Annotation of loncom/interface/lonnavmaps.pm, revision 1.173
1.72 bowersj2 1:
1.2 www 2: # The LearningOnline Network with CAPA
3: # Navigate Maps Handler
1.1 www 4: #
1.173 ! albertel 5: # $Id: lonnavmaps.pm,v 1.172 2003/04/04 19:08:46 bowersj2 Exp $
1.20 albertel 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
1.2 www 29: # (Page Handler
1.1 www 30: #
1.2 www 31: # (TeX Content Handler
1.1 www 32: #
1.2 www 33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 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 36: #
1.17 www 37: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21 www 38: # YEAR=2002
39: # 1/1 Gerd Kortemeyer
1.105 bowersj2 40: # Oct-Nov Jeremy Bowers
1.153 bowersj2 41: # YEAR=2003
42: # Jeremy Bowers ... lots of days
1.2 www 43:
1.1 www 44: package Apache::lonnavmaps;
45:
46: use strict;
1.2 www 47: use Apache::Constants qw(:common :http);
1.18 albertel 48: use Apache::loncommon();
1.150 www 49: use Apache::lonmenu();
1.73 bowersj2 50: use POSIX qw (floor strftime);
1.2 www 51:
1.133 bowersj2 52: # symbolic constants
53: sub SYMB { return 1; }
54: sub URL { return 2; }
55: sub NOTHING { return 3; }
56:
57: # Some data
58:
1.140 bowersj2 59: my $resObj = "Apache::lonnavmaps::resource";
60:
1.135 bowersj2 61: # Keep these mappings in sync with lonquickgrades, which uses the colors
62: # instead of the icons.
63: my %statusIconMap =
1.140 bowersj2 64: ( $resObj->NETWORK_FAILURE => '',
65: $resObj->NOTHING_SET => '',
66: $resObj->CORRECT => 'navmap.correct.gif',
67: $resObj->EXCUSED => 'navmap.correct.gif',
68: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
69: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
70: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
71: $resObj->OPEN_LATER => '',
72: $resObj->TRIES_LEFT => 'navmap.open.gif',
73: $resObj->INCORRECT => 'navmap.wrong.gif',
74: $resObj->OPEN => 'navmap.open.gif',
75: $resObj->ATTEMPTED => 'navmap.open.gif' );
1.135 bowersj2 76:
77: my %iconAltTags =
78: ( 'navmap.correct.gif' => 'Correct',
79: 'navmap.wrong.gif' => 'Incorrect',
80: 'navmap.open.gif' => 'Open' );
1.133 bowersj2 81:
1.136 bowersj2 82: # Defines a status->color mapping, null string means don't color
83: my %colormap =
1.140 bowersj2 84: ( $resObj->NETWORK_FAILURE => '',
85: $resObj->CORRECT => '',
86: $resObj->EXCUSED => '#3333FF',
87: $resObj->PAST_DUE_ANSWER_LATER => '',
88: $resObj->PAST_DUE_NO_ANSWER => '',
89: $resObj->ANSWER_OPEN => '#006600',
90: $resObj->OPEN_LATER => '',
91: $resObj->TRIES_LEFT => '',
92: $resObj->INCORRECT => '',
93: $resObj->OPEN => '',
94: $resObj->NOTHING_SET => '' );
1.136 bowersj2 95: # And a special case in the nav map; what to do when the assignment
96: # is not yet done and due in less then 24 hours
97: my $hurryUpColor = "#FF0000";
1.130 www 98:
1.1 www 99: sub handler {
1.99 bowersj2 100: my $r = shift;
1.118 bowersj2 101: real_handler($r);
102: }
103:
104: sub real_handler {
105: my $r = shift;
1.2 www 106:
1.51 bowersj2 107: # Handle header-only request
108: if ($r->header_only) {
109: if ($ENV{'browser.mathml'}) {
110: $r->content_type('text/xml');
111: } else {
112: $r->content_type('text/html');
113: }
114: $r->send_http_header;
115: return OK;
116: }
117:
118: # Send header, don't cache this page
119: if ($ENV{'browser.mathml'}) {
120: $r->content_type('text/xml');
121: } else {
122: $r->content_type('text/html');
123: }
124: &Apache::loncommon::no_cache($r);
125: $r->send_http_header;
126:
1.106 bowersj2 127: # Create the nav map
1.168 bowersj2 128: my $navmap = Apache::lonnavmaps::navmap->new(
1.51 bowersj2 129: $ENV{"request.course.fn"}.".db",
1.80 bowersj2 130: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1.51 bowersj2 131:
1.55 bowersj2 132:
133: if (!defined($navmap)) {
134: my $requrl = $r->uri;
135: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
136: return HTTP_NOT_ACCEPTABLE;
137: }
1.64 bowersj2 138:
1.111 bowersj2 139: $r->print("<html><head>\n");
1.150 www 140: $r->print("<title>Navigate Course Contents</title>");
141: # ------------------------------------------------------------ Get query string
142: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
1.158 bowersj2 143:
1.150 www 144: # ----------------------------------------------------- Force menu registration
145: my $addentries='';
146: if ($ENV{'form.register'}) {
147: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
148: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
149: $r->print(&Apache::lonmenu::registerurl(1));
150: }
1.111 bowersj2 151:
1.64 bowersj2 152: # Header
1.150 www 153: $r->print('</head>'.
154: &Apache::loncommon::bodytag('Navigate Course Contents','',
1.151 www 155: $addentries,'','',$ENV{'form.register'}));
1.64 bowersj2 156: $r->print('<script>window.focus();</script>');
1.101 bowersj2 157:
1.124 bowersj2 158: $r->rflush();
159:
160: # Now that we've displayed some stuff to the user, init the navmap
161: $navmap->init();
162:
1.95 bowersj2 163: $r->print('<br> ');
164: $r->rflush();
165:
1.55 bowersj2 166: # Check that it's defined
167: if (!($navmap->courseMapDefined())) {
168: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
169: '</body></html>');
170: return OK;
171: }
172:
1.155 bowersj2 173: # See if there's only one map in the top-level... if so,
174: # automatically display it
175: my $iterator = $navmap->getIterator(undef, undef, undef, 0);
176: my $depth = 1;
177: $iterator->next();
178: my $curRes = $iterator->next();
179: my $sequenceCount = 0;
180: my $sequenceId;
181: while ($depth > 0) {
182: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
183: if ($curRes == $iterator->END_MAP()) { $depth--; }
184:
185: if (ref($curRes) && $curRes->is_sequence()) {
186: $sequenceCount++;
187: $sequenceId = $curRes->map_pc();
188: }
189:
190: $curRes = $iterator->next();
191: }
192:
193: if ($sequenceCount == 1) {
194: # The automatic iterator creation in the render call
195: # will pick this up.
196: $ENV{'form.filter'} = "$sequenceId";
197: }
198:
1.133 bowersj2 199: # renderer call
1.140 bowersj2 200: my $render = render({ 'cols' => [0,1,2,3],
201: 'url' => '/adm/navmaps',
1.169 bowersj2 202: 'navmap' => $navmap,
1.153 bowersj2 203: 'suppressNavmap' => 1,
1.140 bowersj2 204: 'r' => $r});
1.133 bowersj2 205:
1.168 bowersj2 206: $navmap->untieHashes();
1.51 bowersj2 207:
1.128 bowersj2 208: $r->print("</body></html>");
1.134 bowersj2 209: $r->rflush();
1.59 bowersj2 210:
1.51 bowersj2 211: return OK;
212: }
213:
214: # Convenience functions: Returns a string that adds or subtracts
215: # the second argument from the first hash, appropriate for the
216: # query string that determines which folders to recurse on
217: sub addToFilter {
218: my $hashIn = shift;
219: my $addition = shift;
220: my %hash = %$hashIn;
221: $hash{$addition} = 1;
222:
223: return join (",", keys(%hash));
224: }
225:
226: sub removeFromFilter {
227: my $hashIn = shift;
228: my $subtraction = shift;
229: my %hash = %$hashIn;
230:
231: delete $hash{$subtraction};
232: return join(",", keys(%hash));
233: }
234:
235: # Convenience function: Given a stack returned from getStack on the iterator,
236: # return the correct src() value.
237: # Later, this should add an anchor when we start putting anchors in pages.
238: sub getLinkForResource {
239: my $stack = shift;
240: my $res;
241:
242: # Check to see if there are any pages in the stack
243: foreach $res (@$stack) {
244: if (defined($res) && $res->is_page()) {
245: return $res->src();
246: }
247: }
248:
249: # Failing that, return the src of the last resource that is defined
250: # (when we first recurse on a map, it puts an undefined resource
251: # on the bottom because $self->{HERE} isn't defined yet, and we
252: # want the src for the map anyhow)
253: foreach (@$stack) {
254: if (defined($_)) { $res = $_; }
255: }
256:
257: return $res->src();
258: }
259:
1.53 bowersj2 260: # Convenience function: This seperates the logic of how to create
261: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
262: # etc.) into a seperate function. It takes a resource object as the
263: # first parameter, and the part number of the resource as the second.
264: # It's basically a big switch statement on the status of the resource.
265:
266: sub getDescription {
267: my $res = shift;
268: my $part = shift;
1.69 bowersj2 269: my $status = $res->status($part);
1.53 bowersj2 270:
271: if ($status == $res->NETWORK_FAILURE) { return ""; }
272: if ($status == $res->NOTHING_SET) {
273: return "Not currently assigned.";
274: }
275: if ($status == $res->OPEN_LATER) {
1.73 bowersj2 276: return "Open " . timeToHumanString($res->opendate($part));
1.53 bowersj2 277: }
278: if ($status == $res->OPEN) {
1.79 bowersj2 279: if ($res->duedate($part)) {
1.73 bowersj2 280: return "Due " . timeToHumanString($res->duedate($part));
1.66 bowersj2 281: } else {
282: return "Open, no due date";
283: }
1.53 bowersj2 284: }
1.54 bowersj2 285: if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.73 bowersj2 286: return "Answer open " . timeToHumanString($res->answerdate($part));
1.54 bowersj2 287: }
288: if ($status == $res->PAST_DUE_NO_ANSWER) {
1.73 bowersj2 289: return "Was due " . timeToHumanString($res->duedate($part));
1.53 bowersj2 290: }
291: if ($status == $res->ANSWER_OPEN) {
292: return "Answer available";
293: }
1.59 bowersj2 294: if ($status == $res->EXCUSED) {
1.66 bowersj2 295: return "Excused by instructor";
1.59 bowersj2 296: }
1.69 bowersj2 297: if ($status == $res->ATTEMPTED) {
298: return "Not yet graded.";
299: }
1.59 bowersj2 300: if ($status == $res->TRIES_LEFT) {
1.79 bowersj2 301: my $tries = $res->tries($part);
302: my $maxtries = $res->maxtries($part);
303: my $triesString = "";
304: if ($tries && $maxtries) {
305: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
306: if ($maxtries > 1 && $maxtries - $tries == 1) {
307: $triesString = "<b>$triesString</b>";
308: }
309: }
1.66 bowersj2 310: if ($res->duedate()) {
1.73 bowersj2 311: return "Due " . timeToHumanString($res->duedate($part)) .
1.66 bowersj2 312: " $triesString";
313: } else {
314: return "No due date $triesString";
315: }
1.59 bowersj2 316: }
1.53 bowersj2 317: }
318:
1.115 bowersj2 319: # Convenience function, so others can use it: Is the problem due in less then
320: # 24 hours, and still can be done?
321:
322: sub dueInLessThen24Hours {
323: my $res = shift;
324: my $part = shift;
325: my $status = $res->status($part);
326:
327: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
328: $status == $res->TRIES_LEFT()) &&
329: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
330: $res->duedate() > time();
331: }
332:
333: # Convenience function, so others can use it: Is there only one try remaining for the
334: # part, with more then one try to begin with, not due yet and still can be done?
335: sub lastTry {
336: my $res = shift;
337: my $part = shift;
338:
339: my $tries = $res->tries($part);
340: my $maxtries = $res->maxtries($part);
341: return $tries && $maxtries && $maxtries > 1 &&
342: $maxtries - $tries == 1 && $res->duedate() &&
343: $res->duedate() > time();
344: }
345:
1.101 bowersj2 346: # This puts a human-readable name on the ENV variable.
1.158 bowersj2 347: # FIXME: This needs better logic: Who gets the advanced view of navmaps?
348: # As of 3-13-03, it's an open question. Guy doesn't want to check
349: # roles directly because it should be a check of capabilities for future
350: # role compatibity. There is no capability that matches this one for
351: # now, so this is done. (A hack for 1.0 might be to simply check roles
352: # anyhow.)
1.68 bowersj2 353: sub advancedUser {
354: return $ENV{'user.adv'};
355: }
356:
1.73 bowersj2 357:
358: # timeToHumanString takes a time number and converts it to a
359: # human-readable representation, meant to be used in the following
360: # manner:
361: # print "Due $timestring"
362: # print "Open $timestring"
363: # print "Answer available $timestring"
364: # Very, very, very, VERY English-only... goodness help a localizer on
365: # this func...
1.53 bowersj2 366: sub timeToHumanString {
1.58 albertel 367: my ($time) = @_;
368: # zero, '0' and blank are bad times
1.73 bowersj2 369: if (!$time) {
370: return 'never';
371: }
372:
373: my $now = time();
374:
375: my @time = localtime($time);
376: my @now = localtime($now);
377:
378: # Positive = future
379: my $delta = $time - $now;
380:
381: my $minute = 60;
382: my $hour = 60 * $minute;
383: my $day = 24 * $hour;
384: my $week = 7 * $day;
385: my $inPast = 0;
386:
387: # Logic in comments:
388: # Is it now? (extremely unlikely)
389: if ( $delta == 0 ) {
390: return "this instant";
391: }
392:
393: if ($delta < 0) {
394: $inPast = 1;
395: $delta = -$delta;
396: }
397:
398: if ( $delta > 0 ) {
1.101 bowersj2 399:
1.73 bowersj2 400: my $tense = $inPast ? " ago" : "";
401: my $prefix = $inPast ? "" : "in ";
1.101 bowersj2 402:
403: # Less then a minute
1.73 bowersj2 404: if ( $delta < $minute ) {
405: if ($delta == 1) { return "${prefix}1 second$tense"; }
406: return "$prefix$delta seconds$tense";
407: }
408:
1.101 bowersj2 409: # Less then an hour
1.73 bowersj2 410: if ( $delta < $hour ) {
411: # If so, use minutes
412: my $minutes = floor($delta / 60);
413: if ($minutes == 1) { return "${prefix}1 minute$tense"; }
414: return "$prefix$minutes minutes$tense";
415: }
416:
417: # Is it less then 24 hours away? If so,
418: # display hours + minutes
419: if ( $delta < $hour * 24) {
420: my $hours = floor($delta / $hour);
421: my $minutes = floor(($delta % $hour) / $minute);
422: my $hourString = "$hours hours";
423: my $minuteString = ", $minutes minutes";
424: if ($hours == 1) {
425: $hourString = "1 hour";
426: }
427: if ($minutes == 1) {
428: $minuteString = ", 1 minute";
429: }
430: if ($minutes == 0) {
431: $minuteString = "";
432: }
433: return "$prefix$hourString$minuteString$tense";
434: }
435:
436: # Less then 5 days away, display day of the week and
437: # HH:MM
438: if ( $delta < $day * 5 ) {
1.85 bowersj2 439: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
1.73 bowersj2 440: $timeStr =~ s/12:00 am/midnight/;
441: $timeStr =~ s/12:00 pm/noon/;
442: return ($inPast ? "last " : "next ") .
443: $timeStr;
444: }
445:
446: # Is it this year?
447: if ( $time[5] == $now[5]) {
448: # Return on Month Day, HH:MM meridian
449: my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
450: $timeStr =~ s/12:00 am/midnight/;
451: $timeStr =~ s/12:00 pm/noon/;
452: return $timeStr;
453: }
454:
455: # Not this year, so show the year
456: my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
457: $timeStr =~ s/12:00 am/midnight/;
458: $timeStr =~ s/12:00 pm/noon/;
459: return $timeStr;
1.58 albertel 460: }
1.53 bowersj2 461: }
462:
1.51 bowersj2 463:
1.133 bowersj2 464: =pod
465:
466: =head1 navmap renderer
467:
468: The navmaprenderer package provides a sophisticated rendering of the standard navigation maps interface into HTML. The provided nav map handler is actually just a glorified call to this.
469:
470: Because of the large number of parameters this function presents, instead of passing it arguments as is normal, pass it in an anonymous hash with the given options. This is because there is no obvious order you may wish to override these in and a hash is easier to read and understand then "undef, undef, undef, 1, undef, undef, renderButton, undef, 0" when you mostly want default behaviors.
471:
472: The package provides a function called 'render', called as Apache::lonnavmaps::renderer->render({}).
1.51 bowersj2 473:
1.133 bowersj2 474: =head2 Overview of Columns
1.51 bowersj2 475:
1.133 bowersj2 476: The renderer will build an HTML table for the navmap and return it. The table is consists of several columns, and a row for each resource (or possibly each part). You tell the renderer how many columns to create and what to place in each column, optionally using one or more of the preparent columns, and the renderer will assemble the table.
1.51 bowersj2 477:
1.133 bowersj2 478: Any additional generally useful column types should be placed in the renderer code here, so anybody can use it anywhere else. Any code specific to the current application (such as the addition of <input> elements in a column) should be placed in the code of the thing using the renderer.
1.51 bowersj2 479:
1.133 bowersj2 480: At the core of the renderer is the array reference COLS (see Example section below for how to pass this correctly). The COLS array will consist of entries of one of two types of things: Either an integer representing one of the pre-packaged column types, or a sub reference that takes a resource reference, a part number, and a reference to the argument hash passed to the renderer, and returns a string that will be inserted into the HTML representation as it.
1.51 bowersj2 481:
1.133 bowersj2 482: The pre-packaged column names are refered to by constants in the Apache::lonnavmaps::renderer namespace. The following currently exist:
1.51 bowersj2 483:
1.133 bowersj2 484: =over 4
1.51 bowersj2 485:
1.133 bowersj2 486: =item * B<resource>: The general info about the resource: Link, icon for the type, etc. The first column in the standard nav map display. This column also accepts the following parameter in the renderer hash:
1.51 bowersj2 487:
488: =over 4
489:
1.133 bowersj2 490: =item * B<resource_nolink>: If true, the resource will not be linked. Default: false, resource will have links.
491:
492: =item * B<resource_part_count>: If true (default), the resource will show a part count if the full part list is not displayed. If false, the resource will never show a part count.
493:
1.172 bowersj2 494: =item * B<resource_no_folder_link>: If true, the resource's folder will not be clickable to open or close it. Default is false. True implies printCloseAll is false, since you can't close or open folders when this is on anyhow.
1.144 bowersj2 495:
1.133 bowersj2 496: =back
1.51 bowersj2 497:
1.133 bowersj2 498: =item B<communication_status>: Whether there is discussion on the resource, email for the user, or (lumped in here) perl errors in the execution of the problem. This is the second column in the main nav map.
1.51 bowersj2 499:
1.133 bowersj2 500: =item B<quick_status>: An icon for the status of a problem, with four possible states: Correct, incorrect, open, or none (not open yet, not a problem). The third column of the standard navmap.
1.51 bowersj2 501:
1.133 bowersj2 502: =item B<long_status>: A text readout of the details of the current status of the problem, such as "Due in 22 hours". The fourth column of the standard navmap.
1.51 bowersj2 503:
1.133 bowersj2 504: =back
1.51 bowersj2 505:
1.133 bowersj2 506: If you add any others please be sure to document them here.
1.51 bowersj2 507:
1.133 bowersj2 508: An example of a column renderer that will show the ID number of a resource, along with the part name if any:
1.51 bowersj2 509:
1.133 bowersj2 510: sub {
511: my ($resource, $part, $params) = @_;
512: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
513: return '<td>' . $resource->{ID} . '</td>';
514: }
1.51 bowersj2 515:
1.133 bowersj2 516: Note these functions are responsible for the TD tags, which allow them to override vertical and horizontal alignment, etc.
1.130 www 517:
1.133 bowersj2 518: =head2 Parameters
1.115 bowersj2 519:
1.140 bowersj2 520: Most of these parameters are only useful if you are *not* using the folder interface (i.e., the default first column), which is probably the common case. If you are using this interface, then you should be able to get away with just using 'cols' (to specify the columns shown), 'url' (necessary for the folders to link to the current screen correctly), and possibly 'queryString' if your app calls for it. In that case, maintaining the state of the folders will be done automatically.
521:
1.133 bowersj2 522: =over 4
1.51 bowersj2 523:
1.144 bowersj2 524: =item * B<iterator>: A reference to a fresh ::iterator to use from the navmaps. The rendering will reflect the options passed to the iterator, so you can use that to just render a certain part of the course, if you like. If one is not passed, the renderer will attempt to construct one from ENV{'form.filter'} and ENV{'form.condition'} information, plus the 'iterator_map' parameter if any.
525:
526: =item * B<iterator_map>: If you are letting the renderer do the iterator handling, you can instruct the renderer to render only a particular map by passing it the source of the map you want to process, like '/res/103/jerf/navmap.course.sequence'.
1.140 bowersj2 527:
528: =item * B<navmap>: A reference to a navmap, used only if an iterator is not passed in. If this is necessary to make an iterator but it is not passed in, a new one will be constructed based on ENV info. This is useful to do basic error checking before passing it off to render.
1.92 bowersj2 529:
1.164 bowersj2 530: =item * B<r>: The standard Apache response object. This must be passed to the renderer or the course hash will be locked.
531:
1.133 bowersj2 532: =item * B<cols>: An array reference
1.92 bowersj2 533:
1.133 bowersj2 534: =item * B<showParts>: A flag. If yes (default), a line for the resource itself, and a line for each part will be displayed. If not, only one line for each resource will be displayed.
1.51 bowersj2 535:
1.133 bowersj2 536: =item * B<condenseParts>: A flag. If yes (default), if all parts of the problem have the same status and that status is Nothing Set, Correct, or Network Failure, then only one line will be displayed for that resource anyhow. If no, all parts will always be displayed. If showParts is 0, this is ignored.
1.55 bowersj2 537:
1.159 bowersj2 538: =item * B<jumpCount>: A string identifying the URL to place the anchor 'curloc' at. Default to no anchor at all. It is the responsibility of the renderer user to ensure that the #curloc is in the URL. By default, determined through the use of the ENV{} 'jump' information, and should normally "just work" correctly.
1.84 bowersj2 539:
1.158 bowersj2 540: =item * B<here>: A Symb identifying where to place the 'here' marker. Default empty, which means no marker.
1.115 bowersj2 541:
1.133 bowersj2 542: =item * B<indentString>: A string identifying the indentation string to use. By default, this is a 25 pixel whitespace image with no alt text.
1.55 bowersj2 543:
1.133 bowersj2 544: =item * B<queryString>: A string which will be prepended to the query string used when the folders are opened or closed.
1.51 bowersj2 545:
1.133 bowersj2 546: =item * B<url>: The url the folders will link to, which should be the current page. Required if the resource info column is shown.
1.51 bowersj2 547:
1.140 bowersj2 548: =item * B<currentJumpIndex>: Describes the currently-open row number to cause the browser to jump to, because the user just opened that folder. By default, pulled from the Jump information in the ENV{'form.*'}.
1.139 bowersj2 549:
1.140 bowersj2 550: =item * B<printKey>: If true, print the key that appears on the top of the standard navmaps. Default is false.
551:
552: =item * B<printCloseAll>: If true, print the "Close all folders" or "open all folders" links. Default is true.
553:
1.153 bowersj2 554: =item * B<filterFunc>: A function that takes the resource object as its only parameter and returns a true or false value. If true, the resource is displayed. If false, it is simply skipped in the display. By default, all resources are shown.
555:
556: =item * B<suppressNavmaps>: If true, will not display Navigate Content resources. Default to false.
1.143 bowersj2 557:
1.133 bowersj2 558: =back
1.51 bowersj2 559:
1.133 bowersj2 560: =head2 Additional Info
1.51 bowersj2 561:
1.133 bowersj2 562: In addition to the parameters you can pass to the renderer, which will be passed through unchange to the column renderers, the renderer will generate the following information which your renderer may find useful:
1.59 bowersj2 563:
1.145 bowersj2 564: If you want to know how many rows were printed, the 'counter' element of the hash passed into the render function will contain the count. You may want to check whether any resources were printed at all.
565:
1.133 bowersj2 566: =over 4
1.59 bowersj2 567:
1.133 bowersj2 568: =back
1.59 bowersj2 569:
1.133 bowersj2 570: =cut
1.59 bowersj2 571:
1.133 bowersj2 572: sub resource { return 0; }
573: sub communication_status { return 1; }
574: sub quick_status { return 2; }
575: sub long_status { return 3; }
1.124 bowersj2 576:
1.133 bowersj2 577: # Data for render_resource
1.51 bowersj2 578:
1.133 bowersj2 579: sub render_resource {
580: my ($resource, $part, $params) = @_;
1.51 bowersj2 581:
1.133 bowersj2 582: my $nonLinkedText = ''; # stuff after resource title not in link
1.51 bowersj2 583:
1.134 bowersj2 584: my $link = $params->{"resourceLink"};
585: my $src = $resource->src();
586: my $it = $params->{"iterator"};
1.133 bowersj2 587: my $filter = $it->{FILTER};
588:
589: my $title = $resource->compTitle();
590: if ($src =~ /^\/uploaded\//) {
591: $nonLinkedText=$title;
592: $title = '';
593: }
594: my $partLabel = "";
595: my $newBranchText = "";
596:
597: # If this is a new branch, label it so
598: if ($params->{'isNewBranch'}) {
599: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
1.51 bowersj2 600: }
601:
1.133 bowersj2 602: # links to open and close the folder
603: my $linkopen = "<a href='$link'>";
604: my $linkclose = "</a>";
1.51 bowersj2 605:
1.133 bowersj2 606: # Default icon: HTML page
607: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
608:
609: if ($resource->is_problem()) {
1.156 bowersj2 610: if ($part eq "" || $params->{'condensed'}) {
1.133 bowersj2 611: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
612: } else {
613: $icon = $params->{'indentString'};
614: }
615: }
1.51 bowersj2 616:
1.133 bowersj2 617: # Display the correct map icon to open or shut map
618: if ($resource->is_map()) {
619: my $mapId = $resource->map_pc();
620: my $nowOpen = !defined($filter->{$mapId});
621: if ($it->{CONDITION}) {
622: $nowOpen = !$nowOpen;
623: }
1.144 bowersj2 624:
625: if (!$params->{'resource_no_folder_link'}) {
626: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
627: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
628:
629: $linkopen = "<a href='" . $params->{'url'} . '?' .
630: $params->{'queryString'} . '&filter=';
631: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
632: addToFilter($filter, $mapId) :
633: removeFromFilter($filter, $mapId);
634: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
635: . $params->{'hereType'} . '&here=' .
636: &Apache::lonnet::escape($params->{'here'}) .
1.159 bowersj2 637: '&jump=' .
1.144 bowersj2 638: &Apache::lonnet::escape($resource->symb()) .
639: "&folderManip=1'>";
640: } else {
641: # Don't allow users to manipulate folder
642: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
643: '.nomanip.gif';
644: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
645:
646: $linkopen = "";
647: $linkclose = "";
648: }
1.133 bowersj2 649: }
1.51 bowersj2 650:
1.133 bowersj2 651: if ($resource->randomout()) {
652: $nonLinkedText .= ' <i>(hidden)</i> ';
653: }
654:
655: # We're done preparing and finally ready to start the rendering
656: my $result = "<td align='left' valign='center'>";
1.140 bowersj2 657:
658: my $indentLevel = $params->{'indentLevel'};
659: if ($newBranchText) { $indentLevel--; }
660:
1.133 bowersj2 661: # print indentation
1.140 bowersj2 662: for (my $i = 0; $i < $indentLevel; $i++) {
1.133 bowersj2 663: $result .= $params->{'indentString'};
1.84 bowersj2 664: }
665:
1.133 bowersj2 666: # Decide what to display
667: $result .= "$newBranchText$linkopen$icon$linkclose";
668:
669: my $curMarkerBegin = '';
670: my $curMarkerEnd = '';
1.51 bowersj2 671:
1.133 bowersj2 672: # Is this the current resource?
1.158 bowersj2 673: if (!$params->{'displayedHereMarker'} &&
674: $resource->symb() eq $params->{'here'} ) {
1.133 bowersj2 675: $curMarkerBegin = '<font color="red" size="+2">> </font>';
676: $curMarkerEnd = '<font color="red" size="+2"><</font>';
1.158 bowersj2 677: $params->{'displayedHereMarker'} = 1;
1.51 bowersj2 678: }
679:
1.156 bowersj2 680: if ($resource->is_problem() && $part ne "" &&
1.133 bowersj2 681: !$params->{'condensed'}) {
682: $partLabel = " (Part $part)";
683: $title = "";
1.51 bowersj2 684: }
685:
1.163 bowersj2 686: if ($params->{'condensed'} && $resource->countParts() > 1) {
1.133 bowersj2 687: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
1.51 bowersj2 688: }
689:
1.144 bowersj2 690: if (!$params->{'resource_nolink'}) {
691: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
692: } else {
693: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
694: }
1.51 bowersj2 695:
1.133 bowersj2 696: return $result;
697: }
1.51 bowersj2 698:
1.133 bowersj2 699: sub render_communication_status {
700: my ($resource, $part, $params) = @_;
1.134 bowersj2 701: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
702:
703: my $link = $params->{"resourceLink"};
704: my $linkopen = "<a href='$link'>";
705: my $linkclose = "</a>";
706:
707: if ($resource->hasDiscussion()) {
708: $discussionHTML = $linkopen .
709: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
710: $linkclose;
711: }
712:
713: if ($resource->getFeedback()) {
714: my $feedback = $resource->getFeedback();
715: foreach (split(/\,/, $feedback)) {
716: if ($_) {
717: $feedbackHTML .= ' <a href="/adm/email?display='
718: . &Apache::lonnet::escape($_) . '">'
719: . '<img src="/adm/lonMisc/feedback.gif" '
720: . 'border="0" /></a>';
721: }
722: }
723: }
724:
725: if ($resource->getErrors()) {
726: my $errors = $resource->getErrors();
727: foreach (split(/,/, $errors)) {
728: if ($_) {
729: $errorHTML .= ' <a href="/adm/email?display='
730: . &Apache::lonnet::escape($_) . '">'
731: . '<img src="/adm/lonMisc/bomb.gif" '
732: . 'border="0" /></a>';
733: }
734: }
735: }
736:
737: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
738:
1.133 bowersj2 739: }
740: sub render_quick_status {
741: my ($resource, $part, $params) = @_;
1.135 bowersj2 742: my $result = "";
743: my $firstDisplayed = !$params->{'condensed'} &&
744: $params->{'multipart'} && $part eq "0";
745:
746: my $link = $params->{"resourceLink"};
747: my $linkopen = "<a href='$link'>";
748: my $linkclose = "</a>";
749:
750: if ($resource->is_problem() &&
751: !$firstDisplayed) {
752: my $icon = $statusIconMap{$resource->status($part)};
753: my $alt = $iconAltTags{$icon};
754: if ($icon) {
755: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
756: } else {
757: $result .= "<td width='30'> </td>\n";
758: }
759: } else { # not problem, no icon
760: $result .= "<td width='30'> </td>\n";
761: }
762:
763: return $result;
1.133 bowersj2 764: }
765: sub render_long_status {
766: my ($resource, $part, $params) = @_;
1.136 bowersj2 767: my $result = "<td align='right' valign='center'>\n";
768: my $firstDisplayed = !$params->{'condensed'} &&
769: $params->{'multipart'} && $part eq "0";
770:
771: my $color;
772: if ($resource->is_problem()) {
773: $color = $colormap{$resource->status};
774:
775: if (dueInLessThen24Hours($resource, $part) ||
776: lastTry($resource, $part)) {
777: $color = $hurryUpColor;
778: }
779: }
780:
781: if ($resource->kind() eq "res" &&
782: $resource->is_problem() &&
783: !$firstDisplayed) {
784: if ($color) {$result .= "<font color=\"$color\"><b>"; }
785: $result .= getDescription($resource, $part);
786: if ($color) {$result .= "</b></font>"; }
787: }
788: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
789: $result .= '(randomly select ' . $resource->randompick() .')';
790: }
791:
792: $result .= " </td>\n";
793:
794: return $result;
1.51 bowersj2 795: }
796:
1.133 bowersj2 797: my @preparedColumns = (\&render_resource, \&render_communication_status,
798: \&render_quick_status, \&render_long_status);
1.132 bowersj2 799:
800: sub setDefault {
801: my ($val, $default) = @_;
802: if (!defined($val)) { return $default; }
803: return $val;
804: }
805:
806: sub render {
807: my $args = shift;
1.140 bowersj2 808: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
809: my $result = '';
810:
1.132 bowersj2 811: # Configure the renderer.
812: my $cols = $args->{'cols'};
813: if (!defined($cols)) {
814: # no columns, no nav maps.
815: return '';
816: }
1.140 bowersj2 817: my $mustCloseNavMap = 0;
818: my $navmap;
819: if (defined($args->{'navmap'})) {
820: $navmap = $args->{'navmap'};
821: }
822:
1.158 bowersj2 823: my $r = $args->{'r'};
1.140 bowersj2 824: my $queryString = $args->{'queryString'};
1.159 bowersj2 825: my $jump = $args->{'jump'};
1.158 bowersj2 826: my $here = $args->{'here'};
1.153 bowersj2 827: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
1.140 bowersj2 828: my $currentJumpDelta = 2; # change this to change how many resources are displayed
829: # before the current resource when using #current
830:
831: # If we were passed 'here' information, we are not rendering
832: # after a folder manipulation, and we were not passed an
833: # iterator, make sure we open the folders to show the "here"
834: # marker
835: my $filterHash = {};
836: # Figure out what we're not displaying
837: foreach (split(/\,/, $ENV{"form.filter"})) {
838: if ($_) {
839: $filterHash->{$_} = "1";
840: }
841: }
842:
843: my $condition = 0;
844: if ($ENV{'form.condition'}) {
845: $condition = 1;
846: }
847:
848: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
849: # Step 1: Check to see if we have a navmap
850: if (!defined($navmap)) {
1.171 bowersj2 851: $navmap = Apache::lonnavmaps::navmap->new(
1.140 bowersj2 852: $ENV{"request.course.fn"}.".db",
853: $ENV{"request.course.fn"}."_parms.db", 1, 1);
854: $mustCloseNavMap = 1;
855: }
856: $navmap->init();
857:
858: # Step two: Locate what kind of here marker is necessary
859: # Determine where the "here" marker is and where the screen jumps to.
860:
861: if ($ENV{'form.symb'}) {
862: $here = $jump = $ENV{'form.symb'};
863: } elsif ($ENV{'form.postdata'}) {
864: # couldn't find a symb, is there a URL?
865: my $currenturl = $ENV{'form.postdata'};
1.158 bowersj2 866: #$currenturl=~s/^http\:\/\///;
867: #$currenturl=~s/^[^\/]+//;
1.140 bowersj2 868:
1.158 bowersj2 869: $here = $jump = &Apache::lonnet::symbread($currenturl);
1.140 bowersj2 870: }
1.158 bowersj2 871:
1.140 bowersj2 872: # Step three: Ensure the folders are open
873: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
874: my $depth = 1;
875: $mapIterator->next(); # discard the first BEGIN_MAP
876: my $curRes = $mapIterator->next();
877: my $found = 0;
878:
879: # We only need to do this if we need to open the maps to show the
880: # current position. This will change the counter so we can't count
881: # for the jump marker with this loop.
882: while ($depth > 0 && !$found) {
883: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
884: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
885:
1.158 bowersj2 886: if (ref($curRes) && $curRes->symb() eq $here) {
1.140 bowersj2 887: my $mapStack = $mapIterator->getStack();
888:
889: # Ensure the parent maps are open
890: for my $map (@{$mapStack}) {
891: if ($condition) {
892: undef $filterHash->{$map->map_pc()};
893: } else {
894: $filterHash->{$map->map_pc()} = 1;
895: }
896: }
897: $found = 1;
898: }
899:
900: $curRes = $mapIterator->next();
901: }
1.159 bowersj2 902: }
1.140 bowersj2 903:
904: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
905: # If this is a click on a folder or something, we want to preserve the "here"
906: # from the querystring, and get the new "jump" marker
907: $here = $ENV{'form.here'};
908: $jump = $ENV{'form.jump'};
909: }
910:
1.132 bowersj2 911: my $it = $args->{'iterator'};
912: if (!defined($it)) {
1.140 bowersj2 913: # Construct a default iterator based on $ENV{'form.'} information
914:
915: # Step 1: Check to see if we have a navmap
916: if (!defined($navmap)) {
1.164 bowersj2 917: $navmap = Apache::lonnavmaps::navmap->new($r,
1.140 bowersj2 918: $ENV{"request.course.fn"}.".db",
919: $ENV{"request.course.fn"}."_parms.db", 1, 1);
920: $mustCloseNavMap = 1;
921: }
922: # Paranoia: Make sure it's ready
923: $navmap->init();
924:
1.144 bowersj2 925: # See if we're being passed a specific map
926: if ($args->{'iterator_map'}) {
927: my $map = $args->{'iterator_map'};
1.145 bowersj2 928: $map = $navmap->getResourceByUrl($map);
1.144 bowersj2 929: my $firstResource = $map->map_start();
930: my $finishResource = $map->map_finish();
931:
932: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
933: } else {
934: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
935: }
1.132 bowersj2 936: }
937:
1.159 bowersj2 938: # (re-)Locate the jump point, if any
939: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
940: my $depth = 1;
941: $mapIterator->next();
942: my $curRes = $mapIterator->next();
943: my $foundJump = 0;
944: my $counter = 0;
945:
946: while ($depth > 0 && !$foundJump) {
947: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
948: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
949: if (ref($curRes)) { $counter++; }
950:
951: if (ref($curRes) && $jump eq $curRes->symb()) {
952:
953: # This is why we have to use the main iterator instead of the
954: # potentially faster DFS: The count has to be the same, so
955: # the order has to be the same, which DFS won't give us.
956: $args->{'currentJumpIndex'} = $counter;
957: $foundJump = 1;
958: }
959:
960: $curRes = $mapIterator->next();
961: }
962:
1.132 bowersj2 963: my $showParts = setDefault($args->{'showParts'}, 1);
964: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1.139 bowersj2 965: # keeps track of when the current resource is found,
966: # so we can back up a few and put the anchor above the
967: # current resource
1.140 bowersj2 968: my $printKey = $args->{'printKey'};
969: my $printCloseAll = $args->{'printCloseAll'};
970: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1.143 bowersj2 971: my $filterFunc = setDefault($args->{'filterFunc'},
972: sub {return 1;});
1.144 bowersj2 973:
1.140 bowersj2 974: # Print key?
975: if ($printKey) {
976: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
977: my $date=localtime;
978: $result.='<tr><td align="right" valign="bottom">Key: </td>';
979: if ($navmap->{LAST_CHECK}) {
980: $result .=
981: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
982: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
983: '</td><td align="center" valign="bottom"> '.
984: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
985: '</td>';
986: } else {
987: $result .= '<td align="center" valign="bottom"> '.
988: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
989: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
990: '</td>';
991: }
992:
993: $result .= '</tr></table>';
994: }
995:
1.172 bowersj2 996: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1.140 bowersj2 997: if ($condition) {
998: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1.158 bowersj2 999: "&here=" . Apache::lonnet::escape($here) .
1.140 bowersj2 1000: "\">Close All Folders</a>";
1001: } else {
1002: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1.158 bowersj2 1003: "&here=" . Apache::lonnet::escape($here) .
1.140 bowersj2 1004: "\">Open All Folders</a>";
1005: }
1.143 bowersj2 1006: $result .= "<br /><br />\n";
1.140 bowersj2 1007: }
1008:
1009: if ($r) {
1010: $r->print($result);
1011: $r->rflush();
1012: $result = "";
1013: }
1.132 bowersj2 1014: # End parameter setting
1.133 bowersj2 1015:
1.132 bowersj2 1016: # Data
1.140 bowersj2 1017: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1.132 bowersj2 1018: my $res = "Apache::lonnavmaps::resource";
1019: my %condenseStatuses =
1020: ( $res->NETWORK_FAILURE => 1,
1021: $res->NOTHING_SET => 1,
1022: $res->CORRECT => 1 );
1023: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1.133 bowersj2 1024:
1025: # Shared variables
1026: $args->{'counter'} = 0; # counts the rows
1027: $args->{'indentLevel'} = 0;
1028: $args->{'isNewBranch'} = 0;
1029: $args->{'condensed'} = 0;
1030: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1031: $args->{'displayedHereMarker'} = 0;
1.132 bowersj2 1032:
1.133 bowersj2 1033: my $displayedJumpMarker = 0;
1.132 bowersj2 1034: # Set up iteration.
1.159 bowersj2 1035: $depth = 1;
1.132 bowersj2 1036: $it->next(); # discard initial BEGIN_MAP
1.159 bowersj2 1037: $curRes = $it->next();
1.132 bowersj2 1038: my $now = time();
1039: my $in24Hours = $now + 24 * 60 * 60;
1040: my $rownum = 0;
1041:
1.141 bowersj2 1042: # export "here" marker information
1043: $args->{'here'} = $here;
1044:
1.132 bowersj2 1045: while ($depth > 0) {
1046: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1047: if ($curRes == $it->END_MAP()) { $depth--; }
1048:
1049: # Maintain indentation level.
1050: if ($curRes == $it->BEGIN_MAP() ||
1051: $curRes == $it->BEGIN_BRANCH() ) {
1.133 bowersj2 1052: $args->{'indentLevel'}++;
1.132 bowersj2 1053: }
1054: if ($curRes == $it->END_MAP() ||
1055: $curRes == $it->END_BRANCH() ) {
1.133 bowersj2 1056: $args->{'indentLevel'}--;
1.132 bowersj2 1057: }
1058: # Notice new branches
1059: if ($curRes == $it->BEGIN_BRANCH()) {
1.133 bowersj2 1060: $args->{'isNewBranch'} = 1;
1061: }
1062:
1063: # If this isn't an actual resource, continue on
1064: if (!ref($curRes)) {
1065: next;
1.132 bowersj2 1066: }
1.133 bowersj2 1067:
1068: $args->{'counter'}++;
1.143 bowersj2 1069:
1070: # If this has been filtered out, continue on
1071: if (!(&$filterFunc($curRes))) {
1072: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1073: next;
1074: }
1.132 bowersj2 1075:
1.153 bowersj2 1076: # If we're suppressing navmaps and this is a navmap, continue on
1077: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1078: next;
1079: }
1080:
1.132 bowersj2 1081: # Does it have multiple parts?
1.133 bowersj2 1082: $args->{'multipart'} = 0;
1083: $args->{'condensed'} = 0;
1.132 bowersj2 1084: my @parts;
1085:
1086: # Decide what parts to show.
1.133 bowersj2 1087: if ($curRes->is_problem() && $showParts) {
1.132 bowersj2 1088: @parts = @{$curRes->parts()};
1.133 bowersj2 1089: $args->{'multipart'} = scalar(@parts) > 1;
1.132 bowersj2 1090:
1091: if ($condenseParts) { # do the condensation
1092: if (!$curRes->opendate("0")) {
1.162 bowersj2 1093: @parts = ();
1.133 bowersj2 1094: $args->{'condensed'} = 1;
1.132 bowersj2 1095: }
1.133 bowersj2 1096: if (!$args->{'condensed'}) {
1.132 bowersj2 1097: # Decide whether to condense based on similarity
1098: my $status = $curRes->status($parts[1]);
1099: my $due = $curRes->duedate($parts[1]);
1100: my $open = $curRes->opendate($parts[1]);
1101: my $statusAllSame = 1;
1102: my $dueAllSame = 1;
1103: my $openAllSame = 1;
1104: for (my $i = 2; $i < scalar(@parts); $i++) {
1105: if ($curRes->status($parts[$i]) != $status){
1106: $statusAllSame = 0;
1107: }
1108: if ($curRes->duedate($parts[$i]) != $due ) {
1109: $dueAllSame = 0;
1110: }
1111: if ($curRes->opendate($parts[$i]) != $open) {
1112: $openAllSame = 0;
1113: }
1114: }
1115: # $*allSame is true if all the statuses were
1116: # the same. Now, if they are all the same and
1117: # match one of the statuses to condense, or they
1118: # are all open with the same due date, or they are
1119: # all OPEN_LATER with the same open date, display the
1120: # status of the first non-zero part (to get the 'correct'
1121: # status right, since 0 is never 'correct' or 'open').
1122: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1123: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1124: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1.161 bowersj2 1125: @parts = ();
1.133 bowersj2 1126: $args->{'condensed'} = 1;
1.132 bowersj2 1127: }
1128:
1129: }
1130: }
1.157 bowersj2 1131: }
1.132 bowersj2 1132:
1133: # If the multipart problem was condensed, "forget" it was multipart
1134: if (scalar(@parts) == 1) {
1.133 bowersj2 1135: $args->{'multipart'} = 0;
1.132 bowersj2 1136: }
1137:
1138: # Now, we've decided what parts to show. Loop through them and
1139: # show them.
1.156 bowersj2 1140: foreach my $part ('', @parts) {
1141: if ($part eq '0') {
1142: next;
1143: }
1.132 bowersj2 1144: $rownum ++;
1145: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1146:
1147: $result .= " <tr bgcolor='$backgroundColor'>\n";
1.134 bowersj2 1148:
1149: # Set up some data about the parts that the cols might want
1150: my $filter = $it->{FILTER};
1151: my $stack = $it->getStack();
1152: my $src = getLinkForResource($stack);
1153:
1154: my $srcHasQuestion = $src =~ /\?/;
1155: $args->{"resourceLink"} = $src.
1156: ($srcHasQuestion?'&':'?') .
1.137 bowersj2 1157: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1.132 bowersj2 1158:
1159: # Now, display each column.
1160: foreach my $col (@$cols) {
1.139 bowersj2 1161: my $colHTML = '';
1162: if (ref($col)) {
1163: $colHTML .= &$col($curRes, $part, $args);
1164: } else {
1165: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1166: }
1.132 bowersj2 1167:
1.133 bowersj2 1168: # If this is the first column and it's time to print
1169: # the anchor, do so
1170: if ($col == $cols->[0] &&
1171: $args->{'counter'} == $args->{'currentJumpIndex'} -
1.139 bowersj2 1172: $currentJumpDelta) {
1173: # Jam the anchor after the <td> tag;
1174: # necessary for valid HTML (which Mozilla requires)
1175: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1.133 bowersj2 1176: $displayedJumpMarker = 1;
1177: }
1.139 bowersj2 1178: $result .= $colHTML . "\n";
1.132 bowersj2 1179: }
1.139 bowersj2 1180: $result .= " </tr>\n";
1.140 bowersj2 1181: $args->{'isNewBranch'} = 0;
1.139 bowersj2 1182: }
1.153 bowersj2 1183:
1.139 bowersj2 1184: if ($r && $rownum % 20 == 0) {
1185: $r->print($result);
1186: $result = "";
1187: $r->rflush();
1.132 bowersj2 1188: }
1.156 bowersj2 1189: } continue {
1.132 bowersj2 1190: $curRes = $it->next();
1191: }
1192:
1.134 bowersj2 1193: # Print out the part that jumps to #curloc if it exists
1.159 bowersj2 1194: # delay needed because the browser is processing the jump before
1195: # it finishes rendering, so it goes to the wrong place!
1196: # onload might be better, but this routine has no access to that.
1197: # On mozilla, the 0-millisecond timeout seems to prevent this;
1198: # it's quite likely this might fix other browsers, too, and
1199: # certainly won't hurt anything.
1.139 bowersj2 1200: if ($displayedJumpMarker) {
1.159 bowersj2 1201: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1.134 bowersj2 1202: }
1203:
1.132 bowersj2 1204: $result .= "</table>";
1.140 bowersj2 1205:
1206: if ($r) {
1207: $r->print($result);
1208: $result = "";
1209: $r->rflush();
1210: }
1211:
1.164 bowersj2 1212: #if ($mustCloseNavMap) { $navmap->untieHashes(); }
1.132 bowersj2 1213:
1214: return $result;
1215: }
1216:
1.133 bowersj2 1217: 1;
1218:
1219: package Apache::lonnavmaps::navmap;
1220:
1221: =pod
1222:
1223: lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, the Apache handler for the "Navigation Map" button, and a flexible prepared renderer for navigation maps that are easy to use anywhere.
1224:
1225: =head1 navmap object: Encapsulating the compiled nav map
1226:
1227: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
1228:
1229: Most notably it provides a way to navigate the map sensibly and a flexible iterator that makes it easy to write various renderers based on nav maps.
1230:
1231: You must obtain resource objects through the navmap object.
1232:
1233: =head2 Methods
1234:
1235: =over 4
1236:
1.168 bowersj2 1237: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1238: genMailDiscussStatus): Binds a new navmap object to the compiled nav map
1239: hash and parm hash given as filenames. genCourseAndUserOptions is a flag
1240: saying whether the course options and user options hash should be generated.
1241: This is for when you are using the parameters of the resources that require
1242: them; see documentation in resource object documentation. genMailDiscussStatus
1243: causes the nav map to retreive information about the email and discussion
1244: status of resources. Returns the navmap object if this is successful, or
1245: B<undef> if not. You must check for undef; errors will occur when you try
1246: to use the other methods otherwise.
1.133 bowersj2 1247:
1248: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
1249:
1250: =cut
1251:
1252: use strict;
1253: use GDBM_File;
1254:
1255: sub new {
1256: # magic invocation to create a class instance
1257: my $proto = shift;
1258: my $class = ref($proto) || $proto;
1259: my $self = {};
1260:
1261: $self->{NAV_HASH_FILE} = shift;
1262: $self->{PARM_HASH_FILE} = shift;
1263: $self->{GENERATE_COURSE_USER_OPT} = shift;
1264: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1265:
1266: # Resource cache stores navmap resources as we reference them. We generate
1267: # them on-demand so we don't pay for creating resources unless we use them.
1268: $self->{RESOURCE_CACHE} = {};
1269:
1270: # Network failure flag, if we accessed the course or user opt and
1271: # failed
1272: $self->{NETWORK_FAILURE} = 0;
1273:
1274: # tie the nav hash
1275:
1.168 bowersj2 1276: my %navmaphash;
1277: my %parmhash;
1278: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1.133 bowersj2 1279: &GDBM_READER(), 0640))) {
1280: return undef;
1281: }
1282:
1.168 bowersj2 1283: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1.133 bowersj2 1284: &GDBM_READER(), 0640)))
1285: {
1.170 matthew 1286: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1287: return undef;
1288: }
1289:
1.168 bowersj2 1290: $self->{NAV_HASH} = \%navmaphash;
1291: $self->{PARM_HASH} = \%parmhash;
1.140 bowersj2 1292: $self->{INITED} = 0;
1.133 bowersj2 1293:
1294: bless($self);
1295:
1296: return $self;
1297: }
1298:
1299: sub init {
1300: my $self = shift;
1.140 bowersj2 1301: if ($self->{INITED}) { return; }
1.133 bowersj2 1302:
1303: # If the course opt hash and the user opt hash should be generated,
1304: # generate them
1305: if ($self->{GENERATE_COURSE_USER_OPT}) {
1306: my $uname=$ENV{'user.name'};
1307: my $udom=$ENV{'user.domain'};
1308: my $uhome=$ENV{'user.home'};
1309: my $cid=$ENV{'request.course.id'};
1310: my $chome=$ENV{'course.'.$cid.'.home'};
1311: my ($cdom,$cnum)=split(/\_/,$cid);
1312:
1313: my $userprefix=$uname.'_'.$udom.'_';
1314:
1315: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1316: unless ($uhome eq 'no_host') {
1317: # ------------------------------------------------- Get coursedata (if present)
1318: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1319: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1320: ':resourcedata',$chome);
1321: if ($reply!~/^error\:/) {
1322: $courserdatas{$cid}=$reply;
1323: $courserdatas{$cid.'.last_cache'}=time;
1324: }
1325: # check to see if network failed
1326: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1327: {
1328: $self->{NETWORK_FAILURE} = 1;
1329: }
1330: }
1331: foreach (split(/\&/,$courserdatas{$cid})) {
1332: my ($name,$value)=split(/\=/,$_);
1333: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1334: &Apache::lonnet::unescape($value);
1335: }
1336: # --------------------------------------------------- Get userdata (if present)
1337: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1338: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1339: if ($reply!~/^error\:/) {
1340: $userrdatas{$uname.'___'.$udom}=$reply;
1341: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1342: }
1343: # check to see if network failed
1344: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1345: {
1346: $self->{NETWORK_FAILURE} = 1;
1347: }
1348: }
1349: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1350: my ($name,$value)=split(/\=/,$_);
1351: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1352: &Apache::lonnet::unescape($value);
1353: }
1354: $self->{COURSE_OPT} = \%courseopt;
1355: $self->{USER_OPT} = \%useropt;
1356: }
1357: }
1358:
1359: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1360: my $cid=$ENV{'request.course.id'};
1361: my ($cdom,$cnum)=split(/\_/,$cid);
1362:
1363: my %emailstatus = &Apache::lonnet::dump('email_status');
1364: my $logoutTime = $emailstatus{'logout'};
1365: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1366: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1367: $courseLeaveTime : $logoutTime);
1368: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1369: $cdom, $cnum);
1370: my %feedback=();
1371: my %error=();
1372: my $keys = &Apache::lonnet::reply('keys:'.
1373: $ENV{'user.domain'}.':'.
1374: $ENV{'user.name'}.':nohist_email',
1375: $ENV{'user.home'});
1376:
1377: foreach my $msgid (split(/\&/, $keys)) {
1378: $msgid=&Apache::lonnet::unescape($msgid);
1379: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1380: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1381: my ($what,$url)=($1,$2);
1382: my %status=
1383: &Apache::lonnet::get('email_status',[$msgid]);
1384: if ($status{$msgid}=~/^error\:/) {
1385: $status{$msgid}='';
1386: }
1387:
1388: if (($status{$msgid} eq 'new') ||
1389: (!$status{$msgid})) {
1390: if ($what eq 'Error') {
1391: $error{$url}.=','.$msgid;
1392: } else {
1393: $feedback{$url}.=','.$msgid;
1394: }
1395: }
1396: }
1397: }
1398:
1399: $self->{FEEDBACK} = \%feedback;
1400: $self->{ERROR_MSG} = \%error; # what is this? JB
1401: $self->{DISCUSSION_TIME} = \%discussiontime;
1402: $self->{EMAIL_STATUS} = \%emailstatus;
1403:
1404: }
1405:
1406: $self->{PARM_CACHE} = {};
1.140 bowersj2 1407: $self->{INITED} = 1;
1.133 bowersj2 1408: }
1409:
1410: # Internal function: Takes a key to look up in the nav hash and implements internal
1411: # memory caching of that key.
1412: sub navhash {
1413: my $self = shift; my $key = shift;
1414: return $self->{NAV_HASH}->{$key};
1415: }
1416:
1417: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1418: sub courseMapDefined {
1419: my $self = shift;
1420: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1421:
1422: my $firstres = $self->navhash("map_start_$uri");
1423: my $lastres = $self->navhash("map_finish_$uri");
1424: return $firstres && $lastres;
1425: }
1426:
1427: sub getIterator {
1428: my $self = shift;
1429: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1430: shift, undef, shift);
1431: return $iterator;
1432: }
1433:
1434: # unties the hash when done
1435: sub untieHashes {
1.168 bowersj2 1436: my $self = shift;
1.170 matthew 1437: untie %{$self->{NAV_HASH}};
1438: untie %{$self->{PARM_HASH}};
1.133 bowersj2 1439: }
1440:
1441: # Private method: Does the given resource (as a symb string) have
1442: # current discussion? Returns 0 if chat/mail data not extracted.
1443: sub hasDiscussion {
1444: my $self = shift;
1445: my $symb = shift;
1446: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1447:
1448: #return defined($self->{DISCUSSION_TIME}->{$symb});
1449: return $self->{DISCUSSION_TIME}->{$symb} >
1450: $self->{LAST_CHECK};
1451: }
1452:
1453: # Private method: Does the given resource (as a symb string) have
1454: # current feedback? Returns the string in the feedback hash, which
1455: # will be false if it does not exist.
1456: sub getFeedback {
1457: my $self = shift;
1458: my $symb = shift;
1459:
1460: if (!defined($self->{FEEDBACK})) { return ""; }
1461:
1462: return $self->{FEEDBACK}->{$symb};
1463: }
1464:
1465: # Private method: Get the errors for that resource (by source).
1466: sub getErrors {
1467: my $self = shift;
1468: my $src = shift;
1469:
1470: if (!defined($self->{ERROR_MSG})) { return ""; }
1471: return $self->{ERROR_MSG}->{$src};
1472: }
1473:
1474: =pod
1475:
1476: =item * B<getById>(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object.
1477:
1478: =cut
1479:
1480: # The strategy here is to cache the resource objects, and only construct them
1481: # as we use them. The real point is to prevent reading any more from the tied
1482: # hash then we have to, which should hopefully alleviate speed problems.
1483: # Caching is just an incidental detail I throw in because it makes sense.
1484:
1485: sub getById {
1486: my $self = shift;
1487: my $id = shift;
1488:
1489: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1490: {
1491: return $self->{RESOURCE_CACHE}->{$id};
1492: }
1493:
1494: # resource handles inserting itself into cache.
1495: # Not clear why the quotes are necessary, but as of this
1496: # writing it doesn't work without them.
1497: return "Apache::lonnavmaps::resource"->new($self, $id);
1.132 bowersj2 1498: }
1.133 bowersj2 1499:
1.172 bowersj2 1500: sub getBySymb {
1501: my $self = shift;
1502: my $symb = shift;
1503: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1504: my $map = $self->getResourceByUrl($mapUrl);
1505: return $self->getById($map->map_pc() . '.' . $id);
1506: }
1507:
1.133 bowersj2 1508: =pod
1509:
1510: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
1511:
1512: =cut
1513:
1514: sub firstResource {
1515: my $self = shift;
1516: my $firstResource = $self->navhash('map_start_' .
1517: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1518: return $self->getById($firstResource);
1.132 bowersj2 1519: }
1.133 bowersj2 1520:
1521: =pod
1522:
1523: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
1524:
1525: =cut
1526:
1527: sub finishResource {
1528: my $self = shift;
1529: my $firstResource = $self->navhash('map_finish_' .
1530: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1531: return $self->getById($firstResource);
1.132 bowersj2 1532: }
1.133 bowersj2 1533:
1534: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1535: # the actual lookup; parmval caches the results.
1536: sub parmval {
1537: my $self = shift;
1538: my ($what,$symb)=@_;
1539: my $hashkey = $what."|||".$symb;
1540:
1541: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1542: return $self->{PARM_CACHE}->{$hashkey};
1543: }
1544:
1545: my $result = $self->parmval_real($what, $symb);
1546: $self->{PARM_CACHE}->{$hashkey} = $result;
1547: return $result;
1.132 bowersj2 1548: }
1549:
1.133 bowersj2 1550: sub parmval_real {
1551: my $self = shift;
1552: my ($what,$symb) = @_;
1553:
1554: my $cid=$ENV{'request.course.id'};
1555: my $csec=$ENV{'request.course.sec'};
1556: my $uname=$ENV{'user.name'};
1557: my $udom=$ENV{'user.domain'};
1558:
1559: unless ($symb) { return ''; }
1560: my $result='';
1561:
1562: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1563:
1564: # ----------------------------------------------------- Cascading lookup scheme
1565: my $rwhat=$what;
1566: $what=~s/^parameter\_//;
1567: $what=~s/\_/\./;
1568:
1569: my $symbparm=$symb.'.'.$what;
1570: my $mapparm=$mapname.'___(all).'.$what;
1571: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1572:
1573: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1574: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1575: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1576:
1577: my $courselevel= $usercourseprefix.'.'.$what;
1578: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1579: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1580:
1581: my $useropt = $self->{USER_OPT};
1582: my $courseopt = $self->{COURSE_OPT};
1583: my $parmhash = $self->{PARM_HASH};
1584:
1585: # ---------------------------------------------------------- first, check user
1586: if ($uname and defined($useropt)) {
1587: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1588: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1589: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1590: }
1591:
1592: # ------------------------------------------------------- second, check course
1593: if ($csec and defined($courseopt)) {
1594: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1595: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1596: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1597: }
1598:
1599: if (defined($courseopt)) {
1600: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1601: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1602: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1603: }
1604:
1605: # ----------------------------------------------------- third, check map parms
1606:
1607: my $thisparm=$$parmhash{$symbparm};
1608: if (defined($thisparm)) { return $thisparm; }
1609:
1610: # ----------------------------------------------------- fourth , check default
1611:
1612: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1613: if (defined($default)) { return $default}
1614:
1615: # --------------------------------------------------- fifth , cascade up parts
1616:
1617: my ($space,@qualifier)=split(/\./,$rwhat);
1618: my $qualifier=join('.',@qualifier);
1619: unless ($space eq '0') {
1.160 albertel 1620: my @parts=split(/_/,$space);
1621: my $id=pop(@parts);
1622: my $part=join('_',@parts);
1623: if ($part eq '') { $part='0'; }
1624: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1625: if (defined($partgeneral)) { return $partgeneral; }
1.133 bowersj2 1626: }
1627: return '';
1.145 bowersj2 1628: }
1629:
1630: =pod
1631:
1632: =item * B<getResourceByUrl>(url): Retrieves a resource object by URL of the resource. If passed a resource object, it will simply return it, so it is safe to use this method in code like "$res = $navmap->getResourceByUrl($res)", if you're not sure if $res is already an object, or just a URL. If the resource appears multiple times in the course, only the first instance will be returned. As a result, this is probably useful only for maps.
1633:
1.173 ! albertel 1634: =item * B<retrieveResources>(map, filterFunc, recursive, bailout): The map is a specification of a map to retreive the resources from, either as a url or as an object. The filterFunc is a reference to a function that takes a resource object as its one argument and returns true if the resource should be included, or false if it should not be. If recursive is true, the map will be recursively examined, otherwise it will not be. If bailout is true, the function will return as soon as it finds a resource, if false it will finish. By default, the map is the top-level map of the course, filterFunc is a function that always returns 1, recursive is true, bailout is false. The resources will be returned in a list containing the resource objects for the corresponding resources, with B<no structure information> in the list; regardless of branching, recursion, etc., it will be a flat list.
1.145 bowersj2 1635:
1636: Thus, this is suitable for cases where you don't want the structure, just a list of all resources. It is also suitable for finding out how many resources match a given description; for this use, if all you want to know is if I<any> resources match the description, the bailout parameter will allow you to avoid potentially expensive enumeration of all matching resources.
1637:
1.146 bowersj2 1638: =item * B<hasResources>(map, filterFunc, recursive): Convience method for
1639:
1640: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
1641:
1642: which will tell whether the map has resources matching the description in the filter function.
1643:
1.145 bowersj2 1644: =cut
1645:
1646: sub getResourceByUrl {
1647: my $self = shift;
1648: my $resUrl = shift;
1649:
1650: if (ref($resUrl)) { return $resUrl; }
1651:
1652: $resUrl = &Apache::lonnet::clutter($resUrl);
1653: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1654: if ($resId =~ /,/) {
1655: $resId = (split (/,/, $resId))[0];
1656: }
1657: if (!$resId) { return ''; }
1658: return $self->getById($resId);
1659: }
1660:
1661: sub retrieveResources {
1662: my $self = shift;
1663: my $map = shift;
1664: my $filterFunc = shift;
1665: if (!defined ($filterFunc)) {
1666: $filterFunc = sub {return 1;};
1667: }
1668: my $recursive = shift;
1669: if (!defined($recursive)) { $recursive = 1; }
1670: my $bailout = shift;
1671: if (!defined($bailout)) { $bailout = 0; }
1672:
1673: # Create the necessary iterator.
1674: if (!ref($map)) { # assume it's a url of a map.
1.172 bowersj2 1675: $map = $self->getResourceByUrl($map);
1.145 bowersj2 1676: }
1677:
1678: # Check the map's validity.
1679: if (!$map || !$map->is_map()) {
1680: # Oh, to throw an exception.... how I'd love that!
1681: return ();
1682: }
1683:
1.146 bowersj2 1684: # Get an iterator.
1685: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1686: !$recursive);
1687:
1688: my @resources = ();
1689:
1690: # Run down the iterator and collect the resources.
1691: my $depth = 1;
1692: $it->next();
1693: my $curRes = $it->next();
1694:
1695: while ($depth > 0) {
1696: if ($curRes == $it->BEGIN_MAP()) {
1697: $depth++;
1698: }
1699: if ($curRes == $it->END_MAP()) {
1700: $depth--;
1701: }
1702:
1703: if (ref($curRes)) {
1704: if (!&$filterFunc($curRes)) {
1705: next;
1706: }
1707:
1708: push @resources, $curRes;
1709:
1710: if ($bailout) {
1711: return @resources;
1712: }
1713: }
1714:
1715: $curRes = $it->next();
1716: }
1717:
1718: return @resources;
1719: }
1720:
1721: sub hasResource {
1722: my $self = shift;
1723: my $map = shift;
1724: my $filterFunc = shift;
1725: my $recursive = shift;
1726:
1727: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1.133 bowersj2 1728: }
1.51 bowersj2 1729:
1730: 1;
1731:
1732: package Apache::lonnavmaps::iterator;
1733:
1734: =pod
1735:
1736: =back
1737:
1738: =head1 navmap Iterator
1739:
1740: An I<iterator> encapsulates the logic required to traverse a data structure. navmap uses an iterator to traverse the course map according to the criteria you wish to use.
1741:
1742: To obtain an iterator, call the B<getIterator>() function of a B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator directly.) This will return a reference to the iterator:
1743:
1744: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1745:
1746: To get the next thing from the iterator, call B<next>:
1747:
1748: C<my $nextThing = $resourceIterator-E<gt>next()>
1749:
1750: getIterator behaves as follows:
1751:
1752: =over 4
1753:
1.162 bowersj2 1754: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0. forceTop is a boolean value. If it is false (default), the iterator will only return the first level of map that is not just a single, 'redirecting' map. If true, the iterator will return all information, starting with the top-level map, regardless of content. returnTopMap, if true (default false), will cause the iterator to return the top-level map object (resource 0.0) before anything else.
1.51 bowersj2 1755:
1.101 bowersj2 1756: Thus, by default, only top-level resources will be shown. Change the condition to a 1 without changing the hash, and all resources will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively suppress parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively add parts of the nav map. See the handler code for examples.
1.51 bowersj2 1757:
1758: The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:
1759:
1760: =over 4
1761:
1.70 bowersj2 1762: =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
1763:
1764: =item * END_MAP: The map is now done.
1765:
1766: =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
1767:
1768: =item * END_BRANCH: The branch is now done.
1.51 bowersj2 1769:
1770: =back
1771:
1.70 bowersj2 1772: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
1773:
1.116 bowersj2 1774: Maps can contain empty resources. The iterator will automatically skip over such resources, but will still treat the structure correctly. Thus, a complicated map with several branches, but consisting entirely of empty resources except for one beginning or ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs, but only one resource will be returned.
1775:
1.70 bowersj2 1776: =back
1.51 bowersj2 1777:
1778: =cut
1779:
1780: # Here are the tokens for the iterator:
1781:
1782: sub BEGIN_MAP { return 1; } # begining of a new map
1783: sub END_MAP { return 2; } # end of the map
1784: sub BEGIN_BRANCH { return 3; } # beginning of a branch
1785: sub END_BRANCH { return 4; } # end of a branch
1.89 bowersj2 1786: sub FORWARD { return 1; } # go forward
1787: sub BACKWARD { return 2; }
1.51 bowersj2 1788:
1.96 bowersj2 1789: sub min {
1790: (my $a, my $b) = @_;
1791: if ($a < $b) { return $a; } else { return $b; }
1792: }
1793:
1.107 bowersj2 1794: # In the CVS repository, documentation of this algorithm is included
1795: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
1796: # will reference the same location in the text as the part of the
1797: # algorithm is running through.
1798:
1.94 bowersj2 1799: sub new {
1800: # magic invocation to create a class instance
1801: my $proto = shift;
1802: my $class = ref($proto) || $proto;
1803: my $self = {};
1804:
1805: $self->{NAV_MAP} = shift;
1806: return undef unless ($self->{NAV_MAP});
1807:
1808: # Handle the parameters
1809: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
1810: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
1811:
1812: # If the given resources are just the ID of the resource, get the
1813: # objects
1814: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
1815: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
1816: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
1817: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
1818:
1819: $self->{FILTER} = shift;
1820:
1821: # A hash, used as a set, of resource already seen
1822: $self->{ALREADY_SEEN} = shift;
1823: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1824: $self->{CONDITION} = shift;
1825:
1.116 bowersj2 1826: # Do we want to automatically follow "redirection" maps?
1827: $self->{FORCE_TOP} = shift;
1828:
1.162 bowersj2 1829: # Do we want to return the top-level map object (resource 0.0)?
1830: $self->{RETURN_0} = shift;
1831: # have we done that yet?
1832: $self->{HAVE_RETURNED_0} = 0;
1833:
1.94 bowersj2 1834: # Now, we need to pre-process the map, by walking forward and backward
1835: # over the parts of the map we're going to look at.
1.96 bowersj2 1836:
1.97 bowersj2 1837: # The processing steps are exactly the same, except for a few small
1838: # changes, so I bundle those up in the following list of two elements:
1839: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
1840: # first_resource).
1841: # This prevents writing nearly-identical code twice.
1842: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
1843: 'FIRST_RESOURCE'],
1844: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
1845: 'FINISH_RESOURCE'] );
1846:
1.98 bowersj2 1847: my $maxDepth = 0; # tracks max depth
1848:
1.116 bowersj2 1849: # If there is only one resource in this map, and it's a map, we
1850: # want to remember that, so the user can ask for the first map
1851: # that isn't just a redirector.
1852: my $resource; my $resourceCount = 0;
1853:
1.107 bowersj2 1854: # **1**
1855:
1.97 bowersj2 1856: foreach my $pass (@iterations) {
1857: my $direction = $pass->[0];
1858: my $valName = $pass->[1];
1859: my $nextResourceMethod = $pass->[2];
1860: my $firstResourceName = $pass->[3];
1861:
1862: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
1863: $self->{FIRST_RESOURCE},
1864: $self->{FINISH_RESOURCE},
1865: {}, undef, 0, $direction);
1.96 bowersj2 1866:
1.97 bowersj2 1867: # prime the recursion
1868: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
1.98 bowersj2 1869: my $depth = 0;
1.97 bowersj2 1870: $iterator->next();
1871: my $curRes = $iterator->next();
1.98 bowersj2 1872: while ($depth > -1) {
1.97 bowersj2 1873: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
1874: if ($curRes == $iterator->END_MAP()) { $depth--; }
1.96 bowersj2 1875:
1.97 bowersj2 1876: if (ref($curRes)) {
1.116 bowersj2 1877: # If there's only one resource, this will save it
1.117 bowersj2 1878: # we have to filter empty resources from consideration here,
1879: # or even "empty", redirecting maps have two (start & finish)
1880: # or three (start, finish, plus redirector)
1881: if($direction == FORWARD && $curRes->src()) {
1882: $resource = $curRes; $resourceCount++;
1883: }
1.97 bowersj2 1884: my $resultingVal = $curRes->{DATA}->{$valName};
1885: my $nextResources = $curRes->$nextResourceMethod();
1.116 bowersj2 1886: my $nextCount = scalar(@{$nextResources});
1.104 bowersj2 1887:
1.116 bowersj2 1888: if ($nextCount == 1) { # **3**
1.97 bowersj2 1889: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
1890: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
1891: }
1892:
1.116 bowersj2 1893: if ($nextCount > 1) { # **4**
1.97 bowersj2 1894: foreach my $res (@{$nextResources}) {
1895: my $current = $res->{DATA}->{$valName} || 999999999;
1896: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
1897: }
1898: }
1899: }
1.96 bowersj2 1900:
1.107 bowersj2 1901: # Assign the final val (**2**)
1.97 bowersj2 1902: if (ref($curRes) && $direction == BACKWARD()) {
1.98 bowersj2 1903: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
1904: $curRes->{DATA}->{BOT_UP_VAL});
1905:
1906: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
1907: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
1908: }
1.97 bowersj2 1909: $curRes = $iterator->next();
1.96 bowersj2 1910: }
1911: }
1.94 bowersj2 1912:
1.116 bowersj2 1913: # Check: Was this only one resource, a map?
1914: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
1915: my $firstResource = $resource->map_start();
1916: my $finishResource = $resource->map_finish();
1917: return
1918: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
1919: $finishResource, $self->{FILTER},
1920: $self->{ALREADY_SEEN},
1921: $self->{CONDITION}, 0);
1922:
1923: }
1924:
1.98 bowersj2 1925: # Set up some bookkeeping information.
1926: $self->{CURRENT_DEPTH} = 0;
1927: $self->{MAX_DEPTH} = $maxDepth;
1928: $self->{STACK} = [];
1929: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1930:
1931: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
1932: push @{$self->{STACK}}, [];
1933: }
1934:
1.107 bowersj2 1935: # Prime the recursion w/ the first resource **5**
1.98 bowersj2 1936: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
1937: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
1938:
1939: bless ($self);
1940:
1941: return $self;
1942: }
1943:
1944: sub next {
1945: my $self = shift;
1.162 bowersj2 1946:
1947: # If we want to return the top-level map object, and haven't yet,
1948: # do so.
1949: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
1950: $self->{HAVE_RETURNED_0} = 1;
1951: return $self->{NAV_MAP}->getById('0.0');
1952: }
1.98 bowersj2 1953:
1954: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1955: # grab the next from the recursive iterator
1956: my $next = $self->{RECURSIVE_ITERATOR}->next();
1957:
1958: # is it a begin or end map? If so, update the depth
1959: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
1960: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
1961:
1962: # Are we back at depth 0? If so, stop recursing
1963: if ($self->{RECURSIVE_DEPTH} == 0) {
1964: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
1965: }
1966:
1967: return $next;
1968: }
1969:
1970: if (defined($self->{FORCE_NEXT})) {
1971: my $tmp = $self->{FORCE_NEXT};
1972: $self->{FORCE_NEXT} = undef;
1973: return $tmp;
1974: }
1975:
1976: # Have we not yet begun? If not, return BEGIN_MAP and
1977: # remember we've started.
1978: if ( !$self->{STARTED} ) {
1979: $self->{STARTED} = 1;
1980: return $self->BEGIN_MAP();
1981: }
1982:
1983: # Here's the guts of the iterator.
1984:
1985: # Find the next resource, if any.
1986: my $found = 0;
1987: my $i = $self->{MAX_DEPTH};
1988: my $newDepth;
1989: my $here;
1990: while ( $i >= 0 && !$found ) {
1.107 bowersj2 1991: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
1992: $here = pop @{$self->{STACK}->[$i]}; # **7**
1.98 bowersj2 1993: $found = 1;
1994: $newDepth = $i;
1995: }
1996: $i--;
1997: }
1998:
1999: # If we still didn't find anything, we're done.
2000: if ( !$found ) {
2001: # We need to get back down to the correct branch depth
2002: if ( $self->{CURRENT_DEPTH} > 0 ) {
2003: $self->{CURRENT_DEPTH}--;
2004: return END_BRANCH();
2005: } else {
2006: return END_MAP();
2007: }
2008: }
2009:
1.104 bowersj2 2010: # If this is not a resource, it must be an END_BRANCH marker we want
2011: # to return directly.
1.107 bowersj2 2012: if (!ref($here)) { # **8**
1.104 bowersj2 2013: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2014: $self->{CURRENT_DEPTH}--;
2015: return $here;
2016: }
2017: }
2018:
2019: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2020: $self->{HERE} = $here;
2021:
1.98 bowersj2 2022: # Get to the right level
2023: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2024: push @{$self->{STACK}->[$newDepth]}, $here;
2025: $self->{CURRENT_DEPTH}--;
2026: return END_BRANCH();
2027: }
2028: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2029: push @{$self->{STACK}->[$newDepth]}, $here;
2030: $self->{CURRENT_DEPTH}++;
2031: return BEGIN_BRANCH();
2032: }
2033:
2034: # If we made it here, we have the next resource, and we're at the
2035: # right branch level. So let's examine the resource for where
2036: # we can get to from here.
2037:
2038: # So we need to look at all the resources we can get to from here,
2039: # categorize them if we haven't seen them, remember if we have a new
2040: my $nextUnfiltered = $here->getNext();
1.104 bowersj2 2041: my $maxDepthAdded = -1;
2042:
1.98 bowersj2 2043: for (@$nextUnfiltered) {
2044: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
1.104 bowersj2 2045: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2046: push @{$self->{STACK}->[$depth]}, $_;
1.98 bowersj2 2047: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
1.104 bowersj2 2048: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
1.98 bowersj2 2049: }
2050: }
1.104 bowersj2 2051:
2052: # Is this the end of a branch? If so, all of the resources examined above
2053: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2054: # marker onto the stack so we don't forget.
2055: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2056: # BC branch and gets to C, it will see F as the only next resource, but it's
2057: # one level lower. Thus, this is the end of the branch, since there are no
2058: # more resources added to this level or above.
1.111 bowersj2 2059: # We don't do this if the examined resource is the finish resource,
2060: # because the condition given above is true, but the "END_MAP" will
2061: # take care of things and we should already be at depth 0.
1.104 bowersj2 2062: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
1.111 bowersj2 2063: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
1.104 bowersj2 2064: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2065: }
2066:
1.98 bowersj2 2067: # That ends the main iterator logic. Now, do we want to recurse
2068: # down this map (if this resource is a map)?
2069: if ($self->{HERE}->is_map() &&
2070: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2071: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2072: my $firstResource = $self->{HERE}->map_start();
2073: my $finishResource = $self->{HERE}->map_finish();
2074:
2075: $self->{RECURSIVE_ITERATOR} =
2076: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2077: $finishResource, $self->{FILTER},
2078: $self->{ALREADY_SEEN}, $self->{CONDITION});
2079: }
2080:
1.116 bowersj2 2081: # If this is a blank resource, don't actually return it.
1.117 bowersj2 2082: # Should you ever find you need it, make sure to add an option to the code
2083: # that you can use; other things depend on this behavior.
1.138 bowersj2 2084: my $browsePriv = $self->{HERE}->browsePriv();
2085: if (!$self->{HERE}->src() ||
2086: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
1.116 bowersj2 2087: return $self->next();
2088: }
2089:
1.98 bowersj2 2090: return $self->{HERE};
2091:
2092: }
2093:
2094: =pod
2095:
2096: The other method available on the iterator is B<getStack>, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map).
2097:
2098: =cut
2099:
2100: sub getStack {
2101: my $self=shift;
2102:
2103: my @stack;
2104:
2105: $self->populateStack(\@stack);
2106:
2107: return \@stack;
2108: }
2109:
2110: # Private method: Calls the iterators recursively to populate the stack.
2111: sub populateStack {
2112: my $self=shift;
2113: my $stack = shift;
2114:
2115: push @$stack, $self->{HERE} if ($self->{HERE});
2116:
2117: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2118: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2119: }
1.94 bowersj2 2120: }
2121:
2122: 1;
2123:
2124: package Apache::lonnavmaps::DFSiterator;
2125:
1.100 bowersj2 2126: # Not documented in the perldoc: This is a simple iterator that just walks
2127: # through the nav map and presents the resources in a depth-first search
2128: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2129: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2130: # useful for pre-processing of some kind, and is in fact used by the main
2131: # iterator that way, but that's about it.
2132: # One could imagine merging this into the init routine of the main iterator,
2133: # but this might as well be left seperate, since it is possible some other
2134: # use might be found for it. - Jeremy
1.94 bowersj2 2135:
1.117 bowersj2 2136: # Unlike the main iterator, this DOES return all resources, even blank ones.
2137: # The main iterator needs them to correctly preprocess the map.
2138:
1.94 bowersj2 2139: sub BEGIN_MAP { return 1; } # begining of a new map
2140: sub END_MAP { return 2; } # end of the map
2141: sub FORWARD { return 1; } # go forward
2142: sub BACKWARD { return 2; }
2143:
1.100 bowersj2 2144: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2145: # filter hash ref (or undef), already seen hash or undef, condition
2146: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
1.51 bowersj2 2147: sub new {
2148: # magic invocation to create a class instance
2149: my $proto = shift;
2150: my $class = ref($proto) || $proto;
2151: my $self = {};
2152:
2153: $self->{NAV_MAP} = shift;
2154: return undef unless ($self->{NAV_MAP});
2155:
2156: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2157: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2158:
2159: # If the given resources are just the ID of the resource, get the
2160: # objects
2161: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2162: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2163: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2164: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2165:
2166: $self->{FILTER} = shift;
2167:
2168: # A hash, used as a set, of resource already seen
2169: $self->{ALREADY_SEEN} = shift;
1.140 bowersj2 2170: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
1.63 bowersj2 2171: $self->{CONDITION} = shift;
1.89 bowersj2 2172: $self->{DIRECTION} = shift || FORWARD();
1.51 bowersj2 2173:
1.100 bowersj2 2174: # Flag: Have we started yet?
1.51 bowersj2 2175: $self->{STARTED} = 0;
2176:
2177: # Should we continue calling the recursive iterator, if any?
2178: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2179: # The recursive iterator, if any
2180: $self->{RECURSIVE_ITERATOR} = undef;
2181: # Are we recursing on a map, or a branch?
2182: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2183: # And the count of how deep it is, so that this iterator can keep track of
2184: # when to pick back up again.
2185: $self->{RECURSIVE_DEPTH} = 0;
2186:
2187: # For keeping track of our branches, we maintain our own stack
1.100 bowersj2 2188: $self->{STACK} = [];
1.51 bowersj2 2189:
2190: # Start with the first resource
1.89 bowersj2 2191: if ($self->{DIRECTION} == FORWARD) {
1.100 bowersj2 2192: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
1.89 bowersj2 2193: } else {
1.100 bowersj2 2194: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
1.89 bowersj2 2195: }
1.51 bowersj2 2196:
2197: bless($self);
2198: return $self;
2199: }
2200:
2201: sub next {
2202: my $self = shift;
2203:
2204: # Are we using a recursive iterator? If so, pull from that and
2205: # watch the depth; we want to resume our level at the correct time.
1.98 bowersj2 2206: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
1.51 bowersj2 2207: # grab the next from the recursive iterator
2208: my $next = $self->{RECURSIVE_ITERATOR}->next();
2209:
2210: # is it a begin or end map? Update depth if so
2211: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2212: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2213:
2214: # Are we back at depth 0? If so, stop recursing.
2215: if ($self->{RECURSIVE_DEPTH} == 0) {
2216: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2217: }
2218:
2219: return $next;
2220: }
2221:
2222: # Is there a current resource to grab? If not, then return
1.100 bowersj2 2223: # END_MAP, which will end the iterator.
2224: if (scalar(@{$self->{STACK}}) == 0) {
2225: return $self->END_MAP();
1.51 bowersj2 2226: }
2227:
2228: # Have we not yet begun? If not, return BEGIN_MAP and
2229: # remember that we've started.
2230: if ( !$self->{STARTED} ) {
2231: $self->{STARTED} = 1;
2232: return $self->BEGIN_MAP;
2233: }
2234:
2235: # Get the next resource in the branch
1.100 bowersj2 2236: $self->{HERE} = pop @{$self->{STACK}};
1.52 bowersj2 2237:
1.100 bowersj2 2238: # remember that we've seen this, so we don't return it again later
1.51 bowersj2 2239: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2240:
2241: # Get the next possible resources
1.90 bowersj2 2242: my $nextUnfiltered;
1.89 bowersj2 2243: if ($self->{DIRECTION} == FORWARD()) {
1.90 bowersj2 2244: $nextUnfiltered = $self->{HERE}->getNext();
1.89 bowersj2 2245: } else {
1.90 bowersj2 2246: $nextUnfiltered = $self->{HERE}->getPrevious();
1.89 bowersj2 2247: }
1.51 bowersj2 2248: my $next = [];
2249:
2250: # filter the next possibilities to remove things we've
1.100 bowersj2 2251: # already seen.
1.51 bowersj2 2252: foreach (@$nextUnfiltered) {
1.52 bowersj2 2253: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2254: push @$next, $_;
2255: }
1.51 bowersj2 2256: }
2257:
2258: while (@$next) {
1.100 bowersj2 2259: # copy the next possibilities over to the stack
2260: push @{$self->{STACK}}, shift @$next;
1.51 bowersj2 2261: }
2262:
2263: # If this is a map and we want to recurse down it... (not filtered out)
1.70 bowersj2 2264: if ($self->{HERE}->is_map() &&
1.63 bowersj2 2265: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
1.51 bowersj2 2266: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2267: my $firstResource = $self->{HERE}->map_start();
2268: my $finishResource = $self->{HERE}->map_finish();
2269:
2270: $self->{RECURSIVE_ITERATOR} =
1.94 bowersj2 2271: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
1.63 bowersj2 2272: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
1.91 bowersj2 2273: $self->{CONDITION}, $self->{DIRECTION});
1.51 bowersj2 2274: }
2275:
2276: return $self->{HERE};
2277: }
2278:
1.1 www 2279: 1;
1.2 www 2280:
1.51 bowersj2 2281: package Apache::lonnavmaps::resource;
2282:
2283: use Apache::lonnet;
2284:
2285: =pod
2286:
2287: =head1 Object: resource
2288:
2289: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
2290:
2291: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
2292:
1.140 bowersj2 2293: You will probably never need to instantiate this object directly. Use Apache::lonnavmaps::navmap, and use the "start" method to obtain the starting resource.
1.51 bowersj2 2294:
2295: =head2 Public Members
2296:
2297: resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash.
2298:
2299: =head2 Methods
2300:
2301: =over 4
2302:
1.70 bowersj2 2303: =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. Very rarely, if ever, called directly. Use the nav map->getByID() method.
2304:
2305: =back
1.51 bowersj2 2306:
2307: =cut
2308:
2309: sub new {
2310: # magic invocation to create a class instance
2311: my $proto = shift;
2312: my $class = ref($proto) || $proto;
2313: my $self = {};
2314:
2315: $self->{NAV_MAP} = shift;
2316: $self->{ID} = shift;
2317:
2318: # Store this new resource in the parent nav map's cache.
2319: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
1.66 bowersj2 2320: $self->{RESOURCE_ERROR} = 0;
1.51 bowersj2 2321:
2322: # A hash that can be used by two-pass algorithms to store data
2323: # about this resource in. Not used by the resource object
2324: # directly.
2325: $self->{DATA} = {};
2326:
2327: bless($self);
2328:
2329: return $self;
2330: }
2331:
1.70 bowersj2 2332: # private function: simplify the NAV_HASH lookups we keep doing
2333: # pass the name, and to automatically append my ID, pass a true val on the
2334: # second param
2335: sub navHash {
2336: my $self = shift;
2337: my $param = shift;
2338: my $id = shift;
1.115 bowersj2 2339: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
1.70 bowersj2 2340: }
2341:
1.51 bowersj2 2342: =pod
2343:
1.70 bowersj2 2344: B<Metadata Retreival>
2345:
1.101 bowersj2 2346: These are methods that help you retrieve metadata about the resource: Method names are based on the fields in the compiled course representation.
1.70 bowersj2 2347:
2348: =over 4
2349:
1.106 bowersj2 2350: =item * B<compTitle>: Returns a "composite title", that is equal to $res->title() if the resource has a title, and is otherwise the last part of the URL (e.g., "problem.problem").
2351:
1.70 bowersj2 2352: =item * B<ext>: Returns true if the resource is external.
2353:
2354: =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
2355:
2356: =item * B<kind>: Returns the kind of the resource from the compiled nav map.
2357:
1.101 bowersj2 2358: =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. In other words, this is usually false.
1.51 bowersj2 2359:
1.70 bowersj2 2360: =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
2361:
2362: =item * B<src>: Returns the source for the resource.
2363:
2364: =item * B<symb>: Returns the symb for the resource.
2365:
2366: =item * B<title>: Returns the title of the resource.
2367:
2368: =item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
1.51 bowersj2 2369:
2370: =back
2371:
2372: =cut
2373:
2374: # These info functions can be used directly, as they don't return
2375: # resource information.
1.85 bowersj2 2376: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
1.70 bowersj2 2377: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
1.85 bowersj2 2378: sub from { my $self=shift; return $self->navHash("from_", 1); }
1.51 bowersj2 2379: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2380: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
1.68 bowersj2 2381: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2382: sub randompick {
2383: my $self = shift;
2384: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2385: '.0.parameter_randompick'};
2386: }
1.51 bowersj2 2387: sub src {
2388: my $self=shift;
2389: return $self->navHash("src_", 1);
2390: }
2391: sub symb {
2392: my $self=shift;
2393: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2394: my $symbSrc = &Apache::lonnet::declutter($self->src());
2395: return &Apache::lonnet::declutter(
2396: $self->navHash('map_id_'.$first))
2397: . '___' . $second . '___' . $symbSrc;
2398: }
1.70 bowersj2 2399: sub title { my $self=shift; return $self->navHash("title_", 1); }
2400: sub to { my $self=shift; return $self->navHash("to_", 1); }
1.106 bowersj2 2401: sub compTitle {
2402: my $self = shift;
2403: my $title = $self->title();
2404: if (!$title) {
2405: $title = $self->src();
2406: $title = substr($title, rindex($title, '/') + 1);
2407: }
2408: return $title;
2409: }
1.70 bowersj2 2410: =pod
2411:
2412: B<Predicate Testing the Resource>
2413:
2414: These methods are shortcuts to deciding if a given resource has a given property.
2415:
2416: =over 4
2417:
2418: =item * B<is_map>: Returns true if the resource is a map type.
2419:
2420: =item * B<is_problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field; might need more to work correctly.)
2421:
2422: =item * B<is_page>: Returns true if the resource is a page.
2423:
1.101 bowersj2 2424: =item * B<is_sequence>: Returns true if the resource is a sequence.
1.70 bowersj2 2425:
2426: =back
2427:
2428: =cut
2429:
2430:
2431: sub is_html {
1.51 bowersj2 2432: my $self=shift;
2433: my $src = $self->src();
1.70 bowersj2 2434: return ($src =~ /html$/);
1.51 bowersj2 2435: }
1.70 bowersj2 2436: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2437: sub is_page {
1.51 bowersj2 2438: my $self=shift;
2439: my $src = $self->src();
1.70 bowersj2 2440: return ($src =~ /page$/);
1.51 bowersj2 2441: }
1.70 bowersj2 2442: sub is_problem {
1.51 bowersj2 2443: my $self=shift;
2444: my $src = $self->src();
1.70 bowersj2 2445: return ($src =~ /problem$/);
1.51 bowersj2 2446: }
1.70 bowersj2 2447: sub is_sequence {
1.51 bowersj2 2448: my $self=shift;
2449: my $src = $self->src();
1.70 bowersj2 2450: return ($src =~ /sequence$/);
1.51 bowersj2 2451: }
2452:
1.101 bowersj2 2453: # Private method: Shells out to the parmval in the nav map, handler parts.
1.51 bowersj2 2454: sub parmval {
2455: my $self = shift;
2456: my $what = shift;
2457: my $part = shift || "0";
2458: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2459: }
2460:
1.70 bowersj2 2461: =pod
2462:
2463: B<Map Methods>
2464:
2465: These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
2466:
2467: =over 4
2468:
2469: =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
2470:
2471: =item * B<map_pc>: Returns the pc value of the map, which is the first number that appears in the resource ID of the resources in the map, and is the number that appears around the middle of the symbs of the resources in that map.
2472:
2473: =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
2474:
2475: =item * B<map_type>: Returns a string with the type of the map in it.
2476:
2477: =back
1.51 bowersj2 2478:
1.70 bowersj2 2479: =cut
1.51 bowersj2 2480:
2481: sub map_finish {
2482: my $self = shift;
2483: my $src = $self->src();
1.144 bowersj2 2484: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 2485: my $res = $self->navHash("map_finish_$src", 0);
2486: $res = $self->{NAV_MAP}->getById($res);
2487: return $res;
2488: }
1.70 bowersj2 2489: sub map_pc {
2490: my $self = shift;
2491: my $src = $self->src();
2492: return $self->navHash("map_pc_$src", 0);
2493: }
1.51 bowersj2 2494: sub map_start {
2495: my $self = shift;
2496: my $src = $self->src();
1.144 bowersj2 2497: $src = Apache::lonnet::clutter($src);
1.51 bowersj2 2498: my $res = $self->navHash("map_start_$src", 0);
2499: $res = $self->{NAV_MAP}->getById($res);
2500: return $res;
2501: }
2502: sub map_type {
2503: my $self = shift;
2504: my $pc = $self->map_pc();
2505: return $self->navHash("map_type_$pc", 0);
2506: }
2507:
2508:
2509:
2510: #####
2511: # Property queries
2512: #####
2513:
2514: # These functions will be responsible for returning the CORRECT
2515: # VALUE for the parameter, no matter what. So while they may look
2516: # like direct calls to parmval, they can be more then that.
2517: # So, for instance, the duedate function should use the "duedatetype"
2518: # information, rather then the resource object user.
2519:
2520: =pod
2521:
2522: =head2 Resource Parameters
2523:
1.70 bowersj2 2524: In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to part "0", but can be directed to another part by passing the part as the parameter.
1.51 bowersj2 2525:
2526: These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)
2527:
2528: =over 4
2529:
2530: =item * B<acc>: Get the Client IP/Name Access Control information.
2531:
2532: =item * B<answerdate>: Get the answer-reveal date for the problem.
2533:
2534: =item * B<duedate>: Get the due date for the problem.
2535:
2536: =item * B<tries>: Get the number of tries the student has used on the problem.
2537:
2538: =item * B<maxtries>: Get the number of max tries allowed.
2539:
2540: =item * B<opendate>: Get the open date for the problem.
2541:
2542: =item * B<sig>: Get the significant figures setting.
2543:
2544: =item * B<tol>: Get the tolerance for the problem.
2545:
1.70 bowersj2 2546: =item * B<tries>: Get the number of tries the user has already used on the problem.
2547:
1.51 bowersj2 2548: =item * B<type>: Get the question type for the problem.
2549:
2550: =item * B<weight>: Get the weight for the problem.
2551:
2552: =back
2553:
2554: =cut
2555:
2556: sub acc {
2557: (my $self, my $part) = @_;
2558: return $self->parmval("acc", $part);
2559: }
2560: sub answerdate {
2561: (my $self, my $part) = @_;
2562: # Handle intervals
2563: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2564: return $self->duedate($part) +
2565: $self->parmval("answerdate", $part);
2566: }
2567: return $self->parmval("answerdate", $part);
1.106 bowersj2 2568: }
1.108 bowersj2 2569: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
1.51 bowersj2 2570: sub duedate {
2571: (my $self, my $part) = @_;
2572: return $self->parmval("duedate", $part);
2573: }
2574: sub maxtries {
2575: (my $self, my $part) = @_;
2576: return $self->parmval("maxtries", $part);
2577: }
2578: sub opendate {
2579: (my $self, my $part) = @_;
2580: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2581: return $self->duedate($part) -
2582: $self->parmval("opendate", $part);
2583: }
2584: return $self->parmval("opendate");
2585: }
2586: sub sig {
2587: (my $self, my $part) = @_;
2588: return $self->parmval("sig", $part);
2589: }
2590: sub tol {
2591: (my $self, my $part) = @_;
2592: return $self->parmval("tol", $part);
2593: }
1.108 bowersj2 2594: sub tries {
2595: my $self = shift;
2596: my $tries = $self->queryRestoreHash('tries', shift);
2597: if (!defined($tries)) { return '0';}
1.51 bowersj2 2598: return $tries;
2599: }
1.70 bowersj2 2600: sub type {
2601: (my $self, my $part) = @_;
2602: return $self->parmval("type", $part);
2603: }
1.109 bowersj2 2604: sub weight {
2605: my $self = shift; my $part = shift;
1.70 bowersj2 2606: return $self->parmval("weight", $part);
2607: }
1.51 bowersj2 2608:
2609: # Multiple things need this
2610: sub getReturnHash {
2611: my $self = shift;
2612:
2613: if (!defined($self->{RETURN_HASH})) {
1.84 bowersj2 2614: my %tmpHash = &Apache::lonnet::restore($self->symb());
1.51 bowersj2 2615: $self->{RETURN_HASH} = \%tmpHash;
2616: }
2617: }
2618:
2619: ######
2620: # Status queries
2621: ######
2622:
2623: # These methods query the status of problems.
2624:
2625: # If we need to count parts, this function determines the number of
2626: # parts from the metadata. When called, it returns a reference to a list
2627: # of strings corresponding to the parts. (Thus, using it in a scalar context
2628: # tells you how many parts you have in the problem:
2629: # $partcount = scalar($resource->countParts());
2630: # Don't use $self->{PARTS} directly because you don't know if it's been
2631: # computed yet.
2632:
2633: =pod
2634:
2635: =head2 Resource misc
2636:
2637: Misc. functions for the resource.
2638:
2639: =over 4
2640:
1.59 bowersj2 2641: =item * B<hasDiscussion>: Returns a false value if there has been discussion since the user last logged in, true if there has. Always returns false if the discussion data was not extracted when the nav map was constructed.
2642:
2643: =item * B<getFeedback>: Gets the feedback for the resource and returns the raw feedback string for the resource, or the null string if there is no feedback or the email data was not extracted when the nav map was constructed. Usually used like this:
2644:
2645: for (split(/\,/, $res->getFeedback())) {
2646: my $link = &Apache::lonnet::escape($_);
2647: ...
2648:
2649: and use the link as appropriate.
2650:
2651: =cut
2652:
2653: sub hasDiscussion {
2654: my $self = shift;
2655: return $self->{NAV_MAP}->hasDiscussion($self->symb());
2656: }
2657:
2658: sub getFeedback {
2659: my $self = shift;
1.124 bowersj2 2660: my $source = $self->src();
1.125 bowersj2 2661: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
1.124 bowersj2 2662: return $self->{NAV_MAP}->getFeedback($source);
2663: }
2664:
2665: sub getErrors {
2666: my $self = shift;
2667: my $source = $self->src();
2668: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
2669: return $self->{NAV_MAP}->getErrors($source);
1.59 bowersj2 2670: }
2671:
2672: =pod
2673:
1.142 bowersj2 2674: =item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater than two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. Filtering part 0 if you want it is up to you.)
1.51 bowersj2 2675:
1.70 bowersj2 2676: =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0. Thus, B<parts> may return an array with fewer parts in it then countParts might lead you to believe.
1.51 bowersj2 2677:
2678: =back
2679:
2680: =cut
2681:
2682: sub parts {
2683: my $self = shift;
2684:
1.67 bowersj2 2685: if ($self->ext) { return ['0']; }
2686:
1.51 bowersj2 2687: $self->extractParts();
2688: return $self->{PARTS};
2689: }
2690:
2691: sub countParts {
2692: my $self = shift;
2693:
2694: my $parts = $self->parts();
1.163 bowersj2 2695: my $delta = 0;
2696: for my $part (@$parts) {
2697: if ($part eq '0') { $delta--; }
2698: }
1.66 bowersj2 2699:
2700: if ($self->{RESOURCE_ERROR}) {
2701: return 0;
2702: }
2703:
1.163 bowersj2 2704: return scalar(@{$parts}) + $delta;
1.51 bowersj2 2705: }
2706:
2707: # Private function: Extracts the parts information and saves it
2708: sub extractParts {
2709: my $self = shift;
2710:
1.153 bowersj2 2711: return if (defined($self->{PARTS}));
1.67 bowersj2 2712: return if ($self->ext);
1.51 bowersj2 2713:
2714: $self->{PARTS} = [];
2715:
1.82 bowersj2 2716: # Retrieve part count, if this is a problem
2717: if ($self->is_problem()) {
1.152 matthew 2718: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
1.82 bowersj2 2719: if (!$metadata) {
2720: $self->{RESOURCE_ERROR} = 1;
2721: $self->{PARTS} = [];
2722: return;
2723: }
2724: foreach (split(/\,/,$metadata)) {
1.152 matthew 2725: if ($_ =~ /^part_(.*)$/) {
1.147 bowersj2 2726: my $part = $1;
2727: # check to see if part is turned off.
1.149 matthew 2728: if (! Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
1.147 bowersj2 2729: push @{$self->{PARTS}}, $1;
2730: }
1.82 bowersj2 2731: }
1.51 bowersj2 2732: }
1.82 bowersj2 2733:
2734:
2735: my @sortedParts = sort @{$self->{PARTS}};
2736: $self->{PARTS} = \@sortedParts;
1.154 bowersj2 2737: }
2738:
1.51 bowersj2 2739: return;
2740: }
2741:
2742: =pod
2743:
2744: =head2 Resource Status
2745:
1.101 bowersj2 2746: Problem resources have status information, reflecting their various dates and completion statuses.
1.51 bowersj2 2747:
2748: There are two aspects to the status: the date-related information and the completion information.
2749:
2750: Idiomatic usage of these two methods would probably look something like
2751:
2752: foreach ($resource->parts()) {
2753: my $dateStatus = $resource->getDateStatus($_);
2754: my $completionStatus = $resource->getCompletionStatus($_);
2755:
1.70 bowersj2 2756: or
2757:
2758: my $status = $resource->status($_);
2759:
1.51 bowersj2 2760: ... use it here ...
2761: }
2762:
1.101 bowersj2 2763: Which you use depends on exactly what you are looking for. The status() function has been optimized for the nav maps display and may not precisely match what you need elsewhere.
2764:
2765: The symbolic constants shown below can be accessed through the resource object: $res->OPEN.
2766:
1.51 bowersj2 2767: =over 4
2768:
1.70 bowersj2 2769: =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:
1.51 bowersj2 2770:
2771: =back
2772:
2773: B<Date Codes>
2774:
2775: =over 4
2776:
2777: =item * B<OPEN_LATER>: The problem will be opened later.
2778:
2779: =item * B<OPEN>: Open and not yet due.
2780:
1.59 bowersj2 2781:
1.54 bowersj2 2782: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
2783:
2784: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51 bowersj2 2785:
2786: =item * B<ANSWER_OPEN>: The answer date is here.
2787:
2788: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
2789:
2790: =back
2791:
2792: =cut
2793:
2794: # Apparently the compiler optimizes these into constants automatically
1.54 bowersj2 2795: sub OPEN_LATER { return 0; }
2796: sub OPEN { return 1; }
2797: sub PAST_DUE_NO_ANSWER { return 2; }
2798: sub PAST_DUE_ANSWER_LATER { return 3; }
2799: sub ANSWER_OPEN { return 4; }
2800: sub NOTHING_SET { return 5; }
2801: sub NETWORK_FAILURE { return 100; }
2802:
2803: # getDateStatus gets the date status for a given problem part.
2804: # Because answer date, due date, and open date are fully independent
2805: # (i.e., it is perfectly possible to *only* have an answer date),
2806: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
2807: # (past, future, none given). This function handles this with a decision
2808: # tree. Read the comments to follow the decision tree.
1.51 bowersj2 2809:
2810: sub getDateStatus {
2811: my $self = shift;
2812: my $part = shift;
2813: $part = "0" if (!defined($part));
1.54 bowersj2 2814:
2815: # Always return network failure if there was one.
1.51 bowersj2 2816: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2817:
2818: my $now = time();
2819:
1.53 bowersj2 2820: my $open = $self->opendate($part);
2821: my $due = $self->duedate($part);
2822: my $answer = $self->answerdate($part);
2823:
2824: if (!$open && !$due && !$answer) {
2825: # no data on the problem at all
2826: # should this be the same as "open later"? think multipart.
2827: return $self->NOTHING_SET;
2828: }
1.59 bowersj2 2829: if (!$open || $now < $open) {return $self->OPEN_LATER}
2830: if (!$due || $now < $due) {return $self->OPEN}
2831: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
2832: if ($answer) { return $self->ANSWER_OPEN; }
1.54 bowersj2 2833: return PAST_DUE_NO_ANSWER;
1.51 bowersj2 2834: }
2835:
2836: =pod
2837:
2838: B<>
2839:
2840: =over 4
2841:
2842: =item * B<getCompletionStatus>($part): ($part defaults to 0.) A convenience function that returns a symbolic constant telling you about the completion status of the part, with the following possible results:
2843:
2844: =back
2845:
2846: B<Completion Codes>
2847:
2848: =over 4
2849:
2850: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
2851:
2852: =item * B<INCORRECT>: Attempted, but wrong by student.
2853:
2854: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
2855:
2856: =item * B<CORRECT>: Correct or correct by instructor.
2857:
2858: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
2859:
2860: =item * B<EXCUSED>: Excused. Not yet implemented.
2861:
2862: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
2863:
1.69 bowersj2 2864: =item * B<ATTEMPTED>: Attempted, and not yet graded.
2865:
1.51 bowersj2 2866: =back
2867:
2868: =cut
2869:
1.53 bowersj2 2870: sub NOT_ATTEMPTED { return 10; }
2871: sub INCORRECT { return 11; }
2872: sub INCORRECT_BY_OVERRIDE { return 12; }
2873: sub CORRECT { return 13; }
2874: sub CORRECT_BY_OVERRIDE { return 14; }
2875: sub EXCUSED { return 15; }
1.69 bowersj2 2876: sub ATTEMPTED { return 16; }
1.51 bowersj2 2877:
2878: sub getCompletionStatus {
2879: my $self = shift;
2880: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2881:
1.108 bowersj2 2882: my $status = $self->queryRestoreHash('solved', shift);
1.51 bowersj2 2883:
2884: # Left as seperate if statements in case we ever do more with this
2885: if ($status eq 'correct_by_student') {return $self->CORRECT;}
2886: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
2887: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
2888: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
2889: if ($status eq 'excused') {return $self->EXCUSED; }
1.69 bowersj2 2890: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
1.51 bowersj2 2891: return $self->NOT_ATTEMPTED;
1.108 bowersj2 2892: }
2893:
2894: sub queryRestoreHash {
2895: my $self = shift;
2896: my $hashentry = shift;
2897: my $part = shift;
2898: $part = "0" if (!defined($part));
2899: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
2900:
2901: $self->getReturnHash();
2902:
2903: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
1.51 bowersj2 2904: }
2905:
2906: =pod
2907:
2908: B<Composite Status>
2909:
1.101 bowersj2 2910: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):
1.51 bowersj2 2911:
2912: =over 4
2913:
1.70 bowersj2 2914: =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
1.51 bowersj2 2915:
1.70 bowersj2 2916: =item * B<NOTHING_SET>: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)
1.53 bowersj2 2917:
1.70 bowersj2 2918: =item * B<CORRECT>: For any reason at all, the part is considered correct.
1.51 bowersj2 2919:
1.70 bowersj2 2920: =item * B<EXCUSED>: For any reason at all, the problem is excused.
1.51 bowersj2 2921:
1.70 bowersj2 2922: =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
1.54 bowersj2 2923:
1.70 bowersj2 2924: =item * B<PAST_DUE_ANSWER_LATER>: The problem is past due, not considered correct, and an answer date in the future is set.
1.51 bowersj2 2925:
1.70 bowersj2 2926: =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
1.51 bowersj2 2927:
1.70 bowersj2 2928: =item * B<OPEN_LATER>: The problem is not yet open.
1.51 bowersj2 2929:
1.70 bowersj2 2930: =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
1.51 bowersj2 2931:
1.70 bowersj2 2932: =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
1.51 bowersj2 2933:
1.70 bowersj2 2934: =item * B<OPEN>: The item is open and not yet tried.
1.51 bowersj2 2935:
1.70 bowersj2 2936: =item * B<ATTEMPTED>: The problem has been attempted.
1.69 bowersj2 2937:
1.51 bowersj2 2938: =back
2939:
2940: =cut
2941:
2942: sub TRIES_LEFT { return 10; }
2943:
2944: sub status {
2945: my $self = shift;
2946: my $part = shift;
2947: if (!defined($part)) { $part = "0"; }
2948: my $completionStatus = $self->getCompletionStatus($part);
2949: my $dateStatus = $self->getDateStatus($part);
2950:
2951: # What we have is a two-dimensional matrix with 4 entries on one
2952: # dimension and 5 entries on the other, which we want to colorize,
1.54 bowersj2 2953: # plus network failure and "no date data at all".
1.51 bowersj2 2954:
1.53 bowersj2 2955: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51 bowersj2 2956:
2957: # There are a few whole rows we can dispose of:
1.53 bowersj2 2958: if ($completionStatus == CORRECT ||
2959: $completionStatus == CORRECT_BY_OVERRIDE ) {
1.69 bowersj2 2960: return CORRECT;
2961: }
2962:
2963: if ($completionStatus == ATTEMPTED) {
2964: return ATTEMPTED;
1.53 bowersj2 2965: }
2966:
2967: # If it's EXCUSED, then return that no matter what
2968: if ($completionStatus == EXCUSED) {
2969: return EXCUSED;
1.51 bowersj2 2970: }
2971:
1.53 bowersj2 2972: if ($dateStatus == NOTHING_SET) {
2973: return NOTHING_SET;
1.51 bowersj2 2974: }
2975:
1.69 bowersj2 2976: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
2977: # by 4 matrix (date statuses).
1.51 bowersj2 2978:
1.54 bowersj2 2979: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59 bowersj2 2980: $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54 bowersj2 2981: return $dateStatus;
1.51 bowersj2 2982: }
2983:
1.53 bowersj2 2984: if ($dateStatus == ANSWER_OPEN) {
2985: return ANSWER_OPEN;
1.51 bowersj2 2986: }
2987:
2988: # Now: (incorrect, incorrect_override, not_attempted) x
2989: # (open_later), (open)
2990:
1.53 bowersj2 2991: if ($dateStatus == OPEN_LATER) {
2992: return OPEN_LATER;
1.51 bowersj2 2993: }
2994:
2995: # If it's WRONG...
1.53 bowersj2 2996: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51 bowersj2 2997: # and there are TRIES LEFT:
1.79 bowersj2 2998: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
1.53 bowersj2 2999: return TRIES_LEFT;
1.51 bowersj2 3000: }
1.53 bowersj2 3001: return INCORRECT; # otherwise, return orange; student can't fix this
1.51 bowersj2 3002: }
3003:
3004: # Otherwise, it's untried and open
1.53 bowersj2 3005: return OPEN;
1.51 bowersj2 3006: }
3007:
3008: =pod
3009:
3010: =head2 Resource/Nav Map Navigation
3011:
3012: =over 4
3013:
1.101 bowersj2 3014: =item * B<getNext>(): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case.
1.85 bowersj2 3015:
1.101 bowersj2 3016: =item * B<getPrevious>(): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case.
1.51 bowersj2 3017:
3018: =cut
3019:
3020: sub getNext {
3021: my $self = shift;
3022: my @branches;
3023: my $to = $self->to();
1.85 bowersj2 3024: foreach my $branch ( split(/,/, $to) ) {
1.51 bowersj2 3025: my $choice = $self->{NAV_MAP}->getById($branch);
3026: my $next = $choice->goesto();
3027: $next = $self->{NAV_MAP}->getById($next);
3028:
1.131 bowersj2 3029: push @branches, $next;
1.85 bowersj2 3030: }
3031: return \@branches;
3032: }
3033:
3034: sub getPrevious {
3035: my $self = shift;
3036: my @branches;
3037: my $from = $self->from();
3038: foreach my $branch ( split /,/, $from) {
3039: my $choice = $self->{NAV_MAP}->getById($branch);
3040: my $prev = $choice->comesfrom();
3041: $prev = $self->{NAV_MAP}->getById($prev);
3042:
1.131 bowersj2 3043: push @branches, $prev;
1.51 bowersj2 3044: }
3045: return \@branches;
1.131 bowersj2 3046: }
3047:
3048: sub browsePriv {
3049: my $self = shift;
3050: if (defined($self->{BROWSE_PRIV})) {
3051: return $self->{BROWSE_PRIV};
3052: }
3053:
3054: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
1.51 bowersj2 3055: }
3056:
3057: =pod
1.2 www 3058:
1.51 bowersj2 3059: =back
1.2 www 3060:
1.51 bowersj2 3061: =cut
1.2 www 3062:
1.51 bowersj2 3063: 1;
1.2 www 3064:
1.51 bowersj2 3065: __END__
1.2 www 3066:
3067:
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