 bowersj2 1887: }
1888:
1.133 bowersj2 1889: sub parmval_real {
1890: my $self = shift;
1891: my ($what,$symb) = @_;
1892:
1893: my $cid=$ENV{'request.course.id'};
1894: my $csec=$ENV{'request.course.sec'};
1895: my $uname=$ENV{'user.name'};
1896: my $udom=$ENV{'user.domain'};
1897:
1898: unless ($symb) { return ''; }
1899: my $result='';
1900:
1901: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1902:
1903: # ----------------------------------------------------- Cascading lookup scheme
1904: my $rwhat=$what;
1905: $what=~s/^parameter\_//;
1906: $what=~s/\_/\./;
1907:
1908: my $symbparm=$symb.'.'.$what;
1909: my $mapparm=$mapname.'___(all).'.$what;
1910: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1911:
1912: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1913: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1914: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1915:
1916: my $courselevel= $usercourseprefix.'.'.$what;
1917: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1918: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1919:
1920: my $useropt = $self->{USER_OPT};
1921: my $courseopt = $self->{COURSE_OPT};
1922: my $parmhash = $self->{PARM_HASH};
1923:
1924: # ---------------------------------------------------------- first, check user
1925: if ($uname and defined($useropt)) {
1926: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1927: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1928: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1929: }
1930:
1931: # ------------------------------------------------------- second, check course
1932: if ($csec and defined($courseopt)) {
1933: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1934: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1935: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1936: }
1937:
1938: if (defined($courseopt)) {
1939: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1940: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1941: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1942: }
1943:
1944: # ----------------------------------------------------- third, check map parms
1945:
1946: my $thisparm=$$parmhash{$symbparm};
1947: if (defined($thisparm)) { return $thisparm; }
1948:
1949: # ----------------------------------------------------- fourth , check default
1950:
1951: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1952: if (defined($default)) { return $default}
1953:
1954: # --------------------------------------------------- fifth , cascade up parts
1955:
1956: my ($space,@qualifier)=split(/\./,$rwhat);
1957: my $qualifier=join('.',@qualifier);
1958: unless ($space eq '0') {
1.160 albertel 1959: my @parts=split(/_/,$space);
1960: my $id=pop(@parts);
1961: my $part=join('_',@parts);
1962: if ($part eq '') { $part='0'; }
1963: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1964: if (defined($partgeneral)) { return $partgeneral; }
1.133 bowersj2 1965: }
1966: return '';
1.145 bowersj2 1967: }
1968:
1.174 albertel 1969: =pod
1.145 bowersj2 1970:
1.174 albertel 1971: =item * B<getResourceByUrl>(url):
1.145 bowersj2 1972:
1.174 albertel 1973: Retrieves a resource object by URL of the resource. If passed a
1974: resource object, it will simply return it, so it is safe to use this
1975: method in code like "$res = $navmap->getResourceByUrl($res)", if
1976: you're not sure if $res is already an object, or just a URL. If the
1977: resource appears multiple times in the course, only the first instance
1978: will be returned. As a result, this is probably useful only for maps.
1979:
1980: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
1981:
1982: The map is a specification of a map to retreive the resources from,
1983: either as a url or as an object. The filterFunc is a reference to a
1984: function that takes a resource object as its one argument and returns
1985: true if the resource should be included, or false if it should not
1986: be. If recursive is true, the map will be recursively examined,
1987: otherwise it will not be. If bailout is true, the function will return
1988: as soon as it finds a resource, if false it will finish. By default,
1989: the map is the top-level map of the course, filterFunc is a function
1990: that always returns 1, recursive is true, bailout is false. The
1991: resources will be returned in a list containing the resource objects
1992: for the corresponding resources, with B<no structure information> in
1993: the list; regardless of branching, recursion, etc., it will be a flat
1994: list.
1995:
1996: Thus, this is suitable for cases where you don't want the structure,
1997: just a list of all resources. It is also suitable for finding out how
1998: many resources match a given description; for this use, if all you
1999: want to know is if I<any> resources match the description, the bailout
2000: parameter will allow you to avoid potentially expensive enumeration of
2001: all matching resources.
1.145 bowersj2 2002:
1.174 albertel 2003: =item * B<hasResources>(map, filterFunc, recursive):
1.145 bowersj2 2004:
1.174 albertel 2005: Convience method for
1.146 bowersj2 2006:
2007: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
2008:
1.174 albertel 2009: which will tell whether the map has resources matching the description
2010: in the filter function.
1.146 bowersj2 2011:
1.145 bowersj2 2012: =cut
2013:
2014: sub getResourceByUrl {
2015: my $self = shift;
2016: my $resUrl = shift;
2017:
2018: if (ref($resUrl)) { return $resUrl; }
2019:
2020: $resUrl = &Apache::lonnet::clutter($resUrl);
2021: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
2022: if ($resId =~ /,/) {
2023: $resId = (split (/,/, $resId))[0];
2024: }
2025: if (!$resId) { return ''; }
2026: return $self->getById($resId);
2027: }
2028:
2029: sub retrieveResources {
2030: my $self = shift;
2031: my $map = shift;
2032: my $filterFunc = shift;
2033: if (!defined ($filterFunc)) {
2034: $filterFunc = sub {return 1;};
2035: }
2036: my $recursive = shift;
2037: if (!defined($recursive)) { $recursive = 1; }
2038: my $bailout = shift;
2039: if (!defined($bailout)) { $bailout = 0; }
2040:
2041: # Create the necessary iterator.
2042: if (!ref($map)) { # assume it's a url of a map.
1.172 bowersj2 2043: $map = $self->getResourceByUrl($map);
1.145 bowersj2 2044: }
2045:
2046: # Check the map's validity.
2047: if (!$map || !$map->is_map()) {
2048: # Oh, to throw an exception.... how I'd love that!
2049: return ();
2050: }
2051:
1.146 bowersj2 2052: # Get an iterator.
2053: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
2054: !$recursive);
2055:
2056: my @resources = ();
2057:
2058: # Run down the iterator and collect the resources.
2059: my $depth = 1;
2060: $it->next();
2061: my $curRes = $it->next();
2062:
2063: while ($depth > 0) {
2064: if ($curRes == $it->BEGIN_MAP()) {
2065: $depth++;
2066: }
2067: if ($curRes == $it->END_MAP()) {
2068: $depth--;
2069: }
2070:
2071: if (ref($curRes)) {
2072: if (!&$filterFunc($curRes)) {
2073: next;
2074: }
2075:
2076: push @resources, $curRes;
2077:
2078: if ($bailout) {
2079: return @resources;
2080: }
2081: }
2082:
2083: $curRes = $it->next();
2084: }
2085:
2086: return @resources;
2087: }
2088:
2089: sub hasResource {
2090: my $self = shift;
2091: my $map = shift;
2092: my $filterFunc = shift;
2093: my $recursive = shift;
2094:
2095: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133 bowersj2 2096: }
1.51 bowersj2 2097:
2098: 1;
2099:
2100: package Apache::lonnavmaps::iterator;
2101:
2102: =pod
2103:
2104: =back
2105:
1.174 albertel 2106: =head1 Object: navmap Iterator
1.51 bowersj2 2107:
1.174 albertel 2108: An I<iterator> encapsulates the logic required to traverse a data
2109: structure. navmap uses an iterator to traverse the course map
2110: according to the criteria you wish to use.
2111:
2112: To obtain an iterator, call the B<getIterator>() function of a
2113: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
2114: directly.) This will return a reference to the iterator:
1.51 bowersj2 2115:
2116: C<my $resourceIterator = $navmap-E<gt>getIterator();>
2117:
2118: To get the next thing from the iterator, call B<next>:
2119:
2120: C<my $nextThing = $resourceIterator-E<gt>next()>
2121:
2122: getIterator behaves as follows:
2123:
2124: =over 4
2125:
1.174 albertel 2126: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
2127:
2128: All parameters are optional. firstResource is a resource reference
2129: corresponding to where the iterator should start. It defaults to
2130: navmap->firstResource() for the corresponding nav map. finishResource
2131: corresponds to where you want the iterator to end, defaulting to
2132: navmap->finishResource(). filterHash is a hash used as a set
2133: containing strings representing the resource IDs, defaulting to
2134: empty. Condition is a 1 or 0 that sets what to do with the filter
2135: hash: If a 0, then only resource that exist IN the filterHash will be
2136: recursed on. If it is a 1, only resources NOT in the filterHash will
2137: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
2138: false (default), the iterator will only return the first level of map
2139: that is not just a single, 'redirecting' map. If true, the iterator
2140: will return all information, starting with the top-level map,
2141: regardless of content. returnTopMap, if true (default false), will
2142: cause the iterator to return the top-level map object (resource 0.0)
2143: before anything else.
2144:
2145: Thus, by default, only top-level resources will be shown. Change the
2146: condition to a 1 without changing the hash, and all resources will be
2147: shown. Changing the condition to 1 and including some values in the
2148: hash will allow you to selectively suppress parts of the navmap, while
2149: leaving it on 0 and adding things to the hash will allow you to
2150: selectively add parts of the nav map. See the handler code for
2151: examples.
2152:
2153: The iterator will return either a reference to a resource object, or a
2154: token representing something in the map, such as the beginning of a
2155: new branch. The possible tokens are:
2156:
2157: =over 4
1.51 bowersj2 2158:
1.174 albertel 2159: =item * BEGIN_MAP:
1.51 bowersj2 2160:
1.174 albertel 2161: A new map is being recursed into. This is returned I<after> the map
2162: resource itself is returned.
1.51 bowersj2 2163:
1.174 albertel 2164: =item * END_MAP:
2165:
2166: The map is now done.
1.51 bowersj2 2167:
1.174 albertel 2168: =item * BEGIN_BRANCH:
1.70 bowersj2 2169:
1.174 albertel 2170: A branch is now starting. The next resource returned will be the first
2171: in that branch.
1.70 bowersj2 2172:
1.174 albertel 2173: =item * END_BRANCH:
1.70 bowersj2 2174:
1.174 albertel 2175: The branch is now done.
1.51 bowersj2 2176:
2177: =back
2178:
1.174 albertel 2179: The tokens are retreivable via methods on the iterator object, i.e.,
2180: $iterator->END_MAP.
1.70 bowersj2 2181:
1.174 albertel 2182: Maps can contain empty resources. The iterator will automatically skip
2183: over such resources, but will still treat the structure
2184: correctly. Thus, a complicated map with several branches, but
2185: consisting entirely of empty resources except for one beginning or
2186: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2187: but only one resource will be returned.
1.116 bowersj2 2188:
1.70 bowersj2 2189: =back
1.51 bowersj2 2190:
2191: =cut
2192:
2193: # Here are the tokens for the iterator:
2194:
2195: sub BEGIN_MAP { return 1; } # begining of a new map
2196: sub END_MAP { return 2; } # end of the map
2197: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2198: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 2199: sub FORWARD { return 1; } # go forward
2200: sub BACKWARD { return 2; }
1.51 bowersj2 2201:
1.96 bowersj2 2202: sub min {
2203: (my $a, my $b) = @_;
2204: if ($a < $b) { return $a; } else { return $b; }
2205: }
2206:
1.107 bowersj2 2207: # In the CVS repository, documentation of this algorithm is included
2208: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
2209: # will reference the same location in the text as the part of the
2210: # algorithm is running through.
2211:
1.94 bowersj2 2212: sub new {
2213: # magic invocation to create a class instance
2214: my $proto = shift;
2215: my $class = ref($proto) || $proto;
2216: my $self = {};
2217:
2218: $self->{NAV_MAP} = shift;
2219: return undef unless ($self->{NAV_MAP});
2220:
2221: # Handle the parameters
2222: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2223: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2224:
2225: # If the given resources are just the ID of the resource, get the
2226: # objects
2227: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2228: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2229: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2230: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2231:
2232: $self->{FILTER} = shift;
2233:
2234: # A hash, used as a set, of resource already seen
2235: $self->{ALREADY_SEEN} = shift;
2236: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2237: $self->{CONDITION} = shift;
2238:
1.116 bowersj2 2239: # Do we want to automatically follow "redirection" maps?
2240: $self->{FORCE_TOP} = shift;
2241:
1.162 bowersj2 2242: # Do we want to return the top-level map object (resource 0.0)?
2243: $self->{RETURN_0} = shift;
2244: # have we done that yet?
2245: $self->{HAVE_RETURNED_0} = 0;
2246:
1.94 bowersj2 2247: # Now, we need to pre-process the map, by walking forward and backward
2248: # over the parts of the map we're going to look at.
1.96 bowersj2 2249:
1.97 bowersj2 2250: # The processing steps are exactly the same, except for a few small
2251: # changes, so I bundle those up in the following list of two elements:
2252: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2253: # first_resource).
2254: # This prevents writing nearly-identical code twice.
2255: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2256: 'FIRST_RESOURCE'],
2257: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2258: 'FINISH_RESOURCE'] );
2259:
1.98 bowersj2 2260: my $maxDepth = 0; # tracks max depth
2261:
1.116 bowersj2 2262: # If there is only one resource in this map, and it's a map, we
2263: # want to remember that, so the user can ask for the first map
2264: # that isn't just a redirector.
2265: my $resource; my $resourceCount = 0;
2266:
1.107 bowersj2 2267: # **1**
2268:
1.97 bowersj2 2269: foreach my $pass (@iterations) {
2270: my $direction = $pass->[0];
2271: my $valName = $pass->[1];
2272: my $nextResourceMethod = $pass->[2];
2273: my $firstResourceName = $pass->[3];
2274:
2275: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2276: $self->{FIRST_RESOURCE},
2277: $self->{FINISH_RESOURCE},
2278: {}, undef, 0, $direction);
1.96 bowersj2 2279:
1.97 bowersj2 2280: # prime the recursion
2281: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 2282: my $depth = 0;
1.97 bowersj2 2283: $iterator->next();
2284: my $curRes = $iterator->next();
1.98 bowersj2 2285: while ($depth > -1) {
1.97 bowersj2 2286: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2287: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 2288:
1.97 bowersj2 2289: if (ref($curRes)) {
1.116 bowersj2 2290: # If there's only one resource, this will save it
1.117 bowersj2 2291: # we have to filter empty resources from consideration here,
2292: # or even "empty", redirecting maps have two (start & finish)
2293: # or three (start, finish, plus redirector)
2294: if($direction == FORWARD && $curRes->src()) {
2295: $resource = $curRes; $resourceCount++;
2296: }
1.97 bowersj2 2297: my $resultingVal = $curRes->{DATA}->{$valName};
2298: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 2299: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 2300:
1.116 bowersj2 2301: if ($nextCount == 1) { # **3**
1.97 bowersj2 2302: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2303: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2304: }
2305:
1.116 bowersj2 2306: if ($nextCount > 1) { # **4**
1.97 bowersj2 2307: foreach my $res (@{$nextResources}) {
2308: my $current = $res->{DATA}->{$valName} || 999999999;
2309: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2310: }
2311: }
2312: }
1.96 bowersj2 2313:
1.107 bowersj2 2314: # Assign the final val (**2**)
1.97 bowersj2 2315: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 2316: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2317: $curRes->{DATA}->{BOT_UP_VAL});
2318:
2319: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2320: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1.190 bowersj2 2321: }
2322: } continue {
1.97 bowersj2 2323: $curRes = $iterator->next();
1.96 bowersj2 2324: }
2325: }
1.94 bowersj2 2326:
1.116 bowersj2 2327: # Check: Was this only one resource, a map?
2328: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2329: my $firstResource = $resource->map_start();
2330: my $finishResource = $resource->map_finish();
2331: return
2332: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2333: $finishResource, $self->{FILTER},
2334: $self->{ALREADY_SEEN},
2335: $self->{CONDITION}, 0);
2336:
2337: }
2338:
1.98 bowersj2 2339: # Set up some bookkeeping information.
2340: $self->{CURRENT_DEPTH} = 0;
2341: $self->{MAX_DEPTH} = $maxDepth;
2342: $self->{STACK} = [];
2343: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2344:
2345: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2346: push @{$self->{STACK}}, [];
2347: }
2348:
1.107 bowersj2 2349: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 2350: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2351: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2352:
2353: bless ($self);
2354:
2355: return $self;
2356: }
2357:
2358: sub next {
2359: my $self = shift;
1.162 bowersj2 2360:
2361: # If we want to return the top-level map object, and haven't yet,
2362: # do so.
2363: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2364: $self->{HAVE_RETURNED_0} = 1;
2365: return $self->{NAV_MAP}->getById('0.0');
2366: }
1.98 bowersj2 2367:
2368: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2369: # grab the next from the recursive iterator
2370: my $next = $self->{RECURSIVE_ITERATOR}->next();
2371:
2372: # is it a begin or end map? If so, update the depth
2373: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2374: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2375:
2376: # Are we back at depth 0? If so, stop recursing
2377: if ($self->{RECURSIVE_DEPTH} == 0) {
2378: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2379: }
2380:
2381: return $next;
2382: }
2383:
2384: if (defined($self->{FORCE_NEXT})) {
2385: my $tmp = $self->{FORCE_NEXT};
2386: $self->{FORCE_NEXT} = undef;
2387: return $tmp;
2388: }
2389:
2390: # Have we not yet begun? If not, return BEGIN_MAP and
2391: # remember we've started.
2392: if ( !$self->{STARTED} ) {
2393: $self->{STARTED} = 1;
2394: return $self->BEGIN_MAP();
2395: }
2396:
2397: # Here's the guts of the iterator.
2398:
2399: # Find the next resource, if any.
2400: my $found = 0;
2401: my $i = $self->{MAX_DEPTH};
2402: my $newDepth;
2403: my $here;
2404: while ( $i >= 0 && !$found ) {
1.107 bowersj2 2405: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2406: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 2407: $found = 1;
2408: $newDepth = $i;
2409: }
2410: $i--;
2411: }
2412:
2413: # If we still didn't find anything, we're done.
2414: if ( !$found ) {
2415: # We need to get back down to the correct branch depth
2416: if ( $self->{CURRENT_DEPTH} > 0 ) {
2417: $self->{CURRENT_DEPTH}--;
2418: return END_BRANCH();
2419: } else {
2420: return END_MAP();
2421: }
2422: }
2423:
1.104 bowersj2 2424: # If this is not a resource, it must be an END_BRANCH marker we want
2425: # to return directly.
1.107 bowersj2 2426: if (!ref($here)) { # **8**
1.104 bowersj2 2427: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2428: $self->{CURRENT_DEPTH}--;
2429: return $here;
2430: }
2431: }
2432:
2433: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2434: $self->{HERE} = $here;
2435:
1.98 bowersj2 2436: # Get to the right level
2437: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2438: push @{$self->{STACK}->[$newDepth]}, $here;
2439: $self->{CURRENT_DEPTH}--;
2440: return END_BRANCH();
2441: }
2442: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2443: push @{$self->{STACK}->[$newDepth]}, $here;
2444: $self->{CURRENT_DEPTH}++;
2445: return BEGIN_BRANCH();
2446: }
2447:
2448: # If we made it here, we have the next resource, and we're at the
2449: # right branch level. So let's examine the resource for where
2450: # we can get to from here.
2451:
2452: # So we need to look at all the resources we can get to from here,
2453: # categorize them if we haven't seen them, remember if we have a new
2454: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 2455: my $maxDepthAdded = -1;
2456:
1.98 bowersj2 2457: for (@$nextUnfiltered) {
2458: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 2459: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2460: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 2461: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 2462: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 2463: }
2464: }
1.104 bowersj2 2465:
2466: # Is this the end of a branch? If so, all of the resources examined above
2467: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2468: # marker onto the stack so we don't forget.
2469: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2470: # BC branch and gets to C, it will see F as the only next resource, but it's
2471: # one level lower. Thus, this is the end of the branch, since there are no
2472: # more resources added to this level or above.
1.111 bowersj2 2473: # We don't do this if the examined resource is the finish resource,
2474: # because the condition given above is true, but the "END_MAP" will
2475: # take care of things and we should already be at depth 0.
1.104 bowersj2 2476: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 2477: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 2478: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2479: }
2480:
1.98 bowersj2 2481: # That ends the main iterator logic. Now, do we want to recurse
2482: # down this map (if this resource is a map)?
2483: if ($self->{HERE}->is_map() &&
2484: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2485: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2486: my $firstResource = $self->{HERE}->map_start();
2487: my $finishResource = $self->{HERE}->map_finish();
2488:
2489: $self->{RECURSIVE_ITERATOR} =
2490: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2491: $finishResource, $self->{FILTER},
2492: $self->{ALREADY_SEEN}, $self->{CONDITION});
2493: }
2494:
1.116 bowersj2 2495: # If this is a blank resource, don't actually return it.
1.117 bowersj2 2496: # Should you ever find you need it, make sure to add an option to the code
2497: # that you can use; other things depend on this behavior.
1.138 bowersj2 2498: my $browsePriv = $self->{HERE}->browsePriv();
2499: if (!$self->{HERE}->src() ||
2500: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.116 bowersj2 2501: return $self->next();
2502: }
2503:
1.98 bowersj2 2504: return $self->{HERE};
2505:
2506: }
2507:
2508: =pod
2509:
1.174 albertel 2510: The other method available on the iterator is B<getStack>, which
2511: returns an array populated with the current 'stack' of maps, as
2512: references to the resource objects. Example: This is useful when
2513: making the navigation map, as we need to check whether we are under a
2514: page map to see if we need to link directly to the resource, or to the
2515: page. The first elements in the array will correspond to the top of
2516: the stack (most inclusive map).
1.98 bowersj2 2517:
2518: =cut
2519:
2520: sub getStack {
2521: my $self=shift;
2522:
2523: my @stack;
2524:
2525: $self->populateStack(\@stack);
2526:
2527: return \@stack;
2528: }
2529:
2530: # Private method: Calls the iterators recursively to populate the stack.
2531: sub populateStack {
2532: my $self=shift;
2533: my $stack = shift;
2534:
2535: push @$stack, $self->{HERE} if ($self->{HERE});
2536:
2537: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2538: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2539: }
1.94 bowersj2 2540: }
2541:
2542: 1;
2543:
2544: package Apache::lonnavmaps::DFSiterator;
2545:
1.100 bowersj2 2546: # Not documented in the perldoc: This is a simple iterator that just walks
2547: # through the nav map and presents the resources in a depth-first search
2548: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2549: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2550: # useful for pre-processing of some kind, and is in fact used by the main
2551: # iterator that way, but that's about it.
2552: # One could imagine merging this into the init routine of the main iterator,
2553: # but this might as well be left seperate, since it is possible some other
2554: # use might be found for it. - Jeremy
1.94 bowersj2 2555:
1.117 bowersj2 2556: # Unlike the main iterator, this DOES return all resources, even blank ones.
2557: # The main iterator needs them to correctly preprocess the map.
2558:
1.94 bowersj2 2559: sub BEGIN_MAP { return 1; } # begining of a new map
2560: sub END_MAP { return 2; } # end of the map
2561: sub FORWARD { return 1; } # go forward
2562: sub BACKWARD { return 2; }
2563:
1.100 bowersj2 2564: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2565: # filter hash ref (or undef), already seen hash or undef, condition
2566: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 2567: sub new {
2568: # magic invocation to create a class instance
2569: my $proto = shift;
2570: my $class = ref($proto) || $proto;
2571: my $self = {};
2572:
2573: $self->{NAV_MAP} = shift;
2574: return undef unless ($self->{NAV_MAP});
2575:
2576: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2577: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2578:
2579: # If the given resources are just the ID of the resource, get the
2580: # objects
2581: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2582: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2583: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2584: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2585:
2586: $self->{FILTER} = shift;
2587:
2588: # A hash, used as a set, of resource already seen
2589: $self->{ALREADY_SEEN} = shift;
1.140 bowersj2 2590: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2591: $self->{CONDITION} = shift;
1.89 bowersj2 2592: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2593:
1.100 bowersj2 2594: # Flag: Have we started yet?
1.51 bowersj2 2595: $self->{STARTED} = 0;
2596:
2597: # Should we continue calling the recursive iterator, if any?
2598: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2599: # The recursive iterator, if any
2600: $self->{RECURSIVE_ITERATOR} = undef;
2601: # Are we recursing on a map, or a branch?
2602: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2603: # And the count of how deep it is, so that this iterator can keep track of
2604: # when to pick back up again.
2605: $self->{RECURSIVE_DEPTH} = 0;
2606:
2607: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2608: $self->{STACK} = [];
1.51 bowersj2 2609:
2610: # Start with the first resource
1.89 bowersj2 2611: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2612: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2613: } else {
1.100 bowersj2 2614: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2615: }
1.51 bowersj2 2616:
2617: bless($self);
2618: return $self;
2619: }
2620:
2621: sub next {
2622: my $self = shift;
2623:
2624: # Are we using a recursive iterator? If so, pull from that and
2625: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2626: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2627: # grab the next from the recursive iterator
2628: my $next = $self->{RECURSIVE_ITERATOR}->next();
2629:
2630: # is it a begin or end map? Update depth if so
2631: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2632: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2633:
2634: # Are we back at depth 0? If so, stop recursing.
2635: if ($self->{RECURSIVE_DEPTH} == 0) {
2636: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2637: }
2638:
2639: return $next;
2640: }
2641:
2642: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2643: # END_MAP, which will end the iterator.
2644: if (scalar(@{$self->{STACK}}) == 0) {
2645: return $self->END_MAP();
1.51 bowersj2 2646: }
2647:
2648: # Have we not yet begun? If not, return BEGIN_MAP and
2649: # remember that we've started.
2650: if ( !$self->{STARTED} ) {
2651: $self->{STARTED} = 1;
2652: return $self->BEGIN_MAP;
2653: }
2654:
2655: # Get the next resource in the branch
1.100 bowersj2 2656: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2657:
1.100 bowersj2 2658: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2659: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2660:
2661: # Get the next possible resources
1.90 bowersj2 2662: my $nextUnfiltered;
1.89 bowersj2 2663: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2664: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2665: } else {
1.90 bowersj2 2666: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2667: }
1.51 bowersj2 2668: my $next = [];
2669:
2670: # filter the next possibilities to remove things we've
1.100 bowersj2 2671: # already seen.
1.51 bowersj2 2672: foreach (@$nextUnfiltered) {
1.52 bowersj2 2673: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2674: push @$next, $_;
2675: }
1.51 bowersj2 2676: }
2677:
2678: while (@$next) {
1.100 bowersj2 2679: # copy the next possibilities over to the stack
2680: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2681: }
2682:
2683: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2684: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2685: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2686: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2687: my $firstResource = $self->{HERE}->map_start();
2688: my $finishResource = $self->{HERE}->map_finish();
2689:
2690: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2691: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2692: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2693: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2694: }
2695:
2696: return $self->{HERE};
1.190 bowersj2 2697: }
2698:
2699: # Identical to the full iterator methods of the same name. Hate to copy/paste
2700: # but I also hate to "inherit" either iterator from the other.
2701:
2702: sub getStack {
2703: my $self=shift;
2704:
2705: my @stack;
2706:
2707: $self->populateStack(\@stack);
2708:
2709: return \@stack;
2710: }
2711:
2712: # Private method: Calls the iterators recursively to populate the stack.
2713: sub populateStack {
2714: my $self=shift;
2715: my $stack = shift;
2716:
2717: push @$stack, $self->{HERE} if ($self->{HERE});
2718:
2719: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2720: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2721: }
1.51 bowersj2 2722: }
2723:
1.1 www 2724: 1;
1.2 www 2725:
1.51 bowersj2 2726: package Apache::lonnavmaps::resource;
2727:
2728: use Apache::lonnet;
2729:
2730: =pod
2731:
2732: =head1 Object: resource
2733:
1.174 albertel 2734: A resource object encapsulates a resource in a resource map, allowing
2735: easy manipulation of the resource, querying the properties of the
2736: resource (including user properties), and represents a reference that
2737: can be used as the canonical representation of the resource by
2738: lonnavmap clients like renderers.
2739:
2740: A resource only makes sense in the context of a navmap, as some of the
2741: data is stored in the navmap object.
2742:
2743: You will probably never need to instantiate this object directly. Use
2744: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2745: starting resource.
1.51 bowersj2 2746:
1.188 bowersj2 2747: Resource objects respect the parameter_hiddenparts, which suppresses
2748: various parts according to the wishes of the map author. As of this
2749: writing, there is no way to override this parameter, and suppressed
2750: parts will never be returned, nor will their response types or ids be
2751: stored.
2752:
1.51 bowersj2 2753: =head2 Public Members
2754:
1.174 albertel 2755: resource objects have a hash called DATA ($resourceRef->{DATA}) that
2756: you can store whatever you want in. This allows you to easily do
2757: two-pass algorithms without worrying about managing your own
2758: resource->data hash.
1.51 bowersj2 2759:
2760: =head2 Methods
2761:
2762: =over 4
2763:
1.174 albertel 2764: =item * B<new>($navmapRef, $idString):
2765:
2766: The first arg is a reference to the parent navmap object. The second
2767: is the idString of the resource itself. Very rarely, if ever, called
2768: directly. Use the nav map->getByID() method.
1.70 bowersj2 2769:
2770: =back
1.51 bowersj2 2771:
2772: =cut
2773:
2774: sub new {
2775: # magic invocation to create a class instance
2776: my $proto = shift;
2777: my $class = ref($proto) || $proto;
2778: my $self = {};
2779:
2780: $self->{NAV_MAP} = shift;
2781: $self->{ID} = shift;
2782:
2783: # Store this new resource in the parent nav map's cache.
2784: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 2785: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 2786:
2787: # A hash that can be used by two-pass algorithms to store data
2788: # about this resource in. Not used by the resource object
2789: # directly.
2790: $self->{DATA} = {};
2791:
2792: bless($self);
2793:
2794: return $self;
2795: }
2796:
1.70 bowersj2 2797: # private function: simplify the NAV_HASH lookups we keep doing
2798: # pass the name, and to automatically append my ID, pass a true val on the
2799: # second param
2800: sub navHash {
2801: my $self = shift;
2802: my $param = shift;
2803: my $id = shift;
1.115 bowersj2 2804: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 2805: }
2806:
1.51 bowersj2 2807: =pod
2808:
1.70 bowersj2 2809: B<Metadata Retreival>
2810:
1.174 albertel 2811: These are methods that help you retrieve metadata about the resource:
2812: Method names are based on the fields in the compiled course
2813: representation.
1.70 bowersj2 2814:
2815: =over 4
2816:
1.174 albertel 2817: =item * B<compTitle>:
2818:
2819: Returns a "composite title", that is equal to $res->title() if the
2820: resource has a title, and is otherwise the last part of the URL (e.g.,
2821: "problem.problem").
2822:
2823: =item * B<ext>:
2824:
2825: Returns true if the resource is external.
2826:
2827: =item * B<goesto>:
2828:
2829: Returns the "goesto" value from the compiled nav map. (It is likely
2830: you want to use B<getNext> instead.)
2831:
2832: =item * B<kind>:
2833:
2834: Returns the kind of the resource from the compiled nav map.
2835:
2836: =item * B<randomout>:
1.106 bowersj2 2837:
1.174 albertel 2838: Returns true if this resource was chosen to NOT be shown to the user
2839: by the random map selection feature. In other words, this is usually
2840: false.
1.70 bowersj2 2841:
1.174 albertel 2842: =item * B<randompick>:
1.70 bowersj2 2843:
1.174 albertel 2844: Returns true for a map if the randompick feature is being used on the
2845: map. (?)
1.70 bowersj2 2846:
1.174 albertel 2847: =item * B<src>:
1.51 bowersj2 2848:
1.174 albertel 2849: Returns the source for the resource.
1.70 bowersj2 2850:
1.174 albertel 2851: =item * B<symb>:
1.70 bowersj2 2852:
1.174 albertel 2853: Returns the symb for the resource.
1.70 bowersj2 2854:
1.174 albertel 2855: =item * B<title>:
1.70 bowersj2 2856:
1.174 albertel 2857: Returns the title of the resource.
2858:
2859: =item * B<to>:
2860:
2861: Returns the "to" value from the compiled nav map. (It is likely you
2862: want to use B<getNext> instead.)
1.51 bowersj2 2863:
2864: =back
2865:
2866: =cut
2867:
2868: # These info functions can be used directly, as they don't return
2869: # resource information.
1.85 bowersj2 2870: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 2871: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 2872: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 2873: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2874: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 2875: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2876: sub randompick {
2877: my $self = shift;
2878: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2879: '.0.parameter_randompick'};
2880: }
1.51 bowersj2 2881: sub src {
2882: my $self=shift;
2883: return $self->navHash("src_", 1);
2884: }
2885: sub symb {
2886: my $self=shift;
2887: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2888: my $symbSrc = &Apache::lonnet::declutter($self->src());
2889: return &Apache::lonnet::declutter(
2890: $self->navHash('map_id_'.$first))
2891: . '___' . $second . '___' . $symbSrc;
2892: }
1.70 bowersj2 2893: sub title { my $self=shift; return $self->navHash("title_", 1); }
2894: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 2895: sub compTitle {
2896: my $self = shift;
2897: my $title = $self->title();
1.176 www 2898: $title=~s/\&colon\;/\:/gs;
1.106 bowersj2 2899: if (!$title) {
2900: $title = $self->src();
2901: $title = substr($title, rindex($title, '/') + 1);
2902: }
2903: return $title;
2904: }
1.70 bowersj2 2905: =pod
2906:
2907: B<Predicate Testing the Resource>
2908:
2909: These methods are shortcuts to deciding if a given resource has a given property.
2910:
2911: =over 4
2912:
1.174 albertel 2913: =item * B<is_map>:
2914:
2915: Returns true if the resource is a map type.
2916:
2917: =item * B<is_problem>:
1.70 bowersj2 2918:
1.174 albertel 2919: Returns true if the resource is a problem type, false
2920: otherwise. (Looks at the extension on the src field; might need more
2921: to work correctly.)
1.70 bowersj2 2922:
1.174 albertel 2923: =item * B<is_page>:
1.70 bowersj2 2924:
1.174 albertel 2925: Returns true if the resource is a page.
2926:
2927: =item * B<is_sequence>:
2928:
2929: Returns true if the resource is a sequence.
1.70 bowersj2 2930:
2931: =back
2932:
2933: =cut
2934:
2935:
2936: sub is_html {
1.51 bowersj2 2937: my $self=shift;
2938: my $src = $self->src();
1.70 bowersj2 2939: return ($src =~ /html$/);
1.51 bowersj2 2940: }
1.70 bowersj2 2941: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2942: sub is_page {
1.51 bowersj2 2943: my $self=shift;
2944: my $src = $self->src();
1.70 bowersj2 2945: return ($src =~ /page$/);
1.51 bowersj2 2946: }
1.70 bowersj2 2947: sub is_problem {
1.51 bowersj2 2948: my $self=shift;
2949: my $src = $self->src();
1.70 bowersj2 2950: return ($src =~ /problem$/);
1.51 bowersj2 2951: }
1.70 bowersj2 2952: sub is_sequence {
1.51 bowersj2 2953: my $self=shift;
2954: my $src = $self->src();
1.70 bowersj2 2955: return ($src =~ /sequence$/);
1.51 bowersj2 2956: }
2957:
1.101 bowersj2 2958: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2959: sub parmval {
2960: my $self = shift;
2961: my $what = shift;
1.185 bowersj2 2962: my $part = shift;
2963: if (!defined($part)) {
2964: $part = '0';
2965: }
1.51 bowersj2 2966: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2967: }
2968:
1.70 bowersj2 2969: =pod
2970:
2971: B<Map Methods>
2972:
1.174 albertel 2973: These methods are useful for getting information about the map
2974: properties of the resource, if the resource is a map (B<is_map>).
1.70 bowersj2 2975:
2976: =over 4
2977:
1.174 albertel 2978: =item * B<map_finish>:
2979:
2980: Returns a reference to a resource object corresponding to the finish
2981: resource of the map.
1.70 bowersj2 2982:
1.174 albertel 2983: =item * B<map_pc>:
1.70 bowersj2 2984:
1.174 albertel 2985: Returns the pc value of the map, which is the first number that
2986: appears in the resource ID of the resources in the map, and is the
2987: number that appears around the middle of the symbs of the resources in
2988: that map.
1.70 bowersj2 2989:
1.174 albertel 2990: =item * B<map_start>:
2991:
2992: Returns a reference to a resource object corresponding to the start
2993: resource of the map.
2994:
2995: =item * B<map_type>:
2996:
2997: Returns a string with the type of the map in it.
1.70 bowersj2 2998:
2999: =back
1.51 bowersj2 3000:
1.70 bowersj2 3001: =cut
1.51 bowersj2 3002:
3003: sub map_finish {
3004: my $self = shift;
3005: my $src = $self->src();
1.144 bowersj2 3006: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 3007: my $res = $self->navHash("map_finish_$src", 0);
3008: $res = $self->{NAV_MAP}->getById($res);
3009: return $res;
3010: }
1.70 bowersj2 3011: sub map_pc {
3012: my $self = shift;
3013: my $src = $self->src();
3014: return $self->navHash("map_pc_$src", 0);
3015: }
1.51 bowersj2 3016: sub map_start {
3017: my $self = shift;
3018: my $src = $self->src();
1.144 bowersj2 3019: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 3020: my $res = $self->navHash("map_start_$src", 0);
3021: $res = $self->{NAV_MAP}->getById($res);
3022: return $res;
3023: }
3024: sub map_type {
3025: my $self = shift;
3026: my $pc = $self->map_pc();
3027: return $self->navHash("map_type_$pc", 0);
3028: }
3029:
3030:
3031:
3032: #####
3033: # Property queries
3034: #####
3035:
3036: # These functions will be responsible for returning the CORRECT
3037: # VALUE for the parameter, no matter what. So while they may look
3038: # like direct calls to parmval, they can be more then that.
3039: # So, for instance, the duedate function should use the "duedatetype"
3040: # information, rather then the resource object user.
3041:
3042: =pod
3043:
3044: =head2 Resource Parameters
3045:
1.174 albertel 3046: In order to use the resource parameters correctly, the nav map must
3047: have been instantiated with genCourseAndUserOptions set to true, so
3048: the courseopt and useropt is read correctly. Then, you can call these
3049: functions to get the relevant parameters for the resource. Each
3050: function defaults to part "0", but can be directed to another part by
3051: passing the part as the parameter.
3052:
3053: These methods are responsible for getting the parameter correct, not
3054: merely reflecting the contents of the GDBM hashes. As we move towards
3055: dates relative to other dates, these methods should be updated to
3056: reflect that. (Then, anybody using these methods will not have to update
3057: their code.)
3058:
3059: =over 4
3060:
3061: =item * B<acc>:
3062:
3063: Get the Client IP/Name Access Control information.
1.51 bowersj2 3064:
1.174 albertel 3065: =item * B<answerdate>:
1.51 bowersj2 3066:
1.174 albertel 3067: Get the answer-reveal date for the problem.
3068:
3069: =item * B<duedate>:
3070:
3071: Get the due date for the problem.
3072:
3073: =item * B<tries>:
3074:
3075: Get the number of tries the student has used on the problem.
3076:
3077: =item * B<maxtries>:
3078:
3079: Get the number of max tries allowed.
3080:
3081: =item * B<opendate>:
1.51 bowersj2 3082:
1.174 albertel 3083: Get the open date for the problem.
1.51 bowersj2 3084:
1.174 albertel 3085: =item * B<sig>:
1.51 bowersj2 3086:
1.174 albertel 3087: Get the significant figures setting.
1.51 bowersj2 3088:
1.174 albertel 3089: =item * B<tol>:
1.51 bowersj2 3090:
1.174 albertel 3091: Get the tolerance for the problem.
1.51 bowersj2 3092:
1.174 albertel 3093: =item * B<tries>:
1.51 bowersj2 3094:
1.174 albertel 3095: Get the number of tries the user has already used on the problem.
1.51 bowersj2 3096:
1.174 albertel 3097: =item * B<type>:
1.51 bowersj2 3098:
1.174 albertel 3099: Get the question type for the problem.
1.70 bowersj2 3100:
1.174 albertel 3101: =item * B<weight>:
1.51 bowersj2 3102:
1.174 albertel 3103: Get the weight for the problem.
1.51 bowersj2 3104:
3105: =back
3106:
3107: =cut
3108:
3109: sub acc {
3110: (my $self, my $part) = @_;
3111: return $self->parmval("acc", $part);
3112: }
3113: sub answerdate {
3114: (my $self, my $part) = @_;
3115: # Handle intervals
3116: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
3117: return $self->duedate($part) +
3118: $self->parmval("answerdate", $part);
3119: }
3120: return $self->parmval("answerdate", $part);
1.106 bowersj2 3121: }
1.108 bowersj2 3122: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 3123: sub duedate {
3124: (my $self, my $part) = @_;
3125: return $self->parmval("duedate", $part);
3126: }
3127: sub maxtries {
3128: (my $self, my $part) = @_;
3129: return $self->parmval("maxtries", $part);
3130: }
3131: sub opendate {
3132: (my $self, my $part) = @_;
3133: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
3134: return $self->duedate($part) -
3135: $self->parmval("opendate", $part);
3136: }
3137: return $self->parmval("opendate");
3138: }
1.185 bowersj2 3139: sub problemstatus {
3140: (my $self, my $part) = @_;
3141: return $self->parmval("problemstatus", $part);
3142: }
1.51 bowersj2 3143: sub sig {
3144: (my $self, my $part) = @_;
3145: return $self->parmval("sig", $part);
3146: }
3147: sub tol {
3148: (my $self, my $part) = @_;
3149: return $self->parmval("tol", $part);
3150: }
1.108 bowersj2 3151: sub tries {
3152: my $self = shift;
3153: my $tries = $self->queryRestoreHash('tries', shift);
3154: if (!defined($tries)) { return '0';}
1.51 bowersj2 3155: return $tries;
3156: }
1.70 bowersj2 3157: sub type {
3158: (my $self, my $part) = @_;
3159: return $self->parmval("type", $part);
3160: }
1.109 bowersj2 3161: sub weight {
3162: my $self = shift; my $part = shift;
1.70 bowersj2 3163: return $self->parmval("weight", $part);
3164: }
1.51 bowersj2 3165:
3166: # Multiple things need this
3167: sub getReturnHash {
3168: my $self = shift;
3169:
3170: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 3171: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 3172: $self->{RETURN_HASH} = \%tmpHash;
3173: }
3174: }
3175:
3176: ######
3177: # Status queries
3178: ######
3179:
3180: # These methods query the status of problems.
3181:
3182: # If we need to count parts, this function determines the number of
3183: # parts from the metadata. When called, it returns a reference to a list
3184: # of strings corresponding to the parts. (Thus, using it in a scalar context
3185: # tells you how many parts you have in the problem:
3186: # $partcount = scalar($resource->countParts());
3187: # Don't use $self->{PARTS} directly because you don't know if it's been
3188: # computed yet.
3189:
3190: =pod
3191:
3192: =head2 Resource misc
3193:
3194: Misc. functions for the resource.
3195:
3196: =over 4
3197:
1.174 albertel 3198: =item * B<hasDiscussion>:
1.59 bowersj2 3199:
1.174 albertel 3200: Returns a false value if there has been discussion since the user last
3201: logged in, true if there has. Always returns false if the discussion
3202: data was not extracted when the nav map was constructed.
3203:
3204: =item * B<getFeedback>:
3205:
3206: Gets the feedback for the resource and returns the raw feedback string
3207: for the resource, or the null string if there is no feedback or the
3208: email data was not extracted when the nav map was constructed. Usually
3209: used like this:
1.59 bowersj2 3210:
3211: for (split(/\,/, $res->getFeedback())) {
3212: my $link = &Apache::lonnet::escape($_);
3213: ...
3214:
3215: and use the link as appropriate.
3216:
3217: =cut
3218:
3219: sub hasDiscussion {
3220: my $self = shift;
3221: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3222: }
3223:
3224: sub getFeedback {
3225: my $self = shift;
1.124 bowersj2 3226: my $source = $self->src();
1.125 bowersj2 3227: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 3228: return $self->{NAV_MAP}->getFeedback($source);
3229: }
3230:
3231: sub getErrors {
3232: my $self = shift;
3233: my $source = $self->src();
3234: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3235: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 3236: }
3237:
3238: =pod
3239:
1.174 albertel 3240: =item * B<parts>():
1.51 bowersj2 3241:
1.174 albertel 3242: Returns a list reference containing sorted strings corresponding to
1.193 bowersj2 3243: each part of the problem. Single part problems have only a part '0'.
3244: Multipart problems do not return their part '0', since they typically
3245: do not really matter.
1.174 albertel 3246:
3247: =item * B<countParts>():
3248:
3249: Returns the number of parts of the problem a student can answer. Thus,
3250: for single part problems, returns 1. For multipart, it returns the
1.193 bowersj2 3251: number of parts in the problem, not including psuedo-part 0.
1.51 bowersj2 3252:
1.192 bowersj2 3253: =item * B<multipart>():
3254:
1.193 bowersj2 3255: Returns true if the problem is multipart, false otherwise. Use this instead
3256: of countParts if all you want is multipart/not multipart.
1.192 bowersj2 3257:
1.187 bowersj2 3258: =item * B<responseType>($part):
3259:
3260: Returns the response type of the part, without the word "response" on the
3261: end. Example return values: 'string', 'essay', 'numeric', etc.
3262:
1.193 bowersj2 3263: =item * B<responseIds>($part):
1.187 bowersj2 3264:
1.193 bowersj2 3265: Retreives the response IDs for the given part as an array reference containing
3266: strings naming the response IDs. This may be empty.
1.187 bowersj2 3267:
1.51 bowersj2 3268: =back
3269:
3270: =cut
3271:
3272: sub parts {
3273: my $self = shift;
3274:
1.192 bowersj2 3275: if ($self->ext) { return []; }
1.67 bowersj2 3276:
1.51 bowersj2 3277: $self->extractParts();
3278: return $self->{PARTS};
3279: }
3280:
3281: sub countParts {
3282: my $self = shift;
3283:
3284: my $parts = $self->parts();
1.191 bowersj2 3285:
3286: # If I left this here, then it's not necessary.
3287: #my $delta = 0;
3288: #for my $part (@$parts) {
3289: # if ($part eq '0') { $delta--; }
3290: #}
1.66 bowersj2 3291:
3292: if ($self->{RESOURCE_ERROR}) {
3293: return 0;
3294: }
3295:
1.191 bowersj2 3296: return scalar(@{$parts}); # + $delta;
1.192 bowersj2 3297: }
3298:
3299: sub multipart {
3300: my $self = shift;
3301: return $self->countParts() > 1;
1.51 bowersj2 3302: }
3303:
1.187 bowersj2 3304: sub responseType {
1.184 bowersj2 3305: my $self = shift;
3306: my $part = shift;
3307:
3308: $self->extractParts();
1.187 bowersj2 3309: return $self->{RESPONSE_TYPE}->{$part};
3310: }
3311:
1.193 bowersj2 3312: sub responseIds {
1.187 bowersj2 3313: my $self = shift;
3314: my $part = shift;
3315:
3316: $self->extractParts();
3317: return $self->{RESPONSE_IDS}->{$part};
1.184 bowersj2 3318: }
3319:
3320: # Private function: Extracts the parts information, both part names and
1.187 bowersj2 3321: # part types, and saves it.
1.51 bowersj2 3322: sub extractParts {
3323: my $self = shift;
3324:
1.153 bowersj2 3325: return if (defined($self->{PARTS}));
1.67 bowersj2 3326: return if ($self->ext);
1.51 bowersj2 3327:
3328: $self->{PARTS} = [];
3329:
1.181 bowersj2 3330: my %parts;
3331:
1.82 bowersj2 3332: # Retrieve part count, if this is a problem
3333: if ($self->is_problem()) {
1.152 matthew 3334: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.82 bowersj2 3335: if (!$metadata) {
3336: $self->{RESOURCE_ERROR} = 1;
3337: $self->{PARTS} = [];
1.184 bowersj2 3338: $self->{PART_TYPE} = {};
1.82 bowersj2 3339: return;
3340: }
3341: foreach (split(/\,/,$metadata)) {
1.152 matthew 3342: if ($_ =~ /^part_(.*)$/) {
1.147 bowersj2 3343: my $part = $1;
1.183 bowersj2 3344: # This floods the logs if it blows up
3345: if (defined($parts{$part})) {
3346: Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3347: }
1.181 bowersj2 3348:
1.147 bowersj2 3349: # check to see if part is turned off.
1.181 bowersj2 3350:
3351: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3352: $parts{$part} = 1;
1.147 bowersj2 3353: }
1.82 bowersj2 3354: }
1.51 bowersj2 3355: }
1.82 bowersj2 3356:
3357:
1.181 bowersj2 3358: my @sortedParts = sort keys %parts;
1.82 bowersj2 3359: $self->{PARTS} = \@sortedParts;
1.187 bowersj2 3360:
3361: my %responseIdHash;
3362: my %responseTypeHash;
3363:
1.189 bowersj2 3364:
3365: # Init the responseIdHash
3366: foreach (@{$self->{PARTS}}) {
3367: $responseIdHash{$_} = [];
3368: }
3369:
1.187 bowersj2 3370: # Now, the unfortunate thing about this is that parts, part name, and
3371: # response if are delimited by underscores, but both the part
3372: # name and response id can themselves have underscores in them.
3373: # So we have to use our knowlege of part names to figure out
3374: # where the part names begin and end, and even then, it is possible
3375: # to construct ambiguous situations.
3376: foreach (split /,/, $metadata) {
3377: if ($_ =~ /^([a-zA-Z]+)response_(.*)/) {
3378: my $responseType = $1;
3379: my $partStuff = $2;
3380: my $partIdSoFar = '';
3381: my @partChunks = split /_/, $partStuff;
3382: my $i = 0;
3383:
3384: for ($i = 0; $i < scalar(@partChunks); $i++) {
3385: if ($partIdSoFar) { $partIdSoFar .= '_'; }
3386: $partIdSoFar .= $partChunks[$i];
3387: if ($parts{$partIdSoFar}) {
3388: my @otherChunks = @partChunks[$i+1..$#partChunks];
3389: my $responseId = join('_', @otherChunks);
1.188 bowersj2 3390: push @{$responseIdHash{$partIdSoFar}}, $responseId;
1.187 bowersj2 3391: $responseTypeHash{$partIdSoFar} = $responseType;
3392: last;
3393: }
3394: }
3395: }
3396: }
3397:
3398: $self->{RESPONSE_IDS} = \%responseIdHash;
3399: $self->{RESPONSE_TYPES} = \%responseTypeHash;
1.154 bowersj2 3400: }
3401:
1.51 bowersj2 3402: return;
3403: }
3404:
3405: =pod
3406:
3407: =head2 Resource Status
3408:
1.174 albertel 3409: Problem resources have status information, reflecting their various
3410: dates and completion statuses.
1.51 bowersj2 3411:
1.174 albertel 3412: There are two aspects to the status: the date-related information and
3413: the completion information.
1.51 bowersj2 3414:
1.174 albertel 3415: Idiomatic usage of these two methods would probably look something
3416: like
1.51 bowersj2 3417:
3418: foreach ($resource->parts()) {
3419: my $dateStatus = $resource->getDateStatus($_);
3420: my $completionStatus = $resource->getCompletionStatus($_);
3421:
1.70 bowersj2 3422: or
3423:
3424: my $status = $resource->status($_);
3425:
1.51 bowersj2 3426: ... use it here ...
3427: }
3428:
1.174 albertel 3429: Which you use depends on exactly what you are looking for. The
3430: status() function has been optimized for the nav maps display and may
3431: not precisely match what you need elsewhere.
1.101 bowersj2 3432:
1.174 albertel 3433: The symbolic constants shown below can be accessed through the
3434: resource object: C<$res->OPEN>.
1.101 bowersj2 3435:
1.51 bowersj2 3436: =over 4
3437:
1.174 albertel 3438: =item * B<getDateStatus>($part):
3439:
3440: ($part defaults to 0). A convenience function that returns a symbolic
3441: constant telling you about the date status of the part. The possible
3442: return values are:
1.51 bowersj2 3443:
3444: =back
3445:
3446: B<Date Codes>
3447:
3448: =over 4
3449:
1.174 albertel 3450: =item * B<OPEN_LATER>:
3451:
3452: The problem will be opened later.
3453:
3454: =item * B<OPEN>:
3455:
3456: Open and not yet due.
3457:
1.51 bowersj2 3458:
1.174 albertel 3459: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3460:
1.174 albertel 3461: The due date has passed, but the answer date has not yet arrived.
1.59 bowersj2 3462:
1.174 albertel 3463: =item * B<PAST_DUE_NO_ANSWER>:
1.54 bowersj2 3464:
1.174 albertel 3465: The due date has passed and there is no answer opening date set.
1.51 bowersj2 3466:
1.174 albertel 3467: =item * B<ANSWER_OPEN>:
1.51 bowersj2 3468:
1.174 albertel 3469: The answer date is here.
3470:
3471: =item * B<NETWORK_FAILURE>:
3472:
3473: The information is unknown due to network failure.
1.51 bowersj2 3474:
3475: =back
3476:
3477: =cut
3478:
3479: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 3480: sub OPEN_LATER { return 0; }
3481: sub OPEN { return 1; }
3482: sub PAST_DUE_NO_ANSWER { return 2; }
3483: sub PAST_DUE_ANSWER_LATER { return 3; }
3484: sub ANSWER_OPEN { return 4; }
3485: sub NOTHING_SET { return 5; }
3486: sub NETWORK_FAILURE { return 100; }
3487:
3488: # getDateStatus gets the date status for a given problem part.
3489: # Because answer date, due date, and open date are fully independent
3490: # (i.e., it is perfectly possible to *only* have an answer date),
3491: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3492: # (past, future, none given). This function handles this with a decision
3493: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 3494:
3495: sub getDateStatus {
3496: my $self = shift;
3497: my $part = shift;
3498: $part = "0" if (!defined($part));
1.54 bowersj2 3499:
3500: # Always return network failure if there was one.
1.51 bowersj2 3501: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3502:
3503: my $now = time();
3504:
1.53 bowersj2 3505: my $open = $self->opendate($part);
3506: my $due = $self->duedate($part);
3507: my $answer = $self->answerdate($part);
3508:
3509: if (!$open && !$due && !$answer) {
3510: # no data on the problem at all
3511: # should this be the same as "open later"? think multipart.
3512: return $self->NOTHING_SET;
3513: }
1.59 bowersj2 3514: if (!$open || $now < $open) {return $self->OPEN_LATER}
3515: if (!$due || $now < $due) {return $self->OPEN}
3516: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3517: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 3518: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 3519: }
3520:
3521: =pod
3522:
3523: B<>
3524:
3525: =over 4
3526:
1.174 albertel 3527: =item * B<getCompletionStatus>($part):
1.51 bowersj2 3528:
1.174 albertel 3529: ($part defaults to 0.) A convenience function that returns a symbolic
3530: constant telling you about the completion status of the part, with the
3531: following possible results:
3532:
3533: =back
1.51 bowersj2 3534:
3535: B<Completion Codes>
3536:
3537: =over 4
3538:
1.174 albertel 3539: =item * B<NOT_ATTEMPTED>:
3540:
3541: Has not been attempted at all.
3542:
3543: =item * B<INCORRECT>:
3544:
3545: Attempted, but wrong by student.
1.51 bowersj2 3546:
1.174 albertel 3547: =item * B<INCORRECT_BY_OVERRIDE>:
1.51 bowersj2 3548:
1.174 albertel 3549: Attempted, but wrong by instructor override.
1.51 bowersj2 3550:
1.174 albertel 3551: =item * B<CORRECT>:
1.51 bowersj2 3552:
1.174 albertel 3553: Correct or correct by instructor.
1.51 bowersj2 3554:
1.174 albertel 3555: =item * B<CORRECT_BY_OVERRIDE>:
1.51 bowersj2 3556:
1.174 albertel 3557: Correct by instructor override.
1.51 bowersj2 3558:
1.174 albertel 3559: =item * B<EXCUSED>:
3560:
3561: Excused. Not yet implemented.
3562:
3563: =item * B<NETWORK_FAILURE>:
3564:
3565: Information not available due to network failure.
3566:
3567: =item * B<ATTEMPTED>:
3568:
3569: Attempted, and not yet graded.
1.69 bowersj2 3570:
1.51 bowersj2 3571: =back
3572:
3573: =cut
3574:
1.53 bowersj2 3575: sub NOT_ATTEMPTED { return 10; }
3576: sub INCORRECT { return 11; }
3577: sub INCORRECT_BY_OVERRIDE { return 12; }
3578: sub CORRECT { return 13; }
3579: sub CORRECT_BY_OVERRIDE { return 14; }
3580: sub EXCUSED { return 15; }
1.69 bowersj2 3581: sub ATTEMPTED { return 16; }
1.51 bowersj2 3582:
3583: sub getCompletionStatus {
3584: my $self = shift;
3585: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3586:
1.108 bowersj2 3587: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 3588:
3589: # Left as seperate if statements in case we ever do more with this
3590: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3591: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3592: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3593: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3594: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 3595: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 3596: return $self->NOT_ATTEMPTED;
1.108 bowersj2 3597: }
3598:
3599: sub queryRestoreHash {
3600: my $self = shift;
3601: my $hashentry = shift;
3602: my $part = shift;
1.185 bowersj2 3603: $part = "0" if (!defined($part) || $part eq '');
1.108 bowersj2 3604: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3605:
3606: $self->getReturnHash();
3607:
3608: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 3609: }
3610:
3611: =pod
3612:
3613: B<Composite Status>
3614:
1.174 albertel 3615: Along with directly returning the date or completion status, the
3616: resource object includes a convenience function B<status>() that will
3617: combine the two status tidbits into one composite status that can
1.191 bowersj2 3618: represent the status of the resource as a whole. This method represents
3619: the concept of the thing we want to display to the user on the nav maps
3620: screen, which is a combination of completion and open status. The precise logic is
1.174 albertel 3621: documented in the comments of the status method. The following results
3622: may be returned, all available as methods on the resource object
1.185 bowersj2 3623: ($res->NETWORK_FAILURE): In addition to the return values that match
3624: the date or completion status, this function can return "ANSWER_SUBMITTED"
3625: if that problemstatus parameter value is set to No, suppressing the
3626: incorrect/correct feedback.
1.51 bowersj2 3627:
3628: =over 4
3629:
1.174 albertel 3630: =item * B<NETWORK_FAILURE>:
3631:
3632: The network has failed and the information is not available.
1.51 bowersj2 3633:
1.174 albertel 3634: =item * B<NOTHING_SET>:
1.53 bowersj2 3635:
1.174 albertel 3636: No dates have been set for this problem (part) at all. (Because only
3637: certain parts of a multi-part problem may be assigned, this can not be
3638: collapsed into "open later", as we do not know a given part will EVER
3639: be opened. For single part, this is the same as "OPEN_LATER".)
1.51 bowersj2 3640:
1.174 albertel 3641: =item * B<CORRECT>:
1.51 bowersj2 3642:
1.174 albertel 3643: For any reason at all, the part is considered correct.
1.54 bowersj2 3644:
1.174 albertel 3645: =item * B<EXCUSED>:
1.51 bowersj2 3646:
1.174 albertel 3647: For any reason at all, the problem is excused.
1.51 bowersj2 3648:
1.174 albertel 3649: =item * B<PAST_DUE_NO_ANSWER>:
1.51 bowersj2 3650:
1.174 albertel 3651: The problem is past due, not considered correct, and no answer date is
3652: set.
1.51 bowersj2 3653:
1.174 albertel 3654: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3655:
1.174 albertel 3656: The problem is past due, not considered correct, and an answer date in
3657: the future is set.
1.51 bowersj2 3658:
1.174 albertel 3659: =item * B<ANSWER_OPEN>:
3660:
3661: The problem is past due, not correct, and the answer is now available.
3662:
3663: =item * B<OPEN_LATER>:
3664:
3665: The problem is not yet open.
3666:
3667: =item * B<TRIES_LEFT>:
3668:
3669: The problem is open, has been tried, is not correct, but there are
3670: tries left.
3671:
3672: =item * B<INCORRECT>:
3673:
3674: The problem is open, and all tries have been used without getting the
3675: correct answer.
3676:
3677: =item * B<OPEN>:
3678:
3679: The item is open and not yet tried.
3680:
3681: =item * B<ATTEMPTED>:
3682:
3683: The problem has been attempted.
1.69 bowersj2 3684:
1.185 bowersj2 3685: =item * B<ANSWER_SUBMITTED>:
3686:
3687: An answer has been submitted, but the student should not see it.
3688:
1.51 bowersj2 3689: =back
3690:
3691: =cut
3692:
1.185 bowersj2 3693: sub TRIES_LEFT { return 20; }
3694: sub ANSWER_SUBMITTED { return 21; }
1.51 bowersj2 3695:
3696: sub status {
3697: my $self = shift;
3698: my $part = shift;
3699: if (!defined($part)) { $part = "0"; }
3700: my $completionStatus = $self->getCompletionStatus($part);
3701: my $dateStatus = $self->getDateStatus($part);
3702:
3703: # What we have is a two-dimensional matrix with 4 entries on one
3704: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 3705: # plus network failure and "no date data at all".
1.51 bowersj2 3706:
1.53 bowersj2 3707: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 3708:
1.186 bowersj2 3709: my $suppressFeedback = lc($self->parmval("problemstatus", $part)) eq 'no';
1.185 bowersj2 3710:
1.51 bowersj2 3711: # There are a few whole rows we can dispose of:
1.53 bowersj2 3712: if ($completionStatus == CORRECT ||
3713: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.185 bowersj2 3714: return $suppressFeedback? ANSWER_SUBMITTED : CORRECT;
1.69 bowersj2 3715: }
3716:
3717: if ($completionStatus == ATTEMPTED) {
3718: return ATTEMPTED;
1.53 bowersj2 3719: }
3720:
3721: # If it's EXCUSED, then return that no matter what
3722: if ($completionStatus == EXCUSED) {
3723: return EXCUSED;
1.51 bowersj2 3724: }
3725:
1.53 bowersj2 3726: if ($dateStatus == NOTHING_SET) {
3727: return NOTHING_SET;
1.51 bowersj2 3728: }
3729:
1.69 bowersj2 3730: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3731: # by 4 matrix (date statuses).
1.51 bowersj2 3732:
1.54 bowersj2 3733: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 3734: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 3735: return $dateStatus;
1.51 bowersj2 3736: }
3737:
1.53 bowersj2 3738: if ($dateStatus == ANSWER_OPEN) {
3739: return ANSWER_OPEN;
1.51 bowersj2 3740: }
3741:
3742: # Now: (incorrect, incorrect_override, not_attempted) x
3743: # (open_later), (open)
3744:
1.53 bowersj2 3745: if ($dateStatus == OPEN_LATER) {
3746: return OPEN_LATER;
1.51 bowersj2 3747: }
3748:
3749: # If it's WRONG...
1.53 bowersj2 3750: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 3751: # and there are TRIES LEFT:
1.79 bowersj2 3752: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 3753: return TRIES_LEFT;
1.51 bowersj2 3754: }
1.185 bowersj2 3755: return $suppressFeedback ? ANSWER_SUBMITTED : INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 3756: }
3757:
3758: # Otherwise, it's untried and open
1.53 bowersj2 3759: return OPEN;
1.191 bowersj2 3760: }
3761:
3762: =pod
3763:
3764: B<Completable>
3765:
3766: The completable method represents the concept of I<whether the student can
3767: currently do the problem>. If the student can do the problem, which means
3768: that it is open, there are tries left, and if the problem is manually graded
3769: or the grade is suppressed via problemstatus, the student has not tried it
3770: yet, then the method returns 1. Otherwise, it returns 0, to indicate that
3771: either the student has tried it and there is no feedback, or that for
3772: some reason it is no longer completable (not open yet, successfully completed,
3773: out of tries, etc.). As an example, this is used as the filter for the
3774: "Uncompleted Homework" option for the nav maps.
3775:
3776: If this does not quite meet your needs, do not fiddle with it (unless you are
3777: fixing it to better match the student's conception of "completable" because
3778: it's broken somehow)... make a new method.
3779:
3780: =cut
3781:
3782: sub completable {
3783: my $self = shift;
3784: if (!$self->is_problem()) { return 0; }
3785: my $partCount = $self->countParts();
3786:
3787: foreach my $part (@{$self->parts()}) {
3788: if ($part eq '0' && $partCount != 1) { next; }
3789: my $status = $self->status($part);
3790: # "If any of the parts are open, or have tries left (implies open),
3791: # and it is not "attempted" (manually graded problem), it is
3792: # not "complete"
3793: if (!(($status == OPEN() || $status == TRIES_LEFT())
3794: && $self->getCompletionStatus($part) != ATTEMPTED()
3795: && $status != ANSWER_SUBMITTED())) {
3796: return 0;
3797: }
3798: }
3799:
3800: # If all the parts were complete, so was this problem.
3801: return 1;
1.51 bowersj2 3802: }
3803:
3804: =pod
3805:
3806: =head2 Resource/Nav Map Navigation
3807:
3808: =over 4
3809:
1.174 albertel 3810: =item * B<getNext>():
3811:
3812: Retreive an array of the possible next resources after this
3813: one. Always returns an array, even in the one- or zero-element case.
3814:
3815: =item * B<getPrevious>():
1.85 bowersj2 3816:
1.174 albertel 3817: Retreive an array of the possible previous resources from this
3818: one. Always returns an array, even in the one- or zero-element case.
1.51 bowersj2 3819:
3820: =cut
3821:
3822: sub getNext {
3823: my $self = shift;
3824: my @branches;
3825: my $to = $self->to();
1.85 bowersj2 3826: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 3827: my $choice = $self->{NAV_MAP}->getById($branch);
3828: my $next = $choice->goesto();
3829: $next = $self->{NAV_MAP}->getById($next);
3830:
1.131 bowersj2 3831: push @branches, $next;
1.85 bowersj2 3832: }
3833: return \@branches;
3834: }
3835:
3836: sub getPrevious {
3837: my $self = shift;
3838: my @branches;
3839: my $from = $self->from();
3840: foreach my $branch ( split /,/, $from) {
3841: my $choice = $self->{NAV_MAP}->getById($branch);
3842: my $prev = $choice->comesfrom();
3843: $prev = $self->{NAV_MAP}->getById($prev);
3844:
1.131 bowersj2 3845: push @branches, $prev;
1.51 bowersj2 3846: }
3847: return \@branches;
1.131 bowersj2 3848: }
3849:
3850: sub browsePriv {
3851: my $self = shift;
3852: if (defined($self->{BROWSE_PRIV})) {
3853: return $self->{BROWSE_PRIV};
3854: }
3855:
3856: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 3857: }
3858:
3859: =pod
1.2 www 3860:
1.51 bowersj2 3861: =back
1.2 www 3862:
1.51 bowersj2 3863: =cut
1.2 www 3864:
1.51 bowersj2 3865: 1;
1.2 www 3866:
1.51 bowersj2 3867: __END__
1.2 www 3868:
3869:
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