Annotation of loncom/interface/lonnavmaps.pm, revision 1.174
1.2 www 1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
1.1 www 3: #
1.174 ! albertel 4: # $Id: lonnavmaps.pm,v 1.173 2003/04/04 21:00:54 albertel 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);
1.2 www 50:
1.133 bowersj2 51: # symbolic constants
52: sub SYMB { return 1; }
53: sub URL { return 2; }
54: sub NOTHING { return 3; }
55:
56: # Some data
57:
1.140 bowersj2 58: my $resObj = "Apache::lonnavmaps::resource";
59:
1.135 bowersj2 60: # Keep these mappings in sync with lonquickgrades, which uses the colors
61: # instead of the icons.
62: my %statusIconMap =
1.140 bowersj2 63: ( $resObj->NETWORK_FAILURE => '',
64: $resObj->NOTHING_SET => '',
65: $resObj->CORRECT => 'navmap.correct.gif',
66: $resObj->EXCUSED => 'navmap.correct.gif',
67: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
68: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
69: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
70: $resObj->OPEN_LATER => '',
71: $resObj->TRIES_LEFT => 'navmap.open.gif',
72: $resObj->INCORRECT => 'navmap.wrong.gif',
73: $resObj->OPEN => 'navmap.open.gif',
74: $resObj->ATTEMPTED => 'navmap.open.gif' );
1.135 bowersj2 75:
76: my %iconAltTags =
77: ( 'navmap.correct.gif' => 'Correct',
78: 'navmap.wrong.gif' => 'Incorrect',
79: 'navmap.open.gif' => 'Open' );
1.133 bowersj2 80:
1.136 bowersj2 81: # Defines a status->color mapping, null string means don't color
82: my %colormap =
1.140 bowersj2 83: ( $resObj->NETWORK_FAILURE => '',
84: $resObj->CORRECT => '',
85: $resObj->EXCUSED => '#3333FF',
86: $resObj->PAST_DUE_ANSWER_LATER => '',
87: $resObj->PAST_DUE_NO_ANSWER => '',
88: $resObj->ANSWER_OPEN => '#006600',
89: $resObj->OPEN_LATER => '',
90: $resObj->TRIES_LEFT => '',
91: $resObj->INCORRECT => '',
92: $resObj->OPEN => '',
93: $resObj->NOTHING_SET => '' );
1.136 bowersj2 94: # And a special case in the nav map; what to do when the assignment
95: # is not yet done and due in less then 24 hours
96: my $hurryUpColor = "#FF0000";
1.130 www 97:
1.1 www 98: sub handler {
1.99 bowersj2 99: my $r = shift;
1.118 bowersj2 100: real_handler($r);
101: }
102:
103: sub real_handler {
104: my $r = shift;
1.2 www 105:
1.51 bowersj2 106: # Handle header-only request
107: if ($r->header_only) {
108: if ($ENV{'browser.mathml'}) {
109: $r->content_type('text/xml');
110: } else {
111: $r->content_type('text/html');
112: }
113: $r->send_http_header;
114: return OK;
115: }
116:
117: # Send header, don't cache this page
118: if ($ENV{'browser.mathml'}) {
119: $r->content_type('text/xml');
120: } else {
121: $r->content_type('text/html');
122: }
123: &Apache::loncommon::no_cache($r);
124: $r->send_http_header;
125:
1.106 bowersj2 126: # Create the nav map
1.168 bowersj2 127: my $navmap = Apache::lonnavmaps::navmap->new(
1.51 bowersj2 128: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 129: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 130:
1.55 bowersj2 131:
132: if (!defined($navmap)) {
133: my $requrl = $r->uri;
134: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
135: return HTTP_NOT_ACCEPTABLE;
136: }
1.64 bowersj2 137:
1.111 bowersj2 138: $r->print("<html><head>\n");
1.150 www 139: $r->print("<title>Navigate Course Contents</title>");
140: # ------------------------------------------------------------ Get query string
141: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
1.158 bowersj2 142:
1.150 www 143: # ----------------------------------------------------- Force menu registration
144: my $addentries='';
145: if ($ENV{'form.register'}) {
146: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
147: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
148: $r->print(&Apache::lonmenu::registerurl(1));
149: }
1.111 bowersj2 150:
1.64 bowersj2 151: # Header
1.150 www 152: $r->print('</head>'.
153: &Apache::loncommon::bodytag('Navigate Course Contents','',
1.151 www 154: $addentries,'','',$ENV{'form.register'}));
1.64 bowersj2 155: $r->print('<script>window.focus();</script>');
1.101 bowersj2 156:
1.124 bowersj2 157: $r->rflush();
158:
159: # Now that we've displayed some stuff to the user, init the navmap
160: $navmap->init();
161:
1.95 bowersj2 162: $r->print('<br> ');
163: $r->rflush();
164:
1.55 bowersj2 165: # Check that it's defined
166: if (!($navmap->courseMapDefined())) {
167: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
168: '</body></html>');
169: return OK;
170: }
171:
1.155 bowersj2 172: # See if there's only one map in the top-level... if so,
173: # automatically display it
174: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
175: my $depth = 1;
176: $iterator->next();
177: my $curRes = $iterator->next();
178: my $sequenceCount = 0;
179: my $sequenceId;
180: while ($depth > 0) {
181: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
182: if ($curRes == $iterator->END_MAP()) { $depth--; }
183:
184: if (ref($curRes) && $curRes->is_sequence()) {
185: $sequenceCount++;
186: $sequenceId = $curRes->map_pc();
187: }
188:
189: $curRes = $iterator->next();
190: }
191:
192: if ($sequenceCount == 1) {
193: # The automatic iterator creation in the render call
194: # will pick this up.
195: $ENV{'form.filter'} = "$sequenceId";
196: }
197:
1.133 bowersj2 198: # renderer call
1.140 bowersj2 199: my $render = render({ 'cols' => [0,1,2,3],
200: 'url' => '/adm/navmaps',
1.169 bowersj2 201: 'navmap' => $navmap,
1.153 bowersj2 202: 'suppressNavmap' => 1,
1.140 bowersj2 203: 'r' => $r});
1.133 bowersj2 204:
1.168 bowersj2 205: $navmap->untieHashes();
1.51 bowersj2 206:
1.128 bowersj2 207: $r->print("</body></html>");
1.134 bowersj2 208: $r->rflush();
1.59 bowersj2 209:
1.51 bowersj2 210: return OK;
211: }
212:
213: # Convenience functions: Returns a string that adds or subtracts
214: # the second argument from the first hash, appropriate for the
215: # query string that determines which folders to recurse on
216: sub addToFilter {
217: my $hashIn = shift;
218: my $addition = shift;
219: my %hash = %$hashIn;
220: $hash{$addition} = 1;
221:
222: return join (",", keys(%hash));
223: }
224:
225: sub removeFromFilter {
226: my $hashIn = shift;
227: my $subtraction = shift;
228: my %hash = %$hashIn;
229:
230: delete $hash{$subtraction};
231: return join(",", keys(%hash));
232: }
233:
234: # Convenience function: Given a stack returned from getStack on the iterator,
235: # return the correct src() value.
236: # Later, this should add an anchor when we start putting anchors in pages.
237: sub getLinkForResource {
238: my $stack = shift;
239: my $res;
240:
241: # Check to see if there are any pages in the stack
242: foreach $res (@$stack) {
243: if (defined($res) && $res->is_page()) {
244: return $res->src();
245: }
246: }
247:
248: # Failing that, return the src of the last resource that is defined
249: # (when we first recurse on a map, it puts an undefined resource
250: # on the bottom because $self->{HERE} isn't defined yet, and we
251: # want the src for the map anyhow)
252: foreach (@$stack) {
253: if (defined($_)) { $res = $_; }
254: }
255:
256: return $res->src();
257: }
258:
1.53 bowersj2 259: # Convenience function: This seperates the logic of how to create
260: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
261: # etc.) into a seperate function. It takes a resource object as the
262: # first parameter, and the part number of the resource as the second.
263: # It's basically a big switch statement on the status of the resource.
264:
265: sub getDescription {
266: my $res = shift;
267: my $part = shift;
1.69 bowersj2 268: my $status = $res->status($part);
1.53 bowersj2 269:
270: if ($status == $res->NETWORK_FAILURE) { return ""; }
271: if ($status == $res->NOTHING_SET) {
272: return "Not currently assigned.";
273: }
274: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 275: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 276: }
277: if ($status == $res->OPEN) {
1.79 bowersj2 278: if ($res->duedate($part)) {
1.73 bowersj2 279: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 280: } else {
281: return "Open, no due date";
282: }
1.53 bowersj2 283: }
1.54 bowersj2 284: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 285: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 286: }
287: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 288: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 289: }
290: if ($status == $res->ANSWER_OPEN) {
291: return "Answer available";
292: }
1.59 bowersj2 293: if ($status == $res->EXCUSED) {
1.66 bowersj2 294: return "Excused by instructor";
1.59 bowersj2 295: }
1.69 bowersj2 296: if ($status == $res->ATTEMPTED) {
297: return "Not yet graded.";
298: }
1.59 bowersj2 299: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 300: my $tries = $res->tries($part);
301: my $maxtries = $res->maxtries($part);
302: my $triesString = "";
303: if ($tries && $maxtries) {
304: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
305: if ($maxtries > 1 && $maxtries - $tries == 1) {
306: $triesString = "<b>$triesString</b>";
307: }
308: }
1.66 bowersj2 309: if ($res->duedate()) {
1.73 bowersj2 310: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 311: " $triesString";
312: } else {
313: return "No due date $triesString";
314: }
1.59 bowersj2 315: }
1.53 bowersj2 316: }
317:
1.115 bowersj2 318: # Convenience function, so others can use it: Is the problem due in less then
319: # 24 hours, and still can be done?
320:
321: sub dueInLessThen24Hours {
322: my $res = shift;
323: my $part = shift;
324: my $status = $res->status($part);
325:
326: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
327: $status == $res->TRIES_LEFT()) &&
328: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
329: $res->duedate() > time();
330: }
331:
332: # Convenience function, so others can use it: Is there only one try remaining for the
333: # part, with more then one try to begin with, not due yet and still can be done?
334: sub lastTry {
335: my $res = shift;
336: my $part = shift;
337:
338: my $tries = $res->tries($part);
339: my $maxtries = $res->maxtries($part);
340: return $tries && $maxtries && $maxtries > 1 &&
341: $maxtries - $tries == 1 && $res->duedate() &&
342: $res->duedate() > time();
343: }
344:
1.101 bowersj2 345: # This puts a human-readable name on the ENV variable.
1.158 bowersj2 346: # FIXME: This needs better logic: Who gets the advanced view of navmaps?
347: # As of 3-13-03, it's an open question. Guy doesn't want to check
348: # roles directly because it should be a check of capabilities for future
349: # role compatibity. There is no capability that matches this one for
350: # now, so this is done. (A hack for 1.0 might be to simply check roles
351: # anyhow.)
1.68 bowersj2 352: sub advancedUser {
353: return $ENV{'user.adv'};
354: }
355:
1.73 bowersj2 356:
357: # timeToHumanString takes a time number and converts it to a
358: # human-readable representation, meant to be used in the following
359: # manner:
360: # print "Due $timestring"
361: # print "Open $timestring"
362: # print "Answer available $timestring"
363: # Very, very, very, VERY English-only... goodness help a localizer on
364: # this func...
1.53 bowersj2 365: sub timeToHumanString {
1.58 albertel 366: my ($time) = @_;
367: # zero, '0' and blank are bad times
1.73 bowersj2 368: if (!$time) {
369: return 'never';
370: }
371:
372: my $now = time();
373:
374: my @time = localtime($time);
375: my @now = localtime($now);
376:
377: # Positive = future
378: my $delta = $time - $now;
379:
380: my $minute = 60;
381: my $hour = 60 * $minute;
382: my $day = 24 * $hour;
383: my $week = 7 * $day;
384: my $inPast = 0;
385:
386: # Logic in comments:
387: # Is it now? (extremely unlikely)
388: if ( $delta == 0 ) {
389: return "this instant";
390: }
391:
392: if ($delta < 0) {
393: $inPast = 1;
394: $delta = -$delta;
395: }
396:
397: if ( $delta > 0 ) {
1.101 bowersj2 398:
1.73 bowersj2 399: my $tense = $inPast ? " ago" : "";
400: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 401:
402: # Less then a minute
1.73 bowersj2 403: if ( $delta < $minute ) {
404: if ($delta == 1) { return "${prefix}1 second$tense"; }
405: return "$prefix$delta seconds$tense";
406: }
407:
1.101 bowersj2 408: # Less then an hour
1.73 bowersj2 409: if ( $delta < $hour ) {
410: # If so, use minutes
411: my $minutes = floor($delta / 60);
412: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
413: return "$prefix$minutes minutes$tense";
414: }
415:
416: # Is it less then 24 hours away? If so,
417: # display hours + minutes
418: if ( $delta < $hour * 24) {
419: my $hours = floor($delta / $hour);
420: my $minutes = floor(($delta % $hour) / $minute);
421: my $hourString = "$hours hours";
422: my $minuteString = ", $minutes minutes";
423: if ($hours == 1) {
424: $hourString = "1 hour";
425: }
426: if ($minutes == 1) {
427: $minuteString = ", 1 minute";
428: }
429: if ($minutes == 0) {
430: $minuteString = "";
431: }
432: return "$prefix$hourString$minuteString$tense";
433: }
434:
435: # Less then 5 days away, display day of the week and
436: # HH:MM
437: if ( $delta < $day * 5 ) {
1.85 bowersj2 438: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 439: $timeStr =~ s/12:00 am/midnight/;
440: $timeStr =~ s/12:00 pm/noon/;
441: return ($inPast ? "last " : "next ") .
442: $timeStr;
443: }
444:
445: # Is it this year?
446: if ( $time[5] == $now[5]) {
447: # Return on Month Day, HH:MM meridian
448: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
449: $timeStr =~ s/12:00 am/midnight/;
450: $timeStr =~ s/12:00 pm/noon/;
451: return $timeStr;
452: }
453:
454: # Not this year, so show the year
455: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
456: $timeStr =~ s/12:00 am/midnight/;
457: $timeStr =~ s/12:00 pm/noon/;
458: return $timeStr;
1.58 albertel 459: }
1.53 bowersj2 460: }
461:
1.51 bowersj2 462:
1.133 bowersj2 463: =pod
464:
1.174 ! albertel 465: =head1 NAME
! 466:
! 467: Apache::lonnavmap - Subroutines to handle and render the navigation maps
! 468:
! 469: =head1 SYNOPSIS
! 470:
! 471: The main handler generates the navigational listing for the course,
! 472: the other objects export this information in a usable fashion for
! 473: other modules
1.133 bowersj2 474:
1.174 ! albertel 475: =head1 Object: render
1.133 bowersj2 476:
1.174 ! albertel 477: The navmap renderer package provides a sophisticated rendering of the
! 478: standard navigation maps interface into HTML. The provided nav map
! 479: handler is actually just a glorified call to this.
1.133 bowersj2 480:
1.174 ! albertel 481: Because of the large number of parameters this function presents,
! 482: instead of passing it arguments as is normal, pass it in an anonymous
! 483: hash with the given options. This is because there is no obvious order
! 484: you may wish to override these in and a hash is easier to read and
! 485: understand then "undef, undef, undef, 1, undef, undef, renderButton,
! 486: undef, 0" when you mostly want default behaviors.
! 487:
! 488: The package provides a function called 'render', called as
! 489: Apache::lonnavmaps::renderer->render({}).
1.51 bowersj2 490:
1.133 bowersj2 491: =head2 Overview of Columns
1.51 bowersj2 492:
1.174 ! albertel 493: The renderer will build an HTML table for the navmap and return
! 494: it. The table is consists of several columns, and a row for each
! 495: resource (or possibly each part). You tell the renderer how many
! 496: columns to create and what to place in each column, optionally using
! 497: one or more of the preparent columns, and the renderer will assemble
! 498: the table.
! 499:
! 500: Any additional generally useful column types should be placed in the
! 501: renderer code here, so anybody can use it anywhere else. Any code
! 502: specific to the current application (such as the addition of <input>
! 503: elements in a column) should be placed in the code of the thing using
! 504: the renderer.
! 505:
! 506: At the core of the renderer is the array reference COLS (see Example
! 507: section below for how to pass this correctly). The COLS array will
! 508: consist of entries of one of two types of things: Either an integer
! 509: representing one of the pre-packaged column types, or a sub reference
! 510: that takes a resource reference, a part number, and a reference to the
! 511: argument hash passed to the renderer, and returns a string that will
! 512: be inserted into the HTML representation as it.
! 513:
! 514: The pre-packaged column names are refered to by constants in the
! 515: Apache::lonnavmaps::renderer namespace. The following currently exist:
1.51 bowersj2 516:
1.174 ! albertel 517: =over 4
1.51 bowersj2 518:
1.174 ! albertel 519: =item * B<resource>:
1.51 bowersj2 520:
1.174 ! albertel 521: The general info about the resource: Link, icon for the type, etc. The
! 522: first column in the standard nav map display. This column also accepts
! 523: the following parameter in the renderer hash:
1.51 bowersj2 524:
1.133 bowersj2 525: =over 4
1.51 bowersj2 526:
1.174 ! albertel 527: =item * B<resource_nolink>:
1.51 bowersj2 528:
1.174 ! albertel 529: If true, the resource will not be linked. Default: false, resource
! 530: will have links.
! 531:
! 532: =item * B<resource_part_count>:
1.51 bowersj2 533:
1.174 ! albertel 534: If true (default), the resource will show a part count if the full
! 535: part list is not displayed. If false, the resource will never show a
! 536: part count.
1.133 bowersj2 537:
1.174 ! albertel 538: =item * B<resource_no_folder_link>:
1.133 bowersj2 539:
1.174 ! albertel 540: If true, the resource's folder will not be clickable to open or close
! 541: it. Default is false. True implies printCloseAll is false, since you
! 542: can't close or open folders when this is on anyhow.
1.144 bowersj2 543:
1.133 bowersj2 544: =back
1.51 bowersj2 545:
1.174 ! albertel 546: =item B<communication_status>:
! 547:
! 548: Whether there is discussion on the resource, email for the user, or
! 549: (lumped in here) perl errors in the execution of the problem. This is
! 550: the second column in the main nav map.
! 551:
! 552: =item B<quick_status>:
1.51 bowersj2 553:
1.174 ! albertel 554: An icon for the status of a problem, with four possible states:
! 555: Correct, incorrect, open, or none (not open yet, not a problem). The
! 556: third column of the standard navmap.
1.51 bowersj2 557:
1.174 ! albertel 558: =item B<long_status>:
! 559:
! 560: A text readout of the details of the current status of the problem,
! 561: such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 562:
1.133 bowersj2 563: =back
1.51 bowersj2 564:
1.133 bowersj2 565: If you add any others please be sure to document them here.
1.51 bowersj2 566:
1.174 ! albertel 567: An example of a column renderer that will show the ID number of a
! 568: resource, along with the part name if any:
1.51 bowersj2 569:
1.133 bowersj2 570: sub {
571: my ($resource, $part, $params) = @_;
572: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
573: return '<td>' . $resource->{ID} . '</td>';
574: }
1.51 bowersj2 575:
1.174 ! albertel 576: Note these functions are responsible for the TD tags, which allow them
! 577: to override vertical and horizontal alignment, etc.
1.130 www 578:
1.133 bowersj2 579: =head2 Parameters
1.115 bowersj2 580:
1.174 ! albertel 581: Most of these parameters are only useful if you are *not* using the
! 582: folder interface (i.e., the default first column), which is probably
! 583: the common case. If you are using this interface, then you should be
! 584: able to get away with just using 'cols' (to specify the columns
! 585: shown), 'url' (necessary for the folders to link to the current screen
! 586: correctly), and possibly 'queryString' if your app calls for it. In
! 587: that case, maintaining the state of the folders will be done
! 588: automatically.
1.140 bowersj2 589:
1.133 bowersj2 590: =over 4
1.51 bowersj2 591:
1.174 ! albertel 592: =item * B<iterator>:
! 593:
! 594: A reference to a fresh ::iterator to use from the navmaps. The
! 595: rendering will reflect the options passed to the iterator, so you can
! 596: use that to just render a certain part of the course, if you like. If
! 597: one is not passed, the renderer will attempt to construct one from
! 598: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
! 599: 'iterator_map' parameter if any.
! 600:
! 601: =item * B<iterator_map>:
! 602:
! 603: If you are letting the renderer do the iterator handling, you can
! 604: instruct the renderer to render only a particular map by passing it
! 605: the source of the map you want to process, like
! 606: '/res/103/jerf/navmap.course.sequence'.
! 607:
! 608: =item * B<navmap>:
! 609:
! 610: A reference to a navmap, used only if an iterator is not passed in. If
! 611: this is necessary to make an iterator but it is not passed in, a new
! 612: one will be constructed based on ENV info. This is useful to do basic
! 613: error checking before passing it off to render.
! 614:
! 615: =item * B<r>:
! 616:
! 617: The standard Apache response object. This must be passed to the
! 618: renderer or the course hash will be locked.
! 619:
! 620: =item * B<cols>:
! 621:
! 622: An array reference
! 623:
! 624: =item * B<showParts>:
! 625:
! 626: A flag. If yes (default), a line for the resource itself, and a line
! 627: for each part will be displayed. If not, only one line for each
! 628: resource will be displayed.
! 629:
! 630: =item * B<condenseParts>:
! 631:
! 632: A flag. If yes (default), if all parts of the problem have the same
! 633: status and that status is Nothing Set, Correct, or Network Failure,
! 634: then only one line will be displayed for that resource anyhow. If no,
! 635: all parts will always be displayed. If showParts is 0, this is
! 636: ignored.
! 637:
! 638: =item * B<jumpCount>:
! 639:
! 640: A string identifying the URL to place the anchor 'curloc' at. Default
! 641: to no anchor at all. It is the responsibility of the renderer user to
! 642: ensure that the #curloc is in the URL. By default, determined through
! 643: the use of the ENV{} 'jump' information, and should normally "just
! 644: work" correctly.
1.144 bowersj2 645:
1.174 ! albertel 646: =item * B<here>:
1.140 bowersj2 647:
1.174 ! albertel 648: A Symb identifying where to place the 'here' marker. Default empty,
! 649: which means no marker.
1.92 bowersj2 650:
1.174 ! albertel 651: =item * B<indentString>:
1.164 bowersj2 652:
1.174 ! albertel 653: A string identifying the indentation string to use. By default, this
! 654: is a 25 pixel whitespace image with no alt text.
1.92 bowersj2 655:
1.174 ! albertel 656: =item * B<queryString>:
1.51 bowersj2 657:
1.174 ! albertel 658: A string which will be prepended to the query string used when the
! 659: folders are opened or closed.
1.55 bowersj2 660:
1.174 ! albertel 661: =item * B<url>:
1.84 bowersj2 662:
1.174 ! albertel 663: The url the folders will link to, which should be the current
! 664: page. Required if the resource info column is shown.
1.115 bowersj2 665:
1.174 ! albertel 666: =item * B<currentJumpIndex>:
1.55 bowersj2 667:
1.174 ! albertel 668: Describes the currently-open row number to cause the browser to jump
! 669: to, because the user just opened that folder. By default, pulled from
! 670: the Jump information in the ENV{'form.*'}.
1.51 bowersj2 671:
1.174 ! albertel 672: =item * B<printKey>:
1.51 bowersj2 673:
1.174 ! albertel 674: If true, print the key that appears on the top of the standard
! 675: navmaps. Default is false.
1.139 bowersj2 676:
1.174 ! albertel 677: =item * B<printCloseAll>:
1.140 bowersj2 678:
1.174 ! albertel 679: If true, print the "Close all folders" or "open all folders"
! 680: links. Default is true.
1.140 bowersj2 681:
1.174 ! albertel 682: =item * B<filterFunc>:
1.153 bowersj2 683:
1.174 ! albertel 684: A function that takes the resource object as its only parameter and
! 685: returns a true or false value. If true, the resource is displayed. If
! 686: false, it is simply skipped in the display. By default, all resources
! 687: are shown.
! 688:
! 689: =item * B<suppressNavmaps>:
! 690:
! 691: If true, will not display Navigate Content resources. Default to
! 692: false.
1.143 bowersj2 693:
1.133 bowersj2 694: =back
1.51 bowersj2 695:
1.133 bowersj2 696: =head2 Additional Info
1.51 bowersj2 697:
1.174 ! albertel 698: In addition to the parameters you can pass to the renderer, which will
! 699: be passed through unchange to the column renderers, the renderer will
! 700: generate the following information which your renderer may find
! 701: useful:
! 702:
! 703: If you want to know how many rows were printed, the 'counter' element
! 704: of the hash passed into the render function will contain the
! 705: count. You may want to check whether any resources were printed at
! 706: all.
1.145 bowersj2 707:
1.133 bowersj2 708: =over 4
1.59 bowersj2 709:
1.133 bowersj2 710: =back
1.59 bowersj2 711:
1.133 bowersj2 712: =cut
1.59 bowersj2 713:
1.133 bowersj2 714: sub resource { return 0; }
715: sub communication_status { return 1; }
716: sub quick_status { return 2; }
717: sub long_status { return 3; }
1.124 bowersj2 718:
1.133 bowersj2 719: # Data for render_resource
1.51 bowersj2 720:
1.133 bowersj2 721: sub render_resource {
722: my ($resource, $part, $params) = @_;
1.51 bowersj2 723:
1.133 bowersj2 724: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 725:
1.134 bowersj2 726: my $link = $params->{"resourceLink"};
727: my $src = $resource->src();
728: my $it = $params->{"iterator"};
1.133 bowersj2 729: my $filter = $it->{FILTER};
730:
731: my $title = $resource->compTitle();
732: if ($src =~ /^\/uploaded\//) {
733: $nonLinkedText=$title;
734: $title = '';
735: }
736: my $partLabel = "";
737: my $newBranchText = "";
738:
739: # If this is a new branch, label it so
740: if ($params->{'isNewBranch'}) {
741: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51 bowersj2 742: }
743:
1.133 bowersj2 744: # links to open and close the folder
745: my $linkopen = "<a href='$link'>";
746: my $linkclose = "</a>";
1.51 bowersj2 747:
1.133 bowersj2 748: # Default icon: HTML page
749: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
750:
751: if ($resource->is_problem()) {
1.156 bowersj2 752: if ($part eq "" || $params->{'condensed'}) {
1.133 bowersj2 753: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
754: } else {
755: $icon = $params->{'indentString'};
756: }
757: }
1.51 bowersj2 758:
1.133 bowersj2 759: # Display the correct map icon to open or shut map
760: if ($resource->is_map()) {
761: my $mapId = $resource->map_pc();
762: my $nowOpen = !defined($filter->{$mapId});
763: if ($it->{CONDITION}) {
764: $nowOpen = !$nowOpen;
765: }
1.144 bowersj2 766:
767: if (!$params->{'resource_no_folder_link'}) {
768: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
769: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
770:
771: $linkopen = "<a href='" . $params->{'url'} . '?' .
772: $params->{'queryString'} . '&filter=';
773: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
774: addToFilter($filter, $mapId) :
775: removeFromFilter($filter, $mapId);
776: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
777: . $params->{'hereType'} . '&here=' .
778: &Apache::lonnet::escape($params->{'here'}) .
1.159 bowersj2 779: '&jump=' .
1.144 bowersj2 780: &Apache::lonnet::escape($resource->symb()) .
781: "&folderManip=1'>";
782: } else {
783: # Don't allow users to manipulate folder
784: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
785: '.nomanip.gif';
786: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
787:
788: $linkopen = "";
789: $linkclose = "";
790: }
1.133 bowersj2 791: }
1.51 bowersj2 792:
1.133 bowersj2 793: if ($resource->randomout()) {
794: $nonLinkedText .= ' <i>(hidden)</i> ';
795: }
796:
797: # We're done preparing and finally ready to start the rendering
798: my $result = "<td align='left' valign='center'>";
1.140 bowersj2 799:
800: my $indentLevel = $params->{'indentLevel'};
801: if ($newBranchText) { $indentLevel--; }
802:
1.133 bowersj2 803: # print indentation
1.140 bowersj2 804: for (my $i = 0; $i < $indentLevel; $i++) {
1.133 bowersj2 805: $result .= $params->{'indentString'};
1.84 bowersj2 806: }
807:
1.133 bowersj2 808: # Decide what to display
809: $result .= "$newBranchText$linkopen$icon$linkclose";
810:
811: my $curMarkerBegin = '';
812: my $curMarkerEnd = '';
1.51 bowersj2 813:
1.133 bowersj2 814: # Is this the current resource?
1.158 bowersj2 815: if (!$params->{'displayedHereMarker'} &&
816: $resource->symb() eq $params->{'here'} ) {
1.133 bowersj2 817: $curMarkerBegin = '<font color="red" size="+2">> </font>';
818: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.158 bowersj2 819: $params->{'displayedHereMarker'} = 1;
1.51 bowersj2 820: }
821:
1.156 bowersj2 822: if ($resource->is_problem() && $part ne "" &&
1.133 bowersj2 823: !$params->{'condensed'}) {
824: $partLabel = " (Part $part)";
825: $title = "";
1.51 bowersj2 826: }
827:
1.163 bowersj2 828: if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133 bowersj2 829: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 830: }
831:
1.144 bowersj2 832: if (!$params->{'resource_nolink'}) {
833: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
834: } else {
835: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
836: }
1.51 bowersj2 837:
1.133 bowersj2 838: return $result;
839: }
1.51 bowersj2 840:
1.133 bowersj2 841: sub render_communication_status {
842: my ($resource, $part, $params) = @_;
1.134 bowersj2 843: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
844:
845: my $link = $params->{"resourceLink"};
846: my $linkopen = "<a href='$link'>";
847: my $linkclose = "</a>";
848:
849: if ($resource->hasDiscussion()) {
850: $discussionHTML = $linkopen .
851: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
852: $linkclose;
853: }
854:
855: if ($resource->getFeedback()) {
856: my $feedback = $resource->getFeedback();
857: foreach (split(/\,/, $feedback)) {
858: if ($_) {
859: $feedbackHTML .= ' <a href="/adm/email?display='
860: . &Apache::lonnet::escape($_) . '">'
861: . '<img src="/adm/lonMisc/feedback.gif" '
862: . 'border="0" /></a>';
863: }
864: }
865: }
866:
867: if ($resource->getErrors()) {
868: my $errors = $resource->getErrors();
869: foreach (split(/,/, $errors)) {
870: if ($_) {
871: $errorHTML .= ' <a href="/adm/email?display='
872: . &Apache::lonnet::escape($_) . '">'
873: . '<img src="/adm/lonMisc/bomb.gif" '
874: . 'border="0" /></a>';
875: }
876: }
877: }
878:
879: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
880:
1.133 bowersj2 881: }
882: sub render_quick_status {
883: my ($resource, $part, $params) = @_;
1.135 bowersj2 884: my $result = "";
885: my $firstDisplayed = !$params->{'condensed'} &&
886: $params->{'multipart'} && $part eq "0";
887:
888: my $link = $params->{"resourceLink"};
889: my $linkopen = "<a href='$link'>";
890: my $linkclose = "</a>";
891:
892: if ($resource->is_problem() &&
893: !$firstDisplayed) {
894: my $icon = $statusIconMap{$resource->status($part)};
895: my $alt = $iconAltTags{$icon};
896: if ($icon) {
897: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
898: } else {
899: $result .= "<td width='30'> </td>\n";
900: }
901: } else { # not problem, no icon
902: $result .= "<td width='30'> </td>\n";
903: }
904:
905: return $result;
1.133 bowersj2 906: }
907: sub render_long_status {
908: my ($resource, $part, $params) = @_;
1.136 bowersj2 909: my $result = "<td align='right' valign='center'>\n";
910: my $firstDisplayed = !$params->{'condensed'} &&
911: $params->{'multipart'} && $part eq "0";
912:
913: my $color;
914: if ($resource->is_problem()) {
915: $color = $colormap{$resource->status};
916:
917: if (dueInLessThen24Hours($resource, $part) ||
918: lastTry($resource, $part)) {
919: $color = $hurryUpColor;
920: }
921: }
922:
923: if ($resource->kind() eq "res" &&
924: $resource->is_problem() &&
925: !$firstDisplayed) {
926: if ($color) {$result .= "<font color=\"$color\"><b>"; }
927: $result .= getDescription($resource, $part);
928: if ($color) {$result .= "</b></font>"; }
929: }
930: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
931: $result .= '(randomly select ' . $resource->randompick() .')';
932: }
933:
934: $result .= " </td>\n";
935:
936: return $result;
1.51 bowersj2 937: }
938:
1.133 bowersj2 939: my @preparedColumns = (\&render_resource, \&render_communication_status,
940: \&render_quick_status, \&render_long_status);
1.132 bowersj2 941:
942: sub setDefault {
943: my ($val, $default) = @_;
944: if (!defined($val)) { return $default; }
945: return $val;
946: }
947:
948: sub render {
949: my $args = shift;
1.140 bowersj2 950: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
951: my $result = '';
952:
1.132 bowersj2 953: # Configure the renderer.
954: my $cols = $args->{'cols'};
955: if (!defined($cols)) {
956: # no columns, no nav maps.
957: return '';
958: }
1.140 bowersj2 959: my $mustCloseNavMap = 0;
960: my $navmap;
961: if (defined($args->{'navmap'})) {
962: $navmap = $args->{'navmap'};
963: }
964:
1.158 bowersj2 965: my $r = $args->{'r'};
1.140 bowersj2 966: my $queryString = $args->{'queryString'};
1.159 bowersj2 967: my $jump = $args->{'jump'};
1.158 bowersj2 968: my $here = $args->{'here'};
1.153 bowersj2 969: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.140 bowersj2 970: my $currentJumpDelta = 2; # change this to change how many resources are displayed
971: # before the current resource when using #current
972:
973: # If we were passed 'here' information, we are not rendering
974: # after a folder manipulation, and we were not passed an
975: # iterator, make sure we open the folders to show the "here"
976: # marker
977: my $filterHash = {};
978: # Figure out what we're not displaying
979: foreach (split(/\,/, $ENV{"form.filter"})) {
980: if ($_) {
981: $filterHash->{$_} = "1";
982: }
983: }
984:
985: my $condition = 0;
986: if ($ENV{'form.condition'}) {
987: $condition = 1;
988: }
989:
990: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
991: # Step 1: Check to see if we have a navmap
992: if (!defined($navmap)) {
1.171 bowersj2 993: $navmap = Apache::lonnavmaps::navmap->new(
1.140 bowersj2 994: $ENV{"request.course.fn"}.".db",
995: $ENV{"request.course.fn"}."_parms.db", 1, 1);
996: $mustCloseNavMap = 1;
997: }
998: $navmap->init();
999:
1000: # Step two: Locate what kind of here marker is necessary
1001: # Determine where the "here" marker is and where the screen jumps to.
1002:
1003: if ($ENV{'form.symb'}) {
1004: $here = $jump = $ENV{'form.symb'};
1005: } elsif ($ENV{'form.postdata'}) {
1006: # couldn't find a symb, is there a URL?
1007: my $currenturl = $ENV{'form.postdata'};
1.158 bowersj2 1008: #$currenturl=~s/^http\:\/\///;
1009: #$currenturl=~s/^[^\/]+//;
1.140 bowersj2 1010:
1.158 bowersj2 1011: $here = $jump = &Apache::lonnet::symbread($currenturl);
1.140 bowersj2 1012: }
1.158 bowersj2 1013:
1.140 bowersj2 1014: # Step three: Ensure the folders are open
1015: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1016: my $depth = 1;
1017: $mapIterator->next(); # discard the first BEGIN_MAP
1018: my $curRes = $mapIterator->next();
1019: my $found = 0;
1020:
1021: # We only need to do this if we need to open the maps to show the
1022: # current position. This will change the counter so we can't count
1023: # for the jump marker with this loop.
1024: while ($depth > 0 && !$found) {
1025: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1026: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1027:
1.158 bowersj2 1028: if (ref($curRes) && $curRes->symb() eq $here) {
1.140 bowersj2 1029: my $mapStack = $mapIterator->getStack();
1030:
1031: # Ensure the parent maps are open
1032: for my $map (@{$mapStack}) {
1033: if ($condition) {
1034: undef $filterHash->{$map->map_pc()};
1035: } else {
1036: $filterHash->{$map->map_pc()} = 1;
1037: }
1038: }
1039: $found = 1;
1040: }
1041:
1042: $curRes = $mapIterator->next();
1043: }
1.159 bowersj2 1044: }
1.140 bowersj2 1045:
1046: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1047: # If this is a click on a folder or something, we want to preserve the "here"
1048: # from the querystring, and get the new "jump" marker
1049: $here = $ENV{'form.here'};
1050: $jump = $ENV{'form.jump'};
1051: }
1052:
1.132 bowersj2 1053: my $it = $args->{'iterator'};
1054: if (!defined($it)) {
1.140 bowersj2 1055: # Construct a default iterator based on $ENV{'form.'} information
1056:
1057: # Step 1: Check to see if we have a navmap
1058: if (!defined($navmap)) {
1.164 bowersj2 1059: $navmap = Apache::lonnavmaps::navmap->new($r,
1.140 bowersj2 1060: $ENV{"request.course.fn"}.".db",
1061: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1062: $mustCloseNavMap = 1;
1063: }
1064: # Paranoia: Make sure it's ready
1065: $navmap->init();
1066:
1.144 bowersj2 1067: # See if we're being passed a specific map
1068: if ($args->{'iterator_map'}) {
1069: my $map = $args->{'iterator_map'};
1.145 bowersj2 1070: $map = $navmap->getResourceByUrl($map);
1.144 bowersj2 1071: my $firstResource = $map->map_start();
1072: my $finishResource = $map->map_finish();
1073:
1074: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1075: } else {
1076: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1077: }
1.132 bowersj2 1078: }
1079:
1.159 bowersj2 1080: # (re-)Locate the jump point, if any
1081: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1082: my $depth = 1;
1083: $mapIterator->next();
1084: my $curRes = $mapIterator->next();
1085: my $foundJump = 0;
1086: my $counter = 0;
1087:
1088: while ($depth > 0 && !$foundJump) {
1089: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1090: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1091: if (ref($curRes)) { $counter++; }
1092:
1093: if (ref($curRes) && $jump eq $curRes->symb()) {
1094:
1095: # This is why we have to use the main iterator instead of the
1096: # potentially faster DFS: The count has to be the same, so
1097: # the order has to be the same, which DFS won't give us.
1098: $args->{'currentJumpIndex'} = $counter;
1099: $foundJump = 1;
1100: }
1101:
1102: $curRes = $mapIterator->next();
1103: }
1104:
1.132 bowersj2 1105: my $showParts = setDefault($args->{'showParts'}, 1);
1106: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139 bowersj2 1107: # keeps track of when the current resource is found,
1108: # so we can back up a few and put the anchor above the
1109: # current resource
1.140 bowersj2 1110: my $printKey = $args->{'printKey'};
1111: my $printCloseAll = $args->{'printCloseAll'};
1112: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.143 bowersj2 1113: my $filterFunc = setDefault($args->{'filterFunc'},
1114: sub {return 1;});
1.144 bowersj2 1115:
1.140 bowersj2 1116: # Print key?
1117: if ($printKey) {
1118: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1119: my $date=localtime;
1120: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1121: if ($navmap->{LAST_CHECK}) {
1122: $result .=
1123: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1124: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1125: '</td><td align="center" valign="bottom"> '.
1126: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1127: '</td>';
1128: } else {
1129: $result .= '<td align="center" valign="bottom"> '.
1130: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1131: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1132: '</td>';
1133: }
1134:
1135: $result .= '</tr></table>';
1136: }
1137:
1.172 bowersj2 1138: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.140 bowersj2 1139: if ($condition) {
1140: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1.158 bowersj2 1141: "&here=" . Apache::lonnet::escape($here) .
1.140 bowersj2 1142: "\">Close All Folders</a>";
1143: } else {
1144: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1.158 bowersj2 1145: "&here=" . Apache::lonnet::escape($here) .
1.140 bowersj2 1146: "\">Open All Folders</a>";
1147: }
1.143 bowersj2 1148: $result .= "<br /><br />\n";
1.140 bowersj2 1149: }
1150:
1151: if ($r) {
1152: $r->print($result);
1153: $r->rflush();
1154: $result = "";
1155: }
1.132 bowersj2 1156: # End parameter setting
1.133 bowersj2 1157:
1.132 bowersj2 1158: # Data
1.140 bowersj2 1159: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132 bowersj2 1160: my $res = "Apache::lonnavmaps::resource";
1161: my %condenseStatuses =
1162: ( $res->NETWORK_FAILURE => 1,
1163: $res->NOTHING_SET => 1,
1164: $res->CORRECT => 1 );
1165: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 1166:
1167: # Shared variables
1168: $args->{'counter'} = 0; # counts the rows
1169: $args->{'indentLevel'} = 0;
1170: $args->{'isNewBranch'} = 0;
1171: $args->{'condensed'} = 0;
1172: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1173: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 1174:
1.133 bowersj2 1175: my $displayedJumpMarker = 0;
1.132 bowersj2 1176: # Set up iteration.
1.159 bowersj2 1177: $depth = 1;
1.132 bowersj2 1178: $it->next(); # discard initial BEGIN_MAP
1.159 bowersj2 1179: $curRes = $it->next();
1.132 bowersj2 1180: my $now = time();
1181: my $in24Hours = $now + 24 * 60 * 60;
1182: my $rownum = 0;
1183:
1.141 bowersj2 1184: # export "here" marker information
1185: $args->{'here'} = $here;
1186:
1.132 bowersj2 1187: while ($depth > 0) {
1188: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1189: if ($curRes == $it->END_MAP()) { $depth--; }
1190:
1191: # Maintain indentation level.
1192: if ($curRes == $it->BEGIN_MAP() ||
1193: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1194: $args->{'indentLevel'}++;
1.132 bowersj2 1195: }
1196: if ($curRes == $it->END_MAP() ||
1197: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1198: $args->{'indentLevel'}--;
1.132 bowersj2 1199: }
1200: # Notice new branches
1201: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1202: $args->{'isNewBranch'} = 1;
1203: }
1204:
1205: # If this isn't an actual resource, continue on
1206: if (!ref($curRes)) {
1207: next;
1.132 bowersj2 1208: }
1.133 bowersj2 1209:
1210: $args->{'counter'}++;
1.143 bowersj2 1211:
1212: # If this has been filtered out, continue on
1213: if (!(&$filterFunc($curRes))) {
1214: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1215: next;
1216: }
1.132 bowersj2 1217:
1.153 bowersj2 1218: # If we're suppressing navmaps and this is a navmap, continue on
1219: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1220: next;
1221: }
1222:
1.132 bowersj2 1223: # Does it have multiple parts?
1.133 bowersj2 1224: $args->{'multipart'} = 0;
1225: $args->{'condensed'} = 0;
1.132 bowersj2 1226: my @parts;
1227:
1228: # Decide what parts to show.
1.133 bowersj2 1229: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1230: @parts = @{$curRes->parts()};
1.133 bowersj2 1231: $args->{'multipart'} = scalar(@parts) > 1;
1.132 bowersj2 1232:
1233: if ($condenseParts) { # do the condensation
1234: if (!$curRes->opendate("0")) {
1.162 bowersj2 1235: @parts = ();
1.133 bowersj2 1236: $args->{'condensed'} = 1;
1.132 bowersj2 1237: }
1.133 bowersj2 1238: if (!$args->{'condensed'}) {
1.132 bowersj2 1239: # Decide whether to condense based on similarity
1240: my $status = $curRes->status($parts[1]);
1241: my $due = $curRes->duedate($parts[1]);
1242: my $open = $curRes->opendate($parts[1]);
1243: my $statusAllSame = 1;
1244: my $dueAllSame = 1;
1245: my $openAllSame = 1;
1246: for (my $i = 2; $i < scalar(@parts); $i++) {
1247: if ($curRes->status($parts[$i]) != $status){
1248: $statusAllSame = 0;
1249: }
1250: if ($curRes->duedate($parts[$i]) != $due ) {
1251: $dueAllSame = 0;
1252: }
1253: if ($curRes->opendate($parts[$i]) != $open) {
1254: $openAllSame = 0;
1255: }
1256: }
1257: # $*allSame is true if all the statuses were
1258: # the same. Now, if they are all the same and
1259: # match one of the statuses to condense, or they
1260: # are all open with the same due date, or they are
1261: # all OPEN_LATER with the same open date, display the
1262: # status of the first non-zero part (to get the 'correct'
1263: # status right, since 0 is never 'correct' or 'open').
1264: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1265: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1266: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.161 bowersj2 1267: @parts = ();
1.133 bowersj2 1268: $args->{'condensed'} = 1;
1.132 bowersj2 1269: }
1270:
1271: }
1272: }
1.157 bowersj2 1273: }
1.132 bowersj2 1274:
1275: # If the multipart problem was condensed, "forget" it was multipart
1276: if (scalar(@parts) == 1) {
1.133 bowersj2 1277: $args->{'multipart'} = 0;
1.132 bowersj2 1278: }
1279:
1280: # Now, we've decided what parts to show. Loop through them and
1281: # show them.
1.156 bowersj2 1282: foreach my $part ('', @parts) {
1283: if ($part eq '0') {
1284: next;
1285: }
1.132 bowersj2 1286: $rownum ++;
1287: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1288:
1289: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1290:
1291: # Set up some data about the parts that the cols might want
1292: my $filter = $it->{FILTER};
1293: my $stack = $it->getStack();
1294: my $src = getLinkForResource($stack);
1295:
1296: my $srcHasQuestion = $src =~ /\?/;
1297: $args->{"resourceLink"} = $src.
1298: ($srcHasQuestion?'&':'?') .
1.137 bowersj2 1299: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1.132 bowersj2 1300:
1301: # Now, display each column.
1302: foreach my $col (@$cols) {
1.139 bowersj2 1303: my $colHTML = '';
1304: if (ref($col)) {
1305: $colHTML .= &$col($curRes, $part, $args);
1306: } else {
1307: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1308: }
1.132 bowersj2 1309:
1.133 bowersj2 1310: # If this is the first column and it's time to print
1311: # the anchor, do so
1312: if ($col == $cols->[0] &&
1313: $args->{'counter'} == $args->{'currentJumpIndex'} -
1.139 bowersj2 1314: $currentJumpDelta) {
1315: # Jam the anchor after the <td> tag;
1316: # necessary for valid HTML (which Mozilla requires)
1317: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133 bowersj2 1318: $displayedJumpMarker = 1;
1319: }
1.139 bowersj2 1320: $result .= $colHTML . "\n";
1.132 bowersj2 1321: }
1.139 bowersj2 1322: $result .= " </tr>\n";
1.140 bowersj2 1323: $args->{'isNewBranch'} = 0;
1.139 bowersj2 1324: }
1.153 bowersj2 1325:
1.139 bowersj2 1326: if ($r && $rownum % 20 == 0) {
1327: $r->print($result);
1328: $result = "";
1329: $r->rflush();
1.132 bowersj2 1330: }
1.156 bowersj2 1331: } continue {
1.132 bowersj2 1332: $curRes = $it->next();
1333: }
1334:
1.134 bowersj2 1335: # Print out the part that jumps to #curloc if it exists
1.159 bowersj2 1336: # delay needed because the browser is processing the jump before
1337: # it finishes rendering, so it goes to the wrong place!
1338: # onload might be better, but this routine has no access to that.
1339: # On mozilla, the 0-millisecond timeout seems to prevent this;
1340: # it's quite likely this might fix other browsers, too, and
1341: # certainly won't hurt anything.
1.139 bowersj2 1342: if ($displayedJumpMarker) {
1.159 bowersj2 1343: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1.134 bowersj2 1344: }
1345:
1.132 bowersj2 1346: $result .= "</table>";
1.140 bowersj2 1347:
1348: if ($r) {
1349: $r->print($result);
1350: $result = "";
1351: $r->rflush();
1352: }
1353:
1.164 bowersj2 1354: #if ($mustCloseNavMap) { $navmap->untieHashes(); }
1.132 bowersj2 1355:
1356: return $result;
1357: }
1358:
1.133 bowersj2 1359: 1;
1360:
1361: package Apache::lonnavmaps::navmap;
1362:
1363: =pod
1364:
1.174 ! albertel 1365: lonnavmaps provides functions and objects for dealing with the
! 1366: compiled course hashes generated when a user enters the course, the
! 1367: Apache handler for the "Navigation Map" button, and a flexible
! 1368: prepared renderer for navigation maps that are easy to use anywhere.
! 1369:
! 1370: =head1 Object: navmap
1.133 bowersj2 1371:
1.174 ! albertel 1372: Encapsulating the compiled nav map
1.133 bowersj2 1373:
1.174 ! albertel 1374: navmap is an object that encapsulates a compiled course map and
! 1375: provides a reasonable interface to it.
1.133 bowersj2 1376:
1.174 ! albertel 1377: Most notably it provides a way to navigate the map sensibly and a
! 1378: flexible iterator that makes it easy to write various renderers based
! 1379: on nav maps.
1.133 bowersj2 1380:
1381: You must obtain resource objects through the navmap object.
1382:
1383: =head2 Methods
1384:
1385: =over 4
1386:
1.174 ! albertel 1387: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
! 1388: genMailDiscussStatus):
1.133 bowersj2 1389:
1.174 ! albertel 1390: Binds a new navmap object to the compiled nav map hash and parm hash
! 1391: given as filenames. genCourseAndUserOptions is a flag saying whether
! 1392: the course options and user options hash should be generated. This is
! 1393: for when you are using the parameters of the resources that require
! 1394: them; see documentation in resource object
! 1395: documentation. genMailDiscussStatus causes the nav map to retreive
! 1396: information about the email and discussion status of
! 1397: resources. Returns the navmap object if this is successful, or
! 1398: B<undef> if not. You must check for undef; errors will occur when you
! 1399: try to use the other methods otherwise.
! 1400:
! 1401: =item * B<getIterator>(first, finish, filter, condition):
! 1402:
! 1403: See iterator documentation below.
1.133 bowersj2 1404:
1405: =cut
1406:
1407: use strict;
1408: use GDBM_File;
1409:
1410: sub new {
1411: # magic invocation to create a class instance
1412: my $proto = shift;
1413: my $class = ref($proto) || $proto;
1414: my $self = {};
1415:
1416: $self->{NAV_HASH_FILE} = shift;
1417: $self->{PARM_HASH_FILE} = shift;
1418: $self->{GENERATE_COURSE_USER_OPT} = shift;
1419: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1420:
1421: # Resource cache stores navmap resources as we reference them. We generate
1422: # them on-demand so we don't pay for creating resources unless we use them.
1423: $self->{RESOURCE_CACHE} = {};
1424:
1425: # Network failure flag, if we accessed the course or user opt and
1426: # failed
1427: $self->{NETWORK_FAILURE} = 0;
1428:
1429: # tie the nav hash
1430:
1.168 bowersj2 1431: my %navmaphash;
1432: my %parmhash;
1433: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1.133 bowersj2 1434: &GDBM_READER(), 0640))) {
1435: return undef;
1436: }
1437:
1.168 bowersj2 1438: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1.133 bowersj2 1439: &GDBM_READER(), 0640)))
1440: {
1.170 matthew 1441: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1442: return undef;
1443: }
1444:
1.168 bowersj2 1445: $self->{NAV_HASH} = \%navmaphash;
1446: $self->{PARM_HASH} = \%parmhash;
1.140 bowersj2 1447: $self->{INITED} = 0;
1.133 bowersj2 1448:
1449: bless($self);
1450:
1451: return $self;
1452: }
1453:
1454: sub init {
1455: my $self = shift;
1.140 bowersj2 1456: if ($self->{INITED}) { return; }
1.133 bowersj2 1457:
1458: # If the course opt hash and the user opt hash should be generated,
1459: # generate them
1460: if ($self->{GENERATE_COURSE_USER_OPT}) {
1461: my $uname=$ENV{'user.name'};
1462: my $udom=$ENV{'user.domain'};
1463: my $uhome=$ENV{'user.home'};
1464: my $cid=$ENV{'request.course.id'};
1465: my $chome=$ENV{'course.'.$cid.'.home'};
1466: my ($cdom,$cnum)=split(/\_/,$cid);
1467:
1468: my $userprefix=$uname.'_'.$udom.'_';
1469:
1470: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1471: unless ($uhome eq 'no_host') {
1472: # ------------------------------------------------- Get coursedata (if present)
1473: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1474: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1475: ':resourcedata',$chome);
1476: if ($reply!~/^error\:/) {
1477: $courserdatas{$cid}=$reply;
1478: $courserdatas{$cid.'.last_cache'}=time;
1479: }
1480: # check to see if network failed
1481: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1482: {
1483: $self->{NETWORK_FAILURE} = 1;
1484: }
1485: }
1486: foreach (split(/\&/,$courserdatas{$cid})) {
1487: my ($name,$value)=split(/\=/,$_);
1488: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1489: &Apache::lonnet::unescape($value);
1490: }
1491: # --------------------------------------------------- Get userdata (if present)
1492: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1493: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1494: if ($reply!~/^error\:/) {
1495: $userrdatas{$uname.'___'.$udom}=$reply;
1496: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1497: }
1498: # check to see if network failed
1499: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1500: {
1501: $self->{NETWORK_FAILURE} = 1;
1502: }
1503: }
1504: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1505: my ($name,$value)=split(/\=/,$_);
1506: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1507: &Apache::lonnet::unescape($value);
1508: }
1509: $self->{COURSE_OPT} = \%courseopt;
1510: $self->{USER_OPT} = \%useropt;
1511: }
1512: }
1513:
1514: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1515: my $cid=$ENV{'request.course.id'};
1516: my ($cdom,$cnum)=split(/\_/,$cid);
1517:
1518: my %emailstatus = &Apache::lonnet::dump('email_status');
1519: my $logoutTime = $emailstatus{'logout'};
1520: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1521: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1522: $courseLeaveTime : $logoutTime);
1523: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1524: $cdom, $cnum);
1525: my %feedback=();
1526: my %error=();
1527: my $keys = &Apache::lonnet::reply('keys:'.
1528: $ENV{'user.domain'}.':'.
1529: $ENV{'user.name'}.':nohist_email',
1530: $ENV{'user.home'});
1531:
1532: foreach my $msgid (split(/\&/, $keys)) {
1533: $msgid=&Apache::lonnet::unescape($msgid);
1534: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1535: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1536: my ($what,$url)=($1,$2);
1537: my %status=
1538: &Apache::lonnet::get('email_status',[$msgid]);
1539: if ($status{$msgid}=~/^error\:/) {
1540: $status{$msgid}='';
1541: }
1542:
1543: if (($status{$msgid} eq 'new') ||
1544: (!$status{$msgid})) {
1545: if ($what eq 'Error') {
1546: $error{$url}.=','.$msgid;
1547: } else {
1548: $feedback{$url}.=','.$msgid;
1549: }
1550: }
1551: }
1552: }
1553:
1554: $self->{FEEDBACK} = \%feedback;
1555: $self->{ERROR_MSG} = \%error; # what is this? JB
1556: $self->{DISCUSSION_TIME} = \%discussiontime;
1557: $self->{EMAIL_STATUS} = \%emailstatus;
1558:
1559: }
1560:
1561: $self->{PARM_CACHE} = {};
1.140 bowersj2 1562: $self->{INITED} = 1;
1.133 bowersj2 1563: }
1564:
1565: # Internal function: Takes a key to look up in the nav hash and implements internal
1566: # memory caching of that key.
1567: sub navhash {
1568: my $self = shift; my $key = shift;
1569: return $self->{NAV_HASH}->{$key};
1570: }
1571:
1572: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1573: sub courseMapDefined {
1574: my $self = shift;
1575: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1576:
1577: my $firstres = $self->navhash("map_start_$uri");
1578: my $lastres = $self->navhash("map_finish_$uri");
1579: return $firstres && $lastres;
1580: }
1581:
1582: sub getIterator {
1583: my $self = shift;
1584: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1585: shift, undef, shift);
1586: return $iterator;
1587: }
1588:
1589: # unties the hash when done
1590: sub untieHashes {
1.168 bowersj2 1591: my $self = shift;
1.170 matthew 1592: untie %{$self->{NAV_HASH}};
1593: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1594: }
1595:
1596: # Private method: Does the given resource (as a symb string) have
1597: # current discussion? Returns 0 if chat/mail data not extracted.
1598: sub hasDiscussion {
1599: my $self = shift;
1600: my $symb = shift;
1601: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1602:
1603: #return defined($self->{DISCUSSION_TIME}->{$symb});
1604: return $self->{DISCUSSION_TIME}->{$symb} >
1605: $self->{LAST_CHECK};
1606: }
1607:
1608: # Private method: Does the given resource (as a symb string) have
1609: # current feedback? Returns the string in the feedback hash, which
1610: # will be false if it does not exist.
1611: sub getFeedback {
1612: my $self = shift;
1613: my $symb = shift;
1614:
1615: if (!defined($self->{FEEDBACK})) { return ""; }
1616:
1617: return $self->{FEEDBACK}->{$symb};
1618: }
1619:
1620: # Private method: Get the errors for that resource (by source).
1621: sub getErrors {
1622: my $self = shift;
1623: my $src = shift;
1624:
1625: if (!defined($self->{ERROR_MSG})) { return ""; }
1626: return $self->{ERROR_MSG}->{$src};
1627: }
1628:
1629: =pod
1630:
1.174 ! albertel 1631: =item * B<getById>(id):
! 1632:
! 1633: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
! 1634: object for that resource. This method, or other methods that use it
! 1635: (as in the resource object) is the only proper way to obtain a
! 1636: resource object.
1.133 bowersj2 1637:
1638: =cut
1639:
1640: # The strategy here is to cache the resource objects, and only construct them
1641: # as we use them. The real point is to prevent reading any more from the tied
1642: # hash then we have to, which should hopefully alleviate speed problems.
1643: # Caching is just an incidental detail I throw in because it makes sense.
1644:
1645: sub getById {
1646: my $self = shift;
1647: my $id = shift;
1648:
1649: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1650: {
1651: return $self->{RESOURCE_CACHE}->{$id};
1652: }
1653:
1654: # resource handles inserting itself into cache.
1655: # Not clear why the quotes are necessary, but as of this
1656: # writing it doesn't work without them.
1657: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 1658: }
1.133 bowersj2 1659:
1.172 bowersj2 1660: sub getBySymb {
1661: my $self = shift;
1662: my $symb = shift;
1663: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1664: my $map = $self->getResourceByUrl($mapUrl);
1665: return $self->getById($map->map_pc() . '.' . $id);
1666: }
1667:
1.133 bowersj2 1668: =pod
1669:
1.174 ! albertel 1670: =item * B<firstResource>():
! 1671:
! 1672: Returns a resource object reference corresponding to the first
! 1673: resource in the navmap.
1.133 bowersj2 1674:
1675: =cut
1676:
1677: sub firstResource {
1678: my $self = shift;
1679: my $firstResource = $self->navhash('map_start_' .
1680: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1681: return $self->getById($firstResource);
1.132 bowersj2 1682: }
1.133 bowersj2 1683:
1684: =pod
1685:
1.174 ! albertel 1686: =item * B<finishResource>():
! 1687:
! 1688: Returns a resource object reference corresponding to the last resource
! 1689: in the navmap.
1.133 bowersj2 1690:
1691: =cut
1692:
1693: sub finishResource {
1694: my $self = shift;
1695: my $firstResource = $self->navhash('map_finish_' .
1696: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1697: return $self->getById($firstResource);
1.132 bowersj2 1698: }
1.133 bowersj2 1699:
1700: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1701: # the actual lookup; parmval caches the results.
1702: sub parmval {
1703: my $self = shift;
1704: my ($what,$symb)=@_;
1705: my $hashkey = $what."|||".$symb;
1706:
1707: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1708: return $self->{PARM_CACHE}->{$hashkey};
1709: }
1710:
1711: my $result = $self->parmval_real($what, $symb);
1712: $self->{PARM_CACHE}->{$hashkey} = $result;
1713: return $result;
1.132 bowersj2 1714: }
1715:
1.133 bowersj2 1716: sub parmval_real {
1717: my $self = shift;
1718: my ($what,$symb) = @_;
1719:
1720: my $cid=$ENV{'request.course.id'};
1721: my $csec=$ENV{'request.course.sec'};
1722: my $uname=$ENV{'user.name'};
1723: my $udom=$ENV{'user.domain'};
1724:
1725: unless ($symb) { return ''; }
1726: my $result='';
1727:
1728: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1729:
1730: # ----------------------------------------------------- Cascading lookup scheme
1731: my $rwhat=$what;
1732: $what=~s/^parameter\_//;
1733: $what=~s/\_/\./;
1734:
1735: my $symbparm=$symb.'.'.$what;
1736: my $mapparm=$mapname.'___(all).'.$what;
1737: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1738:
1739: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1740: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1741: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1742:
1743: my $courselevel= $usercourseprefix.'.'.$what;
1744: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1745: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1746:
1747: my $useropt = $self->{USER_OPT};
1748: my $courseopt = $self->{COURSE_OPT};
1749: my $parmhash = $self->{PARM_HASH};
1750:
1751: # ---------------------------------------------------------- first, check user
1752: if ($uname and defined($useropt)) {
1753: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1754: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1755: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1756: }
1757:
1758: # ------------------------------------------------------- second, check course
1759: if ($csec and defined($courseopt)) {
1760: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1761: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1762: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1763: }
1764:
1765: if (defined($courseopt)) {
1766: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1767: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1768: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1769: }
1770:
1771: # ----------------------------------------------------- third, check map parms
1772:
1773: my $thisparm=$$parmhash{$symbparm};
1774: if (defined($thisparm)) { return $thisparm; }
1775:
1776: # ----------------------------------------------------- fourth , check default
1777:
1778: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1779: if (defined($default)) { return $default}
1780:
1781: # --------------------------------------------------- fifth , cascade up parts
1782:
1783: my ($space,@qualifier)=split(/\./,$rwhat);
1784: my $qualifier=join('.',@qualifier);
1785: unless ($space eq '0') {
1.160 albertel 1786: my @parts=split(/_/,$space);
1787: my $id=pop(@parts);
1788: my $part=join('_',@parts);
1789: if ($part eq '') { $part='0'; }
1790: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1791: if (defined($partgeneral)) { return $partgeneral; }
1.133 bowersj2 1792: }
1793: return '';
1.145 bowersj2 1794: }
1795:
1.174 ! albertel 1796: =pod
1.145 bowersj2 1797:
1.174 ! albertel 1798: =item * B<getResourceByUrl>(url):
1.145 bowersj2 1799:
1.174 ! albertel 1800: Retrieves a resource object by URL of the resource. If passed a
! 1801: resource object, it will simply return it, so it is safe to use this
! 1802: method in code like "$res = $navmap->getResourceByUrl($res)", if
! 1803: you're not sure if $res is already an object, or just a URL. If the
! 1804: resource appears multiple times in the course, only the first instance
! 1805: will be returned. As a result, this is probably useful only for maps.
! 1806:
! 1807: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
! 1808:
! 1809: The map is a specification of a map to retreive the resources from,
! 1810: either as a url or as an object. The filterFunc is a reference to a
! 1811: function that takes a resource object as its one argument and returns
! 1812: true if the resource should be included, or false if it should not
! 1813: be. If recursive is true, the map will be recursively examined,
! 1814: otherwise it will not be. If bailout is true, the function will return
! 1815: as soon as it finds a resource, if false it will finish. By default,
! 1816: the map is the top-level map of the course, filterFunc is a function
! 1817: that always returns 1, recursive is true, bailout is false. The
! 1818: resources will be returned in a list containing the resource objects
! 1819: for the corresponding resources, with B<no structure information> in
! 1820: the list; regardless of branching, recursion, etc., it will be a flat
! 1821: list.
! 1822:
! 1823: Thus, this is suitable for cases where you don't want the structure,
! 1824: just a list of all resources. It is also suitable for finding out how
! 1825: many resources match a given description; for this use, if all you
! 1826: want to know is if I<any> resources match the description, the bailout
! 1827: parameter will allow you to avoid potentially expensive enumeration of
! 1828: all matching resources.
1.145 bowersj2 1829:
1.174 ! albertel 1830: =item * B<hasResources>(map, filterFunc, recursive):
1.145 bowersj2 1831:
1.174 ! albertel 1832: Convience method for
1.146 bowersj2 1833:
1834: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
1835:
1.174 ! albertel 1836: which will tell whether the map has resources matching the description
! 1837: in the filter function.
1.146 bowersj2 1838:
1.145 bowersj2 1839: =cut
1840:
1841: sub getResourceByUrl {
1842: my $self = shift;
1843: my $resUrl = shift;
1844:
1845: if (ref($resUrl)) { return $resUrl; }
1846:
1847: $resUrl = &Apache::lonnet::clutter($resUrl);
1848: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1849: if ($resId =~ /,/) {
1850: $resId = (split (/,/, $resId))[0];
1851: }
1852: if (!$resId) { return ''; }
1853: return $self->getById($resId);
1854: }
1855:
1856: sub retrieveResources {
1857: my $self = shift;
1858: my $map = shift;
1859: my $filterFunc = shift;
1860: if (!defined ($filterFunc)) {
1861: $filterFunc = sub {return 1;};
1862: }
1863: my $recursive = shift;
1864: if (!defined($recursive)) { $recursive = 1; }
1865: my $bailout = shift;
1866: if (!defined($bailout)) { $bailout = 0; }
1867:
1868: # Create the necessary iterator.
1869: if (!ref($map)) { # assume it's a url of a map.
1.172 bowersj2 1870: $map = $self->getResourceByUrl($map);
1.145 bowersj2 1871: }
1872:
1873: # Check the map's validity.
1874: if (!$map || !$map->is_map()) {
1875: # Oh, to throw an exception.... how I'd love that!
1876: return ();
1877: }
1878:
1.146 bowersj2 1879: # Get an iterator.
1880: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1881: !$recursive);
1882:
1883: my @resources = ();
1884:
1885: # Run down the iterator and collect the resources.
1886: my $depth = 1;
1887: $it->next();
1888: my $curRes = $it->next();
1889:
1890: while ($depth > 0) {
1891: if ($curRes == $it->BEGIN_MAP()) {
1892: $depth++;
1893: }
1894: if ($curRes == $it->END_MAP()) {
1895: $depth--;
1896: }
1897:
1898: if (ref($curRes)) {
1899: if (!&$filterFunc($curRes)) {
1900: next;
1901: }
1902:
1903: push @resources, $curRes;
1904:
1905: if ($bailout) {
1906: return @resources;
1907: }
1908: }
1909:
1910: $curRes = $it->next();
1911: }
1912:
1913: return @resources;
1914: }
1915:
1916: sub hasResource {
1917: my $self = shift;
1918: my $map = shift;
1919: my $filterFunc = shift;
1920: my $recursive = shift;
1921:
1922: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133 bowersj2 1923: }
1.51 bowersj2 1924:
1925: 1;
1926:
1927: package Apache::lonnavmaps::iterator;
1928:
1929: =pod
1930:
1931: =back
1932:
1.174 ! albertel 1933: =head1 Object: navmap Iterator
1.51 bowersj2 1934:
1.174 ! albertel 1935: An I<iterator> encapsulates the logic required to traverse a data
! 1936: structure. navmap uses an iterator to traverse the course map
! 1937: according to the criteria you wish to use.
! 1938:
! 1939: To obtain an iterator, call the B<getIterator>() function of a
! 1940: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
! 1941: directly.) This will return a reference to the iterator:
1.51 bowersj2 1942:
1943: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1944:
1945: To get the next thing from the iterator, call B<next>:
1946:
1947: C<my $nextThing = $resourceIterator-E<gt>next()>
1948:
1949: getIterator behaves as follows:
1950:
1951: =over 4
1952:
1.174 ! albertel 1953: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
! 1954:
! 1955: All parameters are optional. firstResource is a resource reference
! 1956: corresponding to where the iterator should start. It defaults to
! 1957: navmap->firstResource() for the corresponding nav map. finishResource
! 1958: corresponds to where you want the iterator to end, defaulting to
! 1959: navmap->finishResource(). filterHash is a hash used as a set
! 1960: containing strings representing the resource IDs, defaulting to
! 1961: empty. Condition is a 1 or 0 that sets what to do with the filter
! 1962: hash: If a 0, then only resource that exist IN the filterHash will be
! 1963: recursed on. If it is a 1, only resources NOT in the filterHash will
! 1964: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
! 1965: false (default), the iterator will only return the first level of map
! 1966: that is not just a single, 'redirecting' map. If true, the iterator
! 1967: will return all information, starting with the top-level map,
! 1968: regardless of content. returnTopMap, if true (default false), will
! 1969: cause the iterator to return the top-level map object (resource 0.0)
! 1970: before anything else.
! 1971:
! 1972: Thus, by default, only top-level resources will be shown. Change the
! 1973: condition to a 1 without changing the hash, and all resources will be
! 1974: shown. Changing the condition to 1 and including some values in the
! 1975: hash will allow you to selectively suppress parts of the navmap, while
! 1976: leaving it on 0 and adding things to the hash will allow you to
! 1977: selectively add parts of the nav map. See the handler code for
! 1978: examples.
! 1979:
! 1980: The iterator will return either a reference to a resource object, or a
! 1981: token representing something in the map, such as the beginning of a
! 1982: new branch. The possible tokens are:
! 1983:
! 1984: =over 4
1.51 bowersj2 1985:
1.174 ! albertel 1986: =item * BEGIN_MAP:
1.51 bowersj2 1987:
1.174 ! albertel 1988: A new map is being recursed into. This is returned I<after> the map
! 1989: resource itself is returned.
1.51 bowersj2 1990:
1.174 ! albertel 1991: =item * END_MAP:
! 1992:
! 1993: The map is now done.
1.51 bowersj2 1994:
1.174 ! albertel 1995: =item * BEGIN_BRANCH:
1.70 bowersj2 1996:
1.174 ! albertel 1997: A branch is now starting. The next resource returned will be the first
! 1998: in that branch.
1.70 bowersj2 1999:
1.174 ! albertel 2000: =item * END_BRANCH:
1.70 bowersj2 2001:
1.174 ! albertel 2002: The branch is now done.
1.51 bowersj2 2003:
2004: =back
2005:
1.174 ! albertel 2006: The tokens are retreivable via methods on the iterator object, i.e.,
! 2007: $iterator->END_MAP.
1.70 bowersj2 2008:
1.174 ! albertel 2009: Maps can contain empty resources. The iterator will automatically skip
! 2010: over such resources, but will still treat the structure
! 2011: correctly. Thus, a complicated map with several branches, but
! 2012: consisting entirely of empty resources except for one beginning or
! 2013: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
! 2014: but only one resource will be returned.
1.116 bowersj2 2015:
1.70 bowersj2 2016: =back
1.51 bowersj2 2017:
2018: =cut
2019:
2020: # Here are the tokens for the iterator:
2021:
2022: sub BEGIN_MAP { return 1; } # begining of a new map
2023: sub END_MAP { return 2; } # end of the map
2024: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2025: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 2026: sub FORWARD { return 1; } # go forward
2027: sub BACKWARD { return 2; }
1.51 bowersj2 2028:
1.96 bowersj2 2029: sub min {
2030: (my $a, my $b) = @_;
2031: if ($a < $b) { return $a; } else { return $b; }
2032: }
2033:
1.107 bowersj2 2034: # In the CVS repository, documentation of this algorithm is included
2035: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
2036: # will reference the same location in the text as the part of the
2037: # algorithm is running through.
2038:
1.94 bowersj2 2039: sub new {
2040: # magic invocation to create a class instance
2041: my $proto = shift;
2042: my $class = ref($proto) || $proto;
2043: my $self = {};
2044:
2045: $self->{NAV_MAP} = shift;
2046: return undef unless ($self->{NAV_MAP});
2047:
2048: # Handle the parameters
2049: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2050: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2051:
2052: # If the given resources are just the ID of the resource, get the
2053: # objects
2054: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2055: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2056: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2057: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2058:
2059: $self->{FILTER} = shift;
2060:
2061: # A hash, used as a set, of resource already seen
2062: $self->{ALREADY_SEEN} = shift;
2063: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2064: $self->{CONDITION} = shift;
2065:
1.116 bowersj2 2066: # Do we want to automatically follow "redirection" maps?
2067: $self->{FORCE_TOP} = shift;
2068:
1.162 bowersj2 2069: # Do we want to return the top-level map object (resource 0.0)?
2070: $self->{RETURN_0} = shift;
2071: # have we done that yet?
2072: $self->{HAVE_RETURNED_0} = 0;
2073:
1.94 bowersj2 2074: # Now, we need to pre-process the map, by walking forward and backward
2075: # over the parts of the map we're going to look at.
1.96 bowersj2 2076:
1.97 bowersj2 2077: # The processing steps are exactly the same, except for a few small
2078: # changes, so I bundle those up in the following list of two elements:
2079: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2080: # first_resource).
2081: # This prevents writing nearly-identical code twice.
2082: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2083: 'FIRST_RESOURCE'],
2084: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2085: 'FINISH_RESOURCE'] );
2086:
1.98 bowersj2 2087: my $maxDepth = 0; # tracks max depth
2088:
1.116 bowersj2 2089: # If there is only one resource in this map, and it's a map, we
2090: # want to remember that, so the user can ask for the first map
2091: # that isn't just a redirector.
2092: my $resource; my $resourceCount = 0;
2093:
1.107 bowersj2 2094: # **1**
2095:
1.97 bowersj2 2096: foreach my $pass (@iterations) {
2097: my $direction = $pass->[0];
2098: my $valName = $pass->[1];
2099: my $nextResourceMethod = $pass->[2];
2100: my $firstResourceName = $pass->[3];
2101:
2102: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2103: $self->{FIRST_RESOURCE},
2104: $self->{FINISH_RESOURCE},
2105: {}, undef, 0, $direction);
1.96 bowersj2 2106:
1.97 bowersj2 2107: # prime the recursion
2108: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 2109: my $depth = 0;
1.97 bowersj2 2110: $iterator->next();
2111: my $curRes = $iterator->next();
1.98 bowersj2 2112: while ($depth > -1) {
1.97 bowersj2 2113: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2114: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 2115:
1.97 bowersj2 2116: if (ref($curRes)) {
1.116 bowersj2 2117: # If there's only one resource, this will save it
1.117 bowersj2 2118: # we have to filter empty resources from consideration here,
2119: # or even "empty", redirecting maps have two (start & finish)
2120: # or three (start, finish, plus redirector)
2121: if($direction == FORWARD && $curRes->src()) {
2122: $resource = $curRes; $resourceCount++;
2123: }
1.97 bowersj2 2124: my $resultingVal = $curRes->{DATA}->{$valName};
2125: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 2126: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 2127:
1.116 bowersj2 2128: if ($nextCount == 1) { # **3**
1.97 bowersj2 2129: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2130: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2131: }
2132:
1.116 bowersj2 2133: if ($nextCount > 1) { # **4**
1.97 bowersj2 2134: foreach my $res (@{$nextResources}) {
2135: my $current = $res->{DATA}->{$valName} || 999999999;
2136: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2137: }
2138: }
2139: }
1.96 bowersj2 2140:
1.107 bowersj2 2141: # Assign the final val (**2**)
1.97 bowersj2 2142: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 2143: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2144: $curRes->{DATA}->{BOT_UP_VAL});
2145:
2146: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2147: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2148: }
1.97 bowersj2 2149: $curRes = $iterator->next();
1.96 bowersj2 2150: }
2151: }
1.94 bowersj2 2152:
1.116 bowersj2 2153: # Check: Was this only one resource, a map?
2154: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2155: my $firstResource = $resource->map_start();
2156: my $finishResource = $resource->map_finish();
2157: return
2158: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2159: $finishResource, $self->{FILTER},
2160: $self->{ALREADY_SEEN},
2161: $self->{CONDITION}, 0);
2162:
2163: }
2164:
1.98 bowersj2 2165: # Set up some bookkeeping information.
2166: $self->{CURRENT_DEPTH} = 0;
2167: $self->{MAX_DEPTH} = $maxDepth;
2168: $self->{STACK} = [];
2169: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2170:
2171: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2172: push @{$self->{STACK}}, [];
2173: }
2174:
1.107 bowersj2 2175: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 2176: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2177: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2178:
2179: bless ($self);
2180:
2181: return $self;
2182: }
2183:
2184: sub next {
2185: my $self = shift;
1.162 bowersj2 2186:
2187: # If we want to return the top-level map object, and haven't yet,
2188: # do so.
2189: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2190: $self->{HAVE_RETURNED_0} = 1;
2191: return $self->{NAV_MAP}->getById('0.0');
2192: }
1.98 bowersj2 2193:
2194: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2195: # grab the next from the recursive iterator
2196: my $next = $self->{RECURSIVE_ITERATOR}->next();
2197:
2198: # is it a begin or end map? If so, update the depth
2199: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2200: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2201:
2202: # Are we back at depth 0? If so, stop recursing
2203: if ($self->{RECURSIVE_DEPTH} == 0) {
2204: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2205: }
2206:
2207: return $next;
2208: }
2209:
2210: if (defined($self->{FORCE_NEXT})) {
2211: my $tmp = $self->{FORCE_NEXT};
2212: $self->{FORCE_NEXT} = undef;
2213: return $tmp;
2214: }
2215:
2216: # Have we not yet begun? If not, return BEGIN_MAP and
2217: # remember we've started.
2218: if ( !$self->{STARTED} ) {
2219: $self->{STARTED} = 1;
2220: return $self->BEGIN_MAP();
2221: }
2222:
2223: # Here's the guts of the iterator.
2224:
2225: # Find the next resource, if any.
2226: my $found = 0;
2227: my $i = $self->{MAX_DEPTH};
2228: my $newDepth;
2229: my $here;
2230: while ( $i >= 0 && !$found ) {
1.107 bowersj2 2231: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2232: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 2233: $found = 1;
2234: $newDepth = $i;
2235: }
2236: $i--;
2237: }
2238:
2239: # If we still didn't find anything, we're done.
2240: if ( !$found ) {
2241: # We need to get back down to the correct branch depth
2242: if ( $self->{CURRENT_DEPTH} > 0 ) {
2243: $self->{CURRENT_DEPTH}--;
2244: return END_BRANCH();
2245: } else {
2246: return END_MAP();
2247: }
2248: }
2249:
1.104 bowersj2 2250: # If this is not a resource, it must be an END_BRANCH marker we want
2251: # to return directly.
1.107 bowersj2 2252: if (!ref($here)) { # **8**
1.104 bowersj2 2253: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2254: $self->{CURRENT_DEPTH}--;
2255: return $here;
2256: }
2257: }
2258:
2259: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2260: $self->{HERE} = $here;
2261:
1.98 bowersj2 2262: # Get to the right level
2263: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2264: push @{$self->{STACK}->[$newDepth]}, $here;
2265: $self->{CURRENT_DEPTH}--;
2266: return END_BRANCH();
2267: }
2268: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2269: push @{$self->{STACK}->[$newDepth]}, $here;
2270: $self->{CURRENT_DEPTH}++;
2271: return BEGIN_BRANCH();
2272: }
2273:
2274: # If we made it here, we have the next resource, and we're at the
2275: # right branch level. So let's examine the resource for where
2276: # we can get to from here.
2277:
2278: # So we need to look at all the resources we can get to from here,
2279: # categorize them if we haven't seen them, remember if we have a new
2280: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 2281: my $maxDepthAdded = -1;
2282:
1.98 bowersj2 2283: for (@$nextUnfiltered) {
2284: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 2285: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2286: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 2287: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 2288: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 2289: }
2290: }
1.104 bowersj2 2291:
2292: # Is this the end of a branch? If so, all of the resources examined above
2293: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2294: # marker onto the stack so we don't forget.
2295: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2296: # BC branch and gets to C, it will see F as the only next resource, but it's
2297: # one level lower. Thus, this is the end of the branch, since there are no
2298: # more resources added to this level or above.
1.111 bowersj2 2299: # We don't do this if the examined resource is the finish resource,
2300: # because the condition given above is true, but the "END_MAP" will
2301: # take care of things and we should already be at depth 0.
1.104 bowersj2 2302: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 2303: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 2304: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2305: }
2306:
1.98 bowersj2 2307: # That ends the main iterator logic. Now, do we want to recurse
2308: # down this map (if this resource is a map)?
2309: if ($self->{HERE}->is_map() &&
2310: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2311: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2312: my $firstResource = $self->{HERE}->map_start();
2313: my $finishResource = $self->{HERE}->map_finish();
2314:
2315: $self->{RECURSIVE_ITERATOR} =
2316: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2317: $finishResource, $self->{FILTER},
2318: $self->{ALREADY_SEEN}, $self->{CONDITION});
2319: }
2320:
1.116 bowersj2 2321: # If this is a blank resource, don't actually return it.
1.117 bowersj2 2322: # Should you ever find you need it, make sure to add an option to the code
2323: # that you can use; other things depend on this behavior.
1.138 bowersj2 2324: my $browsePriv = $self->{HERE}->browsePriv();
2325: if (!$self->{HERE}->src() ||
2326: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.116 bowersj2 2327: return $self->next();
2328: }
2329:
1.98 bowersj2 2330: return $self->{HERE};
2331:
2332: }
2333:
2334: =pod
2335:
1.174 ! albertel 2336: The other method available on the iterator is B<getStack>, which
! 2337: returns an array populated with the current 'stack' of maps, as
! 2338: references to the resource objects. Example: This is useful when
! 2339: making the navigation map, as we need to check whether we are under a
! 2340: page map to see if we need to link directly to the resource, or to the
! 2341: page. The first elements in the array will correspond to the top of
! 2342: the stack (most inclusive map).
1.98 bowersj2 2343:
2344: =cut
2345:
2346: sub getStack {
2347: my $self=shift;
2348:
2349: my @stack;
2350:
2351: $self->populateStack(\@stack);
2352:
2353: return \@stack;
2354: }
2355:
2356: # Private method: Calls the iterators recursively to populate the stack.
2357: sub populateStack {
2358: my $self=shift;
2359: my $stack = shift;
2360:
2361: push @$stack, $self->{HERE} if ($self->{HERE});
2362:
2363: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2364: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2365: }
1.94 bowersj2 2366: }
2367:
2368: 1;
2369:
2370: package Apache::lonnavmaps::DFSiterator;
2371:
1.100 bowersj2 2372: # Not documented in the perldoc: This is a simple iterator that just walks
2373: # through the nav map and presents the resources in a depth-first search
2374: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2375: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2376: # useful for pre-processing of some kind, and is in fact used by the main
2377: # iterator that way, but that's about it.
2378: # One could imagine merging this into the init routine of the main iterator,
2379: # but this might as well be left seperate, since it is possible some other
2380: # use might be found for it. - Jeremy
1.94 bowersj2 2381:
1.117 bowersj2 2382: # Unlike the main iterator, this DOES return all resources, even blank ones.
2383: # The main iterator needs them to correctly preprocess the map.
2384:
1.94 bowersj2 2385: sub BEGIN_MAP { return 1; } # begining of a new map
2386: sub END_MAP { return 2; } # end of the map
2387: sub FORWARD { return 1; } # go forward
2388: sub BACKWARD { return 2; }
2389:
1.100 bowersj2 2390: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2391: # filter hash ref (or undef), already seen hash or undef, condition
2392: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 2393: sub new {
2394: # magic invocation to create a class instance
2395: my $proto = shift;
2396: my $class = ref($proto) || $proto;
2397: my $self = {};
2398:
2399: $self->{NAV_MAP} = shift;
2400: return undef unless ($self->{NAV_MAP});
2401:
2402: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2403: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2404:
2405: # If the given resources are just the ID of the resource, get the
2406: # objects
2407: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2408: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2409: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2410: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2411:
2412: $self->{FILTER} = shift;
2413:
2414: # A hash, used as a set, of resource already seen
2415: $self->{ALREADY_SEEN} = shift;
1.140 bowersj2 2416: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2417: $self->{CONDITION} = shift;
1.89 bowersj2 2418: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2419:
1.100 bowersj2 2420: # Flag: Have we started yet?
1.51 bowersj2 2421: $self->{STARTED} = 0;
2422:
2423: # Should we continue calling the recursive iterator, if any?
2424: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2425: # The recursive iterator, if any
2426: $self->{RECURSIVE_ITERATOR} = undef;
2427: # Are we recursing on a map, or a branch?
2428: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2429: # And the count of how deep it is, so that this iterator can keep track of
2430: # when to pick back up again.
2431: $self->{RECURSIVE_DEPTH} = 0;
2432:
2433: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2434: $self->{STACK} = [];
1.51 bowersj2 2435:
2436: # Start with the first resource
1.89 bowersj2 2437: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2438: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2439: } else {
1.100 bowersj2 2440: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2441: }
1.51 bowersj2 2442:
2443: bless($self);
2444: return $self;
2445: }
2446:
2447: sub next {
2448: my $self = shift;
2449:
2450: # Are we using a recursive iterator? If so, pull from that and
2451: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2452: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2453: # grab the next from the recursive iterator
2454: my $next = $self->{RECURSIVE_ITERATOR}->next();
2455:
2456: # is it a begin or end map? Update depth if so
2457: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2458: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2459:
2460: # Are we back at depth 0? If so, stop recursing.
2461: if ($self->{RECURSIVE_DEPTH} == 0) {
2462: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2463: }
2464:
2465: return $next;
2466: }
2467:
2468: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2469: # END_MAP, which will end the iterator.
2470: if (scalar(@{$self->{STACK}}) == 0) {
2471: return $self->END_MAP();
1.51 bowersj2 2472: }
2473:
2474: # Have we not yet begun? If not, return BEGIN_MAP and
2475: # remember that we've started.
2476: if ( !$self->{STARTED} ) {
2477: $self->{STARTED} = 1;
2478: return $self->BEGIN_MAP;
2479: }
2480:
2481: # Get the next resource in the branch
1.100 bowersj2 2482: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2483:
1.100 bowersj2 2484: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2485: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2486:
2487: # Get the next possible resources
1.90 bowersj2 2488: my $nextUnfiltered;
1.89 bowersj2 2489: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2490: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2491: } else {
1.90 bowersj2 2492: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2493: }
1.51 bowersj2 2494: my $next = [];
2495:
2496: # filter the next possibilities to remove things we've
1.100 bowersj2 2497: # already seen.
1.51 bowersj2 2498: foreach (@$nextUnfiltered) {
1.52 bowersj2 2499: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2500: push @$next, $_;
2501: }
1.51 bowersj2 2502: }
2503:
2504: while (@$next) {
1.100 bowersj2 2505: # copy the next possibilities over to the stack
2506: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2507: }
2508:
2509: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2510: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2511: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2512: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2513: my $firstResource = $self->{HERE}->map_start();
2514: my $finishResource = $self->{HERE}->map_finish();
2515:
2516: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2517: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2518: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2519: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2520: }
2521:
2522: return $self->{HERE};
2523: }
2524:
1.1 www 2525: 1;
1.2 www 2526:
1.51 bowersj2 2527: package Apache::lonnavmaps::resource;
2528:
2529: use Apache::lonnet;
2530:
2531: =pod
2532:
2533: =head1 Object: resource
2534:
1.174 ! albertel 2535: A resource object encapsulates a resource in a resource map, allowing
! 2536: easy manipulation of the resource, querying the properties of the
! 2537: resource (including user properties), and represents a reference that
! 2538: can be used as the canonical representation of the resource by
! 2539: lonnavmap clients like renderers.
! 2540:
! 2541: A resource only makes sense in the context of a navmap, as some of the
! 2542: data is stored in the navmap object.
! 2543:
! 2544: You will probably never need to instantiate this object directly. Use
! 2545: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
! 2546: starting resource.
1.51 bowersj2 2547:
2548: =head2 Public Members
2549:
1.174 ! albertel 2550: resource objects have a hash called DATA ($resourceRef->{DATA}) that
! 2551: you can store whatever you want in. This allows you to easily do
! 2552: two-pass algorithms without worrying about managing your own
! 2553: resource->data hash.
1.51 bowersj2 2554:
2555: =head2 Methods
2556:
2557: =over 4
2558:
1.174 ! albertel 2559: =item * B<new>($navmapRef, $idString):
! 2560:
! 2561: The first arg is a reference to the parent navmap object. The second
! 2562: is the idString of the resource itself. Very rarely, if ever, called
! 2563: directly. Use the nav map->getByID() method.
1.70 bowersj2 2564:
2565: =back
1.51 bowersj2 2566:
2567: =cut
2568:
2569: sub new {
2570: # magic invocation to create a class instance
2571: my $proto = shift;
2572: my $class = ref($proto) || $proto;
2573: my $self = {};
2574:
2575: $self->{NAV_MAP} = shift;
2576: $self->{ID} = shift;
2577:
2578: # Store this new resource in the parent nav map's cache.
2579: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 2580: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 2581:
2582: # A hash that can be used by two-pass algorithms to store data
2583: # about this resource in. Not used by the resource object
2584: # directly.
2585: $self->{DATA} = {};
2586:
2587: bless($self);
2588:
2589: return $self;
2590: }
2591:
1.70 bowersj2 2592: # private function: simplify the NAV_HASH lookups we keep doing
2593: # pass the name, and to automatically append my ID, pass a true val on the
2594: # second param
2595: sub navHash {
2596: my $self = shift;
2597: my $param = shift;
2598: my $id = shift;
1.115 bowersj2 2599: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 2600: }
2601:
1.51 bowersj2 2602: =pod
2603:
1.70 bowersj2 2604: B<Metadata Retreival>
2605:
1.174 ! albertel 2606: These are methods that help you retrieve metadata about the resource:
! 2607: Method names are based on the fields in the compiled course
! 2608: representation.
1.70 bowersj2 2609:
2610: =over 4
2611:
1.174 ! albertel 2612: =item * B<compTitle>:
! 2613:
! 2614: Returns a "composite title", that is equal to $res->title() if the
! 2615: resource has a title, and is otherwise the last part of the URL (e.g.,
! 2616: "problem.problem").
! 2617:
! 2618: =item * B<ext>:
! 2619:
! 2620: Returns true if the resource is external.
! 2621:
! 2622: =item * B<goesto>:
! 2623:
! 2624: Returns the "goesto" value from the compiled nav map. (It is likely
! 2625: you want to use B<getNext> instead.)
! 2626:
! 2627: =item * B<kind>:
! 2628:
! 2629: Returns the kind of the resource from the compiled nav map.
! 2630:
! 2631: =item * B<randomout>:
1.106 bowersj2 2632:
1.174 ! albertel 2633: Returns true if this resource was chosen to NOT be shown to the user
! 2634: by the random map selection feature. In other words, this is usually
! 2635: false.
1.70 bowersj2 2636:
1.174 ! albertel 2637: =item * B<randompick>:
1.70 bowersj2 2638:
1.174 ! albertel 2639: Returns true for a map if the randompick feature is being used on the
! 2640: map. (?)
1.70 bowersj2 2641:
1.174 ! albertel 2642: =item * B<src>:
1.51 bowersj2 2643:
1.174 ! albertel 2644: Returns the source for the resource.
1.70 bowersj2 2645:
1.174 ! albertel 2646: =item * B<symb>:
1.70 bowersj2 2647:
1.174 ! albertel 2648: Returns the symb for the resource.
1.70 bowersj2 2649:
1.174 ! albertel 2650: =item * B<title>:
1.70 bowersj2 2651:
1.174 ! albertel 2652: Returns the title of the resource.
! 2653:
! 2654: =item * B<to>:
! 2655:
! 2656: Returns the "to" value from the compiled nav map. (It is likely you
! 2657: want to use B<getNext> instead.)
1.51 bowersj2 2658:
2659: =back
2660:
2661: =cut
2662:
2663: # These info functions can be used directly, as they don't return
2664: # resource information.
1.85 bowersj2 2665: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 2666: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 2667: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 2668: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2669: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 2670: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2671: sub randompick {
2672: my $self = shift;
2673: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2674: '.0.parameter_randompick'};
2675: }
1.51 bowersj2 2676: sub src {
2677: my $self=shift;
2678: return $self->navHash("src_", 1);
2679: }
2680: sub symb {
2681: my $self=shift;
2682: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2683: my $symbSrc = &Apache::lonnet::declutter($self->src());
2684: return &Apache::lonnet::declutter(
2685: $self->navHash('map_id_'.$first))
2686: . '___' . $second . '___' . $symbSrc;
2687: }
1.70 bowersj2 2688: sub title { my $self=shift; return $self->navHash("title_", 1); }
2689: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 2690: sub compTitle {
2691: my $self = shift;
2692: my $title = $self->title();
2693: if (!$title) {
2694: $title = $self->src();
2695: $title = substr($title, rindex($title, '/') + 1);
2696: }
2697: return $title;
2698: }
1.70 bowersj2 2699: =pod
2700:
2701: B<Predicate Testing the Resource>
2702:
2703: These methods are shortcuts to deciding if a given resource has a given property.
2704:
2705: =over 4
2706:
1.174 ! albertel 2707: =item * B<is_map>:
! 2708:
! 2709: Returns true if the resource is a map type.
! 2710:
! 2711: =item * B<is_problem>:
1.70 bowersj2 2712:
1.174 ! albertel 2713: Returns true if the resource is a problem type, false
! 2714: otherwise. (Looks at the extension on the src field; might need more
! 2715: to work correctly.)
1.70 bowersj2 2716:
1.174 ! albertel 2717: =item * B<is_page>:
1.70 bowersj2 2718:
1.174 ! albertel 2719: Returns true if the resource is a page.
! 2720:
! 2721: =item * B<is_sequence>:
! 2722:
! 2723: Returns true if the resource is a sequence.
1.70 bowersj2 2724:
2725: =back
2726:
2727: =cut
2728:
2729:
2730: sub is_html {
1.51 bowersj2 2731: my $self=shift;
2732: my $src = $self->src();
1.70 bowersj2 2733: return ($src =~ /html$/);
1.51 bowersj2 2734: }
1.70 bowersj2 2735: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2736: sub is_page {
1.51 bowersj2 2737: my $self=shift;
2738: my $src = $self->src();
1.70 bowersj2 2739: return ($src =~ /page$/);
1.51 bowersj2 2740: }
1.70 bowersj2 2741: sub is_problem {
1.51 bowersj2 2742: my $self=shift;
2743: my $src = $self->src();
1.70 bowersj2 2744: return ($src =~ /problem$/);
1.51 bowersj2 2745: }
1.70 bowersj2 2746: sub is_sequence {
1.51 bowersj2 2747: my $self=shift;
2748: my $src = $self->src();
1.70 bowersj2 2749: return ($src =~ /sequence$/);
1.51 bowersj2 2750: }
2751:
1.101 bowersj2 2752: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2753: sub parmval {
2754: my $self = shift;
2755: my $what = shift;
2756: my $part = shift || "0";
2757: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2758: }
2759:
1.70 bowersj2 2760: =pod
2761:
2762: B<Map Methods>
2763:
1.174 ! albertel 2764: These methods are useful for getting information about the map
! 2765: properties of the resource, if the resource is a map (B<is_map>).
1.70 bowersj2 2766:
2767: =over 4
2768:
1.174 ! albertel 2769: =item * B<map_finish>:
! 2770:
! 2771: Returns a reference to a resource object corresponding to the finish
! 2772: resource of the map.
1.70 bowersj2 2773:
1.174 ! albertel 2774: =item * B<map_pc>:
1.70 bowersj2 2775:
1.174 ! albertel 2776: Returns the pc value of the map, which is the first number that
! 2777: appears in the resource ID of the resources in the map, and is the
! 2778: number that appears around the middle of the symbs of the resources in
! 2779: that map.
1.70 bowersj2 2780:
1.174 ! albertel 2781: =item * B<map_start>:
! 2782:
! 2783: Returns a reference to a resource object corresponding to the start
! 2784: resource of the map.
! 2785:
! 2786: =item * B<map_type>:
! 2787:
! 2788: Returns a string with the type of the map in it.
1.70 bowersj2 2789:
2790: =back
1.51 bowersj2 2791:
1.70 bowersj2 2792: =cut
1.51 bowersj2 2793:
2794: sub map_finish {
2795: my $self = shift;
2796: my $src = $self->src();
1.144 bowersj2 2797: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 2798: my $res = $self->navHash("map_finish_$src", 0);
2799: $res = $self->{NAV_MAP}->getById($res);
2800: return $res;
2801: }
1.70 bowersj2 2802: sub map_pc {
2803: my $self = shift;
2804: my $src = $self->src();
2805: return $self->navHash("map_pc_$src", 0);
2806: }
1.51 bowersj2 2807: sub map_start {
2808: my $self = shift;
2809: my $src = $self->src();
1.144 bowersj2 2810: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 2811: my $res = $self->navHash("map_start_$src", 0);
2812: $res = $self->{NAV_MAP}->getById($res);
2813: return $res;
2814: }
2815: sub map_type {
2816: my $self = shift;
2817: my $pc = $self->map_pc();
2818: return $self->navHash("map_type_$pc", 0);
2819: }
2820:
2821:
2822:
2823: #####
2824: # Property queries
2825: #####
2826:
2827: # These functions will be responsible for returning the CORRECT
2828: # VALUE for the parameter, no matter what. So while they may look
2829: # like direct calls to parmval, they can be more then that.
2830: # So, for instance, the duedate function should use the "duedatetype"
2831: # information, rather then the resource object user.
2832:
2833: =pod
2834:
2835: =head2 Resource Parameters
2836:
1.174 ! albertel 2837: In order to use the resource parameters correctly, the nav map must
! 2838: have been instantiated with genCourseAndUserOptions set to true, so
! 2839: the courseopt and useropt is read correctly. Then, you can call these
! 2840: functions to get the relevant parameters for the resource. Each
! 2841: function defaults to part "0", but can be directed to another part by
! 2842: passing the part as the parameter.
! 2843:
! 2844: These methods are responsible for getting the parameter correct, not
! 2845: merely reflecting the contents of the GDBM hashes. As we move towards
! 2846: dates relative to other dates, these methods should be updated to
! 2847: reflect that. (Then, anybody using these methods will not have to update
! 2848: their code.)
! 2849:
! 2850: =over 4
! 2851:
! 2852: =item * B<acc>:
! 2853:
! 2854: Get the Client IP/Name Access Control information.
1.51 bowersj2 2855:
1.174 ! albertel 2856: =item * B<answerdate>:
1.51 bowersj2 2857:
1.174 ! albertel 2858: Get the answer-reveal date for the problem.
! 2859:
! 2860: =item * B<duedate>:
! 2861:
! 2862: Get the due date for the problem.
! 2863:
! 2864: =item * B<tries>:
! 2865:
! 2866: Get the number of tries the student has used on the problem.
! 2867:
! 2868: =item * B<maxtries>:
! 2869:
! 2870: Get the number of max tries allowed.
! 2871:
! 2872: =item * B<opendate>:
1.51 bowersj2 2873:
1.174 ! albertel 2874: Get the open date for the problem.
1.51 bowersj2 2875:
1.174 ! albertel 2876: =item * B<sig>:
1.51 bowersj2 2877:
1.174 ! albertel 2878: Get the significant figures setting.
1.51 bowersj2 2879:
1.174 ! albertel 2880: =item * B<tol>:
1.51 bowersj2 2881:
1.174 ! albertel 2882: Get the tolerance for the problem.
1.51 bowersj2 2883:
1.174 ! albertel 2884: =item * B<tries>:
1.51 bowersj2 2885:
1.174 ! albertel 2886: Get the number of tries the user has already used on the problem.
1.51 bowersj2 2887:
1.174 ! albertel 2888: =item * B<type>:
1.51 bowersj2 2889:
1.174 ! albertel 2890: Get the question type for the problem.
1.70 bowersj2 2891:
1.174 ! albertel 2892: =item * B<weight>:
1.51 bowersj2 2893:
1.174 ! albertel 2894: Get the weight for the problem.
1.51 bowersj2 2895:
2896: =back
2897:
2898: =cut
2899:
2900: sub acc {
2901: (my $self, my $part) = @_;
2902: return $self->parmval("acc", $part);
2903: }
2904: sub answerdate {
2905: (my $self, my $part) = @_;
2906: # Handle intervals
2907: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2908: return $self->duedate($part) +
2909: $self->parmval("answerdate", $part);
2910: }
2911: return $self->parmval("answerdate", $part);
1.106 bowersj2 2912: }
1.108 bowersj2 2913: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2914: sub duedate {
2915: (my $self, my $part) = @_;
2916: return $self->parmval("duedate", $part);
2917: }
2918: sub maxtries {
2919: (my $self, my $part) = @_;
2920: return $self->parmval("maxtries", $part);
2921: }
2922: sub opendate {
2923: (my $self, my $part) = @_;
2924: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2925: return $self->duedate($part) -
2926: $self->parmval("opendate", $part);
2927: }
2928: return $self->parmval("opendate");
2929: }
2930: sub sig {
2931: (my $self, my $part) = @_;
2932: return $self->parmval("sig", $part);
2933: }
2934: sub tol {
2935: (my $self, my $part) = @_;
2936: return $self->parmval("tol", $part);
2937: }
1.108 bowersj2 2938: sub tries {
2939: my $self = shift;
2940: my $tries = $self->queryRestoreHash('tries', shift);
2941: if (!defined($tries)) { return '0';}
1.51 bowersj2 2942: return $tries;
2943: }
1.70 bowersj2 2944: sub type {
2945: (my $self, my $part) = @_;
2946: return $self->parmval("type", $part);
2947: }
1.109 bowersj2 2948: sub weight {
2949: my $self = shift; my $part = shift;
1.70 bowersj2 2950: return $self->parmval("weight", $part);
2951: }
1.51 bowersj2 2952:
2953: # Multiple things need this
2954: sub getReturnHash {
2955: my $self = shift;
2956:
2957: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2958: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2959: $self->{RETURN_HASH} = \%tmpHash;
2960: }
2961: }
2962:
2963: ######
2964: # Status queries
2965: ######
2966:
2967: # These methods query the status of problems.
2968:
2969: # If we need to count parts, this function determines the number of
2970: # parts from the metadata. When called, it returns a reference to a list
2971: # of strings corresponding to the parts. (Thus, using it in a scalar context
2972: # tells you how many parts you have in the problem:
2973: # $partcount = scalar($resource->countParts());
2974: # Don't use $self->{PARTS} directly because you don't know if it's been
2975: # computed yet.
2976:
2977: =pod
2978:
2979: =head2 Resource misc
2980:
2981: Misc. functions for the resource.
2982:
2983: =over 4
2984:
1.174 ! albertel 2985: =item * B<hasDiscussion>:
1.59 bowersj2 2986:
1.174 ! albertel 2987: Returns a false value if there has been discussion since the user last
! 2988: logged in, true if there has. Always returns false if the discussion
! 2989: data was not extracted when the nav map was constructed.
! 2990:
! 2991: =item * B<getFeedback>:
! 2992:
! 2993: Gets the feedback for the resource and returns the raw feedback string
! 2994: for the resource, or the null string if there is no feedback or the
! 2995: email data was not extracted when the nav map was constructed. Usually
! 2996: used like this:
1.59 bowersj2 2997:
2998: for (split(/\,/, $res->getFeedback())) {
2999: my $link = &Apache::lonnet::escape($_);
3000: ...
3001:
3002: and use the link as appropriate.
3003:
3004: =cut
3005:
3006: sub hasDiscussion {
3007: my $self = shift;
3008: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3009: }
3010:
3011: sub getFeedback {
3012: my $self = shift;
1.124 bowersj2 3013: my $source = $self->src();
1.125 bowersj2 3014: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 3015: return $self->{NAV_MAP}->getFeedback($source);
3016: }
3017:
3018: sub getErrors {
3019: my $self = shift;
3020: my $source = $self->src();
3021: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3022: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 3023: }
3024:
3025: =pod
3026:
1.174 ! albertel 3027: =item * B<parts>():
1.51 bowersj2 3028:
1.174 ! albertel 3029: Returns a list reference containing sorted strings corresponding to
! 3030: each part of the problem. To count the number of parts, use the list
! 3031: in a scalar context, and subtract one if greater than two. (One part
! 3032: problems have a part 0. Multi-parts have a part 0, plus a part for
! 3033: each part. Filtering part 0 if you want it is up to you.)
! 3034:
! 3035: =item * B<countParts>():
! 3036:
! 3037: Returns the number of parts of the problem a student can answer. Thus,
! 3038: for single part problems, returns 1. For multipart, it returns the
! 3039: number of parts in the problem, not including psuedo-part 0. Thus,
! 3040: B<parts> may return an array with fewer parts in it then countParts
! 3041: might lead you to believe.
1.51 bowersj2 3042:
3043: =back
3044:
3045: =cut
3046:
3047: sub parts {
3048: my $self = shift;
3049:
1.67 bowersj2 3050: if ($self->ext) { return ['0']; }
3051:
1.51 bowersj2 3052: $self->extractParts();
3053: return $self->{PARTS};
3054: }
3055:
3056: sub countParts {
3057: my $self = shift;
3058:
3059: my $parts = $self->parts();
1.163 bowersj2 3060: my $delta = 0;
3061: for my $part (@$parts) {
3062: if ($part eq '0') { $delta--; }
3063: }
1.66 bowersj2 3064:
3065: if ($self->{RESOURCE_ERROR}) {
3066: return 0;
3067: }
3068:
1.163 bowersj2 3069: return scalar(@{$parts}) + $delta;
1.51 bowersj2 3070: }
3071:
3072: # Private function: Extracts the parts information and saves it
3073: sub extractParts {
3074: my $self = shift;
3075:
1.153 bowersj2 3076: return if (defined($self->{PARTS}));
1.67 bowersj2 3077: return if ($self->ext);
1.51 bowersj2 3078:
3079: $self->{PARTS} = [];
3080:
1.82 bowersj2 3081: # Retrieve part count, if this is a problem
3082: if ($self->is_problem()) {
1.152 matthew 3083: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.82 bowersj2 3084: if (!$metadata) {
3085: $self->{RESOURCE_ERROR} = 1;
3086: $self->{PARTS} = [];
3087: return;
3088: }
3089: foreach (split(/\,/,$metadata)) {
1.152 matthew 3090: if ($_ =~ /^part_(.*)$/) {
1.147 bowersj2 3091: my $part = $1;
3092: # check to see if part is turned off.
1.149 matthew 3093: if (! Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
1.147 bowersj2 3094: push @{$self->{PARTS}}, $1;
3095: }
1.82 bowersj2 3096: }
1.51 bowersj2 3097: }
1.82 bowersj2 3098:
3099:
3100: my @sortedParts = sort @{$self->{PARTS}};
3101: $self->{PARTS} = \@sortedParts;
1.154 bowersj2 3102: }
3103:
1.51 bowersj2 3104: return;
3105: }
3106:
3107: =pod
3108:
3109: =head2 Resource Status
3110:
1.174 ! albertel 3111: Problem resources have status information, reflecting their various
! 3112: dates and completion statuses.
1.51 bowersj2 3113:
1.174 ! albertel 3114: There are two aspects to the status: the date-related information and
! 3115: the completion information.
1.51 bowersj2 3116:
1.174 ! albertel 3117: Idiomatic usage of these two methods would probably look something
! 3118: like
1.51 bowersj2 3119:
3120: foreach ($resource->parts()) {
3121: my $dateStatus = $resource->getDateStatus($_);
3122: my $completionStatus = $resource->getCompletionStatus($_);
3123:
1.70 bowersj2 3124: or
3125:
3126: my $status = $resource->status($_);
3127:
1.51 bowersj2 3128: ... use it here ...
3129: }
3130:
1.174 ! albertel 3131: Which you use depends on exactly what you are looking for. The
! 3132: status() function has been optimized for the nav maps display and may
! 3133: not precisely match what you need elsewhere.
1.101 bowersj2 3134:
1.174 ! albertel 3135: The symbolic constants shown below can be accessed through the
! 3136: resource object: C<$res->OPEN>.
1.101 bowersj2 3137:
1.51 bowersj2 3138: =over 4
3139:
1.174 ! albertel 3140: =item * B<getDateStatus>($part):
! 3141:
! 3142: ($part defaults to 0). A convenience function that returns a symbolic
! 3143: constant telling you about the date status of the part. The possible
! 3144: return values are:
1.51 bowersj2 3145:
3146: =back
3147:
3148: B<Date Codes>
3149:
3150: =over 4
3151:
1.174 ! albertel 3152: =item * B<OPEN_LATER>:
! 3153:
! 3154: The problem will be opened later.
! 3155:
! 3156: =item * B<OPEN>:
! 3157:
! 3158: Open and not yet due.
! 3159:
1.51 bowersj2 3160:
1.174 ! albertel 3161: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3162:
1.174 ! albertel 3163: The due date has passed, but the answer date has not yet arrived.
1.59 bowersj2 3164:
1.174 ! albertel 3165: =item * B<PAST_DUE_NO_ANSWER>:
1.54 bowersj2 3166:
1.174 ! albertel 3167: The due date has passed and there is no answer opening date set.
1.51 bowersj2 3168:
1.174 ! albertel 3169: =item * B<ANSWER_OPEN>:
1.51 bowersj2 3170:
1.174 ! albertel 3171: The answer date is here.
! 3172:
! 3173: =item * B<NETWORK_FAILURE>:
! 3174:
! 3175: The information is unknown due to network failure.
1.51 bowersj2 3176:
3177: =back
3178:
3179: =cut
3180:
3181: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 3182: sub OPEN_LATER { return 0; }
3183: sub OPEN { return 1; }
3184: sub PAST_DUE_NO_ANSWER { return 2; }
3185: sub PAST_DUE_ANSWER_LATER { return 3; }
3186: sub ANSWER_OPEN { return 4; }
3187: sub NOTHING_SET { return 5; }
3188: sub NETWORK_FAILURE { return 100; }
3189:
3190: # getDateStatus gets the date status for a given problem part.
3191: # Because answer date, due date, and open date are fully independent
3192: # (i.e., it is perfectly possible to *only* have an answer date),
3193: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3194: # (past, future, none given). This function handles this with a decision
3195: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 3196:
3197: sub getDateStatus {
3198: my $self = shift;
3199: my $part = shift;
3200: $part = "0" if (!defined($part));
1.54 bowersj2 3201:
3202: # Always return network failure if there was one.
1.51 bowersj2 3203: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3204:
3205: my $now = time();
3206:
1.53 bowersj2 3207: my $open = $self->opendate($part);
3208: my $due = $self->duedate($part);
3209: my $answer = $self->answerdate($part);
3210:
3211: if (!$open && !$due && !$answer) {
3212: # no data on the problem at all
3213: # should this be the same as "open later"? think multipart.
3214: return $self->NOTHING_SET;
3215: }
1.59 bowersj2 3216: if (!$open || $now < $open) {return $self->OPEN_LATER}
3217: if (!$due || $now < $due) {return $self->OPEN}
3218: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3219: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 3220: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 3221: }
3222:
3223: =pod
3224:
3225: B<>
3226:
3227: =over 4
3228:
1.174 ! albertel 3229: =item * B<getCompletionStatus>($part):
1.51 bowersj2 3230:
1.174 ! albertel 3231: ($part defaults to 0.) A convenience function that returns a symbolic
! 3232: constant telling you about the completion status of the part, with the
! 3233: following possible results:
! 3234:
! 3235: =back
1.51 bowersj2 3236:
3237: B<Completion Codes>
3238:
3239: =over 4
3240:
1.174 ! albertel 3241: =item * B<NOT_ATTEMPTED>:
! 3242:
! 3243: Has not been attempted at all.
! 3244:
! 3245: =item * B<INCORRECT>:
! 3246:
! 3247: Attempted, but wrong by student.
1.51 bowersj2 3248:
1.174 ! albertel 3249: =item * B<INCORRECT_BY_OVERRIDE>:
1.51 bowersj2 3250:
1.174 ! albertel 3251: Attempted, but wrong by instructor override.
1.51 bowersj2 3252:
1.174 ! albertel 3253: =item * B<CORRECT>:
1.51 bowersj2 3254:
1.174 ! albertel 3255: Correct or correct by instructor.
1.51 bowersj2 3256:
1.174 ! albertel 3257: =item * B<CORRECT_BY_OVERRIDE>:
1.51 bowersj2 3258:
1.174 ! albertel 3259: Correct by instructor override.
1.51 bowersj2 3260:
1.174 ! albertel 3261: =item * B<EXCUSED>:
! 3262:
! 3263: Excused. Not yet implemented.
! 3264:
! 3265: =item * B<NETWORK_FAILURE>:
! 3266:
! 3267: Information not available due to network failure.
! 3268:
! 3269: =item * B<ATTEMPTED>:
! 3270:
! 3271: Attempted, and not yet graded.
1.69 bowersj2 3272:
1.51 bowersj2 3273: =back
3274:
3275: =cut
3276:
1.53 bowersj2 3277: sub NOT_ATTEMPTED { return 10; }
3278: sub INCORRECT { return 11; }
3279: sub INCORRECT_BY_OVERRIDE { return 12; }
3280: sub CORRECT { return 13; }
3281: sub CORRECT_BY_OVERRIDE { return 14; }
3282: sub EXCUSED { return 15; }
1.69 bowersj2 3283: sub ATTEMPTED { return 16; }
1.51 bowersj2 3284:
3285: sub getCompletionStatus {
3286: my $self = shift;
3287: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3288:
1.108 bowersj2 3289: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 3290:
3291: # Left as seperate if statements in case we ever do more with this
3292: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3293: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3294: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3295: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3296: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 3297: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 3298: return $self->NOT_ATTEMPTED;
1.108 bowersj2 3299: }
3300:
3301: sub queryRestoreHash {
3302: my $self = shift;
3303: my $hashentry = shift;
3304: my $part = shift;
3305: $part = "0" if (!defined($part));
3306: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3307:
3308: $self->getReturnHash();
3309:
3310: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 3311: }
3312:
3313: =pod
3314:
3315: B<Composite Status>
3316:
1.174 ! albertel 3317: Along with directly returning the date or completion status, the
! 3318: resource object includes a convenience function B<status>() that will
! 3319: combine the two status tidbits into one composite status that can
! 3320: represent the status of the resource as a whole. The precise logic is
! 3321: documented in the comments of the status method. The following results
! 3322: may be returned, all available as methods on the resource object
! 3323: ($res->NETWORK_FAILURE):
1.51 bowersj2 3324:
3325: =over 4
3326:
1.174 ! albertel 3327: =item * B<NETWORK_FAILURE>:
! 3328:
! 3329: The network has failed and the information is not available.
1.51 bowersj2 3330:
1.174 ! albertel 3331: =item * B<NOTHING_SET>:
1.53 bowersj2 3332:
1.174 ! albertel 3333: No dates have been set for this problem (part) at all. (Because only
! 3334: certain parts of a multi-part problem may be assigned, this can not be
! 3335: collapsed into "open later", as we do not know a given part will EVER
! 3336: be opened. For single part, this is the same as "OPEN_LATER".)
1.51 bowersj2 3337:
1.174 ! albertel 3338: =item * B<CORRECT>:
1.51 bowersj2 3339:
1.174 ! albertel 3340: For any reason at all, the part is considered correct.
1.54 bowersj2 3341:
1.174 ! albertel 3342: =item * B<EXCUSED>:
1.51 bowersj2 3343:
1.174 ! albertel 3344: For any reason at all, the problem is excused.
1.51 bowersj2 3345:
1.174 ! albertel 3346: =item * B<PAST_DUE_NO_ANSWER>:
1.51 bowersj2 3347:
1.174 ! albertel 3348: The problem is past due, not considered correct, and no answer date is
! 3349: set.
1.51 bowersj2 3350:
1.174 ! albertel 3351: =item * B<PAST_DUE_ANSWER_LATER>:
1.51 bowersj2 3352:
1.174 ! albertel 3353: The problem is past due, not considered correct, and an answer date in
! 3354: the future is set.
1.51 bowersj2 3355:
1.174 ! albertel 3356: =item * B<ANSWER_OPEN>:
! 3357:
! 3358: The problem is past due, not correct, and the answer is now available.
! 3359:
! 3360: =item * B<OPEN_LATER>:
! 3361:
! 3362: The problem is not yet open.
! 3363:
! 3364: =item * B<TRIES_LEFT>:
! 3365:
! 3366: The problem is open, has been tried, is not correct, but there are
! 3367: tries left.
! 3368:
! 3369: =item * B<INCORRECT>:
! 3370:
! 3371: The problem is open, and all tries have been used without getting the
! 3372: correct answer.
! 3373:
! 3374: =item * B<OPEN>:
! 3375:
! 3376: The item is open and not yet tried.
! 3377:
! 3378: =item * B<ATTEMPTED>:
! 3379:
! 3380: The problem has been attempted.
1.69 bowersj2 3381:
1.51 bowersj2 3382: =back
3383:
3384: =cut
3385:
3386: sub TRIES_LEFT { return 10; }
3387:
3388: sub status {
3389: my $self = shift;
3390: my $part = shift;
3391: if (!defined($part)) { $part = "0"; }
3392: my $completionStatus = $self->getCompletionStatus($part);
3393: my $dateStatus = $self->getDateStatus($part);
3394:
3395: # What we have is a two-dimensional matrix with 4 entries on one
3396: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 3397: # plus network failure and "no date data at all".
1.51 bowersj2 3398:
1.53 bowersj2 3399: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 3400:
3401: # There are a few whole rows we can dispose of:
1.53 bowersj2 3402: if ($completionStatus == CORRECT ||
3403: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 3404: return CORRECT;
3405: }
3406:
3407: if ($completionStatus == ATTEMPTED) {
3408: return ATTEMPTED;
1.53 bowersj2 3409: }
3410:
3411: # If it's EXCUSED, then return that no matter what
3412: if ($completionStatus == EXCUSED) {
3413: return EXCUSED;
1.51 bowersj2 3414: }
3415:
1.53 bowersj2 3416: if ($dateStatus == NOTHING_SET) {
3417: return NOTHING_SET;
1.51 bowersj2 3418: }
3419:
1.69 bowersj2 3420: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3421: # by 4 matrix (date statuses).
1.51 bowersj2 3422:
1.54 bowersj2 3423: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 3424: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 3425: return $dateStatus;
1.51 bowersj2 3426: }
3427:
1.53 bowersj2 3428: if ($dateStatus == ANSWER_OPEN) {
3429: return ANSWER_OPEN;
1.51 bowersj2 3430: }
3431:
3432: # Now: (incorrect, incorrect_override, not_attempted) x
3433: # (open_later), (open)
3434:
1.53 bowersj2 3435: if ($dateStatus == OPEN_LATER) {
3436: return OPEN_LATER;
1.51 bowersj2 3437: }
3438:
3439: # If it's WRONG...
1.53 bowersj2 3440: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 3441: # and there are TRIES LEFT:
1.79 bowersj2 3442: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 3443: return TRIES_LEFT;
1.51 bowersj2 3444: }
1.53 bowersj2 3445: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 3446: }
3447:
3448: # Otherwise, it's untried and open
1.53 bowersj2 3449: return OPEN;
1.51 bowersj2 3450: }
3451:
3452: =pod
3453:
3454: =head2 Resource/Nav Map Navigation
3455:
3456: =over 4
3457:
1.174 ! albertel 3458: =item * B<getNext>():
! 3459:
! 3460: Retreive an array of the possible next resources after this
! 3461: one. Always returns an array, even in the one- or zero-element case.
! 3462:
! 3463: =item * B<getPrevious>():
1.85 bowersj2 3464:
1.174 ! albertel 3465: Retreive an array of the possible previous resources from this
! 3466: one. Always returns an array, even in the one- or zero-element case.
1.51 bowersj2 3467:
3468: =cut
3469:
3470: sub getNext {
3471: my $self = shift;
3472: my @branches;
3473: my $to = $self->to();
1.85 bowersj2 3474: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 3475: my $choice = $self->{NAV_MAP}->getById($branch);
3476: my $next = $choice->goesto();
3477: $next = $self->{NAV_MAP}->getById($next);
3478:
1.131 bowersj2 3479: push @branches, $next;
1.85 bowersj2 3480: }
3481: return \@branches;
3482: }
3483:
3484: sub getPrevious {
3485: my $self = shift;
3486: my @branches;
3487: my $from = $self->from();
3488: foreach my $branch ( split /,/, $from) {
3489: my $choice = $self->{NAV_MAP}->getById($branch);
3490: my $prev = $choice->comesfrom();
3491: $prev = $self->{NAV_MAP}->getById($prev);
3492:
1.131 bowersj2 3493: push @branches, $prev;
1.51 bowersj2 3494: }
3495: return \@branches;
1.131 bowersj2 3496: }
3497:
3498: sub browsePriv {
3499: my $self = shift;
3500: if (defined($self->{BROWSE_PRIV})) {
3501: return $self->{BROWSE_PRIV};
3502: }
3503:
3504: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 3505: }
3506:
3507: =pod
1.2 www 3508:
1.51 bowersj2 3509: =back
1.2 www 3510:
1.51 bowersj2 3511: =cut
1.2 www 3512:
1.51 bowersj2 3513: 1;
1.2 www 3514:
1.51 bowersj2 3515: __END__
1.2 www 3516:
3517:
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