1: # The LearningOnline Network with CAPA
2: # Navigate Maps Handler
3: #
4: # $Id: lonnavmaps.pm,v 1.183 2003/04/25 18:54:36 bowersj2 Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # (Page Handler
29: #
30: # (TeX Content Handler
31: #
32: # 05/29/00,05/30 Gerd Kortemeyer)
33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
35: #
36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
37: # YEAR=2002
38: # 1/1 Gerd Kortemeyer
39: # Oct-Nov Jeremy Bowers
40: # YEAR=2003
41: # Jeremy Bowers ... lots of days
42:
43: package Apache::lonnavmaps;
44:
45: use strict;
46: use Apache::Constants qw(:common :http);
47: use Apache::loncommon();
48: use Apache::lonmenu();
49: use POSIX qw (floor strftime);
50:
51: # symbolic constants
52: sub SYMB { return 1; }
53: sub URL { return 2; }
54: sub NOTHING { return 3; }
55:
56: # Some data
57:
58: my $resObj = "Apache::lonnavmaps::resource";
59:
60: # Keep these mappings in sync with lonquickgrades, which uses the colors
61: # instead of the icons.
62: my %statusIconMap =
63: ( $resObj->NETWORK_FAILURE => '',
64: $resObj->NOTHING_SET => '',
65: $resObj->CORRECT => 'navmap.correct.gif',
66: $resObj->EXCUSED => 'navmap.correct.gif',
67: $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
68: $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
69: $resObj->ANSWER_OPEN => 'navmap.wrong.gif',
70: $resObj->OPEN_LATER => '',
71: $resObj->TRIES_LEFT => 'navmap.open.gif',
72: $resObj->INCORRECT => 'navmap.wrong.gif',
73: $resObj->OPEN => 'navmap.open.gif',
74: $resObj->ATTEMPTED => 'navmap.open.gif' );
75:
76: my %iconAltTags =
77: ( 'navmap.correct.gif' => 'Correct',
78: 'navmap.wrong.gif' => 'Incorrect',
79: 'navmap.open.gif' => 'Open' );
80:
81: # Defines a status->color mapping, null string means don't color
82: my %colormap =
83: ( $resObj->NETWORK_FAILURE => '',
84: $resObj->CORRECT => '',
85: $resObj->EXCUSED => '#3333FF',
86: $resObj->PAST_DUE_ANSWER_LATER => '',
87: $resObj->PAST_DUE_NO_ANSWER => '',
88: $resObj->ANSWER_OPEN => '#006600',
89: $resObj->OPEN_LATER => '',
90: $resObj->TRIES_LEFT => '',
91: $resObj->INCORRECT => '',
92: $resObj->OPEN => '',
93: $resObj->NOTHING_SET => '' );
94: # And a special case in the nav map; what to do when the assignment
95: # is not yet done and due in less then 24 hours
96: my $hurryUpColor = "#FF0000";
97:
98: sub handler {
99: my $r = shift;
100: real_handler($r);
101: }
102:
103: sub real_handler {
104: my $r = shift;
105:
106: # Handle header-only request
107: if ($r->header_only) {
108: if ($ENV{'browser.mathml'}) {
109: $r->content_type('text/xml');
110: } else {
111: $r->content_type('text/html');
112: }
113: $r->send_http_header;
114: return OK;
115: }
116:
117: # Send header, don't cache this page
118: if ($ENV{'browser.mathml'}) {
119: $r->content_type('text/xml');
120: } else {
121: $r->content_type('text/html');
122: }
123: &Apache::loncommon::no_cache($r);
124: $r->send_http_header;
125:
126: # Create the nav map
127: my $navmap = Apache::lonnavmaps::navmap->new(
128: $ENV{"request.course.fn"}.".db",
129: $ENV{"request.course.fn"}."_parms.db", 1, 1);
130:
131:
132: if (!defined($navmap)) {
133: my $requrl = $r->uri;
134: $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
135: return HTTP_NOT_ACCEPTABLE;
136: }
137:
138: $r->print("<html><head>\n");
139: $r->print("<title>Navigate Course Contents</title>");
140: # ------------------------------------------------------------ Get query string
141: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
142:
143: # ----------------------------------------------------- Force menu registration
144: my $addentries='';
145: if ($ENV{'form.register'}) {
146: $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
147: '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
148: $r->print(&Apache::lonmenu::registerurl(1));
149: }
150:
151: # Header
152: $r->print('</head>'.
153: &Apache::loncommon::bodytag('Navigate Course Contents','',
154: $addentries,'','',$ENV{'form.register'}));
155: $r->print('<script>window.focus();</script>');
156:
157: $r->rflush();
158:
159: # Now that we've displayed some stuff to the user, init the navmap
160: $navmap->init();
161:
162: $r->print('<br> ');
163: $r->rflush();
164:
165: # Check that it's defined
166: if (!($navmap->courseMapDefined())) {
167: $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
168: '</body></html>');
169: return OK;
170: }
171:
172: # See if there's only one map in the top-level, if we don't
173: # already have a filter... if so, automatically display it
174: if ($ENV{QUERY_STRING} !~ /filter/) {
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. We know the condition because
196: # the defined($ENV{'form.filter'}) also ensures this
197: # is a fresh call.
198: $ENV{'form.filter'} = "$sequenceId";
199: }
200: }
201:
202: # renderer call
203: my $render = render({ 'cols' => [0,1,2,3],
204: 'url' => '/adm/navmaps',
205: 'navmap' => $navmap,
206: 'suppressNavmap' => 1,
207: 'r' => $r});
208:
209: $navmap->untieHashes();
210:
211: $r->print("</body></html>");
212: $r->rflush();
213:
214: return OK;
215: }
216:
217: # Convenience functions: Returns a string that adds or subtracts
218: # the second argument from the first hash, appropriate for the
219: # query string that determines which folders to recurse on
220: sub addToFilter {
221: my $hashIn = shift;
222: my $addition = shift;
223: my %hash = %$hashIn;
224: $hash{$addition} = 1;
225:
226: return join (",", keys(%hash));
227: }
228:
229: sub removeFromFilter {
230: my $hashIn = shift;
231: my $subtraction = shift;
232: my %hash = %$hashIn;
233:
234: delete $hash{$subtraction};
235: return join(",", keys(%hash));
236: }
237:
238: # Convenience function: Given a stack returned from getStack on the iterator,
239: # return the correct src() value.
240: # Later, this should add an anchor when we start putting anchors in pages.
241: sub getLinkForResource {
242: my $stack = shift;
243: my $res;
244:
245: # Check to see if there are any pages in the stack
246: foreach $res (@$stack) {
247: if (defined($res) && $res->is_page()) {
248: return $res->src();
249: }
250: }
251:
252: # Failing that, return the src of the last resource that is defined
253: # (when we first recurse on a map, it puts an undefined resource
254: # on the bottom because $self->{HERE} isn't defined yet, and we
255: # want the src for the map anyhow)
256: foreach (@$stack) {
257: if (defined($_)) { $res = $_; }
258: }
259:
260: return $res->src();
261: }
262:
263: # Convenience function: This seperates the logic of how to create
264: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
265: # etc.) into a seperate function. It takes a resource object as the
266: # first parameter, and the part number of the resource as the second.
267: # It's basically a big switch statement on the status of the resource.
268:
269: sub getDescription {
270: my $res = shift;
271: my $part = shift;
272: my $status = $res->status($part);
273:
274: if ($status == $res->NETWORK_FAILURE) {
275: return "Having technical difficulties; please check status later";
276: }
277: if ($status == $res->NOTHING_SET) {
278: return "Not currently assigned.";
279: }
280: if ($status == $res->OPEN_LATER) {
281: return "Open " . timeToHumanString($res->opendate($part));
282: }
283: if ($status == $res->OPEN) {
284: if ($res->duedate($part)) {
285: return "Due " . timeToHumanString($res->duedate($part));
286: } else {
287: return "Open, no due date";
288: }
289: }
290: if ($status == $res->PAST_DUE_ANSWER_LATER) {
291: return "Answer open " . timeToHumanString($res->answerdate($part));
292: }
293: if ($status == $res->PAST_DUE_NO_ANSWER) {
294: return "Was due " . timeToHumanString($res->duedate($part));
295: }
296: if ($status == $res->ANSWER_OPEN) {
297: return "Answer available";
298: }
299: if ($status == $res->EXCUSED) {
300: return "Excused by instructor";
301: }
302: if ($status == $res->ATTEMPTED) {
303: return "Not yet graded.";
304: }
305: if ($status == $res->TRIES_LEFT) {
306: my $tries = $res->tries($part);
307: my $maxtries = $res->maxtries($part);
308: my $triesString = "";
309: if ($tries && $maxtries) {
310: $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
311: if ($maxtries > 1 && $maxtries - $tries == 1) {
312: $triesString = "<b>$triesString</b>";
313: }
314: }
315: if ($res->duedate()) {
316: return "Due " . timeToHumanString($res->duedate($part)) .
317: " $triesString";
318: } else {
319: return "No due date $triesString";
320: }
321: }
322: }
323:
324: # Convenience function, so others can use it: Is the problem due in less then
325: # 24 hours, and still can be done?
326:
327: sub dueInLessThen24Hours {
328: my $res = shift;
329: my $part = shift;
330: my $status = $res->status($part);
331:
332: return ($status == $res->OPEN() || $status == $res->ATTEMPTED() ||
333: $status == $res->TRIES_LEFT()) &&
334: $res->duedate() && $res->duedate() < time()+(24*60*60) &&
335: $res->duedate() > time();
336: }
337:
338: # Convenience function, so others can use it: Is there only one try remaining for the
339: # part, with more then one try to begin with, not due yet and still can be done?
340: sub lastTry {
341: my $res = shift;
342: my $part = shift;
343:
344: my $tries = $res->tries($part);
345: my $maxtries = $res->maxtries($part);
346: return $tries && $maxtries && $maxtries > 1 &&
347: $maxtries - $tries == 1 && $res->duedate() &&
348: $res->duedate() > time();
349: }
350:
351: # This puts a human-readable name on the ENV variable.
352:
353: sub advancedUser {
354: return $ENV{'request.role.adv'};
355: }
356:
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 $timestring"
364: # Very, very, very, VERY English-only... goodness help a localizer on
365: # this func...
366: sub timeToHumanString {
367: my ($time) = @_;
368: # zero, '0' and blank are bad times
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 ) {
399:
400: my $tense = $inPast ? " ago" : "";
401: my $prefix = $inPast ? "" : "in ";
402:
403: # Less then a minute
404: if ( $delta < $minute ) {
405: if ($delta == 1) { return "${prefix}1 second$tense"; }
406: return "$prefix$delta seconds$tense";
407: }
408:
409: # Less then an hour
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 ) {
439: my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
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;
460: }
461: }
462:
463:
464: =pod
465:
466: =head1 NAME
467:
468: Apache::lonnavmap - Subroutines to handle and render the navigation maps
469:
470: =head1 SYNOPSIS
471:
472: The main handler generates the navigational listing for the course,
473: the other objects export this information in a usable fashion for
474: other modules
475:
476: =head1 Object: render
477:
478: The navmap renderer package provides a sophisticated rendering of the
479: standard navigation maps interface into HTML. The provided nav map
480: handler is actually just a glorified call to this.
481:
482: Because of the large number of parameters this function presents,
483: instead of passing it arguments as is normal, pass it in an anonymous
484: hash with the given options. This is because there is no obvious order
485: you may wish to override these in and a hash is easier to read and
486: understand then "undef, undef, undef, 1, undef, undef, renderButton,
487: undef, 0" when you mostly want default behaviors.
488:
489: The package provides a function called 'render', called as
490: Apache::lonnavmaps::renderer->render({}).
491:
492: =head2 Overview of Columns
493:
494: The renderer will build an HTML table for the navmap and return
495: it. The table is consists of several columns, and a row for each
496: resource (or possibly each part). You tell the renderer how many
497: columns to create and what to place in each column, optionally using
498: one or more of the preparent columns, and the renderer will assemble
499: the table.
500:
501: Any additional generally useful column types should be placed in the
502: renderer code here, so anybody can use it anywhere else. Any code
503: specific to the current application (such as the addition of <input>
504: elements in a column) should be placed in the code of the thing using
505: the renderer.
506:
507: At the core of the renderer is the array reference COLS (see Example
508: section below for how to pass this correctly). The COLS array will
509: consist of entries of one of two types of things: Either an integer
510: representing one of the pre-packaged column types, or a sub reference
511: that takes a resource reference, a part number, and a reference to the
512: argument hash passed to the renderer, and returns a string that will
513: be inserted into the HTML representation as it.
514:
515: The pre-packaged column names are refered to by constants in the
516: Apache::lonnavmaps::renderer namespace. The following currently exist:
517:
518: =over 4
519:
520: =item * B<resource>:
521:
522: The general info about the resource: Link, icon for the type, etc. The
523: first column in the standard nav map display. This column also accepts
524: the following parameter in the renderer hash:
525:
526: =over 4
527:
528: =item * B<resource_nolink>:
529:
530: If true, the resource will not be linked. Default: false, resource
531: will have links.
532:
533: =item * B<resource_part_count>:
534:
535: If true (default), the resource will show a part count if the full
536: part list is not displayed. If false, the resource will never show a
537: part count.
538:
539: =item * B<resource_no_folder_link>:
540:
541: If true, the resource's folder will not be clickable to open or close
542: it. Default is false. True implies printCloseAll is false, since you
543: can't close or open folders when this is on anyhow.
544:
545: =back
546:
547: =item B<communication_status>:
548:
549: Whether there is discussion on the resource, email for the user, or
550: (lumped in here) perl errors in the execution of the problem. This is
551: the second column in the main nav map.
552:
553: =item B<quick_status>:
554:
555: An icon for the status of a problem, with four possible states:
556: Correct, incorrect, open, or none (not open yet, not a problem). The
557: third column of the standard navmap.
558:
559: =item B<long_status>:
560:
561: A text readout of the details of the current status of the problem,
562: such as "Due in 22 hours". The fourth column of the standard navmap.
563:
564: =back
565:
566: If you add any others please be sure to document them here.
567:
568: An example of a column renderer that will show the ID number of a
569: resource, along with the part name if any:
570:
571: sub {
572: my ($resource, $part, $params) = @_;
573: if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
574: return '<td>' . $resource->{ID} . '</td>';
575: }
576:
577: Note these functions are responsible for the TD tags, which allow them
578: to override vertical and horizontal alignment, etc.
579:
580: =head2 Parameters
581:
582: Most of these parameters are only useful if you are *not* using the
583: folder interface (i.e., the default first column), which is probably
584: the common case. If you are using this interface, then you should be
585: able to get away with just using 'cols' (to specify the columns
586: shown), 'url' (necessary for the folders to link to the current screen
587: correctly), and possibly 'queryString' if your app calls for it. In
588: that case, maintaining the state of the folders will be done
589: automatically.
590:
591: =over 4
592:
593: =item * B<iterator>:
594:
595: A reference to a fresh ::iterator to use from the navmaps. The
596: rendering will reflect the options passed to the iterator, so you can
597: use that to just render a certain part of the course, if you like. If
598: one is not passed, the renderer will attempt to construct one from
599: ENV{'form.filter'} and ENV{'form.condition'} information, plus the
600: 'iterator_map' parameter if any.
601:
602: =item * B<iterator_map>:
603:
604: If you are letting the renderer do the iterator handling, you can
605: instruct the renderer to render only a particular map by passing it
606: the source of the map you want to process, like
607: '/res/103/jerf/navmap.course.sequence'.
608:
609: =item * B<navmap>:
610:
611: A reference to a navmap, used only if an iterator is not passed in. If
612: this is necessary to make an iterator but it is not passed in, a new
613: one will be constructed based on ENV info. This is useful to do basic
614: error checking before passing it off to render.
615:
616: =item * B<r>:
617:
618: The standard Apache response object. This must be passed to the
619: renderer or the course hash will be locked.
620:
621: =item * B<cols>:
622:
623: An array reference
624:
625: =item * B<showParts>:
626:
627: A flag. If yes (default), a line for the resource itself, and a line
628: for each part will be displayed. If not, only one line for each
629: resource will be displayed.
630:
631: =item * B<condenseParts>:
632:
633: A flag. If yes (default), if all parts of the problem have the same
634: status and that status is Nothing Set, Correct, or Network Failure,
635: then only one line will be displayed for that resource anyhow. If no,
636: all parts will always be displayed. If showParts is 0, this is
637: ignored.
638:
639: =item * B<jumpCount>:
640:
641: A string identifying the URL to place the anchor 'curloc' at. Default
642: to no anchor at all. It is the responsibility of the renderer user to
643: ensure that the #curloc is in the URL. By default, determined through
644: the use of the ENV{} 'jump' information, and should normally "just
645: work" correctly.
646:
647: =item * B<here>:
648:
649: A Symb identifying where to place the 'here' marker. Default empty,
650: which means no marker.
651:
652: =item * B<indentString>:
653:
654: A string identifying the indentation string to use. By default, this
655: is a 25 pixel whitespace image with no alt text.
656:
657: =item * B<queryString>:
658:
659: A string which will be prepended to the query string used when the
660: folders are opened or closed.
661:
662: =item * B<url>:
663:
664: The url the folders will link to, which should be the current
665: page. Required if the resource info column is shown.
666:
667: =item * B<currentJumpIndex>:
668:
669: Describes the currently-open row number to cause the browser to jump
670: to, because the user just opened that folder. By default, pulled from
671: the Jump information in the ENV{'form.*'}.
672:
673: =item * B<printKey>:
674:
675: If true, print the key that appears on the top of the standard
676: navmaps. Default is false.
677:
678: =item * B<printCloseAll>:
679:
680: If true, print the "Close all folders" or "open all folders"
681: links. Default is true.
682:
683: =item * B<filterFunc>:
684:
685: A function that takes the resource object as its only parameter and
686: returns a true or false value. If true, the resource is displayed. If
687: false, it is simply skipped in the display. By default, all resources
688: are shown.
689:
690: =item * B<suppressNavmaps>:
691:
692: If true, will not display Navigate Content resources. Default to
693: false.
694:
695: =back
696:
697: =head2 Additional Info
698:
699: In addition to the parameters you can pass to the renderer, which will
700: be passed through unchange to the column renderers, the renderer will
701: generate the following information which your renderer may find
702: useful:
703:
704: If you want to know how many rows were printed, the 'counter' element
705: of the hash passed into the render function will contain the
706: count. You may want to check whether any resources were printed at
707: all.
708:
709: =over 4
710:
711: =back
712:
713: =cut
714:
715: sub resource { return 0; }
716: sub communication_status { return 1; }
717: sub quick_status { return 2; }
718: sub long_status { return 3; }
719:
720: # Data for render_resource
721:
722: sub render_resource {
723: my ($resource, $part, $params) = @_;
724:
725: my $nonLinkedText = ''; # stuff after resource title not in link
726:
727: my $link = $params->{"resourceLink"};
728: my $src = $resource->src();
729: my $it = $params->{"iterator"};
730: my $filter = $it->{FILTER};
731:
732: my $title = $resource->compTitle();
733: if ($src =~ /^\/uploaded\//) {
734: $nonLinkedText=$title;
735: $title = '';
736: }
737: my $partLabel = "";
738: my $newBranchText = "";
739:
740: # If this is a new branch, label it so
741: if ($params->{'isNewBranch'}) {
742: $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
743: }
744:
745: # links to open and close the folder
746: my $linkopen = "<a href='$link'>";
747: my $linkclose = "</a>";
748:
749: # Default icon: HTML page
750: my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
751:
752: if ($resource->is_problem()) {
753: if ($part eq "" || $params->{'condensed'}) {
754: $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
755: } else {
756: $icon = $params->{'indentString'};
757: }
758: }
759:
760: # Display the correct map icon to open or shut map
761: if ($resource->is_map()) {
762: my $mapId = $resource->map_pc();
763: my $nowOpen = !defined($filter->{$mapId});
764: if ($it->{CONDITION}) {
765: $nowOpen = !$nowOpen;
766: }
767:
768: if (!$params->{'resource_no_folder_link'}) {
769: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
770: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
771:
772: $linkopen = "<a href='" . $params->{'url'} . '?' .
773: $params->{'queryString'} . '&filter=';
774: $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
775: addToFilter($filter, $mapId) :
776: removeFromFilter($filter, $mapId);
777: $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
778: . $params->{'hereType'} . '&here=' .
779: &Apache::lonnet::escape($params->{'here'}) .
780: '&jump=' .
781: &Apache::lonnet::escape($resource->symb()) .
782: "&folderManip=1'>";
783: } else {
784: # Don't allow users to manipulate folder
785: $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
786: '.nomanip.gif';
787: $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
788:
789: $linkopen = "";
790: $linkclose = "";
791: }
792: }
793:
794: if ($resource->randomout()) {
795: $nonLinkedText .= ' <i>(hidden)</i> ';
796: }
797:
798: # We're done preparing and finally ready to start the rendering
799: my $result = "<td align='left' valign='center'>";
800:
801: my $indentLevel = $params->{'indentLevel'};
802: if ($newBranchText) { $indentLevel--; }
803:
804: # print indentation
805: for (my $i = 0; $i < $indentLevel; $i++) {
806: $result .= $params->{'indentString'};
807: }
808:
809: # Decide what to display
810: $result .= "$newBranchText$linkopen$icon$linkclose";
811:
812: my $curMarkerBegin = '';
813: my $curMarkerEnd = '';
814:
815: # Is this the current resource?
816: if (!$params->{'displayedHereMarker'} &&
817: $resource->symb() eq $params->{'here'} ) {
818: $curMarkerBegin = '<font color="red" size="+2">> </font>';
819: $curMarkerEnd = '<font color="red" size="+2"><</font>';
820: $params->{'displayedHereMarker'} = 1;
821: }
822:
823: if ($resource->is_problem() && $part ne "" &&
824: !$params->{'condensed'}) {
825: $partLabel = " (Part $part)";
826: $title = "";
827: }
828:
829: if ($params->{'condensed'} && $resource->countParts() > 1) {
830: $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
831: }
832:
833: if (!$params->{'resource_nolink'}) {
834: $result .= " $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
835: } else {
836: $result .= " $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
837: }
838:
839: return $result;
840: }
841:
842: sub render_communication_status {
843: my ($resource, $part, $params) = @_;
844: my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
845:
846: my $link = $params->{"resourceLink"};
847: my $linkopen = "<a href='$link'>";
848: my $linkclose = "</a>";
849:
850: if ($resource->hasDiscussion()) {
851: $discussionHTML = $linkopen .
852: '<img border="0" src="/adm/lonMisc/chat.gif" />' .
853: $linkclose;
854: }
855:
856: if ($resource->getFeedback()) {
857: my $feedback = $resource->getFeedback();
858: foreach (split(/\,/, $feedback)) {
859: if ($_) {
860: $feedbackHTML .= ' <a href="/adm/email?display='
861: . &Apache::lonnet::escape($_) . '">'
862: . '<img src="/adm/lonMisc/feedback.gif" '
863: . 'border="0" /></a>';
864: }
865: }
866: }
867:
868: if ($resource->getErrors()) {
869: my $errors = $resource->getErrors();
870: foreach (split(/,/, $errors)) {
871: if ($_) {
872: $errorHTML .= ' <a href="/adm/email?display='
873: . &Apache::lonnet::escape($_) . '">'
874: . '<img src="/adm/lonMisc/bomb.gif" '
875: . 'border="0" /></a>';
876: }
877: }
878: }
879:
880: return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML </td>";
881:
882: }
883: sub render_quick_status {
884: my ($resource, $part, $params) = @_;
885: my $result = "";
886: my $firstDisplayed = !$params->{'condensed'} &&
887: $params->{'multipart'} && $part eq "0";
888:
889: my $link = $params->{"resourceLink"};
890: my $linkopen = "<a href='$link'>";
891: my $linkclose = "</a>";
892:
893: if ($resource->is_problem() &&
894: !$firstDisplayed) {
895: my $icon = $statusIconMap{$resource->status($part)};
896: my $alt = $iconAltTags{$icon};
897: if ($icon) {
898: $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
899: } else {
900: $result .= "<td width='30'> </td>\n";
901: }
902: } else { # not problem, no icon
903: $result .= "<td width='30'> </td>\n";
904: }
905:
906: return $result;
907: }
908: sub render_long_status {
909: my ($resource, $part, $params) = @_;
910: my $result = "<td align='right' valign='center'>\n";
911: my $firstDisplayed = !$params->{'condensed'} &&
912: $params->{'multipart'} && $part eq "0";
913:
914: my $color;
915: if ($resource->is_problem()) {
916: $color = $colormap{$resource->status};
917:
918: if (dueInLessThen24Hours($resource, $part) ||
919: lastTry($resource, $part)) {
920: $color = $hurryUpColor;
921: }
922: }
923:
924: if ($resource->kind() eq "res" &&
925: $resource->is_problem() &&
926: !$firstDisplayed) {
927: if ($color) {$result .= "<font color=\"$color\"><b>"; }
928: $result .= getDescription($resource, $part);
929: if ($color) {$result .= "</b></font>"; }
930: }
931: if ($resource->is_map() && advancedUser() && $resource->randompick()) {
932: $result .= '(randomly select ' . $resource->randompick() .')';
933: }
934:
935: $result .= " </td>\n";
936:
937: return $result;
938: }
939:
940: my @preparedColumns = (\&render_resource, \&render_communication_status,
941: \&render_quick_status, \&render_long_status);
942:
943: sub setDefault {
944: my ($val, $default) = @_;
945: if (!defined($val)) { return $default; }
946: return $val;
947: }
948:
949: sub render {
950: my $args = shift;
951: &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
952: my $result = '';
953:
954: # Configure the renderer.
955: my $cols = $args->{'cols'};
956: if (!defined($cols)) {
957: # no columns, no nav maps.
958: return '';
959: }
960: my $mustCloseNavMap = 0;
961: my $navmap;
962: if (defined($args->{'navmap'})) {
963: $navmap = $args->{'navmap'};
964: }
965:
966: my $r = $args->{'r'};
967: my $queryString = $args->{'queryString'};
968: my $jump = $args->{'jump'};
969: my $here = $args->{'here'};
970: my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
971: my $currentJumpDelta = 2; # change this to change how many resources are displayed
972: # before the current resource when using #current
973:
974: # If we were passed 'here' information, we are not rendering
975: # after a folder manipulation, and we were not passed an
976: # iterator, make sure we open the folders to show the "here"
977: # marker
978: my $filterHash = {};
979: # Figure out what we're not displaying
980: foreach (split(/\,/, $ENV{"form.filter"})) {
981: if ($_) {
982: $filterHash->{$_} = "1";
983: }
984: }
985:
986: my $condition = 0;
987: if ($ENV{'form.condition'}) {
988: $condition = 1;
989: }
990:
991: if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
992: # Step 1: Check to see if we have a navmap
993: if (!defined($navmap)) {
994: $navmap = Apache::lonnavmaps::navmap->new(
995: $ENV{"request.course.fn"}.".db",
996: $ENV{"request.course.fn"}."_parms.db", 1, 1);
997: $mustCloseNavMap = 1;
998: }
999: $navmap->init();
1000:
1001: # Step two: Locate what kind of here marker is necessary
1002: # Determine where the "here" marker is and where the screen jumps to.
1003:
1004: if ($ENV{'form.postsymb'}) {
1005: $here = $jump = $ENV{'form.postsymb'};
1006: } elsif ($ENV{'form.postdata'}) {
1007: # couldn't find a symb, is there a URL?
1008: my $currenturl = $ENV{'form.postdata'};
1009: #$currenturl=~s/^http\:\/\///;
1010: #$currenturl=~s/^[^\/]+//;
1011:
1012: $here = $jump = &Apache::lonnet::symbread($currenturl);
1013: }
1014:
1015: # Step three: Ensure the folders are open
1016: my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
1017: my $depth = 1;
1018: $mapIterator->next(); # discard the first BEGIN_MAP
1019: my $curRes = $mapIterator->next();
1020: my $found = 0;
1021:
1022: # We only need to do this if we need to open the maps to show the
1023: # current position. This will change the counter so we can't count
1024: # for the jump marker with this loop.
1025: while ($depth > 0 && !$found) {
1026: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1027: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1028:
1029: if (ref($curRes) && $curRes->symb() eq $here) {
1030: my $mapStack = $mapIterator->getStack();
1031:
1032: # Ensure the parent maps are open
1033: for my $map (@{$mapStack}) {
1034: if ($condition) {
1035: undef $filterHash->{$map->map_pc()};
1036: } else {
1037: $filterHash->{$map->map_pc()} = 1;
1038: }
1039: }
1040: $found = 1;
1041: }
1042:
1043: $curRes = $mapIterator->next();
1044: }
1045: }
1046:
1047: if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
1048: # If this is a click on a folder or something, we want to preserve the "here"
1049: # from the querystring, and get the new "jump" marker
1050: $here = $ENV{'form.here'};
1051: $jump = $ENV{'form.jump'};
1052: }
1053:
1054: my $it = $args->{'iterator'};
1055: if (!defined($it)) {
1056: # Construct a default iterator based on $ENV{'form.'} information
1057:
1058: # Step 1: Check to see if we have a navmap
1059: if (!defined($navmap)) {
1060: $navmap = Apache::lonnavmaps::navmap->new($r,
1061: $ENV{"request.course.fn"}.".db",
1062: $ENV{"request.course.fn"}."_parms.db", 1, 1);
1063: $mustCloseNavMap = 1;
1064: }
1065: # Paranoia: Make sure it's ready
1066: $navmap->init();
1067:
1068: # See if we're being passed a specific map
1069: if ($args->{'iterator_map'}) {
1070: my $map = $args->{'iterator_map'};
1071: $map = $navmap->getResourceByUrl($map);
1072: my $firstResource = $map->map_start();
1073: my $finishResource = $map->map_finish();
1074:
1075: $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
1076: } else {
1077: $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
1078: }
1079: }
1080:
1081: # (re-)Locate the jump point, if any
1082: my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
1083: my $depth = 1;
1084: $mapIterator->next();
1085: my $curRes = $mapIterator->next();
1086: my $foundJump = 0;
1087: my $counter = 0;
1088:
1089: while ($depth > 0 && !$foundJump) {
1090: if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
1091: if ($curRes == $mapIterator->END_MAP()) { $depth--; }
1092: if (ref($curRes)) { $counter++; }
1093:
1094: if (ref($curRes) && $jump eq $curRes->symb()) {
1095:
1096: # This is why we have to use the main iterator instead of the
1097: # potentially faster DFS: The count has to be the same, so
1098: # the order has to be the same, which DFS won't give us.
1099: $args->{'currentJumpIndex'} = $counter;
1100: $foundJump = 1;
1101: }
1102:
1103: $curRes = $mapIterator->next();
1104: }
1105:
1106: my $showParts = setDefault($args->{'showParts'}, 1);
1107: my $condenseParts = setDefault($args->{'condenseParts'}, 1);
1108: # keeps track of when the current resource is found,
1109: # so we can back up a few and put the anchor above the
1110: # current resource
1111: my $printKey = $args->{'printKey'};
1112: my $printCloseAll = $args->{'printCloseAll'};
1113: if (!defined($printCloseAll)) { $printCloseAll = 1; }
1114: my $filterFunc = setDefault($args->{'filterFunc'},
1115: sub {return 1;});
1116:
1117: # Print key?
1118: if ($printKey) {
1119: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
1120: my $date=localtime;
1121: $result.='<tr><td align="right" valign="bottom">Key: </td>';
1122: if ($navmap->{LAST_CHECK}) {
1123: $result .=
1124: '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
1125: strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
1126: '</td><td align="center" valign="bottom"> '.
1127: '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
1128: '</td>';
1129: } else {
1130: $result .= '<td align="center" valign="bottom"> '.
1131: '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
1132: ' <img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
1133: '</td>';
1134: }
1135:
1136: $result .= '</tr></table>';
1137: }
1138:
1139: if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
1140: if ($condition) {
1141: $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
1142: "&here=" . Apache::lonnet::escape($here) .
1143: "\">Close All Folders</a>";
1144: } else {
1145: $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
1146: "&here=" . Apache::lonnet::escape($here) .
1147: "\">Open All Folders</a>";
1148: }
1149: $result .= "<br /><br />\n";
1150: }
1151:
1152: if ($r) {
1153: $r->print($result);
1154: $r->rflush();
1155: $result = "";
1156: }
1157: # End parameter setting
1158:
1159: # Data
1160: $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
1161: my $res = "Apache::lonnavmaps::resource";
1162: my %condenseStatuses =
1163: ( $res->NETWORK_FAILURE => 1,
1164: $res->NOTHING_SET => 1,
1165: $res->CORRECT => 1 );
1166: my @backgroundColors = ("#FFFFFF", "#F6F6F6");
1167:
1168: # Shared variables
1169: $args->{'counter'} = 0; # counts the rows
1170: $args->{'indentLevel'} = 0;
1171: $args->{'isNewBranch'} = 0;
1172: $args->{'condensed'} = 0;
1173: $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
1174: $args->{'displayedHereMarker'} = 0;
1175:
1176: my $displayedJumpMarker = 0;
1177: # Set up iteration.
1178: $depth = 1;
1179: $it->next(); # discard initial BEGIN_MAP
1180: $curRes = $it->next();
1181: my $now = time();
1182: my $in24Hours = $now + 24 * 60 * 60;
1183: my $rownum = 0;
1184:
1185: # export "here" marker information
1186: $args->{'here'} = $here;
1187:
1188: while ($depth > 0) {
1189: if ($curRes == $it->BEGIN_MAP()) { $depth++; }
1190: if ($curRes == $it->END_MAP()) { $depth--; }
1191:
1192: # Maintain indentation level.
1193: if ($curRes == $it->BEGIN_MAP() ||
1194: $curRes == $it->BEGIN_BRANCH() ) {
1195: $args->{'indentLevel'}++;
1196: }
1197: if ($curRes == $it->END_MAP() ||
1198: $curRes == $it->END_BRANCH() ) {
1199: $args->{'indentLevel'}--;
1200: }
1201: # Notice new branches
1202: if ($curRes == $it->BEGIN_BRANCH()) {
1203: $args->{'isNewBranch'} = 1;
1204: }
1205:
1206: # If this isn't an actual resource, continue on
1207: if (!ref($curRes)) {
1208: next;
1209: }
1210:
1211: $args->{'counter'}++;
1212:
1213: # If this has been filtered out, continue on
1214: if (!(&$filterFunc($curRes))) {
1215: $args->{'isNewBranch'} = 0; # Don't falsely remember this
1216: next;
1217: }
1218:
1219: # If we're suppressing navmaps and this is a navmap, continue on
1220: if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
1221: next;
1222: }
1223:
1224: # Does it have multiple parts?
1225: $args->{'multipart'} = 0;
1226: $args->{'condensed'} = 0;
1227: my @parts;
1228:
1229: # Decide what parts to show.
1230: if ($curRes->is_problem() && $showParts) {
1231: @parts = @{$curRes->parts()};
1232: $args->{'multipart'} = scalar(@parts) > 1;
1233:
1234: if ($condenseParts) { # do the condensation
1235: if (!$curRes->opendate("0")) {
1236: @parts = ();
1237: $args->{'condensed'} = 1;
1238: }
1239: if (!$args->{'condensed'}) {
1240: # Decide whether to condense based on similarity
1241: my $status = $curRes->status($parts[1]);
1242: my $due = $curRes->duedate($parts[1]);
1243: my $open = $curRes->opendate($parts[1]);
1244: my $statusAllSame = 1;
1245: my $dueAllSame = 1;
1246: my $openAllSame = 1;
1247: for (my $i = 2; $i < scalar(@parts); $i++) {
1248: if ($curRes->status($parts[$i]) != $status){
1249: $statusAllSame = 0;
1250: }
1251: if ($curRes->duedate($parts[$i]) != $due ) {
1252: $dueAllSame = 0;
1253: }
1254: if ($curRes->opendate($parts[$i]) != $open) {
1255: $openAllSame = 0;
1256: }
1257: }
1258: # $*allSame is true if all the statuses were
1259: # the same. Now, if they are all the same and
1260: # match one of the statuses to condense, or they
1261: # are all open with the same due date, or they are
1262: # all OPEN_LATER with the same open date, display the
1263: # status of the first non-zero part (to get the 'correct'
1264: # status right, since 0 is never 'correct' or 'open').
1265: if (($statusAllSame && defined($condenseStatuses{$status})) ||
1266: ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
1267: ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
1268: @parts = ();
1269: $args->{'condensed'} = 1;
1270: }
1271:
1272: }
1273: }
1274: }
1275:
1276: # If the multipart problem was condensed, "forget" it was multipart
1277: if (scalar(@parts) == 1) {
1278: $args->{'multipart'} = 0;
1279: }
1280:
1281: # Now, we've decided what parts to show. Loop through them and
1282: # show them.
1283: foreach my $part ('', @parts) {
1284: if ($part eq '0') {
1285: next;
1286: }
1287: $rownum ++;
1288: my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
1289:
1290: $result .= " <tr bgcolor='$backgroundColor'>\n";
1291:
1292: # Set up some data about the parts that the cols might want
1293: my $filter = $it->{FILTER};
1294: my $stack = $it->getStack();
1295: my $src = getLinkForResource($stack);
1296:
1297: my $srcHasQuestion = $src =~ /\?/;
1298: $args->{"resourceLink"} = $src.
1299: ($srcHasQuestion?'&':'?') .
1300: 'symb=' . &Apache::lonnet::escape($curRes->symb());
1301:
1302: # Now, display each column.
1303: foreach my $col (@$cols) {
1304: my $colHTML = '';
1305: if (ref($col)) {
1306: $colHTML .= &$col($curRes, $part, $args);
1307: } else {
1308: $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
1309: }
1310:
1311: # If this is the first column and it's time to print
1312: # the anchor, do so
1313: if ($col == $cols->[0] &&
1314: $args->{'counter'} == $args->{'currentJumpIndex'} -
1315: $currentJumpDelta) {
1316: # Jam the anchor after the <td> tag;
1317: # necessary for valid HTML (which Mozilla requires)
1318: $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
1319: $displayedJumpMarker = 1;
1320: }
1321: $result .= $colHTML . "\n";
1322: }
1323: $result .= " </tr>\n";
1324: $args->{'isNewBranch'} = 0;
1325: }
1326:
1327: if ($r && $rownum % 20 == 0) {
1328: $r->print($result);
1329: $result = "";
1330: $r->rflush();
1331: }
1332: } continue {
1333: $curRes = $it->next();
1334: }
1335:
1336: # Print out the part that jumps to #curloc if it exists
1337: # delay needed because the browser is processing the jump before
1338: # it finishes rendering, so it goes to the wrong place!
1339: # onload might be better, but this routine has no access to that.
1340: # On mozilla, the 0-millisecond timeout seems to prevent this;
1341: # it's quite likely this might fix other browsers, too, and
1342: # certainly won't hurt anything.
1343: if ($displayedJumpMarker) {
1344: $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
1345: }
1346:
1347: $result .= "</table>";
1348:
1349: if ($r) {
1350: $r->print($result);
1351: $result = "";
1352: $r->rflush();
1353: }
1354:
1355: if ($mustCloseNavMap) { $navmap->untieHashes(); }
1356:
1357: return $result;
1358: }
1359:
1360: 1;
1361:
1362: package Apache::lonnavmaps::navmap;
1363:
1364: =pod
1365:
1366: lonnavmaps provides functions and objects for dealing with the
1367: compiled course hashes generated when a user enters the course, the
1368: Apache handler for the "Navigation Map" button, and a flexible
1369: prepared renderer for navigation maps that are easy to use anywhere.
1370:
1371: =head1 Object: navmap
1372:
1373: Encapsulating the compiled nav map
1374:
1375: navmap is an object that encapsulates a compiled course map and
1376: provides a reasonable interface to it.
1377:
1378: Most notably it provides a way to navigate the map sensibly and a
1379: flexible iterator that makes it easy to write various renderers based
1380: on nav maps.
1381:
1382: You must obtain resource objects through the navmap object.
1383:
1384: =head2 Methods
1385:
1386: =over 4
1387:
1388: =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
1389: genMailDiscussStatus):
1390:
1391: Binds a new navmap object to the compiled nav map hash and parm hash
1392: given as filenames. genCourseAndUserOptions is a flag saying whether
1393: the course options and user options hash should be generated. This is
1394: for when you are using the parameters of the resources that require
1395: them; see documentation in resource object
1396: documentation. genMailDiscussStatus causes the nav map to retreive
1397: information about the email and discussion status of
1398: resources. Returns the navmap object if this is successful, or
1399: B<undef> if not. You must check for undef; errors will occur when you
1400: try to use the other methods otherwise.
1401:
1402: =item * B<getIterator>(first, finish, filter, condition):
1403:
1404: See iterator documentation below.
1405:
1406: =cut
1407:
1408: use strict;
1409: use GDBM_File;
1410:
1411: sub new {
1412: # magic invocation to create a class instance
1413: my $proto = shift;
1414: my $class = ref($proto) || $proto;
1415: my $self = {};
1416:
1417: $self->{NAV_HASH_FILE} = shift;
1418: $self->{PARM_HASH_FILE} = shift;
1419: $self->{GENERATE_COURSE_USER_OPT} = shift;
1420: $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1421:
1422: # Resource cache stores navmap resources as we reference them. We generate
1423: # them on-demand so we don't pay for creating resources unless we use them.
1424: $self->{RESOURCE_CACHE} = {};
1425:
1426: # Network failure flag, if we accessed the course or user opt and
1427: # failed
1428: $self->{NETWORK_FAILURE} = 0;
1429:
1430: # tie the nav hash
1431:
1432: my %navmaphash;
1433: my %parmhash;
1434: if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
1435: &GDBM_READER(), 0640))) {
1436: return undef;
1437: }
1438:
1439: if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
1440: &GDBM_READER(), 0640)))
1441: {
1442: untie %{$self->{PARM_HASH}};
1443: return undef;
1444: }
1445:
1446: $self->{NAV_HASH} = \%navmaphash;
1447: $self->{PARM_HASH} = \%parmhash;
1448: $self->{INITED} = 0;
1449:
1450: bless($self);
1451:
1452: return $self;
1453: }
1454:
1455: sub init {
1456: my $self = shift;
1457: if ($self->{INITED}) { return; }
1458:
1459: # If the course opt hash and the user opt hash should be generated,
1460: # generate them
1461: if ($self->{GENERATE_COURSE_USER_OPT}) {
1462: my $uname=$ENV{'user.name'};
1463: my $udom=$ENV{'user.domain'};
1464: my $uhome=$ENV{'user.home'};
1465: my $cid=$ENV{'request.course.id'};
1466: my $chome=$ENV{'course.'.$cid.'.home'};
1467: my ($cdom,$cnum)=split(/\_/,$cid);
1468:
1469: my $userprefix=$uname.'_'.$udom.'_';
1470:
1471: my %courserdatas; my %useropt; my %courseopt; my %userrdatas;
1472: unless ($uhome eq 'no_host') {
1473: # ------------------------------------------------- Get coursedata (if present)
1474: unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
1475: my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
1476: ':resourcedata',$chome);
1477: # Check for network failure
1478: if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
1479: $self->{NETWORK_FAILURE} = 1;
1480: } elsif ($reply!~/^error\:/) {
1481: $courserdatas{$cid}=$reply;
1482: $courserdatas{$cid.'.last_cache'}=time;
1483: }
1484: }
1485: foreach (split(/\&/,$courserdatas{$cid})) {
1486: my ($name,$value)=split(/\=/,$_);
1487: $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
1488: &Apache::lonnet::unescape($value);
1489: }
1490: # --------------------------------------------------- Get userdata (if present)
1491: unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
1492: my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
1493: if ($reply!~/^error\:/) {
1494: $userrdatas{$uname.'___'.$udom}=$reply;
1495: $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
1496: }
1497: # check to see if network failed
1498: elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
1499: {
1500: $self->{NETWORK_FAILURE} = 1;
1501: }
1502: }
1503: foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
1504: my ($name,$value)=split(/\=/,$_);
1505: $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
1506: &Apache::lonnet::unescape($value);
1507: }
1508: $self->{COURSE_OPT} = \%courseopt;
1509: $self->{USER_OPT} = \%useropt;
1510: }
1511: }
1512:
1513: if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
1514: my $cid=$ENV{'request.course.id'};
1515: my ($cdom,$cnum)=split(/\_/,$cid);
1516:
1517: my %emailstatus = &Apache::lonnet::dump('email_status');
1518: my $logoutTime = $emailstatus{'logout'};
1519: my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1520: $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
1521: $courseLeaveTime : $logoutTime);
1522: my %discussiontime = &Apache::lonnet::dump('discussiontimes',
1523: $cdom, $cnum);
1524: my %feedback=();
1525: my %error=();
1526: my $keys = &Apache::lonnet::reply('keys:'.
1527: $ENV{'user.domain'}.':'.
1528: $ENV{'user.name'}.':nohist_email',
1529: $ENV{'user.home'});
1530:
1531: foreach my $msgid (split(/\&/, $keys)) {
1532: $msgid=&Apache::lonnet::unescape($msgid);
1533: my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
1534: if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
1535: my ($what,$url)=($1,$2);
1536: my %status=
1537: &Apache::lonnet::get('email_status',[$msgid]);
1538: if ($status{$msgid}=~/^error\:/) {
1539: $status{$msgid}='';
1540: }
1541:
1542: if (($status{$msgid} eq 'new') ||
1543: (!$status{$msgid})) {
1544: if ($what eq 'Error') {
1545: $error{$url}.=','.$msgid;
1546: } else {
1547: $feedback{$url}.=','.$msgid;
1548: }
1549: }
1550: }
1551: }
1552:
1553: $self->{FEEDBACK} = \%feedback;
1554: $self->{ERROR_MSG} = \%error; # what is this? JB
1555: $self->{DISCUSSION_TIME} = \%discussiontime;
1556: $self->{EMAIL_STATUS} = \%emailstatus;
1557:
1558: }
1559:
1560: $self->{PARM_CACHE} = {};
1561: $self->{INITED} = 1;
1562: }
1563:
1564: # Internal function: Takes a key to look up in the nav hash and implements internal
1565: # memory caching of that key.
1566: sub navhash {
1567: my $self = shift; my $key = shift;
1568: return $self->{NAV_HASH}->{$key};
1569: }
1570:
1571: # Checks to see if coursemap is defined, matching test in old lonnavmaps
1572: sub courseMapDefined {
1573: my $self = shift;
1574: my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
1575:
1576: my $firstres = $self->navhash("map_start_$uri");
1577: my $lastres = $self->navhash("map_finish_$uri");
1578: return $firstres && $lastres;
1579: }
1580:
1581: sub getIterator {
1582: my $self = shift;
1583: my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
1584: shift, undef, shift);
1585: return $iterator;
1586: }
1587:
1588: # unties the hash when done
1589: sub untieHashes {
1590: my $self = shift;
1591: untie %{$self->{NAV_HASH}};
1592: untie %{$self->{PARM_HASH}};
1593: }
1594:
1595: # Private method: Does the given resource (as a symb string) have
1596: # current discussion? Returns 0 if chat/mail data not extracted.
1597: sub hasDiscussion {
1598: my $self = shift;
1599: my $symb = shift;
1600: if (!defined($self->{DISCUSSION_TIME})) { return 0; }
1601:
1602: #return defined($self->{DISCUSSION_TIME}->{$symb});
1603: return $self->{DISCUSSION_TIME}->{$symb} >
1604: $self->{LAST_CHECK};
1605: }
1606:
1607: # Private method: Does the given resource (as a symb string) have
1608: # current feedback? Returns the string in the feedback hash, which
1609: # will be false if it does not exist.
1610: sub getFeedback {
1611: my $self = shift;
1612: my $symb = shift;
1613:
1614: if (!defined($self->{FEEDBACK})) { return ""; }
1615:
1616: return $self->{FEEDBACK}->{$symb};
1617: }
1618:
1619: # Private method: Get the errors for that resource (by source).
1620: sub getErrors {
1621: my $self = shift;
1622: my $src = shift;
1623:
1624: if (!defined($self->{ERROR_MSG})) { return ""; }
1625: return $self->{ERROR_MSG}->{$src};
1626: }
1627:
1628: =pod
1629:
1630: =item * B<getById>(id):
1631:
1632: Based on the ID of the resource (1.1, 3.2, etc.), get a resource
1633: object for that resource. This method, or other methods that use it
1634: (as in the resource object) is the only proper way to obtain a
1635: resource object.
1636:
1637: =cut
1638:
1639: # The strategy here is to cache the resource objects, and only construct them
1640: # as we use them. The real point is to prevent reading any more from the tied
1641: # hash then we have to, which should hopefully alleviate speed problems.
1642: # Caching is just an incidental detail I throw in because it makes sense.
1643:
1644: sub getById {
1645: my $self = shift;
1646: my $id = shift;
1647:
1648: if (defined ($self->{RESOURCE_CACHE}->{$id}))
1649: {
1650: return $self->{RESOURCE_CACHE}->{$id};
1651: }
1652:
1653: # resource handles inserting itself into cache.
1654: # Not clear why the quotes are necessary, but as of this
1655: # writing it doesn't work without them.
1656: return "Apache::lonnavmaps::resource"->new($self, $id);
1657: }
1658:
1659: sub getBySymb {
1660: my $self = shift;
1661: my $symb = shift;
1662: my ($mapUrl, $id, $filename) = split (/___/, $symb);
1663: my $map = $self->getResourceByUrl($mapUrl);
1664: return $self->getById($map->map_pc() . '.' . $id);
1665: }
1666:
1667: =pod
1668:
1669: =item * B<firstResource>():
1670:
1671: Returns a resource object reference corresponding to the first
1672: resource in the navmap.
1673:
1674: =cut
1675:
1676: sub firstResource {
1677: my $self = shift;
1678: my $firstResource = $self->navhash('map_start_' .
1679: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1680: return $self->getById($firstResource);
1681: }
1682:
1683: =pod
1684:
1685: =item * B<finishResource>():
1686:
1687: Returns a resource object reference corresponding to the last resource
1688: in the navmap.
1689:
1690: =cut
1691:
1692: sub finishResource {
1693: my $self = shift;
1694: my $firstResource = $self->navhash('map_finish_' .
1695: &Apache::lonnet::clutter($ENV{'request.course.uri'}));
1696: return $self->getById($firstResource);
1697: }
1698:
1699: # Parmval reads the parm hash and cascades the lookups. parmval_real does
1700: # the actual lookup; parmval caches the results.
1701: sub parmval {
1702: my $self = shift;
1703: my ($what,$symb)=@_;
1704: my $hashkey = $what."|||".$symb;
1705:
1706: if (defined($self->{PARM_CACHE}->{$hashkey})) {
1707: return $self->{PARM_CACHE}->{$hashkey};
1708: }
1709:
1710: my $result = $self->parmval_real($what, $symb);
1711: $self->{PARM_CACHE}->{$hashkey} = $result;
1712: return $result;
1713: }
1714:
1715: sub parmval_real {
1716: my $self = shift;
1717: my ($what,$symb) = @_;
1718:
1719: my $cid=$ENV{'request.course.id'};
1720: my $csec=$ENV{'request.course.sec'};
1721: my $uname=$ENV{'user.name'};
1722: my $udom=$ENV{'user.domain'};
1723:
1724: unless ($symb) { return ''; }
1725: my $result='';
1726:
1727: my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
1728:
1729: # ----------------------------------------------------- Cascading lookup scheme
1730: my $rwhat=$what;
1731: $what=~s/^parameter\_//;
1732: $what=~s/\_/\./;
1733:
1734: my $symbparm=$symb.'.'.$what;
1735: my $mapparm=$mapname.'___(all).'.$what;
1736: my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
1737:
1738: my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
1739: my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
1740: my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
1741:
1742: my $courselevel= $usercourseprefix.'.'.$what;
1743: my $courselevelr=$usercourseprefix.'.'.$symbparm;
1744: my $courselevelm=$usercourseprefix.'.'.$mapparm;
1745:
1746: my $useropt = $self->{USER_OPT};
1747: my $courseopt = $self->{COURSE_OPT};
1748: my $parmhash = $self->{PARM_HASH};
1749:
1750: # ---------------------------------------------------------- first, check user
1751: if ($uname and defined($useropt)) {
1752: if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
1753: if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
1754: if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1755: }
1756:
1757: # ------------------------------------------------------- second, check course
1758: if ($csec and defined($courseopt)) {
1759: if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
1760: if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
1761: if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1762: }
1763:
1764: if (defined($courseopt)) {
1765: if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
1766: if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
1767: if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1768: }
1769:
1770: # ----------------------------------------------------- third, check map parms
1771:
1772: my $thisparm=$$parmhash{$symbparm};
1773: if (defined($thisparm)) { return $thisparm; }
1774:
1775: # ----------------------------------------------------- fourth , check default
1776:
1777: my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1778: if (defined($default)) { return $default}
1779:
1780: # --------------------------------------------------- fifth , cascade up parts
1781:
1782: my ($space,@qualifier)=split(/\./,$rwhat);
1783: my $qualifier=join('.',@qualifier);
1784: unless ($space eq '0') {
1785: my @parts=split(/_/,$space);
1786: my $id=pop(@parts);
1787: my $part=join('_',@parts);
1788: if ($part eq '') { $part='0'; }
1789: my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1790: if (defined($partgeneral)) { return $partgeneral; }
1791: }
1792: return '';
1793: }
1794:
1795: =pod
1796:
1797: =item * B<getResourceByUrl>(url):
1798:
1799: Retrieves a resource object by URL of the resource. If passed a
1800: resource object, it will simply return it, so it is safe to use this
1801: method in code like "$res = $navmap->getResourceByUrl($res)", if
1802: you're not sure if $res is already an object, or just a URL. If the
1803: resource appears multiple times in the course, only the first instance
1804: will be returned. As a result, this is probably useful only for maps.
1805:
1806: =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
1807:
1808: The map is a specification of a map to retreive the resources from,
1809: either as a url or as an object. The filterFunc is a reference to a
1810: function that takes a resource object as its one argument and returns
1811: true if the resource should be included, or false if it should not
1812: be. If recursive is true, the map will be recursively examined,
1813: otherwise it will not be. If bailout is true, the function will return
1814: as soon as it finds a resource, if false it will finish. By default,
1815: the map is the top-level map of the course, filterFunc is a function
1816: that always returns 1, recursive is true, bailout is false. The
1817: resources will be returned in a list containing the resource objects
1818: for the corresponding resources, with B<no structure information> in
1819: the list; regardless of branching, recursion, etc., it will be a flat
1820: list.
1821:
1822: Thus, this is suitable for cases where you don't want the structure,
1823: just a list of all resources. It is also suitable for finding out how
1824: many resources match a given description; for this use, if all you
1825: want to know is if I<any> resources match the description, the bailout
1826: parameter will allow you to avoid potentially expensive enumeration of
1827: all matching resources.
1828:
1829: =item * B<hasResources>(map, filterFunc, recursive):
1830:
1831: Convience method for
1832:
1833: scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
1834:
1835: which will tell whether the map has resources matching the description
1836: in the filter function.
1837:
1838: =cut
1839:
1840: sub getResourceByUrl {
1841: my $self = shift;
1842: my $resUrl = shift;
1843:
1844: if (ref($resUrl)) { return $resUrl; }
1845:
1846: $resUrl = &Apache::lonnet::clutter($resUrl);
1847: my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
1848: if ($resId =~ /,/) {
1849: $resId = (split (/,/, $resId))[0];
1850: }
1851: if (!$resId) { return ''; }
1852: return $self->getById($resId);
1853: }
1854:
1855: sub retrieveResources {
1856: my $self = shift;
1857: my $map = shift;
1858: my $filterFunc = shift;
1859: if (!defined ($filterFunc)) {
1860: $filterFunc = sub {return 1;};
1861: }
1862: my $recursive = shift;
1863: if (!defined($recursive)) { $recursive = 1; }
1864: my $bailout = shift;
1865: if (!defined($bailout)) { $bailout = 0; }
1866:
1867: # Create the necessary iterator.
1868: if (!ref($map)) { # assume it's a url of a map.
1869: $map = $self->getResourceByUrl($map);
1870: }
1871:
1872: # Check the map's validity.
1873: if (!$map || !$map->is_map()) {
1874: # Oh, to throw an exception.... how I'd love that!
1875: return ();
1876: }
1877:
1878: # Get an iterator.
1879: my $it = $self->getIterator($map->map_start(), $map->map_finish(),
1880: !$recursive);
1881:
1882: my @resources = ();
1883:
1884: # Run down the iterator and collect the resources.
1885: my $depth = 1;
1886: $it->next();
1887: my $curRes = $it->next();
1888:
1889: while ($depth > 0) {
1890: if ($curRes == $it->BEGIN_MAP()) {
1891: $depth++;
1892: }
1893: if ($curRes == $it->END_MAP()) {
1894: $depth--;
1895: }
1896:
1897: if (ref($curRes)) {
1898: if (!&$filterFunc($curRes)) {
1899: next;
1900: }
1901:
1902: push @resources, $curRes;
1903:
1904: if ($bailout) {
1905: return @resources;
1906: }
1907: }
1908:
1909: $curRes = $it->next();
1910: }
1911:
1912: return @resources;
1913: }
1914:
1915: sub hasResource {
1916: my $self = shift;
1917: my $map = shift;
1918: my $filterFunc = shift;
1919: my $recursive = shift;
1920:
1921: return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
1922: }
1923:
1924: 1;
1925:
1926: package Apache::lonnavmaps::iterator;
1927:
1928: =pod
1929:
1930: =back
1931:
1932: =head1 Object: navmap Iterator
1933:
1934: An I<iterator> encapsulates the logic required to traverse a data
1935: structure. navmap uses an iterator to traverse the course map
1936: according to the criteria you wish to use.
1937:
1938: To obtain an iterator, call the B<getIterator>() function of a
1939: B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator
1940: directly.) This will return a reference to the iterator:
1941:
1942: C<my $resourceIterator = $navmap-E<gt>getIterator();>
1943:
1944: To get the next thing from the iterator, call B<next>:
1945:
1946: C<my $nextThing = $resourceIterator-E<gt>next()>
1947:
1948: getIterator behaves as follows:
1949:
1950: =over 4
1951:
1952: =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
1953:
1954: All parameters are optional. firstResource is a resource reference
1955: corresponding to where the iterator should start. It defaults to
1956: navmap->firstResource() for the corresponding nav map. finishResource
1957: corresponds to where you want the iterator to end, defaulting to
1958: navmap->finishResource(). filterHash is a hash used as a set
1959: containing strings representing the resource IDs, defaulting to
1960: empty. Condition is a 1 or 0 that sets what to do with the filter
1961: hash: If a 0, then only resource that exist IN the filterHash will be
1962: recursed on. If it is a 1, only resources NOT in the filterHash will
1963: be recursed on. Defaults to 0. forceTop is a boolean value. If it is
1964: false (default), the iterator will only return the first level of map
1965: that is not just a single, 'redirecting' map. If true, the iterator
1966: will return all information, starting with the top-level map,
1967: regardless of content. returnTopMap, if true (default false), will
1968: cause the iterator to return the top-level map object (resource 0.0)
1969: before anything else.
1970:
1971: Thus, by default, only top-level resources will be shown. Change the
1972: condition to a 1 without changing the hash, and all resources will be
1973: shown. Changing the condition to 1 and including some values in the
1974: hash will allow you to selectively suppress parts of the navmap, while
1975: leaving it on 0 and adding things to the hash will allow you to
1976: selectively add parts of the nav map. See the handler code for
1977: examples.
1978:
1979: The iterator will return either a reference to a resource object, or a
1980: token representing something in the map, such as the beginning of a
1981: new branch. The possible tokens are:
1982:
1983: =over 4
1984:
1985: =item * BEGIN_MAP:
1986:
1987: A new map is being recursed into. This is returned I<after> the map
1988: resource itself is returned.
1989:
1990: =item * END_MAP:
1991:
1992: The map is now done.
1993:
1994: =item * BEGIN_BRANCH:
1995:
1996: A branch is now starting. The next resource returned will be the first
1997: in that branch.
1998:
1999: =item * END_BRANCH:
2000:
2001: The branch is now done.
2002:
2003: =back
2004:
2005: The tokens are retreivable via methods on the iterator object, i.e.,
2006: $iterator->END_MAP.
2007:
2008: Maps can contain empty resources. The iterator will automatically skip
2009: over such resources, but will still treat the structure
2010: correctly. Thus, a complicated map with several branches, but
2011: consisting entirely of empty resources except for one beginning or
2012: ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
2013: but only one resource will be returned.
2014:
2015: =back
2016:
2017: =cut
2018:
2019: # Here are the tokens for the iterator:
2020:
2021: sub BEGIN_MAP { return 1; } # begining of a new map
2022: sub END_MAP { return 2; } # end of the map
2023: sub BEGIN_BRANCH { return 3; } # beginning of a branch
2024: sub END_BRANCH { return 4; } # end of a branch
2025: sub FORWARD { return 1; } # go forward
2026: sub BACKWARD { return 2; }
2027:
2028: sub min {
2029: (my $a, my $b) = @_;
2030: if ($a < $b) { return $a; } else { return $b; }
2031: }
2032:
2033: # In the CVS repository, documentation of this algorithm is included
2034: # in /doc/lonnavdocs, as a PDF and .tex source. Markers like **1**
2035: # will reference the same location in the text as the part of the
2036: # algorithm is running through.
2037:
2038: sub new {
2039: # magic invocation to create a class instance
2040: my $proto = shift;
2041: my $class = ref($proto) || $proto;
2042: my $self = {};
2043:
2044: $self->{NAV_MAP} = shift;
2045: return undef unless ($self->{NAV_MAP});
2046:
2047: # Handle the parameters
2048: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2049: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2050:
2051: # If the given resources are just the ID of the resource, get the
2052: # objects
2053: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2054: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2055: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2056: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2057:
2058: $self->{FILTER} = shift;
2059:
2060: # A hash, used as a set, of resource already seen
2061: $self->{ALREADY_SEEN} = shift;
2062: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2063: $self->{CONDITION} = shift;
2064:
2065: # Do we want to automatically follow "redirection" maps?
2066: $self->{FORCE_TOP} = shift;
2067:
2068: # Do we want to return the top-level map object (resource 0.0)?
2069: $self->{RETURN_0} = shift;
2070: # have we done that yet?
2071: $self->{HAVE_RETURNED_0} = 0;
2072:
2073: # Now, we need to pre-process the map, by walking forward and backward
2074: # over the parts of the map we're going to look at.
2075:
2076: # The processing steps are exactly the same, except for a few small
2077: # changes, so I bundle those up in the following list of two elements:
2078: # (direction_to_iterate, VAL_name, next_resource_method_to_call,
2079: # first_resource).
2080: # This prevents writing nearly-identical code twice.
2081: my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext',
2082: 'FIRST_RESOURCE'],
2083: [BACKWARD(), 'BOT_UP_VAL', 'getPrevious',
2084: 'FINISH_RESOURCE'] );
2085:
2086: my $maxDepth = 0; # tracks max depth
2087:
2088: # If there is only one resource in this map, and it's a map, we
2089: # want to remember that, so the user can ask for the first map
2090: # that isn't just a redirector.
2091: my $resource; my $resourceCount = 0;
2092:
2093: # **1**
2094:
2095: foreach my $pass (@iterations) {
2096: my $direction = $pass->[0];
2097: my $valName = $pass->[1];
2098: my $nextResourceMethod = $pass->[2];
2099: my $firstResourceName = $pass->[3];
2100:
2101: my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP},
2102: $self->{FIRST_RESOURCE},
2103: $self->{FINISH_RESOURCE},
2104: {}, undef, 0, $direction);
2105:
2106: # prime the recursion
2107: $self->{$firstResourceName}->{DATA}->{$valName} = 0;
2108: my $depth = 0;
2109: $iterator->next();
2110: my $curRes = $iterator->next();
2111: while ($depth > -1) {
2112: if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
2113: if ($curRes == $iterator->END_MAP()) { $depth--; }
2114:
2115: if (ref($curRes)) {
2116: # If there's only one resource, this will save it
2117: # we have to filter empty resources from consideration here,
2118: # or even "empty", redirecting maps have two (start & finish)
2119: # or three (start, finish, plus redirector)
2120: if($direction == FORWARD && $curRes->src()) {
2121: $resource = $curRes; $resourceCount++;
2122: }
2123: my $resultingVal = $curRes->{DATA}->{$valName};
2124: my $nextResources = $curRes->$nextResourceMethod();
2125: my $nextCount = scalar(@{$nextResources});
2126:
2127: if ($nextCount == 1) { # **3**
2128: my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
2129: $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
2130: }
2131:
2132: if ($nextCount > 1) { # **4**
2133: foreach my $res (@{$nextResources}) {
2134: my $current = $res->{DATA}->{$valName} || 999999999;
2135: $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
2136: }
2137: }
2138: }
2139:
2140: # Assign the final val (**2**)
2141: if (ref($curRes) && $direction == BACKWARD()) {
2142: my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
2143: $curRes->{DATA}->{BOT_UP_VAL});
2144:
2145: $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth;
2146: if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;}
2147: }
2148: $curRes = $iterator->next();
2149: }
2150: }
2151:
2152: # Check: Was this only one resource, a map?
2153: if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) {
2154: my $firstResource = $resource->map_start();
2155: my $finishResource = $resource->map_finish();
2156: return
2157: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2158: $finishResource, $self->{FILTER},
2159: $self->{ALREADY_SEEN},
2160: $self->{CONDITION}, 0);
2161:
2162: }
2163:
2164: # Set up some bookkeeping information.
2165: $self->{CURRENT_DEPTH} = 0;
2166: $self->{MAX_DEPTH} = $maxDepth;
2167: $self->{STACK} = [];
2168: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2169:
2170: for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) {
2171: push @{$self->{STACK}}, [];
2172: }
2173:
2174: # Prime the recursion w/ the first resource **5**
2175: push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
2176: $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;
2177:
2178: bless ($self);
2179:
2180: return $self;
2181: }
2182:
2183: sub next {
2184: my $self = shift;
2185:
2186: # If we want to return the top-level map object, and haven't yet,
2187: # do so.
2188: if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
2189: $self->{HAVE_RETURNED_0} = 1;
2190: return $self->{NAV_MAP}->getById('0.0');
2191: }
2192:
2193: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2194: # grab the next from the recursive iterator
2195: my $next = $self->{RECURSIVE_ITERATOR}->next();
2196:
2197: # is it a begin or end map? If so, update the depth
2198: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2199: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2200:
2201: # Are we back at depth 0? If so, stop recursing
2202: if ($self->{RECURSIVE_DEPTH} == 0) {
2203: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2204: }
2205:
2206: return $next;
2207: }
2208:
2209: if (defined($self->{FORCE_NEXT})) {
2210: my $tmp = $self->{FORCE_NEXT};
2211: $self->{FORCE_NEXT} = undef;
2212: return $tmp;
2213: }
2214:
2215: # Have we not yet begun? If not, return BEGIN_MAP and
2216: # remember we've started.
2217: if ( !$self->{STARTED} ) {
2218: $self->{STARTED} = 1;
2219: return $self->BEGIN_MAP();
2220: }
2221:
2222: # Here's the guts of the iterator.
2223:
2224: # Find the next resource, if any.
2225: my $found = 0;
2226: my $i = $self->{MAX_DEPTH};
2227: my $newDepth;
2228: my $here;
2229: while ( $i >= 0 && !$found ) {
2230: if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # **6**
2231: $here = pop @{$self->{STACK}->[$i]}; # **7**
2232: $found = 1;
2233: $newDepth = $i;
2234: }
2235: $i--;
2236: }
2237:
2238: # If we still didn't find anything, we're done.
2239: if ( !$found ) {
2240: # We need to get back down to the correct branch depth
2241: if ( $self->{CURRENT_DEPTH} > 0 ) {
2242: $self->{CURRENT_DEPTH}--;
2243: return END_BRANCH();
2244: } else {
2245: return END_MAP();
2246: }
2247: }
2248:
2249: # If this is not a resource, it must be an END_BRANCH marker we want
2250: # to return directly.
2251: if (!ref($here)) { # **8**
2252: if ($here == END_BRANCH()) { # paranoia, in case of later extension
2253: $self->{CURRENT_DEPTH}--;
2254: return $here;
2255: }
2256: }
2257:
2258: # Otherwise, it is a resource and it's safe to store in $self->{HERE}
2259: $self->{HERE} = $here;
2260:
2261: # Get to the right level
2262: if ( $self->{CURRENT_DEPTH} > $newDepth ) {
2263: push @{$self->{STACK}->[$newDepth]}, $here;
2264: $self->{CURRENT_DEPTH}--;
2265: return END_BRANCH();
2266: }
2267: if ( $self->{CURRENT_DEPTH} < $newDepth) {
2268: push @{$self->{STACK}->[$newDepth]}, $here;
2269: $self->{CURRENT_DEPTH}++;
2270: return BEGIN_BRANCH();
2271: }
2272:
2273: # If we made it here, we have the next resource, and we're at the
2274: # right branch level. So let's examine the resource for where
2275: # we can get to from here.
2276:
2277: # So we need to look at all the resources we can get to from here,
2278: # categorize them if we haven't seen them, remember if we have a new
2279: my $nextUnfiltered = $here->getNext();
2280: my $maxDepthAdded = -1;
2281:
2282: for (@$nextUnfiltered) {
2283: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2284: my $depth = $_->{DATA}->{DISPLAY_DEPTH};
2285: push @{$self->{STACK}->[$depth]}, $_;
2286: $self->{ALREADY_SEEN}->{$_->{ID}} = 1;
2287: if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
2288: }
2289: }
2290:
2291: # Is this the end of a branch? If so, all of the resources examined above
2292: # led to lower levels then the one we are currently at, so we push a END_BRANCH
2293: # marker onto the stack so we don't forget.
2294: # Example: For the usual A(BC)(DE)F case, when the iterator goes down the
2295: # BC branch and gets to C, it will see F as the only next resource, but it's
2296: # one level lower. Thus, this is the end of the branch, since there are no
2297: # more resources added to this level or above.
2298: # We don't do this if the examined resource is the finish resource,
2299: # because the condition given above is true, but the "END_MAP" will
2300: # take care of things and we should already be at depth 0.
2301: my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
2302: if ($isEndOfBranch && $here != $self->{FINISH_RESOURCE}) { # **9**
2303: push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
2304: }
2305:
2306: # That ends the main iterator logic. Now, do we want to recurse
2307: # down this map (if this resource is a map)?
2308: if ($self->{HERE}->is_map() &&
2309: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2310: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2311: my $firstResource = $self->{HERE}->map_start();
2312: my $finishResource = $self->{HERE}->map_finish();
2313:
2314: $self->{RECURSIVE_ITERATOR} =
2315: Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
2316: $finishResource, $self->{FILTER},
2317: $self->{ALREADY_SEEN}, $self->{CONDITION});
2318: }
2319:
2320: # If this is a blank resource, don't actually return it.
2321: # Should you ever find you need it, make sure to add an option to the code
2322: # that you can use; other things depend on this behavior.
2323: my $browsePriv = $self->{HERE}->browsePriv();
2324: if (!$self->{HERE}->src() ||
2325: (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
2326: return $self->next();
2327: }
2328:
2329: return $self->{HERE};
2330:
2331: }
2332:
2333: =pod
2334:
2335: The other method available on the iterator is B<getStack>, which
2336: returns an array populated with the current 'stack' of maps, as
2337: references to the resource objects. Example: This is useful when
2338: making the navigation map, as we need to check whether we are under a
2339: page map to see if we need to link directly to the resource, or to the
2340: page. The first elements in the array will correspond to the top of
2341: the stack (most inclusive map).
2342:
2343: =cut
2344:
2345: sub getStack {
2346: my $self=shift;
2347:
2348: my @stack;
2349:
2350: $self->populateStack(\@stack);
2351:
2352: return \@stack;
2353: }
2354:
2355: # Private method: Calls the iterators recursively to populate the stack.
2356: sub populateStack {
2357: my $self=shift;
2358: my $stack = shift;
2359:
2360: push @$stack, $self->{HERE} if ($self->{HERE});
2361:
2362: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2363: $self->{RECURSIVE_ITERATOR}->populateStack($stack);
2364: }
2365: }
2366:
2367: 1;
2368:
2369: package Apache::lonnavmaps::DFSiterator;
2370:
2371: # Not documented in the perldoc: This is a simple iterator that just walks
2372: # through the nav map and presents the resources in a depth-first search
2373: # fashion, ignorant of conditionals, randomized resources, etc. It presents
2374: # BEGIN_MAP and END_MAP, but does not understand branches at all. It is
2375: # useful for pre-processing of some kind, and is in fact used by the main
2376: # iterator that way, but that's about it.
2377: # One could imagine merging this into the init routine of the main iterator,
2378: # but this might as well be left seperate, since it is possible some other
2379: # use might be found for it. - Jeremy
2380:
2381: # Unlike the main iterator, this DOES return all resources, even blank ones.
2382: # The main iterator needs them to correctly preprocess the map.
2383:
2384: sub BEGIN_MAP { return 1; } # begining of a new map
2385: sub END_MAP { return 2; } # end of the map
2386: sub FORWARD { return 1; } # go forward
2387: sub BACKWARD { return 2; }
2388:
2389: # Params: Nav map ref, first resource id/ref, finish resource id/ref,
2390: # filter hash ref (or undef), already seen hash or undef, condition
2391: # (as in main iterator), direction FORWARD or BACKWARD (undef->forward).
2392: sub new {
2393: # magic invocation to create a class instance
2394: my $proto = shift;
2395: my $class = ref($proto) || $proto;
2396: my $self = {};
2397:
2398: $self->{NAV_MAP} = shift;
2399: return undef unless ($self->{NAV_MAP});
2400:
2401: $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
2402: $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
2403:
2404: # If the given resources are just the ID of the resource, get the
2405: # objects
2406: if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} =
2407: $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
2408: if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} =
2409: $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
2410:
2411: $self->{FILTER} = shift;
2412:
2413: # A hash, used as a set, of resource already seen
2414: $self->{ALREADY_SEEN} = shift;
2415: if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
2416: $self->{CONDITION} = shift;
2417: $self->{DIRECTION} = shift || FORWARD();
2418:
2419: # Flag: Have we started yet?
2420: $self->{STARTED} = 0;
2421:
2422: # Should we continue calling the recursive iterator, if any?
2423: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2424: # The recursive iterator, if any
2425: $self->{RECURSIVE_ITERATOR} = undef;
2426: # Are we recursing on a map, or a branch?
2427: $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
2428: # And the count of how deep it is, so that this iterator can keep track of
2429: # when to pick back up again.
2430: $self->{RECURSIVE_DEPTH} = 0;
2431:
2432: # For keeping track of our branches, we maintain our own stack
2433: $self->{STACK} = [];
2434:
2435: # Start with the first resource
2436: if ($self->{DIRECTION} == FORWARD) {
2437: push @{$self->{STACK}}, $self->{FIRST_RESOURCE};
2438: } else {
2439: push @{$self->{STACK}}, $self->{FINISH_RESOURCE};
2440: }
2441:
2442: bless($self);
2443: return $self;
2444: }
2445:
2446: sub next {
2447: my $self = shift;
2448:
2449: # Are we using a recursive iterator? If so, pull from that and
2450: # watch the depth; we want to resume our level at the correct time.
2451: if ($self->{RECURSIVE_ITERATOR_FLAG}) {
2452: # grab the next from the recursive iterator
2453: my $next = $self->{RECURSIVE_ITERATOR}->next();
2454:
2455: # is it a begin or end map? Update depth if so
2456: if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
2457: if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
2458:
2459: # Are we back at depth 0? If so, stop recursing.
2460: if ($self->{RECURSIVE_DEPTH} == 0) {
2461: $self->{RECURSIVE_ITERATOR_FLAG} = 0;
2462: }
2463:
2464: return $next;
2465: }
2466:
2467: # Is there a current resource to grab? If not, then return
2468: # END_MAP, which will end the iterator.
2469: if (scalar(@{$self->{STACK}}) == 0) {
2470: return $self->END_MAP();
2471: }
2472:
2473: # Have we not yet begun? If not, return BEGIN_MAP and
2474: # remember that we've started.
2475: if ( !$self->{STARTED} ) {
2476: $self->{STARTED} = 1;
2477: return $self->BEGIN_MAP;
2478: }
2479:
2480: # Get the next resource in the branch
2481: $self->{HERE} = pop @{$self->{STACK}};
2482:
2483: # remember that we've seen this, so we don't return it again later
2484: $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
2485:
2486: # Get the next possible resources
2487: my $nextUnfiltered;
2488: if ($self->{DIRECTION} == FORWARD()) {
2489: $nextUnfiltered = $self->{HERE}->getNext();
2490: } else {
2491: $nextUnfiltered = $self->{HERE}->getPrevious();
2492: }
2493: my $next = [];
2494:
2495: # filter the next possibilities to remove things we've
2496: # already seen.
2497: foreach (@$nextUnfiltered) {
2498: if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
2499: push @$next, $_;
2500: }
2501: }
2502:
2503: while (@$next) {
2504: # copy the next possibilities over to the stack
2505: push @{$self->{STACK}}, shift @$next;
2506: }
2507:
2508: # If this is a map and we want to recurse down it... (not filtered out)
2509: if ($self->{HERE}->is_map() &&
2510: (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
2511: $self->{RECURSIVE_ITERATOR_FLAG} = 1;
2512: my $firstResource = $self->{HERE}->map_start();
2513: my $finishResource = $self->{HERE}->map_finish();
2514:
2515: $self->{RECURSIVE_ITERATOR} =
2516: Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource,
2517: $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
2518: $self->{CONDITION}, $self->{DIRECTION});
2519: }
2520:
2521: return $self->{HERE};
2522: }
2523:
2524: 1;
2525:
2526: package Apache::lonnavmaps::resource;
2527:
2528: use Apache::lonnet;
2529:
2530: =pod
2531:
2532: =head1 Object: resource
2533:
2534: A resource object encapsulates a resource in a resource map, allowing
2535: easy manipulation of the resource, querying the properties of the
2536: resource (including user properties), and represents a reference that
2537: can be used as the canonical representation of the resource by
2538: lonnavmap clients like renderers.
2539:
2540: A resource only makes sense in the context of a navmap, as some of the
2541: data is stored in the navmap object.
2542:
2543: You will probably never need to instantiate this object directly. Use
2544: Apache::lonnavmaps::navmap, and use the "start" method to obtain the
2545: starting resource.
2546:
2547: =head2 Public Members
2548:
2549: resource objects have a hash called DATA ($resourceRef->{DATA}) that
2550: you can store whatever you want in. This allows you to easily do
2551: two-pass algorithms without worrying about managing your own
2552: resource->data hash.
2553:
2554: =head2 Methods
2555:
2556: =over 4
2557:
2558: =item * B<new>($navmapRef, $idString):
2559:
2560: The first arg is a reference to the parent navmap object. The second
2561: is the idString of the resource itself. Very rarely, if ever, called
2562: directly. Use the nav map->getByID() method.
2563:
2564: =back
2565:
2566: =cut
2567:
2568: sub new {
2569: # magic invocation to create a class instance
2570: my $proto = shift;
2571: my $class = ref($proto) || $proto;
2572: my $self = {};
2573:
2574: $self->{NAV_MAP} = shift;
2575: $self->{ID} = shift;
2576:
2577: # Store this new resource in the parent nav map's cache.
2578: $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
2579: $self->{RESOURCE_ERROR} = 0;
2580:
2581: # A hash that can be used by two-pass algorithms to store data
2582: # about this resource in. Not used by the resource object
2583: # directly.
2584: $self->{DATA} = {};
2585:
2586: bless($self);
2587:
2588: return $self;
2589: }
2590:
2591: # private function: simplify the NAV_HASH lookups we keep doing
2592: # pass the name, and to automatically append my ID, pass a true val on the
2593: # second param
2594: sub navHash {
2595: my $self = shift;
2596: my $param = shift;
2597: my $id = shift;
2598: return $self->{NAV_MAP}->navhash($param . ($id?$self->{ID}:""));
2599: }
2600:
2601: =pod
2602:
2603: B<Metadata Retreival>
2604:
2605: These are methods that help you retrieve metadata about the resource:
2606: Method names are based on the fields in the compiled course
2607: representation.
2608:
2609: =over 4
2610:
2611: =item * B<compTitle>:
2612:
2613: Returns a "composite title", that is equal to $res->title() if the
2614: resource has a title, and is otherwise the last part of the URL (e.g.,
2615: "problem.problem").
2616:
2617: =item * B<ext>:
2618:
2619: Returns true if the resource is external.
2620:
2621: =item * B<goesto>:
2622:
2623: Returns the "goesto" value from the compiled nav map. (It is likely
2624: you want to use B<getNext> instead.)
2625:
2626: =item * B<kind>:
2627:
2628: Returns the kind of the resource from the compiled nav map.
2629:
2630: =item * B<randomout>:
2631:
2632: Returns true if this resource was chosen to NOT be shown to the user
2633: by the random map selection feature. In other words, this is usually
2634: false.
2635:
2636: =item * B<randompick>:
2637:
2638: Returns true for a map if the randompick feature is being used on the
2639: map. (?)
2640:
2641: =item * B<src>:
2642:
2643: Returns the source for the resource.
2644:
2645: =item * B<symb>:
2646:
2647: Returns the symb for the resource.
2648:
2649: =item * B<title>:
2650:
2651: Returns the title of the resource.
2652:
2653: =item * B<to>:
2654:
2655: Returns the "to" value from the compiled nav map. (It is likely you
2656: want to use B<getNext> instead.)
2657:
2658: =back
2659:
2660: =cut
2661:
2662: # These info functions can be used directly, as they don't return
2663: # resource information.
2664: sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
2665: sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
2666: sub from { my $self=shift; return $self->navHash("from_", 1); }
2667: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
2668: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
2669: sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
2670: sub randompick {
2671: my $self = shift;
2672: return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
2673: '.0.parameter_randompick'};
2674: }
2675: sub src {
2676: my $self=shift;
2677: return $self->navHash("src_", 1);
2678: }
2679: sub symb {
2680: my $self=shift;
2681: (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
2682: my $symbSrc = &Apache::lonnet::declutter($self->src());
2683: return &Apache::lonnet::declutter(
2684: $self->navHash('map_id_'.$first))
2685: . '___' . $second . '___' . $symbSrc;
2686: }
2687: sub title { my $self=shift; return $self->navHash("title_", 1); }
2688: sub to { my $self=shift; return $self->navHash("to_", 1); }
2689: sub compTitle {
2690: my $self = shift;
2691: my $title = $self->title();
2692: $title=~s/\&colon\;/\:/gs;
2693: if (!$title) {
2694: $title = $self->src();
2695: $title = substr($title, rindex($title, '/') + 1);
2696: }
2697: return $title;
2698: }
2699: =pod
2700:
2701: B<Predicate Testing the Resource>
2702:
2703: These methods are shortcuts to deciding if a given resource has a given property.
2704:
2705: =over 4
2706:
2707: =item * B<is_map>:
2708:
2709: Returns true if the resource is a map type.
2710:
2711: =item * B<is_problem>:
2712:
2713: Returns true if the resource is a problem type, false
2714: otherwise. (Looks at the extension on the src field; might need more
2715: to work correctly.)
2716:
2717: =item * B<is_page>:
2718:
2719: Returns true if the resource is a page.
2720:
2721: =item * B<is_sequence>:
2722:
2723: Returns true if the resource is a sequence.
2724:
2725: =back
2726:
2727: =cut
2728:
2729:
2730: sub is_html {
2731: my $self=shift;
2732: my $src = $self->src();
2733: return ($src =~ /html$/);
2734: }
2735: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
2736: sub is_page {
2737: my $self=shift;
2738: my $src = $self->src();
2739: return ($src =~ /page$/);
2740: }
2741: sub is_problem {
2742: my $self=shift;
2743: my $src = $self->src();
2744: return ($src =~ /problem$/);
2745: }
2746: sub is_sequence {
2747: my $self=shift;
2748: my $src = $self->src();
2749: return ($src =~ /sequence$/);
2750: }
2751:
2752: # Private method: Shells out to the parmval in the nav map, handler parts.
2753: sub parmval {
2754: my $self = shift;
2755: my $what = shift;
2756: my $part = shift || "0";
2757: return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
2758: }
2759:
2760: =pod
2761:
2762: B<Map Methods>
2763:
2764: These methods are useful for getting information about the map
2765: properties of the resource, if the resource is a map (B<is_map>).
2766:
2767: =over 4
2768:
2769: =item * B<map_finish>:
2770:
2771: Returns a reference to a resource object corresponding to the finish
2772: resource of the map.
2773:
2774: =item * B<map_pc>:
2775:
2776: Returns the pc value of the map, which is the first number that
2777: appears in the resource ID of the resources in the map, and is the
2778: number that appears around the middle of the symbs of the resources in
2779: that map.
2780:
2781: =item * B<map_start>:
2782:
2783: Returns a reference to a resource object corresponding to the start
2784: resource of the map.
2785:
2786: =item * B<map_type>:
2787:
2788: Returns a string with the type of the map in it.
2789:
2790: =back
2791:
2792: =cut
2793:
2794: sub map_finish {
2795: my $self = shift;
2796: my $src = $self->src();
2797: $src = Apache::lonnet::clutter($src);
2798: my $res = $self->navHash("map_finish_$src", 0);
2799: $res = $self->{NAV_MAP}->getById($res);
2800: return $res;
2801: }
2802: sub map_pc {
2803: my $self = shift;
2804: my $src = $self->src();
2805: return $self->navHash("map_pc_$src", 0);
2806: }
2807: sub map_start {
2808: my $self = shift;
2809: my $src = $self->src();
2810: $src = Apache::lonnet::clutter($src);
2811: my $res = $self->navHash("map_start_$src", 0);
2812: $res = $self->{NAV_MAP}->getById($res);
2813: return $res;
2814: }
2815: sub map_type {
2816: my $self = shift;
2817: my $pc = $self->map_pc();
2818: return $self->navHash("map_type_$pc", 0);
2819: }
2820:
2821:
2822:
2823: #####
2824: # Property queries
2825: #####
2826:
2827: # These functions will be responsible for returning the CORRECT
2828: # VALUE for the parameter, no matter what. So while they may look
2829: # like direct calls to parmval, they can be more then that.
2830: # So, for instance, the duedate function should use the "duedatetype"
2831: # information, rather then the resource object user.
2832:
2833: =pod
2834:
2835: =head2 Resource Parameters
2836:
2837: In order to use the resource parameters correctly, the nav map must
2838: have been instantiated with genCourseAndUserOptions set to true, so
2839: the courseopt and useropt is read correctly. Then, you can call these
2840: functions to get the relevant parameters for the resource. Each
2841: function defaults to part "0", but can be directed to another part by
2842: passing the part as the parameter.
2843:
2844: These methods are responsible for getting the parameter correct, not
2845: merely reflecting the contents of the GDBM hashes. As we move towards
2846: dates relative to other dates, these methods should be updated to
2847: reflect that. (Then, anybody using these methods will not have to update
2848: their code.)
2849:
2850: =over 4
2851:
2852: =item * B<acc>:
2853:
2854: Get the Client IP/Name Access Control information.
2855:
2856: =item * B<answerdate>:
2857:
2858: Get the answer-reveal date for the problem.
2859:
2860: =item * B<duedate>:
2861:
2862: Get the due date for the problem.
2863:
2864: =item * B<tries>:
2865:
2866: Get the number of tries the student has used on the problem.
2867:
2868: =item * B<maxtries>:
2869:
2870: Get the number of max tries allowed.
2871:
2872: =item * B<opendate>:
2873:
2874: Get the open date for the problem.
2875:
2876: =item * B<sig>:
2877:
2878: Get the significant figures setting.
2879:
2880: =item * B<tol>:
2881:
2882: Get the tolerance for the problem.
2883:
2884: =item * B<tries>:
2885:
2886: Get the number of tries the user has already used on the problem.
2887:
2888: =item * B<type>:
2889:
2890: Get the question type for the problem.
2891:
2892: =item * B<weight>:
2893:
2894: Get the weight for the problem.
2895:
2896: =back
2897:
2898: =cut
2899:
2900: sub acc {
2901: (my $self, my $part) = @_;
2902: return $self->parmval("acc", $part);
2903: }
2904: sub answerdate {
2905: (my $self, my $part) = @_;
2906: # Handle intervals
2907: if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
2908: return $self->duedate($part) +
2909: $self->parmval("answerdate", $part);
2910: }
2911: return $self->parmval("answerdate", $part);
2912: }
2913: sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
2914: sub duedate {
2915: (my $self, my $part) = @_;
2916: return $self->parmval("duedate", $part);
2917: }
2918: sub maxtries {
2919: (my $self, my $part) = @_;
2920: return $self->parmval("maxtries", $part);
2921: }
2922: sub opendate {
2923: (my $self, my $part) = @_;
2924: if ($self->parmval("opendate.type", $part) eq 'date_interval') {
2925: return $self->duedate($part) -
2926: $self->parmval("opendate", $part);
2927: }
2928: return $self->parmval("opendate");
2929: }
2930: sub sig {
2931: (my $self, my $part) = @_;
2932: return $self->parmval("sig", $part);
2933: }
2934: sub tol {
2935: (my $self, my $part) = @_;
2936: return $self->parmval("tol", $part);
2937: }
2938: sub tries {
2939: my $self = shift;
2940: my $tries = $self->queryRestoreHash('tries', shift);
2941: if (!defined($tries)) { return '0';}
2942: return $tries;
2943: }
2944: sub type {
2945: (my $self, my $part) = @_;
2946: return $self->parmval("type", $part);
2947: }
2948: sub weight {
2949: my $self = shift; my $part = shift;
2950: return $self->parmval("weight", $part);
2951: }
2952:
2953: # Multiple things need this
2954: sub getReturnHash {
2955: my $self = shift;
2956:
2957: if (!defined($self->{RETURN_HASH})) {
2958: my %tmpHash = &Apache::lonnet::restore($self->symb());
2959: $self->{RETURN_HASH} = \%tmpHash;
2960: }
2961: }
2962:
2963: ######
2964: # Status queries
2965: ######
2966:
2967: # These methods query the status of problems.
2968:
2969: # If we need to count parts, this function determines the number of
2970: # parts from the metadata. When called, it returns a reference to a list
2971: # of strings corresponding to the parts. (Thus, using it in a scalar context
2972: # tells you how many parts you have in the problem:
2973: # $partcount = scalar($resource->countParts());
2974: # Don't use $self->{PARTS} directly because you don't know if it's been
2975: # computed yet.
2976:
2977: =pod
2978:
2979: =head2 Resource misc
2980:
2981: Misc. functions for the resource.
2982:
2983: =over 4
2984:
2985: =item * B<hasDiscussion>:
2986:
2987: Returns a false value if there has been discussion since the user last
2988: logged in, true if there has. Always returns false if the discussion
2989: data was not extracted when the nav map was constructed.
2990:
2991: =item * B<getFeedback>:
2992:
2993: Gets the feedback for the resource and returns the raw feedback string
2994: for the resource, or the null string if there is no feedback or the
2995: email data was not extracted when the nav map was constructed. Usually
2996: used like this:
2997:
2998: for (split(/\,/, $res->getFeedback())) {
2999: my $link = &Apache::lonnet::escape($_);
3000: ...
3001:
3002: and use the link as appropriate.
3003:
3004: =cut
3005:
3006: sub hasDiscussion {
3007: my $self = shift;
3008: return $self->{NAV_MAP}->hasDiscussion($self->symb());
3009: }
3010:
3011: sub getFeedback {
3012: my $self = shift;
3013: my $source = $self->src();
3014: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3015: return $self->{NAV_MAP}->getFeedback($source);
3016: }
3017:
3018: sub getErrors {
3019: my $self = shift;
3020: my $source = $self->src();
3021: if ($source =~ /^\/res\//) { $source = substr $source, 5; }
3022: return $self->{NAV_MAP}->getErrors($source);
3023: }
3024:
3025: =pod
3026:
3027: =item * B<parts>():
3028:
3029: Returns a list reference containing sorted strings corresponding to
3030: each part of the problem. To count the number of parts, use the list
3031: in a scalar context, and subtract one if greater than two. (One part
3032: problems have a part 0. Multi-parts have a part 0, plus a part for
3033: each part. Filtering part 0 if you want it is up to you.)
3034:
3035: =item * B<countParts>():
3036:
3037: Returns the number of parts of the problem a student can answer. Thus,
3038: for single part problems, returns 1. For multipart, it returns the
3039: number of parts in the problem, not including psuedo-part 0. Thus,
3040: B<parts> may return an array with fewer parts in it then countParts
3041: might lead you to believe.
3042:
3043: =back
3044:
3045: =cut
3046:
3047: sub parts {
3048: my $self = shift;
3049:
3050: if ($self->ext) { return ['0']; }
3051:
3052: $self->extractParts();
3053: return $self->{PARTS};
3054: }
3055:
3056: sub countParts {
3057: my $self = shift;
3058:
3059: my $parts = $self->parts();
3060: my $delta = 0;
3061: for my $part (@$parts) {
3062: if ($part eq '0') { $delta--; }
3063: }
3064:
3065: if ($self->{RESOURCE_ERROR}) {
3066: return 0;
3067: }
3068:
3069: return scalar(@{$parts}) + $delta;
3070: }
3071:
3072: # Private function: Extracts the parts information and saves it
3073: sub extractParts {
3074: my $self = shift;
3075:
3076: return if (defined($self->{PARTS}));
3077: return if ($self->ext);
3078:
3079: $self->{PARTS} = [];
3080:
3081: my %parts;
3082:
3083: # Retrieve part count, if this is a problem
3084: if ($self->is_problem()) {
3085: my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
3086: if (!$metadata) {
3087: $self->{RESOURCE_ERROR} = 1;
3088: $self->{PARTS} = [];
3089: return;
3090: }
3091: foreach (split(/\,/,$metadata)) {
3092: if ($_ =~ /^part_(.*)$/) {
3093: my $part = $1;
3094: # This floods the logs if it blows up
3095: if (defined($parts{$part})) {
3096: Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
3097: }
3098:
3099: # check to see if part is turned off.
3100:
3101: if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
3102: $parts{$part} = 1;
3103: }
3104: }
3105: }
3106:
3107:
3108: my @sortedParts = sort keys %parts;
3109: $self->{PARTS} = \@sortedParts;
3110: }
3111:
3112: return;
3113: }
3114:
3115: =pod
3116:
3117: =head2 Resource Status
3118:
3119: Problem resources have status information, reflecting their various
3120: dates and completion statuses.
3121:
3122: There are two aspects to the status: the date-related information and
3123: the completion information.
3124:
3125: Idiomatic usage of these two methods would probably look something
3126: like
3127:
3128: foreach ($resource->parts()) {
3129: my $dateStatus = $resource->getDateStatus($_);
3130: my $completionStatus = $resource->getCompletionStatus($_);
3131:
3132: or
3133:
3134: my $status = $resource->status($_);
3135:
3136: ... use it here ...
3137: }
3138:
3139: Which you use depends on exactly what you are looking for. The
3140: status() function has been optimized for the nav maps display and may
3141: not precisely match what you need elsewhere.
3142:
3143: The symbolic constants shown below can be accessed through the
3144: resource object: C<$res->OPEN>.
3145:
3146: =over 4
3147:
3148: =item * B<getDateStatus>($part):
3149:
3150: ($part defaults to 0). A convenience function that returns a symbolic
3151: constant telling you about the date status of the part. The possible
3152: return values are:
3153:
3154: =back
3155:
3156: B<Date Codes>
3157:
3158: =over 4
3159:
3160: =item * B<OPEN_LATER>:
3161:
3162: The problem will be opened later.
3163:
3164: =item * B<OPEN>:
3165:
3166: Open and not yet due.
3167:
3168:
3169: =item * B<PAST_DUE_ANSWER_LATER>:
3170:
3171: The due date has passed, but the answer date has not yet arrived.
3172:
3173: =item * B<PAST_DUE_NO_ANSWER>:
3174:
3175: The due date has passed and there is no answer opening date set.
3176:
3177: =item * B<ANSWER_OPEN>:
3178:
3179: The answer date is here.
3180:
3181: =item * B<NETWORK_FAILURE>:
3182:
3183: The information is unknown due to network failure.
3184:
3185: =back
3186:
3187: =cut
3188:
3189: # Apparently the compiler optimizes these into constants automatically
3190: sub OPEN_LATER { return 0; }
3191: sub OPEN { return 1; }
3192: sub PAST_DUE_NO_ANSWER { return 2; }
3193: sub PAST_DUE_ANSWER_LATER { return 3; }
3194: sub ANSWER_OPEN { return 4; }
3195: sub NOTHING_SET { return 5; }
3196: sub NETWORK_FAILURE { return 100; }
3197:
3198: # getDateStatus gets the date status for a given problem part.
3199: # Because answer date, due date, and open date are fully independent
3200: # (i.e., it is perfectly possible to *only* have an answer date),
3201: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
3202: # (past, future, none given). This function handles this with a decision
3203: # tree. Read the comments to follow the decision tree.
3204:
3205: sub getDateStatus {
3206: my $self = shift;
3207: my $part = shift;
3208: $part = "0" if (!defined($part));
3209:
3210: # Always return network failure if there was one.
3211: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3212:
3213: my $now = time();
3214:
3215: my $open = $self->opendate($part);
3216: my $due = $self->duedate($part);
3217: my $answer = $self->answerdate($part);
3218:
3219: if (!$open && !$due && !$answer) {
3220: # no data on the problem at all
3221: # should this be the same as "open later"? think multipart.
3222: return $self->NOTHING_SET;
3223: }
3224: if (!$open || $now < $open) {return $self->OPEN_LATER}
3225: if (!$due || $now < $due) {return $self->OPEN}
3226: if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
3227: if ($answer) { return $self->ANSWER_OPEN; }
3228: return PAST_DUE_NO_ANSWER;
3229: }
3230:
3231: =pod
3232:
3233: B<>
3234:
3235: =over 4
3236:
3237: =item * B<getCompletionStatus>($part):
3238:
3239: ($part defaults to 0.) A convenience function that returns a symbolic
3240: constant telling you about the completion status of the part, with the
3241: following possible results:
3242:
3243: =back
3244:
3245: B<Completion Codes>
3246:
3247: =over 4
3248:
3249: =item * B<NOT_ATTEMPTED>:
3250:
3251: Has not been attempted at all.
3252:
3253: =item * B<INCORRECT>:
3254:
3255: Attempted, but wrong by student.
3256:
3257: =item * B<INCORRECT_BY_OVERRIDE>:
3258:
3259: Attempted, but wrong by instructor override.
3260:
3261: =item * B<CORRECT>:
3262:
3263: Correct or correct by instructor.
3264:
3265: =item * B<CORRECT_BY_OVERRIDE>:
3266:
3267: Correct by instructor override.
3268:
3269: =item * B<EXCUSED>:
3270:
3271: Excused. Not yet implemented.
3272:
3273: =item * B<NETWORK_FAILURE>:
3274:
3275: Information not available due to network failure.
3276:
3277: =item * B<ATTEMPTED>:
3278:
3279: Attempted, and not yet graded.
3280:
3281: =back
3282:
3283: =cut
3284:
3285: sub NOT_ATTEMPTED { return 10; }
3286: sub INCORRECT { return 11; }
3287: sub INCORRECT_BY_OVERRIDE { return 12; }
3288: sub CORRECT { return 13; }
3289: sub CORRECT_BY_OVERRIDE { return 14; }
3290: sub EXCUSED { return 15; }
3291: sub ATTEMPTED { return 16; }
3292:
3293: sub getCompletionStatus {
3294: my $self = shift;
3295: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3296:
3297: my $status = $self->queryRestoreHash('solved', shift);
3298:
3299: # Left as seperate if statements in case we ever do more with this
3300: if ($status eq 'correct_by_student') {return $self->CORRECT;}
3301: if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
3302: if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
3303: if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
3304: if ($status eq 'excused') {return $self->EXCUSED; }
3305: if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
3306: return $self->NOT_ATTEMPTED;
3307: }
3308:
3309: sub queryRestoreHash {
3310: my $self = shift;
3311: my $hashentry = shift;
3312: my $part = shift;
3313: $part = "0" if (!defined($part));
3314: return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
3315:
3316: $self->getReturnHash();
3317:
3318: return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
3319: }
3320:
3321: =pod
3322:
3323: B<Composite Status>
3324:
3325: Along with directly returning the date or completion status, the
3326: resource object includes a convenience function B<status>() that will
3327: combine the two status tidbits into one composite status that can
3328: represent the status of the resource as a whole. The precise logic is
3329: documented in the comments of the status method. The following results
3330: may be returned, all available as methods on the resource object
3331: ($res->NETWORK_FAILURE):
3332:
3333: =over 4
3334:
3335: =item * B<NETWORK_FAILURE>:
3336:
3337: The network has failed and the information is not available.
3338:
3339: =item * B<NOTHING_SET>:
3340:
3341: No dates have been set for this problem (part) at all. (Because only
3342: certain parts of a multi-part problem may be assigned, this can not be
3343: collapsed into "open later", as we do not know a given part will EVER
3344: be opened. For single part, this is the same as "OPEN_LATER".)
3345:
3346: =item * B<CORRECT>:
3347:
3348: For any reason at all, the part is considered correct.
3349:
3350: =item * B<EXCUSED>:
3351:
3352: For any reason at all, the problem is excused.
3353:
3354: =item * B<PAST_DUE_NO_ANSWER>:
3355:
3356: The problem is past due, not considered correct, and no answer date is
3357: set.
3358:
3359: =item * B<PAST_DUE_ANSWER_LATER>:
3360:
3361: The problem is past due, not considered correct, and an answer date in
3362: the future is set.
3363:
3364: =item * B<ANSWER_OPEN>:
3365:
3366: The problem is past due, not correct, and the answer is now available.
3367:
3368: =item * B<OPEN_LATER>:
3369:
3370: The problem is not yet open.
3371:
3372: =item * B<TRIES_LEFT>:
3373:
3374: The problem is open, has been tried, is not correct, but there are
3375: tries left.
3376:
3377: =item * B<INCORRECT>:
3378:
3379: The problem is open, and all tries have been used without getting the
3380: correct answer.
3381:
3382: =item * B<OPEN>:
3383:
3384: The item is open and not yet tried.
3385:
3386: =item * B<ATTEMPTED>:
3387:
3388: The problem has been attempted.
3389:
3390: =back
3391:
3392: =cut
3393:
3394: sub TRIES_LEFT { return 10; }
3395:
3396: sub status {
3397: my $self = shift;
3398: my $part = shift;
3399: if (!defined($part)) { $part = "0"; }
3400: my $completionStatus = $self->getCompletionStatus($part);
3401: my $dateStatus = $self->getDateStatus($part);
3402:
3403: # What we have is a two-dimensional matrix with 4 entries on one
3404: # dimension and 5 entries on the other, which we want to colorize,
3405: # plus network failure and "no date data at all".
3406:
3407: if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
3408:
3409: # There are a few whole rows we can dispose of:
3410: if ($completionStatus == CORRECT ||
3411: $completionStatus == CORRECT_BY_OVERRIDE ) {
3412: return CORRECT;
3413: }
3414:
3415: if ($completionStatus == ATTEMPTED) {
3416: return ATTEMPTED;
3417: }
3418:
3419: # If it's EXCUSED, then return that no matter what
3420: if ($completionStatus == EXCUSED) {
3421: return EXCUSED;
3422: }
3423:
3424: if ($dateStatus == NOTHING_SET) {
3425: return NOTHING_SET;
3426: }
3427:
3428: # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
3429: # by 4 matrix (date statuses).
3430:
3431: if ($dateStatus == PAST_DUE_ANSWER_LATER ||
3432: $dateStatus == PAST_DUE_NO_ANSWER ) {
3433: return $dateStatus;
3434: }
3435:
3436: if ($dateStatus == ANSWER_OPEN) {
3437: return ANSWER_OPEN;
3438: }
3439:
3440: # Now: (incorrect, incorrect_override, not_attempted) x
3441: # (open_later), (open)
3442:
3443: if ($dateStatus == OPEN_LATER) {
3444: return OPEN_LATER;
3445: }
3446:
3447: # If it's WRONG...
3448: if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
3449: # and there are TRIES LEFT:
3450: if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
3451: return TRIES_LEFT;
3452: }
3453: return INCORRECT; # otherwise, return orange; student can't fix this
3454: }
3455:
3456: # Otherwise, it's untried and open
3457: return OPEN;
3458: }
3459:
3460: =pod
3461:
3462: =head2 Resource/Nav Map Navigation
3463:
3464: =over 4
3465:
3466: =item * B<getNext>():
3467:
3468: Retreive an array of the possible next resources after this
3469: one. Always returns an array, even in the one- or zero-element case.
3470:
3471: =item * B<getPrevious>():
3472:
3473: Retreive an array of the possible previous resources from this
3474: one. Always returns an array, even in the one- or zero-element case.
3475:
3476: =cut
3477:
3478: sub getNext {
3479: my $self = shift;
3480: my @branches;
3481: my $to = $self->to();
3482: foreach my $branch ( split(/,/, $to) ) {
3483: my $choice = $self->{NAV_MAP}->getById($branch);
3484: my $next = $choice->goesto();
3485: $next = $self->{NAV_MAP}->getById($next);
3486:
3487: push @branches, $next;
3488: }
3489: return \@branches;
3490: }
3491:
3492: sub getPrevious {
3493: my $self = shift;
3494: my @branches;
3495: my $from = $self->from();
3496: foreach my $branch ( split /,/, $from) {
3497: my $choice = $self->{NAV_MAP}->getById($branch);
3498: my $prev = $choice->comesfrom();
3499: $prev = $self->{NAV_MAP}->getById($prev);
3500:
3501: push @branches, $prev;
3502: }
3503: return \@branches;
3504: }
3505:
3506: sub browsePriv {
3507: my $self = shift;
3508: if (defined($self->{BROWSE_PRIV})) {
3509: return $self->{BROWSE_PRIV};
3510: }
3511:
3512: $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
3513: }
3514:
3515: =pod
3516:
3517: =back
3518:
3519: =cut
3520:
3521: 1;
3522:
3523: __END__
3524:
3525:
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