Annotation of loncom/interface/lonnavmaps.pm, revision 1.62

1.2       www         1: # The LearningOnline Network with CAPA
                      2: # Navigate Maps Handler
1.1       www         3: #
1.59      bowersj2    4: # $Id: lonnavmaps.pm,v 1.58 2002/10/01 07:20:31 albertel Exp $
1.20      albertel    5: #
                      6: # Copyright Michigan State University Board of Trustees
                      7: #
                      8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      9: #
                     10: # LON-CAPA is free software; you can redistribute it and/or modify
                     11: # it under the terms of the GNU General Public License as published by
                     12: # the Free Software Foundation; either version 2 of the License, or
                     13: # (at your option) any later version.
                     14: #
                     15: # LON-CAPA is distributed in the hope that it will be useful,
                     16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     18: # GNU General Public License for more details.
                     19: #
                     20: # You should have received a copy of the GNU General Public License
                     21: # along with LON-CAPA; if not, write to the Free Software
                     22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     23: #
                     24: # /home/httpd/html/adm/gpl.txt
                     25: #
                     26: # http://www.lon-capa.org/
                     27: #
1.2       www        28: # (Page Handler
1.1       www        29: #
1.2       www        30: # (TeX Content Handler
1.1       www        31: #
1.2       www        32: # 05/29/00,05/30 Gerd Kortemeyer)
                     33: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
                     34: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
1.1       www        35: #
1.17      www        36: # 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
1.21      www        37: # YEAR=2002
                     38: # 1/1 Gerd Kortemeyer
                     39: #
1.2       www        40: 
1.1       www        41: package Apache::lonnavmaps;
                     42: 
                     43: use strict;
1.2       www        44: use Apache::Constants qw(:common :http);
                     45: use Apache::lonnet();
1.18      albertel   46: use Apache::loncommon();
1.2       www        47: use HTML::TokeParser;
                     48: use GDBM_File;
                     49: 
                     50: # -------------------------------------------------------------- Module Globals
                     51: my %hash;
                     52: my @rows;
                     53: 
1.10      www        54: #
                     55: # These cache hashes need to be independent of user, resource and course
                     56: # (user and course can/should be in the keys)
                     57: #
                     58: 
                     59: my %courserdatas;
                     60: my %userrdatas;
                     61: 
                     62: #
                     63: # These global hashes are dependent on user, course and resource, 
                     64: # and need to be initialized every time when a sheet is calculated
                     65: #
                     66: my %courseopt;
                     67: my %useropt;
                     68: my %parmhash;
                     69: 
1.47      bowersj2   70: # This parameter keeps track of whether obtaining the user's information
                     71: # failed, which the colorizer in astatus can use
                     72: my $networkFailedFlag = 0;
                     73: 
1.2       www        74: # ------------------------------------------------------------------ Euclid gcd
                     75: 
                     76: sub euclid {
                     77:     my ($e,$f)=@_;
                     78:     my $a; my $b; my $r;
                     79:     if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
                     80:     while ($r!=0) {
1.51      bowersj2   81:         $a=$b; $b=$r;
1.2       www        82:         $r=$a%$b;
                     83:     }
                     84:     return $b;
                     85: }
                     86: 
1.10      www        87: # --------------------------------------------------------------------- Parmval
                     88: 
                     89: # -------------------------------------------- Figure out a cascading parameter
                     90: #
                     91: # For this function to work
                     92: #
                     93: # * parmhash needs to be tied
                     94: # * courseopt and useropt need to be initialized for this user and course
                     95: #
                     96: 
                     97: sub parmval {
                     98:     my ($what,$symb)=@_;
                     99:     my $cid=$ENV{'request.course.id'};
                    100:     my $csec=$ENV{'request.course.sec'};
                    101:     my $uname=$ENV{'user.name'};
                    102:     my $udom=$ENV{'user.domain'};
                    103: 
                    104:     unless ($symb) { return ''; }
                    105:     my $result='';
                    106: 
                    107:     my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
                    108: 
                    109: # ----------------------------------------------------- Cascading lookup scheme
1.24      albertel  110:     my $rwhat=$what;
                    111:     $what=~s/^parameter\_//;
                    112:     $what=~s/\_/\./;
                    113: 
                    114:     my $symbparm=$symb.'.'.$what;
                    115:     my $mapparm=$mapname.'___(all).'.$what;
                    116:     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
                    117: 
                    118:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                    119:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                    120:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                    121: 
                    122:     my $courselevel= $usercourseprefix.'.'.$what;
                    123:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                    124:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                    125: 
                    126: # ---------------------------------------------------------- first, check user
1.57      albertel  127:     if (defined($uname)) {
                    128:         if (defined($useropt{$courselevelr})) { return $useropt{$courselevelr}; }
                    129:         if (defined($useropt{$courselevelm})) { return $useropt{$courselevelm}; }
                    130:         if (defined($useropt{$courselevel})) { return $useropt{$courselevel}; }
1.24      albertel  131:     }
1.10      www       132: 
1.24      albertel  133: # ------------------------------------------------------- second, check course
1.57      albertel  134:     if (defined($csec)) {
                    135:         if (defined($courseopt{$seclevelr})) { return $courseopt{$seclevelr}; }
                    136:         if (defined($courseopt{$seclevelm})) { return $courseopt{$seclevelm}; }
                    137:         if (defined($courseopt{$seclevel})) { return $courseopt{$seclevel}; }
1.24      albertel  138:     }
1.10      www       139: 
1.57      albertel  140:     if (defined($courseopt{$courselevelr})) { return $courseopt{$courselevelr}; }
                    141:     if (defined($courseopt{$courselevelm})) { return $courseopt{$courselevelm}; }
                    142:     if (defined($courseopt{$courselevel})) { return $courseopt{$courselevel}; }
1.10      www       143: 
1.24      albertel  144: # ----------------------------------------------------- third, check map parms
1.10      www       145: 
1.24      albertel  146:     my $thisparm=$parmhash{$symbparm};
1.57      albertel  147:     if (defined($thisparm)) { return $thisparm; }
1.10      www       148: 
1.24      albertel  149: # ----------------------------------------------------- fourth , check default
1.10      www       150: 
1.25      albertel  151:     my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57      albertel  152:     if (defined($default)) { return $default}
1.25      albertel  153: 
                    154: # --------------------------------------------------- fifth , cascade up parts
                    155: 
                    156:     my ($space,@qualifier)=split(/\./,$rwhat);
                    157:     my $qualifier=join('.',@qualifier);
                    158:     unless ($space eq '0') {
1.51      bowersj2  159:         my ($part,$id)=split(/\_/,$space);
                    160:         if ($id) {
                    161:             my $partgeneral=&parmval($part.".$qualifier",$symb);
1.57      albertel  162:             if (defined($partgeneral)) { return $partgeneral; }
1.51      bowersj2  163:         } else {
                    164:             my $resourcegeneral=&parmval("0.$qualifier",$symb);
1.57      albertel  165:             if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51      bowersj2  166:         }
1.25      albertel  167:     }
                    168:     return '';
1.10      www       169: }
                    170: 
                    171: 
                    172: 
1.9       www       173: # ------------------------------------------------------------- Find out status
1.25      albertel  174: # return codes
                    175: # tcode (timecode)
                    176: # 1: will open later
                    177: # 2: is open and not past due yet
                    178: # 3: is past due date
                    179: # 4: due in the next 24 hours
                    180: #
                    181: # code (curent solved status)
                    182: # 1: not attempted
                    183: # 2: attempted but wrong, or incorrect by instructor
                    184: # 3: solved or correct by instructor
1.29      albertel  185: # 4: partially correct (one or more parts correct)
                    186: # "excused" needs to be supported, but is not yet.
1.9       www       187: sub astatus {
                    188:     my $rid=shift;
1.29      albertel  189:     my $code=0;
1.9       www       190:     my $ctext='';
                    191:     $rid=~/(\d+)\.(\d+)/;
1.10      www       192:     my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
1.51      bowersj2  193:         &Apache::lonnet::declutter($hash{'src_'.$rid});
1.15      www       194:     my %duedate=();
                    195:     my %opendate=();
                    196:     my %answerdate=();
1.25      albertel  197:     # need to always check part 0's open/due/answer status
1.51      bowersj2  198:     foreach (sort(split(/\,/,&Apache::lonnet::metadata($hash{'src_'.$rid},'allpo\ssiblekeys')))) {
1.15      www       199:         if ($_=~/^parameter\_(.*)\_opendate$/) {
1.51      bowersj2  200:             my $part=$1;
1.15      www       201:             $duedate{$part}=&parmval($part.'.duedate',$symb);
                    202:             $opendate{$part}=&parmval($part.'.opendate',$symb);
                    203:             $answerdate{$part}=&parmval($part.'.answerdate',$symb);
1.49      www       204:             if (&parmval($part.'.opendate.type',$symb) eq 'date_interval') {
1.51      bowersj2  205:                 $opendate{$part}=$duedate{$part}-$opendate{$part};
1.49      www       206:             }
1.50      www       207:             if (&parmval($part.'.answerdate.type',$symb) eq 'date_interval') {
1.49      www       208:                 $answerdate{$part}=$duedate{$part}+$answerdate{$part};
                    209:             }
1.15      www       210:         }
1.25      albertel  211:     }
1.11      www       212:     my $now=time;
                    213:     my $tcode=0;
1.16      www       214: 
                    215:     my %returnhash=&Apache::lonnet::restore($symb);
                    216: 
1.25      albertel  217:     foreach (sort(keys(%opendate))) {
1.51      bowersj2  218:         my $duedate=$duedate{$_};
                    219:         my $opendate=$opendate{$_};
                    220:         my $answerdate=$answerdate{$_};
                    221:         my $preface='';
                    222:         unless ($_ eq '0') { $preface=' Part: '.$_.' '; }
                    223:         if ($opendate) {
                    224:             if ($now<$duedate || (!$duedate)) {
                    225:                 unless ($tcode==4) { $tcode=2; }
                    226:                 if ($duedate) {
                    227:                     $ctext.=$preface.'Due: '.localtime($duedate);
                    228:                 } else {
                    229:                     $ctext.=$preface.'No Due Date';
                    230:                 }
                    231:                 if ($now<$opendate) {
                    232:                     unless ($tcode) { $tcode=1; }
                    233:                     $ctext.=$preface.'Open: '.localtime($opendate);
                    234:                 }
                    235:                 if ($duedate && $duedate-$now<86400) {
                    236:                     $tcode=4;
                    237:                     $ctext.=$preface.'Due: '.localtime($duedate);
                    238:                 }
                    239:             } else {
                    240:                 unless (($tcode==4) || ($tcode eq 2)) { $tcode=3; }
                    241:                 if ($now<$answerdate) {
                    242:                     $ctext.='Answer: '.localtime($duedate);
                    243:                 }
                    244:             }
                    245:         } else {
                    246:             unless (($tcode==2) || ($tcode==4)) { $tcode=1; }
                    247:         }
                    248:         
                    249:         my $status=$returnhash{'resource.'.$_.'.solved'};
                    250:         
                    251:         if ($status eq 'correct_by_student') {
                    252:             if ($code==0||$code==3) { $code=3; } else { $code=4; }
                    253:             $ctext.=' solved';
                    254:         } elsif ($status eq 'correct_by_override') {
                    255:             if ($code==0||$code==3) { $code=3; } else { $code=4; }
                    256:             $ctext.=' override';
                    257:         } elsif ($status eq 'incorrect_attempted') {
                    258:             if ($code!=4 && $code!=3) { $code=2; }
                    259:             if ($code==3) { $code=4; }
                    260:             $ctext.=' ('.
                    261:                 ($returnhash{'resource.'.$_.'.tries'}?
                    262:                  $returnhash{'resource.'.$_.'.tries'}:'0');
                    263:             my $numtries = &parmval($_.'.maxtries',$symb);
                    264:             if ($numtries) { $ctext.='/'.$numtries.' tries'; }
                    265:             $ctext.=')';
                    266:         } elsif ($status eq 'incorrect_by_override') {
                    267:             if ($code!=4 && $code!=3) { $code=2; }
                    268:             if ($code==3) { $code=4; }
                    269:             $ctext.=' override';
                    270:         } elsif ($status eq 'excused') {
                    271:             if ($code==0||$code==3) { $code=3; } else { $code=4; }
                    272:             $ctext.=' excused';
                    273:         } else {
                    274:             if ($code==0) { $code=1; }
                    275:         }
1.25      albertel  276:     }
1.16      www       277: 
1.11      www       278:     return 'p'.$code.$tcode.'"'.$ctext.'"';
1.9       www       279: }
                    280: 
1.2       www       281: 
1.31      albertel  282: sub addresource {
1.32      albertel  283:     my ($resource,$sofar,$rid,$showtypes,$indent,$linkid)=@_;
1.31      albertel  284:     if ($showtypes eq 'problems') {
1.51      bowersj2  285:         if ($resource!~/\.(problem|exam|quiz|assess|survey|form)$/) {
                    286:             return;
                    287:         }
1.31      albertel  288:     }
                    289:     my $brepriv=&Apache::lonnet::allowed('bre',$resource);
                    290:     if ($hash{'src_'.$rid}) {
1.51      bowersj2  291:         if (($brepriv eq '2') || ($brepriv eq 'F')) {
                    292:             my $pprefix='';
                    293:             if ($resource=~/\.(problem|exam|quiz|assess|survey|form)$/) {
                    294:                 $pprefix=&astatus($rid);
                    295:             }
                    296:             $$sofar++;
                    297:             if ($indent) { $pprefix='i'.$indent.','.$pprefix; }
                    298:             if ($linkid) { $pprefix='l'.$linkid.','.$pprefix; }
                    299:             if (defined($rows[$$sofar])) {
                    300:                 $rows[$$sofar].='&'.$pprefix.$rid;
                    301:             } else {
                    302:                 $rows[$$sofar]=$pprefix.$rid;
                    303:             }
                    304:         }
1.31      albertel  305:     }
                    306: }
                    307: 
                    308: sub followlinks () {
1.32      albertel  309:     my ($rid,$sofar,$beenhere,$further,$showtypes,$indent,$linkid)=@_;
1.31      albertel  310:     my $mincond=1;
                    311:     my $next='';
                    312:     foreach (split(/\,/,$hash{'to_'.$rid})) {
1.51      bowersj2  313:         my $thiscond=
                    314:             &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
                    315:         if ($thiscond>=$mincond) {
                    316:             if ($next) {
                    317:                 $next.=','.$_.':'.$thiscond;
                    318:             } else {
                    319:                 $next=$_.':'.$thiscond;
                    320:             }
                    321:             if ($thiscond>$mincond) { $mincond=$thiscond; }
                    322:         }
1.31      albertel  323:     }
1.32      albertel  324:     my $col=0;
                    325:     &Apache::lonxml::debug("following links -$next-");
1.31      albertel  326:     foreach (split(/\,/,$next)) {
1.51      bowersj2  327:         my ($nextlinkid,$condval)=split(/\:/,$_);
                    328:         if ($condval>=$mincond) {
                    329:             my $now=&tracetable($sofar,$hash{'goesto_'.$nextlinkid},
                    330:                                 $beenhere,$showtypes,$indent,$linkid);
                    331:             if ($now>$further) {                
                    332:                 if ($col>0) {
                    333:                     my $string;
                    334:                     for(my $i=0;$i<$col;$i++) { $string.='&'; }
                    335:                     for(my $i=$further+1;$now-1>$i;$i++) {
                    336:                         $rows[$i]=$string.$rows[$i];
                    337:                     }
                    338:                 }
                    339:                 $further=$now;
                    340:             }
                    341:         }
                    342:         $col++;
1.31      albertel  343:     }
                    344:     return $further;
                    345: }
                    346: # ------------------------------------------------------------ Build page table
                    347: 
                    348: sub tracetable {
1.32      albertel  349:     my ($sofar,$rid,$beenhere,$showtypes,$indent,$linkid)=@_;
                    350:     my $newshowtypes=$showtypes;
1.31      albertel  351:     my $further=$sofar;
1.44      www       352: # $Apache::lonxml::debug=1;
1.32      albertel  353:     &Apache::lonxml::debug("$rid ; $linkid ; $sofar ; $beenhere ; ".$hash{'src_'.$rid});
                    354:     if ($beenhere=~/\&$rid\&/) { return $further; }
                    355:     $beenhere.=$rid.'&';
1.31      albertel  356: 
                    357:     if (defined($hash{'is_map_'.$rid})) {
1.51      bowersj2  358:         $sofar++;
                    359:         my $tprefix='';
                    360:         if ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
                    361:             eq 'sequence') {
                    362:             $tprefix='h';
                    363:         } elsif ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
                    364:                  eq 'page') {
                    365:             $tprefix='j';
                    366:             if ($indent) { $tprefix='i'.$indent.','.$tprefix; }
                    367:             if ($linkid) { $tprefix='l'.$linkid.','.$tprefix; }
                    368:             $newshowtypes='problems';
                    369:             $indent++;
                    370:             #if in a .page continue to link the encompising .page
                    371:             if (!$linkid) { $linkid=$rid; }
                    372:         }
                    373:         if (defined($rows[$sofar])) {
                    374:             $rows[$sofar].='&'.$tprefix.$rid;
                    375:         } else {
                    376:             $rows[$sofar]=$tprefix.$rid;
                    377:         }
                    378:         if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
                    379:             (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
                    380:             my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
                    381:             $sofar=&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
                    382:                                '&'.$frid.'&',$newshowtypes,$indent,$linkid);
                    383:             &addresource($hash{'src_'.$frid},\$sofar,$frid,$newshowtypes,
                    384:                          $indent,$linkid);
                    385:             if ($tprefix =~ /j$/) { $indent--; $linkid=''; }
                    386:         }
1.31      albertel  387:     } else {
1.51      bowersj2  388:         &addresource($hash{'src_'.$rid},\$sofar,$rid,$showtypes,
                    389:                      $indent,$linkid);
1.31      albertel  390:     }
                    391: 
                    392:     if (defined($hash{'to_'.$rid})) {
1.51      bowersj2  393:         $further=&followlinks($rid,$sofar,$beenhere,$further,$showtypes,
                    394:                               $indent,$linkid);
1.2       www       395:     }
1.31      albertel  396: 
1.2       www       397:     return $further;
                    398: }
                    399: 
                    400: # ================================================================ Main Handler
1.1       www       401: 
                    402: sub handler {
1.28      albertel  403:     my $r=shift;
1.2       www       404: 
1.51      bowersj2  405:     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
                    406: 
                    407:     if ($ENV{'form.jtest'} ne "1")
                    408:     {
                    409:         return new_handle($r);
                    410:     }
1.2       www       411: 
                    412: # ------------------------------------------- Set document type for header only
                    413: 
1.28      albertel  414:     if ($r->header_only) {
1.51      bowersj2  415:         if ($ENV{'browser.mathml'}) {
                    416:             $r->content_type('text/xml');
                    417:         } else {
                    418:             $r->content_type('text/html');
                    419:         }
                    420:         $r->send_http_header;
                    421:         return OK;
1.28      albertel  422:     }
                    423:     my $requrl=$r->uri;
                    424:     my $hashtied;
1.2       www       425: # ----------------------------------------------------------------- Tie db file
1.28      albertel  426:     my $fn;
                    427:     if ($ENV{'request.course.fn'}) {
1.51      bowersj2  428:         $fn=$ENV{'request.course.fn'};
                    429:         if (-e "$fn.db") {
                    430:             if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) &&
                    431:                 (tie(%parmhash,'GDBM_File',
                    432:                      $ENV{'request.course.fn'}.'_parms.db',
                    433:                      &GDBM_READER(),0640))) {
                    434:                 $hashtied=1;
                    435:             }
                    436:         }
1.28      albertel  437:     }
                    438:     if (!$hashtied) {
1.51      bowersj2  439:         $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
                    440:         return HTTP_NOT_ACCEPTABLE; 
1.28      albertel  441:     }
                    442: 
1.2       www       443: # ------------------------------------------------------------------- Hash tied
1.28      albertel  444: 
                    445:     if ($ENV{'browser.mathml'}) {
1.51      bowersj2  446:         $r->content_type('text/xml');
1.28      albertel  447:     } else {
1.51      bowersj2  448:         $r->content_type('text/html');
1.28      albertel  449:     }
                    450:     &Apache::loncommon::no_cache($r);
                    451:     $r->send_http_header;
                    452: 
1.42      www       453:     my $firstres=$hash{'map_start_'.
                    454:            &Apache::lonnet::clutter($ENV{'request.course.uri'})};
                    455:     my $lastres=$hash{'map_finish_'.
                    456:            &Apache::lonnet::clutter($ENV{'request.course.uri'})};
1.28      albertel  457:     if (!(($firstres) && ($lastres))) {
1.51      bowersj2  458:         $r->print('<html><body>Coursemap undefined.</body></html>');
1.28      albertel  459:     } else {
                    460: 
1.2       www       461: # ----------------------------------------------------------------- Render page
1.10      www       462: # -------------------------------------------------------------- Set parameters
                    463: 
                    464: 
                    465: # ---------------------------- initialize coursedata and userdata for this user
1.51      bowersj2  466:         undef %courseopt;
                    467:         undef %useropt;
1.10      www       468: 
1.51      bowersj2  469:         my $uname=$ENV{'user.name'};
                    470:         my $udom=$ENV{'user.domain'};
                    471:         my $uhome=$ENV{'user.home'};
                    472:         my $cid=$ENV{'request.course.id'};
                    473:         my $chome=$ENV{'course.'.$cid.'.home'};
                    474:         my ($cdom,$cnum)=split(/\_/,$cid);
                    475: 
                    476:         my $userprefix=$uname.'_'.$udom.'_';
                    477:         
                    478:         unless ($uhome eq 'no_host') { 
1.48      bowersj2  479: # ------------------------------------------------- Get coursedata (if present)
1.51      bowersj2  480:             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                    481:                 my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                    482:                                                  ':resourcedata',$chome);
                    483:                 if ($reply!~/^error\:/) {
                    484:                     $courserdatas{$cid}=$reply;
                    485:                     $courserdatas{$cid.'.last_cache'}=time;
                    486:                 }
                    487:                 # check to see if network failed
                    488:                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                    489:                 {
                    490:                     $networkFailedFlag = 1;
                    491:                 }
                    492:             }
                    493:             foreach (split(/\&/,$courserdatas{$cid})) {
                    494:                 my ($name,$value)=split(/\=/,$_);
                    495:                 $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
                    496:                     &Apache::lonnet::unescape($value);
                    497:             }
1.10      www       498: # --------------------------------------------------- Get userdata (if present)
1.51      bowersj2  499:             unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
                    500:                 my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
                    501:                 if ($reply!~/^error\:/) {
                    502:                     $userrdatas{$uname.'___'.$udom}=$reply;
                    503:                     $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
                    504:                 }
                    505:             }
                    506:             foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
                    507:                 my ($name,$value)=split(/\=/,$_);
                    508:                 $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
                    509:                     &Apache::lonnet::unescape($value);
                    510:             }
                    511:         }
1.28      albertel  512: 
1.51      bowersj2  513:         @rows=();
1.28      albertel  514: 
1.51      bowersj2  515:         &tracetable(0,$firstres,'&','',0);
1.2       www       516: 
                    517: # ------------------------------------------------------------------ Page parms
                    518: 
1.51      bowersj2  519:         my $j;
                    520:         my $i;
                    521:         my $lcm=1;
                    522:         my $contents=0;
1.2       www       523: 
                    524: # ---------------------------------------------- Go through table to get layout
                    525: 
1.51      bowersj2  526:         for ($i=0;$i<=$#rows;$i++) {
                    527:             if ($rows[$i]) {
                    528:                 &Apache::lonxml::debug("Row $i is:".$rows[$i]);
                    529:                 $contents++;
                    530:                 my @colcont=split(/\&/,$rows[$i]);
                    531:                 $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
                    532:             } 
                    533:         }
1.5       www       534: 
1.2       www       535: 
1.51      bowersj2  536:         unless ($contents) {
                    537:             $r->print('<html><body>Empty Map.</body></html>');
                    538:         } else {
1.10      www       539: 
1.2       www       540: # ------------------------------------------------------------------ Build page
                    541: 
1.51      bowersj2  542:             my $currenturl=$ENV{'form.postdata'};
                    543:             $currenturl=~s/^http\:\/\///;
                    544:             $currenturl=~s/^[^\/]+//;
1.13      www       545: 
1.2       www       546: # ---------------------------------------------------------------- Send headers
                    547: 
1.51      bowersj2  548:             my $date=localtime;
                    549:             my $now=time;
1.21      www       550: # ----------------------------------------- Get email status and discussiontime
                    551: 
1.51      bowersj2  552:             my %emailstatus=&Apache::lonnet::dump('email_status');
                    553:             my $logouttime=$emailstatus{'logout'};
                    554:             my $courseleave=$emailstatus{'logout_'.$ENV{'request.course.id'}};
                    555:             my $lastcheck=($courseleave>$logouttime?$courseleave:$logouttime);
                    556: 
                    557:             my %discussiontimes=&Apache::lonnet::dump('discussiontimes',
                    558:                                                           $cdom,$cnum);
                    559: 
                    560:             my %feedback=();
                    561:             my %error=();
                    562:             foreach my $msgid (split(/\&/,&Apache::lonnet::reply('keys:'.
                    563:                                                                  $ENV{'user.domain'}.':'.
                    564:                                                                  $ENV{'user.name'}.':nohist_email',
                    565:                                                                  $ENV{'user.home'}))) {
                    566:                 $msgid=&Apache::lonnet::unescape($msgid);
                    567:                 my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
                    568:                 if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
                    569:                     my ($what,$url)=($1,$2);
                    570:                     my %status=
                    571:                         &Apache::lonnet::get('email_status',[$msgid]);
                    572:                     if ($status{$msgid}=~/^error\:/) { 
                    573:                         $status{$msgid}=''; 
                    574:                     }
                    575:                         
                    576:                     if (($status{$msgid} eq 'new') || 
                    577:                         (!$status{$msgid})) { 
                    578:                         if ($what eq 'Error') {
                    579:                             $error{$url}.=','.$msgid; 
                    580:                         } else {
                    581:                             $feedback{$url}.=','.$msgid;
                    582:                         }
                    583:                     }
                    584:                 }
                    585:             }
1.22      www       586: # ----------------------------------------------------------- Start Page Output
1.43      www       587:             my $bodytagadd='';
1.51      bowersj2  588:             $r->print(
1.43      www       589:                    '<html><head><title>Navigate Course Map</title></head>');
1.51      bowersj2  590:             if (($currenturl=~/^\/res/) &&
                    591:                 ($currenturl!~/^\/res\/adm/)) {
                    592:                 $bodytagadd='onLoad="window.location.hash='."'curloc'".'"';
                    593:             }
                    594:             $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
1.43      www       595:                                                   $bodytagadd));
1.51      bowersj2  596:             $r->print('<script>window.focus();</script>');
                    597:             my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
                    598:             if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }
                    599:             $r->print("<h3>$date</h3>\n");
                    600:             $r->rflush();
                    601:             $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.
                    602:                       localtime($lastcheck).
                    603:                       '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'); 
                    604:             if (($currenturl=~/^\/res/) &&
                    605:                 ($currenturl!~/^\/res\/adm/)) {
                    606:                 $r->print('<a href="#curloc">Current Location</a><p>');
                    607:             }
                    608: 
                    609:             # Handle a network error
                    610: 
                    611:             if ($networkFailedFlag)
                    612:             {
                    613:                 $r->print('<H2>LON-CAPA network failure.</H2>'."\n");
                    614:                 $r->print("<p>LON-CAPA's network is having difficulties, some problem" .
                    615:                           " information, such as due dates, will not be available.");
                    616:             }
1.13      www       617: # ----------------------------------------------------- The little content list
1.51      bowersj2  618:             for ($i=0;$i<=$#rows;$i++) {
                    619:                 if ($rows[$i]) {
                    620:                     my @colcont=split(/\&/,$rows[$i]);
                    621:                     my $avespan=$lcm/($#colcont+1);
                    622:                     for ($j=0;$j<=$#colcont;$j++) {
                    623:                         my $rid=$colcont[$j];
                    624:                         if ($rid=~/^h(.+)/) {
                    625:                             $rid=$1;
                    626:                             $r->print('&nbsp;&nbsp;&nbsp;<a href="#'.
                    627:                                       $rid.'">'.$hash{'title_'.$rid}.
                    628:                                       '</a><br>');
                    629:                         }
                    630:                     }
                    631:                 }
                    632:             }
1.2       www       633: # ----------------------------------------------------------------- Start table
1.51      bowersj2  634:             $r->print('<hr><table cols="'.$lcm.'" border="0">');
                    635:             for ($i=0;$i<=$#rows;$i++) {
                    636:                 if ($rows[$i]) {
                    637:                     $r->print("\n<tr>");
                    638:                     my @colcont=split(/\&/,$rows[$i]);
                    639:                     my $avespan=$lcm/($#colcont+1);
                    640: 
                    641:                     # for each item I wish to print on this row...
                    642:                     for ($j=0;$j<=$#colcont;$j++) {
                    643:                         my $indent;my $indentstr;
                    644:                         my $linkid;
                    645:                         my $rid=$colcont[$j];
1.36      www       646:                         $rid=~/(\d+)\.(\d+)$/;
1.51      bowersj2  647:                         my $src=
                    648:                            &Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
                    649:                         my $symb=
                    650:           &Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.$src;
                    651:                         my $add='<td>';
                    652:                         my $adde='</td>';
                    653:                         my $hwk='<font color="#223322">';
                    654:                         my $hwke='</font>';
                    655:                         if ($rid=~/^l(\d+\.\d+),(.+)/) { $linkid=$1; $rid=$2; }
                    656:                         if ($rid=~/^i(\d+),(.+)/) { $indent=$1; $rid=$2; }
                    657:                         if ($rid=~/^h(.+)/) {
                    658:                             $rid=$1;
                    659:                             $add='<th bgcolor="#AAFF55"><a name="'.$rid.'">';
                    660:                             $adde='</th>';
1.36      www       661:                             if (($ENV{'user.adv'}) && 
1.51      bowersj2  662:                                 ($parmhash{$symb.'.0.parameter_randompick'})) {
1.36      www       663:                                $adde=' (randomly select '.
1.51      bowersj2  664:                                    $parmhash{$symb.'.0.parameter_randompick'}.
1.36      www       665:                                    ')</th>';
                    666:                             }
1.51      bowersj2  667:                         }
                    668:                         if ($rid=~/^j(.+)/) { $rid=$1; }
                    669:                         if ($rid=~/^p(\d)(\d)\"([\w\: \(\)\/\,]*)\"(.+)/) {
                    670:                             # sub astatus describes what code/tcode mean
                    671:                             my $code=$1;
                    672:                             my $tcode=$2;
                    673:                             my $ctext=$3;
                    674:                             $rid=$4;
                    675:                             
                    676:                             # will open later
                    677:                             if ($tcode eq '1') { 
                    678:                                 $add='<td bgcolor="#AAAAAA">';
                    679:                             }
                    680: 
                    681:                             # solved/correct
                    682:                             if ($code eq '3') {
                    683:                                 $add='<td bgcolor="#AAFFAA">';
                    684:                             } elsif ($code eq '4') { # partially correct
                    685:                                 $add='<td bgcolor="#E0FFAA">';
                    686:                             } else {
                    687:                                 # not attempted
                    688:                                 
                    689:                                 # we end up here on network failure, so pick a neutral
                    690:                                 # color if the network failed instead of bright red.
                    691:                                 if ( $networkFailedFlag )
                    692:                                 {
                    693:                                     $add = '<td bgcolor="#AAAAAA">';
                    694:                                 }
                    695:                                 else
                    696:                                 {
                    697:                                     $add='<td bgcolor="#FFAAAA">';
                    698:                                 }
                    699: 
                    700:                                 if ($tcode eq '2') { # open, not past due
                    701:                                     $add='<td bgcolor="#FFFFAA">';
                    702:                                 }
                    703: 
                    704:                                 if ($tcode eq '4') { # due in next 24 hours
                    705:                                     $add='<td bgcolor="#FFFF33">';
                    706:                                     $adde='</td>';
                    707:                                 }
                    708:                             }
                    709:                             $hwk='<font color="#888811"><b>';
                    710:                             $hwke='</b></font>';
                    711:                             if ($code eq '1') {
                    712:                                 $hwke='</b> ('.$ctext.')</font>';
                    713:                             }
                    714:                             if ($code eq '2' || $code eq '4') {
                    715:                                 $hwk='<font color="#992222"><b>';
                    716:                                 $hwke='</b> ('.$ctext.')</font>';
                    717:                             }
                    718:                             if ($code eq '3') {
                    719:                                 $hwk='<font color="#229922"><b>';
                    720:                                 $hwke='</b> ('.$ctext.')</font>';
                    721:                             }
                    722:                             if ($networkFailedFlag) 
                    723:                             {
                    724:                                 $hwke='</b> (status unavailable)</font>';
                    725:                             }
                    726:                         }
                    727:                         if ($rid && $hash{'src_'.$rid} eq $currenturl) {
                    728:                             $add=$add.'<a name="curloc"></a>'.
                    729:                                 '<font color=red size=+2><b>&gt; </b></font>';
                    730:                             $adde=
                    731:                                 '<font color=red size=+2><b> &lt;</b></font>'.$adde;
                    732:                         }
                    733:                         if ($discussiontimes{$symb}>$lastcheck) {
                    734:                             $adde=
                    735:                                 '<img border=0 src="/adm/lonMisc/chat.gif">'.
                    736:                                     $adde;
                    737:                         }
                    738:                         if ($error{$src}) {
                    739:                             foreach (split(/\,/,$error{$src})) {
                    740:                                 if ($_) {
                    741:                                     $adde=
                    742:                                         '&nbsp;<a href="/adm/email?display='.
                    743:                                             &Apache::lonnet::escape($_).
                    744:                                                 '"><img src="/adm/lonMisc/bomb.gif" border=0></a>'
                    745:                                                     .$adde;
                    746:                                 }
                    747:                             }
                    748:                         }
                    749:                         if ($feedback{$src}) {
                    750:                             foreach (split(/\,/,$feedback{$src})) {
                    751:                                 if ($_) {
                    752:                                     $adde=
                    753:                                         '&nbsp;<a href="/adm/email?display='.
                    754:                                             &Apache::lonnet::escape($_).
                    755:                                                 '"><img src="/adm/lonMisc/feedback.gif" border=0></a>'
                    756:                                                     .$adde;
                    757:                                 }
                    758:                             }
                    759:                         }
                    760:                         if ($indent) {
                    761:                             my $is="&nbsp;&nbsp;";
                    762:                             for(my $i=-1;$i<$indent;$i++) { $indentstr.=$is; }
                    763:                         }
                    764:                         if (!$linkid) { $linkid=$rid; }
1.38      www       765:                         if ($hash{'randomout_'.$rid}) {
                    766:                             $adde=' <i>(hidden)</i>'.$adde;
                    767:                         }
1.51      bowersj2  768:                         $r->print($add.$indentstr);
                    769:                         if ($rid) {
                    770:                             $r->print('<a href="'.$hash{'src_'.$linkid}.
1.39      www       771:                                       (($hash{'src_'.$linkid}=~/\?/)?'&':'?').
                    772:                                       'symb='.&Apache::lonnet::escape($symb)
1.35      www       773:                                        .'">'.
1.51      bowersj2  774:                                       $hwk.$hash{'title_'.$rid}.$hwke.'</a>');
                    775:                         }
                    776:                         $r->print($adde);
                    777:                     }
                    778:                     $r->print('</tr>');
                    779:                 }
                    780:             }
                    781:             $r->print("\n</table>");
                    782:             $r->print('</body></html>');
1.2       www       783: # -------------------------------------------------------------------- End page
1.51      bowersj2  784:         }                  
1.2       www       785: # ------------------------------------------------------------- End render page
1.28      albertel  786:     }
1.2       www       787: # ------------------------------------------------------------------ Untie hash
1.28      albertel  788:     unless (untie(%hash)) {
1.51      bowersj2  789:         &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    790:                                  "Could not untie coursemap $fn (browse).</font>"); 
1.28      albertel  791:     }
                    792:     unless (untie(%parmhash)) {
1.51      bowersj2  793:         &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                    794:                                  "Could not untie parmhash (browse).</font>"); 
1.28      albertel  795:     }
                    796:     return OK;
1.2       www       797: }
1.1       www       798: 
1.51      bowersj2  799: sub new_handle {
                    800:     my $r = shift;
                    801: 
                    802:     # Handle header-only request
                    803:     if ($r->header_only) {
                    804:         if ($ENV{'browser.mathml'}) {
                    805:             $r->content_type('text/xml');
                    806:         } else {
                    807:             $r->content_type('text/html');
                    808:         }
                    809:         $r->send_http_header;
                    810:         return OK;
                    811:     }
                    812: 
                    813:     # Send header, don't cache this page
                    814:     if ($ENV{'browser.mathml'}) {
                    815:         $r->content_type('text/xml');
                    816:     } else {
                    817:         $r->content_type('text/html');
                    818:     }
                    819:     &Apache::loncommon::no_cache($r);
                    820:     $r->send_http_header;
                    821: 
                    822:     # Header
                    823:     $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
                    824:                                           ''));
                    825:     # Initialize the nav map
                    826:     my $navmap = Apache::lonnavmaps::navmap->new(
                    827:                         $ENV{"request.course.fn"}.".db",
                    828:                         $ENV{"request.course.fn"}."_parms.db", 1);
                    829: 
1.55      bowersj2  830: 
                    831:     if (!defined($navmap)) {
                    832:         my $requrl = $r->uri;
                    833:         $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized";
                    834:         return HTTP_NOT_ACCEPTABLE;
                    835:     }
                    836: 
                    837:     # Check that it's defined
                    838:     if (!($navmap->courseMapDefined())) {
                    839:         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
                    840:                   '</body></html>');
                    841:         return OK;
                    842:     }
                    843: 
1.51      bowersj2  844:     # Grab a resource object so we have access to the constants; this
                    845:     # is technically not proper, but should be harmless
                    846:     my $res = $navmap->firstResource();
                    847: 
                    848:     # Defines a status->color mapping, null string means don't color
                    849:     my %colormap = 
1.54      bowersj2  850:     ( $res->NETWORK_FAILURE        => '',
1.59      bowersj2  851:       $res->CORRECT                => '',
1.54      bowersj2  852:       $res->EXCUSED                => '#BBBBFF',
1.59      bowersj2  853:       $res->PAST_DUE_ANSWER_LATER  => '',
                    854:       $res->PAST_DUE_NO_ANSWER     => '',
                    855:       $res->ANSWER_OPEN            => '#CCFFCC',
1.54      bowersj2  856:       $res->OPEN_LATER             => '',
1.59      bowersj2  857:       $res->TRIES_LEFT             => '',
                    858:       $res->INCORRECT              => '',
                    859:       $res->OPEN                   => '',
1.54      bowersj2  860:       $res->NOTHING_SET            => ''        );
1.59      bowersj2  861:     # And a special case in the nav map; what to do when the assignment
                    862:     # is not yet done and due in less then 24 hours
                    863:     my $hurryUpColor = "#FFCCCC";
                    864: 
                    865:     my %statusIconMap = 
                    866: 	( $res->NETWORK_FAILURE    => '',
                    867: 	  $res->NOTHING_SET        => '',
                    868: 	  $res->CORRECT            => 'navmap.correct.gif',
                    869: 	  $res->EXCUSED            => 'navmap.correct.gif',
                    870: 	  $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
                    871: 	  $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
                    872: 	  $res->ANSWER_OPEN        => 'navmap.wrong.gif',
                    873: 	  $res->OPEN_LATER         => '',
                    874: 	  $res->TRIES_LEFT         => 'navmap.open.gif',
                    875: 	  $res->INCORRECT          => 'navmap.wrong.gif',
                    876: 	  $res->OPEN               => 'navmap.open.gif' );
                    877: 
                    878:     my %condenseStatuses =
                    879: 	( $res->NETWORK_FAILURE    => 1,
                    880: 	  $res->NOTHING_SET        => 1,
1.61      bowersj2  881: 	  $res->CORRECT            => 1 );
1.51      bowersj2  882: 
                    883:     my %filterHash;
                    884:     # Figure out what we're not displaying
                    885:     foreach (split(/\,/, $ENV{"form.filter"})) {
                    886:         if ($_) {
                    887:             $filterHash{$_} = "1";
                    888:         }
                    889:     }
                    890: 
                    891:     # Begin the HTML table
1.59      bowersj2  892:     # four cols: resource + indent, chat+feedback, icon, text string
1.51      bowersj2  893:     $r->print('<table cellspacing="3" cellpadding="0" bgcolor="#FFFFFF">' ."\n");
                    894: 
                    895:     my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash);
                    896:     my $curRes = $mapIterator->next();
1.53      bowersj2  897:     undef $res; # so we don't accidentally use it later
1.51      bowersj2  898:     my $indentLevel = -1;
1.61      bowersj2  899:     my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
1.51      bowersj2  900: 
                    901:     my $isNewBranch = 0;
1.59      bowersj2  902:     my $now = time();
                    903:     my $in24Hours = $now + 24 * 60 * 60;
1.51      bowersj2  904: 
                    905:     while ($curRes != $mapIterator->END_NAV_MAP) {
                    906:         if ($curRes == $mapIterator->BEGIN_MAP() ||
1.52      bowersj2  907:             $curRes == $mapIterator->BEGIN_BRANCH()) {
1.51      bowersj2  908:             $indentLevel++;
                    909:         }
                    910:         if ($curRes == $mapIterator->END_MAP() ||
1.52      bowersj2  911:             $curRes == $mapIterator->END_BRANCH()) {
1.51      bowersj2  912:             $indentLevel--;
                    913:         }
1.52      bowersj2  914:         if ($curRes == $mapIterator->BEGIN_BRANCH()) {
                    915:             $isNewBranch = 1;
1.51      bowersj2  916:         }
                    917: 
                    918:         if (ref($curRes) && $curRes->src()) {
                    919: 
1.59      bowersj2  920: 	    # Step one: Decide which parts to show
1.61      bowersj2  921: 	    my @parts = @{$curRes->parts()};
                    922: 	    my $multipart = scalar(@parts) > 1;
                    923: 	    my $condensed = 0;
                    924: 		
1.51      bowersj2  925:             if ($curRes->is_problem()) {
1.59      bowersj2  926: 		# Is it multipart?
                    927: 
                    928: 		if ($multipart) {
                    929: 		    # If it's multipart, see if part 0 is "open"
                    930: 		    # if it is, display all parts, if it isn't,
                    931: 		    # just display first
                    932: 		    if (!$curRes->opendate("0")) {
                    933: 			@parts = ("0"); # just display the zero-th part
                    934: 		    } else {
                    935: 			# Otherwise, only display part 0 if we want to 
                    936: 			# attach feedback or email information to it
1.61      bowersj2  937: 			if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
1.59      bowersj2  938: 			    shift @parts;
                    939: 			} else {
                    940: 			    # If there's discussion or feedback, that counts
                    941: 			    # as a difference, so display the parts.
                    942: 			    
                    943: 			    # Now, we decide whether to condense the
                    944: 			    # parts due to similarity
1.61      bowersj2  945: 			    my $status = $curRes->status($parts[1]);
                    946: 			    my $due = $curRes->duedate($parts[1]);
1.62    ! bowersj2  947: 			    my $open = $curRes->opendate($parts[1]);
1.61      bowersj2  948: 			    my $statusAllSame = 1;
                    949: 			    my $dueAllSame = 1;
                    950: 			    my $openAllSame = 1;
                    951: 			    for (my $i = 2; $i < scalar(@parts); $i++) {
1.59      bowersj2  952: 				if ($curRes->status($parts[$i]) != $status){
1.61      bowersj2  953: 				    $statusAllSame = 0;
                    954: 				}
                    955: 				if ($curRes->duedate($parts[$i]) != $due ) {
                    956: 				    $dueAllSame = 0;
                    957: 				}
                    958: 				if ($curRes->opendate($parts[$i]) != $open) {
                    959: 				    $openAllSame = 0;
1.59      bowersj2  960: 				}
                    961: 			    }
                    962: 			    
                    963: 			    # $allSame is true if all the statuses were
                    964: 			    # the same. Now, if they are all the same and
1.61      bowersj2  965: 			    # match one of the statuses to condense, or they
                    966: 			    # are all open with the same due date, or they are
                    967: 			    # all OPEN_LATER with the same open date, display the
                    968: 			    # status of the first non-zero part (to get the 'correct'
                    969: 			    # status right, since 0 is never 'correct' or 'open').
                    970: 			    if (($statusAllSame && defined($condenseStatuses{$status})) ||
                    971: 				($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                    972: 				($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
                    973: 				@parts = ($parts[1]);
                    974: 				$condensed = 1;
1.59      bowersj2  975: 			    }
                    976: 			}
                    977: 		    }
                    978: 		}
                    979: 
1.51      bowersj2  980:             } else {
                    981:                 @parts[0] = "0"; # this is to get past foreach loop below
                    982:                  # you can consider a non-problem resource as a resource
                    983:                  # with only one part without loss
                    984:             }
                    985: 
1.59      bowersj2  986: 	    # Step two: Show the parts
1.51      bowersj2  987:             foreach my $part (@parts) {
1.59      bowersj2  988: 
                    989: 		my $deltalevel = 0; # for inserting the branch icon
1.51      bowersj2  990:                 
                    991:                 # For each thing we're displaying...
                    992: 
                    993:                 my $stack = $mapIterator->getStack();
                    994:                 my $src = getLinkForResource($stack);
                    995: 
                    996:                 my $srcHasQuestion = $src =~ /\?/;
                    997:                 my $link = $src.
                    998:                     ($srcHasQuestion?'&':'?') .
                    999:                     'symb='.&Apache::lonnet::escape($curRes->symb()).
                   1000:                     '"';
                   1001:                 my $title = $curRes->title();
                   1002:                 my $partLabel = "";
1.52      bowersj2 1003:                 my $newBranchText = "";
                   1004: 
                   1005:                 # If this is a new branch, label it so
                   1006:                 # (temporary, this should be an icon w/ alt text)
                   1007:                 if ($isNewBranch) {
1.59      bowersj2 1008:                     $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
1.52      bowersj2 1009:                     $isNewBranch = 0;
1.59      bowersj2 1010: 		    $deltalevel = 1;
1.52      bowersj2 1011:                 }
1.51      bowersj2 1012: 
                   1013:                 # links to open and close the folders
                   1014:                 my $linkopen = "<a href=\"$link\">";
                   1015:                 my $linkclose = "</a>";
                   1016: 
1.61      bowersj2 1017:                 my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
1.51      bowersj2 1018:                 if ($curRes->is_problem()) { 
1.61      bowersj2 1019: 		    if ($part eq "0" || $condensed) {
                   1020: 			$icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />'; 
                   1021: 		    } else {
                   1022: 			$icon = $indentString;
                   1023: 		    }
1.51      bowersj2 1024:                 }
                   1025: 
                   1026:                 # Display the correct icon, link to open or shut map
                   1027:                 if ($curRes->is_map()) { 
                   1028:                     my $mapId = $curRes->map_pc();
                   1029:                     my $nowOpen = !defined($filterHash{$mapId});
                   1030:                     $icon = $nowOpen ?
                   1031:                         "folder_opened.gif" : "folder_closed.gif";
1.61      bowersj2 1032: 		    $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
1.52      bowersj2 1033:                     $linkopen = "<a href=\"/adm/navmaps?filter=";
1.51      bowersj2 1034:                     $linkopen .= $nowOpen ? 
                   1035:                         addToFilter(\%filterHash, $mapId) :
                   1036:                         removeFromFilter(\%filterHash, $mapId);
                   1037:                     $linkopen .= "\">";
                   1038:                     $linkclose = "</a>";
                   1039:                     
                   1040:                 }
                   1041:                 
                   1042:                 my $colorizer = "";
                   1043:                 if ($curRes->is_problem()) {
                   1044:                     my $status = $curRes->status($part);
                   1045:                     my $color = $colormap{$status};
                   1046:                     if ($color ne "") {
                   1047:                         $colorizer = "bgcolor=\"$color\"";
                   1048:                     }
                   1049:                 }
                   1050: 
1.59      bowersj2 1051: 		# FIRST ROW: The resource indentation, branch icon, and name
1.51      bowersj2 1052:                 $r->print("  <tr><td align=\"left\" valign=\"top\">\n");
                   1053: 
                   1054:                 # print indentation
1.59      bowersj2 1055:                 for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {
1.51      bowersj2 1056:                     $r->print($indentString);
                   1057:                 }
                   1058: 
1.61      bowersj2 1059:                 $r->print("  ${newBranchText}${linkopen}$icon${linkclose}\n");
1.51      bowersj2 1060: 
1.61      bowersj2 1061:                 if ($curRes->is_problem() && $part != "0" && !$condensed) { 
                   1062: 		    $partLabel = " (Part $part)"; 
                   1063: 		    $title = "";
                   1064: 		}
1.51      bowersj2 1065: 
1.59      bowersj2 1066:                 $r->print("  <a href=\"$link\">$title$partLabel</a></td>");
                   1067: 
                   1068: 		my $discussionHTML = ""; my $feedbackHTML = "";
                   1069: 
                   1070: 		# SECOND ROW: Is there text or feedback?
                   1071: 		if ($curRes->hasDiscussion()) {
                   1072: 		    $discussionHTML = $linkopen .
                   1073: 			'<img border="0" src="/adm/lonMisc/chat.gif" />' .
                   1074: 			$linkclose;
                   1075: 		}
                   1076: 
                   1077: 		if ($curRes->getFeedback()) {
                   1078: 		    my $feedback = $curRes->getFeedback();
                   1079: 		    foreach (split(/\,/, $feedback)) {
                   1080: 			if ($_) {
                   1081: 			    $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
                   1082: 				. &Apache::lonnet::escape($_) . '">'
                   1083: 				. '<img src="/adm/lonMisc/feedback.gif" '
                   1084: 				. 'border="0" /></a>';
                   1085: 			}
                   1086: 		    }
                   1087: 		}
                   1088: 
                   1089: 		$r->print("<td align=\"left\">$discussionHTML$feedbackHTML</td>");
                   1090: 
1.61      bowersj2 1091: 		# Is this the first displayed part of a multi-part problem
                   1092: 		# that has not been condensed, so we should suppress these two
                   1093: 		# columns?
                   1094: 		my $firstDisplayed = !$condensed && $multipart && $part eq "0";
                   1095: 
1.59      bowersj2 1096: 		# THIRD ROW: Problem status icon
1.61      bowersj2 1097: 		if ($curRes->is_problem() &&
                   1098: 		    !$firstDisplayed) {
                   1099: 		    my $icon = $statusIconMap{$curRes->status($part)};
1.59      bowersj2 1100: 		    if ($icon) {
                   1101: 			$r->print("<td width=\"50\" align=\"right\">$linkopen<img src=\"/adm/lonIcons/$icon\" border=\"0\" />$linkclose</td>\n");
                   1102: 		    } else {
                   1103: 			$r->print("<td></td>\n");
                   1104: 		    }
                   1105: 		} else { # not problem, no icon
                   1106: 		    $r->print("<td></td>\n");
                   1107: 		}
                   1108: 
                   1109:  		# FOURTH ROW: Text description
                   1110: 		$r->print("<td $colorizer align=\"right\">\n");
1.51      bowersj2 1111:                 
1.61      bowersj2 1112:                 if ($curRes->kind() eq "res" &&
                   1113:                     $curRes->is_problem() &&
                   1114: 		    !$firstDisplayed) {
1.53      bowersj2 1115:                     $r->print (getDescription($curRes, $part));
1.51      bowersj2 1116:                 }
1.59      bowersj2 1117: 
                   1118: 		$r->print("</td></tr>\n");
1.51      bowersj2 1119:             }
                   1120:         }
                   1121:         $curRes = $mapIterator->next();
                   1122:     }
                   1123: 
                   1124:     $r->print("</table></body></html>");
                   1125: 
1.59      bowersj2 1126:     $navmap->untieHashes();
                   1127: 
1.51      bowersj2 1128:     return OK;
                   1129: }
                   1130: 
                   1131: # Convenience functions: Returns a string that adds or subtracts
                   1132: # the second argument from the first hash, appropriate for the 
                   1133: # query string that determines which folders to recurse on
                   1134: sub addToFilter {
                   1135:     my $hashIn = shift;
                   1136:     my $addition = shift;
                   1137:     my %hash = %$hashIn;
                   1138:     $hash{$addition} = 1;
                   1139: 
                   1140:     return join (",", keys(%hash));
                   1141: }
                   1142: 
                   1143: sub removeFromFilter {
                   1144:     my $hashIn = shift;
                   1145:     my $subtraction = shift;
                   1146:     my %hash = %$hashIn;
                   1147: 
                   1148:     delete $hash{$subtraction};
                   1149:     return join(",", keys(%hash));
                   1150: }
                   1151: 
                   1152: # Convenience function: Given a stack returned from getStack on the iterator,
                   1153: # return the correct src() value.
                   1154: # Later, this should add an anchor when we start putting anchors in pages.
                   1155: sub getLinkForResource {
                   1156:     my $stack = shift;
                   1157:     my $res;
                   1158: 
                   1159:     # Check to see if there are any pages in the stack
                   1160:     foreach $res (@$stack) {
                   1161:         if (defined($res) && $res->is_page()) {
                   1162:             return $res->src();
                   1163:         }
                   1164:     }
                   1165: 
                   1166:     # Failing that, return the src of the last resource that is defined
                   1167:     # (when we first recurse on a map, it puts an undefined resource
                   1168:     # on the bottom because $self->{HERE} isn't defined yet, and we
                   1169:     # want the src for the map anyhow)
                   1170:     foreach (@$stack) {
                   1171:         if (defined($_)) { $res = $_; }
                   1172:     }
                   1173: 
                   1174:     return $res->src();
                   1175: }
                   1176: 
1.53      bowersj2 1177: # Convenience function: This seperates the logic of how to create
                   1178: # the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned",
                   1179: # etc.) into a seperate function. It takes a resource object as the
                   1180: # first parameter, and the part number of the resource as the second.
                   1181: # It's basically a big switch statement on the status of the resource.
                   1182: 
                   1183: sub getDescription {
                   1184:     my $res = shift;
                   1185:     my $part = shift;
                   1186:     my $status = $res->getDateStatus();
                   1187: 
                   1188:     if ($status == $res->NETWORK_FAILURE) { return ""; }
                   1189:     if ($status == $res->NOTHING_SET) {
                   1190:         return "Not currently assigned.";
                   1191:     }
                   1192:     if ($status == $res->OPEN_LATER) {
                   1193:         return "Opens: " . timeToHumanString($res->opendate($part));
                   1194:     }
                   1195:     if ($status == $res->OPEN) {
1.59      bowersj2 1196: 	if ($res->duedate()) {
                   1197: 	    return "Due: $status " . timeToHumanString($res->duedate($part));
                   1198: 	} else {
                   1199: 	    return "Open, no due date";
                   1200: 	}
1.53      bowersj2 1201:     }
1.54      bowersj2 1202:     if ($status == $res->PAST_DUE_ANSWER_LATER) {
1.59      bowersj2 1203:         return "Answer opens: " . timeToHumanString($res->answerdate($part));
1.54      bowersj2 1204:     }
                   1205:     if ($status == $res->PAST_DUE_NO_ANSWER) {
                   1206:         return "Was Due: " . timeToHumanString($res->duedate($part));
1.53      bowersj2 1207:     }
                   1208:     if ($status == $res->ANSWER_OPEN) {
                   1209:         return "Answer available";
                   1210:     }
1.59      bowersj2 1211:     if ($status == $res->EXCUSED) {
                   1212: 	return "Excused by instructor";
                   1213:     }
                   1214:     if ($status == $res->TRIES_LEFT) {
                   1215: 	my $tries = $res->tries();
                   1216: 	my $maxtries = $res->maxtries();
                   1217: 	my $triesString = "($tries of $maxtries tries used)";
                   1218: 	if ($res->duedate()) {
                   1219: 	    return "Due: $status " . timeToHumanString($res->duedate($part)) .
                   1220: 		" $triesString";
                   1221: 	} else {
                   1222: 	    return "No due date $triesString";
                   1223: 	}
                   1224:     }
1.53      bowersj2 1225: }
                   1226: 
                   1227: # I want to change this into something more human-friendly. For
                   1228: # now, this is a simple call to localtime. The final function
                   1229: # probably belongs in loncommon.
                   1230: sub timeToHumanString {
1.58      albertel 1231:     my ($time) = @_;
                   1232:     # zero, '0' and blank are bad times
                   1233:     if ($time) {
                   1234: 	return localtime($time);
                   1235:     } else {
                   1236: 	return 'Never';
                   1237:     }
1.53      bowersj2 1238: }
                   1239: 
1.51      bowersj2 1240: 1;
                   1241: 
                   1242: package Apache::lonnavmaps::navmap;
                   1243: 
                   1244: # LEFT:
                   1245: # * Actual handler code (multi-part)
                   1246: # * Branches (aieee!) (and conditionals)
                   1247: 
                   1248: =pod
                   1249: 
                   1250: lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.
                   1251: 
                   1252: =head1 navmap object: Encapsulating the compiled nav map
                   1253: 
                   1254: navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.
                   1255: 
                   1256: Most notably it provides a way to navigate the map sensibly and a flexible iterator that makes it easy to write various renderers based on nav maps.
                   1257: 
                   1258: You must obtain resource objects through the navmap object.
                   1259: 
                   1260: =head2 Methods
                   1261: 
                   1262: =over 4
                   1263: 
1.55      bowersj2 1264: =item * B<new>(filename, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled course representation and parmHashFile. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.
1.51      bowersj2 1265: 
                   1266: =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
                   1267: 
                   1268: =cut
                   1269: 
                   1270: use strict;
                   1271: use GDBM_File;
                   1272: 
                   1273: sub new {
                   1274:     # magic invocation to create a class instance
                   1275:     my $proto = shift;
                   1276:     my $class = ref($proto) || $proto;
                   1277:     my $self = {};
                   1278: 
                   1279:     $self->{NAV_HASH_FILE} = shift;
                   1280:     $self->{PARM_HASH_FILE} = shift;
                   1281:     $self->{GENERATE_COURSE_USER_OPT} = shift;
1.55      bowersj2 1282:     $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;
1.51      bowersj2 1283: 
                   1284:     # Resource cache stores navmapresource's as we reference them. We generate
                   1285:     # them on-demand so we don't pay for creating resources unless we use them.
                   1286:     $self->{RESOURCE_CACHE} = {};
                   1287: 
                   1288:     # Network failure flag, if we accessed the course or user opt and
                   1289:     # failed
                   1290:     $self->{NETWORK_FAILURE} = 0;
                   1291: 
                   1292:     # tie the nav hash
                   1293:     my %navmaphash;
                   1294:     if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
                   1295:               &GDBM_READER(), 0640))) {
                   1296:         return undef;
                   1297:     }
                   1298:     $self->{NAV_HASH} = \%navmaphash;
                   1299:     
                   1300:     my %parmhash;
                   1301:     if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
                   1302:               &GDBM_READER(), 0640)))
                   1303:     {
1.60      bowersj2 1304: 	untie $self->{PARM_HASH};
1.51      bowersj2 1305:         return undef;
                   1306:     }
                   1307:     $self->{PARM_HASH} = \%parmhash;
                   1308:     $self->{HASH_TIED} = 1;
                   1309: 
                   1310:     # If the course opt hash and the user opt hash should be generated,
                   1311:     # generate them
                   1312:     if ($self->{GENERATE_COURSE_USER_OPT}) {
                   1313:         my $uname=$ENV{'user.name'};
                   1314:         my $udom=$ENV{'user.domain'};
                   1315:         my $uhome=$ENV{'user.home'};
                   1316:         my $cid=$ENV{'request.course.id'};
                   1317:         my $chome=$ENV{'course.'.$cid.'.home'};
                   1318:         my ($cdom,$cnum)=split(/\_/,$cid);
                   1319:         
                   1320:         my $userprefix=$uname.'_'.$udom.'_';
                   1321:         
                   1322:         my %courserdatas; my %useropt; my %courseopt;
                   1323:         unless ($uhome eq 'no_host') { 
                   1324: # ------------------------------------------------- Get coursedata (if present)
                   1325:             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                   1326:                 my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                   1327:                                                  ':resourcedata',$chome);
                   1328:                 if ($reply!~/^error\:/) {
                   1329:                     $courserdatas{$cid}=$reply;
                   1330:                     $courserdatas{$cid.'.last_cache'}=time;
                   1331:                 }
                   1332:                 # check to see if network failed
                   1333:                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                   1334:                 {
                   1335:                     $self->{NETWORK_FAILURE} = 1;
                   1336:                 }
                   1337:             }
                   1338:             foreach (split(/\&/,$courserdatas{$cid})) {
                   1339:                 my ($name,$value)=split(/\=/,$_);
                   1340:                 $courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
                   1341:                     &Apache::lonnet::unescape($value);
                   1342:             }
                   1343: # --------------------------------------------------- Get userdata (if present)
                   1344:             unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
                   1345:                 my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
                   1346:                 if ($reply!~/^error\:/) {
                   1347:                     $userrdatas{$uname.'___'.$udom}=$reply;
                   1348:                     $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
                   1349:                 }
                   1350:                 # check to see if network failed
                   1351:                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )
                   1352:                 {
                   1353:                     $self->{NETWORK_FAILURE} = 1;
                   1354:                 }
                   1355:             }
                   1356:             foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
                   1357:                 my ($name,$value)=split(/\=/,$_);
                   1358:                 $useropt{$userprefix.&Apache::lonnet::unescape($name)}=
                   1359:                     &Apache::lonnet::unescape($value);
                   1360:             }
1.55      bowersj2 1361:             $self->{COURSE_OPT} = \%courseopt;
                   1362:             $self->{USER_OPT} = \%useropt;
1.51      bowersj2 1363:         }
                   1364:     }   
                   1365: 
1.55      bowersj2 1366:     if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) {
                   1367:         my $cid=$ENV{'request.course.id'};
                   1368:         my ($cdom,$cnum)=split(/\_/,$cid);
                   1369:         
                   1370:         my %emailstatus = &Apache::lonnet::dump('email_status');
1.56      bowersj2 1371:         my $logoutTime = $emailstatus{'logout'};
                   1372:         my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
1.55      bowersj2 1373:         $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?
                   1374:                                $courseLeaveTime : $logoutTime);
1.56      bowersj2 1375:         my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
1.55      bowersj2 1376:                                                    $cdom, $cnum);
                   1377:         my %feedback=();
                   1378:         my %error=();
                   1379:         my $keys = &Apache::lonnet::reply('keys:'.
                   1380:                                           $ENV{'user.domain'}.':'.
                   1381:                                           $ENV{'user.name'}.':nohist_email',
                   1382:                                           $ENV{'user.home'});
                   1383: 
                   1384:         foreach my $msgid (split(/\&/, $keys)) {
                   1385:             $msgid=&Apache::lonnet::unescape($msgid);
                   1386:             my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
                   1387:             if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
                   1388:                 my ($what,$url)=($1,$2);
                   1389:                 my %status=
                   1390:                     &Apache::lonnet::get('email_status',[$msgid]);
                   1391:                 if ($status{$msgid}=~/^error\:/) { 
                   1392:                     $status{$msgid}=''; 
                   1393:                 }
                   1394:                 
                   1395:                 if (($status{$msgid} eq 'new') || 
                   1396:                     (!$status{$msgid})) { 
                   1397:                     if ($what eq 'Error') {
                   1398:                         $error{$url}.=','.$msgid; 
                   1399:                     } else {
                   1400:                         $feedback{$url}.=','.$msgid;
                   1401:                     }
                   1402:                 }
                   1403:             }
                   1404:         }
                   1405:         
                   1406:         $self->{FEEDBACK} = \%feedback;
                   1407:         $self->{ERROR_MSG} = \%error; # what is this? JB
                   1408:         $self->{DISCUSSION_TIME} = \%discussiontime;
                   1409:         $self->{EMAIL_STATUS} = \%emailstatus;
                   1410:         
                   1411:     }    
                   1412:     
1.51      bowersj2 1413:     bless($self);
1.55      bowersj2 1414:         
                   1415:     return $self;
                   1416: }
1.51      bowersj2 1417: 
1.55      bowersj2 1418: # Checks to see if coursemap is defined, matching test in old lonnavmaps
                   1419: sub courseMapDefined {
                   1420:     my $self = shift;
                   1421:     my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'});
                   1422: 
1.56      bowersj2 1423:     my $firstres = $self->{NAV_HASH}->{"map_start_$uri"};
                   1424:     my $lastres = $self->{NAV_HASH}->{"map_finish_$uri"};
1.55      bowersj2 1425:     return $firstres && $lastres;
1.51      bowersj2 1426: }
                   1427: 
                   1428: sub getIterator {
                   1429:     my $self = shift;
                   1430:     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
                   1431:                                                      shift, shift);
                   1432:     return $iterator;
                   1433: }
                   1434: 
                   1435: # unties the hash when done
                   1436: sub untieHashes {
                   1437:     my $self = shift;
1.60      bowersj2 1438:     untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
                   1439:     untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
1.51      bowersj2 1440:     $self->{HASH_TIED} = 0;
                   1441: }
                   1442: 
                   1443: # when the object is destroyed, be sure to untie all the hashes we tied.
                   1444: sub DESTROY {
                   1445:     my $self = shift;
                   1446:     $self->untieHashes();
                   1447: }
                   1448: 
1.59      bowersj2 1449: # Private function: Does the given resource (as a symb string) have
                   1450: # current discussion? Returns 0 if chat/mail data not extracted.
                   1451: sub hasDiscussion {
                   1452:     my $self = shift;
                   1453:     my $symb = shift;
                   1454:     if (!defined($self->{DISCUSSION_TIME})) { return 0; }
                   1455: 
                   1456:     return $self->{DISCUSSION_TIME}->{$symb} >
                   1457: 	   $self->{LAST_CHECK};
                   1458: }
                   1459: 
                   1460: # Private function: Does the given resource (as a symb string) have
                   1461: # current feedback? Returns the string in the feedback hash, which
                   1462: # will be false if it does not exist.
                   1463: sub getFeedback { 
                   1464:     my $self = shift;
                   1465:     my $symb = shift;
                   1466: 
                   1467:     if (!defined($self->{FEEDBACK})) { return ""; }
                   1468:     
                   1469:     return $self->{FEEDBACK}->{$symb};
                   1470: }
                   1471: 
1.51      bowersj2 1472: =pod
                   1473: 
                   1474: =item * B<getById>(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object.
                   1475: 
                   1476: =cut
                   1477: 
                   1478: # The strategy here is to cache the resource objects, and only construct them
                   1479: # as we use them. The real point is to prevent reading any more from the tied
                   1480: # hash then we have to, which should hopefully alleviate speed problems.
                   1481: # Caching is just an incidental detail I throw in because it makes sense.
                   1482: 
                   1483: sub getById {
                   1484:     my $self = shift;
                   1485:     my $id = shift;
                   1486: 
                   1487:     if (defined ($self->{RESOURCE_CACHE}->{$id}))
                   1488:     {
                   1489:         return $self->{RESOURCE_CACHE}->{$id};
                   1490:     }
                   1491: 
                   1492:     # resource handles inserting itself into cache.
                   1493:     return Apache::lonnavmaps::resource->new($self, $id);
                   1494: }
                   1495: 
                   1496: =pod
                   1497: 
                   1498: =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.
                   1499: 
                   1500: =cut
                   1501: 
                   1502: sub firstResource {
                   1503:     my $self = shift;
                   1504:     my $firstResource = $self->{NAV_HASH}->{'map_start_' .
                   1505:                      &Apache::lonnet::clutter($ENV{'request.course.uri'})};
                   1506:     return $self->getById($firstResource);
                   1507: }
                   1508: 
                   1509: =pod
                   1510: 
                   1511: =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.
                   1512: 
                   1513: =cut
                   1514: 
                   1515: sub finishResource {
                   1516:     my $self = shift;
                   1517:     my $firstResource = $self->{NAV_HASH}->{'map_finish_' .
                   1518:                      &Apache::lonnet::clutter($ENV{'request.course.uri'})};
                   1519:     return $self->getById($firstResource);
                   1520: }
                   1521: 
                   1522: # -------------------------------------------- Figure out a cascading parameter
                   1523: #
                   1524: # For this function to work
                   1525: #
                   1526: # * parmhash needs to be tied
                   1527: # * courseopt and useropt need to be initialized for this user and course
                   1528: #
                   1529: 
                   1530: sub parmval {
                   1531:     my $self = shift;
                   1532:     my ($what,$symb)=@_;
                   1533:     my $cid=$ENV{'request.course.id'};
                   1534:     my $csec=$ENV{'request.course.sec'};
                   1535:     my $uname=$ENV{'user.name'};
                   1536:     my $udom=$ENV{'user.domain'};
                   1537: 
                   1538:     unless ($symb) { return ''; }
                   1539:     my $result='';
                   1540: 
                   1541:     my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);
                   1542: 
                   1543: # ----------------------------------------------------- Cascading lookup scheme
                   1544:     my $rwhat=$what;
                   1545:     $what=~s/^parameter\_//;
                   1546:     $what=~s/\_/\./;
                   1547: 
                   1548:     my $symbparm=$symb.'.'.$what;
                   1549:     my $mapparm=$mapname.'___(all).'.$what;
                   1550:     my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;
                   1551: 
                   1552:     my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
                   1553:     my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
                   1554:     my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;
                   1555: 
                   1556:     my $courselevel= $usercourseprefix.'.'.$what;
                   1557:     my $courselevelr=$usercourseprefix.'.'.$symbparm;
                   1558:     my $courselevelm=$usercourseprefix.'.'.$mapparm;
                   1559: 
                   1560:     my $useropt = $self->{USER_OPT};
                   1561:     my $courseopt = $self->{COURSE_OPT};
                   1562:     my $parmhash = $self->{PARM_HASH};
                   1563: 
                   1564: # ---------------------------------------------------------- first, check user
                   1565:     if ($uname and defined($useropt)) {
1.57      albertel 1566:         if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; }
                   1567:         if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; }
                   1568:         if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; }
1.51      bowersj2 1569:     }
                   1570: 
                   1571: # ------------------------------------------------------- second, check course
                   1572:     if ($csec and defined($courseopt)) {
1.57      albertel 1573:         if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; }
                   1574:         if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; }
                   1575:         if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; }
1.51      bowersj2 1576:     }
                   1577: 
                   1578:     if (defined($courseopt)) {
1.57      albertel 1579:         if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; }
                   1580:         if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; }
                   1581:         if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; }
1.51      bowersj2 1582:     }
                   1583: 
                   1584: # ----------------------------------------------------- third, check map parms
                   1585: 
                   1586:     my $thisparm=$$parmhash{$symbparm};
1.57      albertel 1587:     if (defined($thisparm)) { return $thisparm; }
1.51      bowersj2 1588: 
                   1589: # ----------------------------------------------------- fourth , check default
                   1590: 
                   1591:     my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
1.57      albertel 1592:     if (defined($default)) { return $default}
1.51      bowersj2 1593: 
                   1594: # --------------------------------------------------- fifth , cascade up parts
                   1595: 
                   1596:     my ($space,@qualifier)=split(/\./,$rwhat);
                   1597:     my $qualifier=join('.',@qualifier);
                   1598:     unless ($space eq '0') {
                   1599:         my ($part,$id)=split(/\_/,$space);
                   1600:         if ($id) {
                   1601:             my $partgeneral=$self->parmval($part.".$qualifier",$symb);
1.57      albertel 1602:             if (defined($partgeneral)) { return $partgeneral; }
1.51      bowersj2 1603:         } else {
                   1604:             my $resourcegeneral=$self->parmval("0.$qualifier",$symb);
1.57      albertel 1605:             if (defined($resourcegeneral)) { return $resourcegeneral; }
1.51      bowersj2 1606:         }
                   1607:     }
                   1608:     return '';
                   1609: }
                   1610: 
                   1611: 
                   1612: 1;
                   1613: 
                   1614: package Apache::lonnavmaps::iterator;
                   1615: 
                   1616: # This package must precede "navmap" because "navmap" uses it. In
                   1617: # order to keep the documentation order straight, the iterator is documented
                   1618: # after the navmap object.
                   1619: 
                   1620: =pod
                   1621: 
                   1622: =back
                   1623: 
                   1624: =head1 navmap Iterator
                   1625: 
                   1626: An I<iterator> encapsulates the logic required to traverse a data structure. navmap uses an iterator to traverse the course map according to the criteria you wish to use.
                   1627: 
                   1628: To obtain an iterator, call the B<getIterator>() function of a B<navmap> object. (Do not instantiate Apache::lonnavmaps::iterator directly.) This will return a reference to the iterator:
                   1629: 
                   1630: C<my $resourceIterator = $navmap-E<gt>getIterator();>
                   1631: 
                   1632: To get the next thing from the iterator, call B<next>:
                   1633: 
                   1634: C<my $nextThing = $resourceIterator-E<gt>next()>
                   1635: 
                   1636: getIterator behaves as follows:
                   1637: 
                   1638: =over 4
                   1639: 
                   1640: =item B<getIterator>(nav_map, firstResource, finishResource, filterHash): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). It is your responsibility to ensure that the iterator will actually get there. filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 1, then only resource that exist IN the filterHash will be recursed on. If it is a 0, only resources NOT in the filterHash will be recursed on. Defaults to 0.
                   1641: 
                   1642: Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples.
                   1643: 
                   1644: The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:
                   1645: 
                   1646: =over 4
                   1647: 
                   1648: =item * some list of tokens here
                   1649: 
                   1650: =back
                   1651: 
                   1652: The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_NAV_MAP. (Perl will automatically optimize these into constants.
                   1653: 
                   1654: =cut
                   1655: 
                   1656: # Here are the tokens for the iterator:
                   1657: 
                   1658: sub END_NAV_MAP { return 0; }  # Represents end of entire nav map
                   1659: sub BEGIN_MAP { return 1; }    # begining of a new map
                   1660: sub END_MAP { return 2; }      # end of the map
                   1661: sub BEGIN_BRANCH { return 3; } # beginning of a branch
                   1662: sub END_BRANCH { return 4; }   # end of a branch
                   1663: 
                   1664: # Params: nav map, start resource, end resource, filter, condition, 
                   1665: # already seen hash ref
                   1666: 
                   1667: sub new {
                   1668:     # magic invocation to create a class instance
                   1669:     my $proto = shift;
                   1670:     my $class = ref($proto) || $proto;
                   1671:     my $self = {};
                   1672: 
                   1673:     $self->{NAV_MAP} = shift;
                   1674:     return undef unless ($self->{NAV_MAP});
                   1675: 
                   1676:     # Handle the parameters
                   1677:     $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource();
                   1678:     $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource();
                   1679: 
                   1680:     # If the given resources are just the ID of the resource, get the
                   1681:     # objects
                   1682:     if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = 
                   1683:              $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); }
                   1684:     if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = 
                   1685:              $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); }
                   1686: 
                   1687:     $self->{FILTER} = shift;
                   1688: 
                   1689:     # A hash, used as a set, of resource already seen
                   1690:     $self->{ALREADY_SEEN} = shift;
                   1691:     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
                   1692: 
                   1693:     # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.
                   1694:     $self->{STARTED} = 0;
                   1695: 
                   1696:     # Should we continue calling the recursive iterator, if any?
                   1697:     $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   1698:     # The recursive iterator, if any
                   1699:     $self->{RECURSIVE_ITERATOR} = undef;
                   1700:     # Are we recursing on a map, or a branch?
                   1701:     $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches
                   1702:     # And the count of how deep it is, so that this iterator can keep track of
                   1703:     # when to pick back up again.
                   1704:     $self->{RECURSIVE_DEPTH} = 0;
                   1705: 
                   1706:     # For keeping track of our branches, we maintain our own stack
                   1707:     $self->{BRANCH_STACK} = [];
                   1708:     # If the size shrinks, we exhausted a branch
                   1709:     $self->{BRANCH_STACK_SIZE} = 0;
                   1710:     $self->{BRANCH_DEPTH} = 0;
                   1711: 
                   1712:     # For returning two things in a forced sequence
                   1713:     $self->{FORCE_NEXT} = undef;
                   1714: 
                   1715:     # Start with the first resource
                   1716:     push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};
                   1717:     $self->{BRANCH_STACK_SIZE} = 1;
                   1718: 
                   1719:     bless($self);
                   1720:     return $self;
                   1721: }
                   1722: 
                   1723: # Note... this function is *touchy*. I strongly recommend tracing
                   1724: # through it with the debugger a few times on a non-trivial map before
                   1725: # modifying it. Order is *everything*.
                   1726: sub next {
                   1727:     my $self = shift;
                   1728:     
                   1729:     # Iterator logic goes here
                   1730: 
                   1731:     # Is this return value pre-determined?
                   1732:     if (defined($self->{FORCE_NEXT})) {
                   1733:         my $tmp = $self->{FORCE_NEXT};
                   1734:         $self->{FORCE_NEXT} = undef;
                   1735:         return $tmp;
                   1736:     }
                   1737: 
                   1738:     # Are we using a recursive iterator? If so, pull from that and
                   1739:     # watch the depth; we want to resume our level at the correct time.
                   1740:     if ($self->{RECURSIVE_ITERATOR_FLAG})
                   1741:     {
                   1742:         # grab the next from the recursive iterator
                   1743:         my $next = $self->{RECURSIVE_ITERATOR}->next();
                   1744:         
                   1745:         # is it a begin or end map? Update depth if so
                   1746:         if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; }
                   1747:         if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; }
                   1748: 
                   1749:         # Are we back at depth 0? If so, stop recursing.
                   1750:         if ($self->{RECURSIVE_DEPTH} == 0) {
                   1751:             $self->{RECURSIVE_ITERATOR_FLAG} = 0;
                   1752:         }
                   1753:         
                   1754:         return $next;
                   1755:     }
                   1756: 
                   1757:     # Is there a current resource to grab? If not, then return
                   1758:     # END_BRANCH and END_MAP in succession.
                   1759:     if (scalar(@{$self->{BRANCH_STACK}}) == 0) {
                   1760:         if ($self->{BRANCH_DEPTH} > 0) {
                   1761:             $self->{FORCE_NEXT} = $self->END_MAP();
1.52      bowersj2 1762:             $self->{BRANCH_DEPTH}--;
1.51      bowersj2 1763:             return $self->END_BRANCH();
                   1764:         } else {
                   1765:             return $self->END_MAP();
                   1766:         }
                   1767:     }
                   1768: 
                   1769:     # Have we not yet begun? If not, return BEGIN_MAP and 
                   1770:     # remember that we've started.
                   1771:     if ( !$self->{STARTED} ) {
                   1772:         $self->{STARTED} = 1;
                   1773:         return $self->BEGIN_MAP;
                   1774:     }
                   1775: 
                   1776:     # Did the branch stack shrink since last run? If so,
                   1777:     # we exhausted a branch last time, therefore, we're about
                   1778:     # to start a new one. (We know because we already checked to see
                   1779:     # if the stack was empty.)
                   1780:     if ( scalar (@{$self->{BRANCH_STACK}}) < $self->{BRANCH_STACK_SIZE}) {
1.52      bowersj2 1781:         $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});
                   1782:         $self->{BRANCH_DEPTH}++;
                   1783:         return $self->BEGIN_BRANCH();
1.51      bowersj2 1784:     }
                   1785: 
1.52      bowersj2 1786:     # Remember the size for comparision next time.
                   1787:     $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}});
                   1788: 
                   1789:     # If the next resource we mean to return is going to need
                   1790:     # a lower branch level, terminate branches until we get 
                   1791:     # there.
                   1792: 
1.51      bowersj2 1793:     # Get the next resource in the branch
                   1794:     $self->{HERE} = pop @{$self->{BRANCH_STACK}};
1.52      bowersj2 1795: 
                   1796:     # Are we at the right depth? If not, close a branch and return
                   1797:     # the current resource onto the branch stack
                   1798:     if (defined($self->{HERE}->{DATA}->{ITERATOR_DEPTH})
                   1799:         && $self->{HERE}->{DATA}->{ITERATOR_DEPTH} <
                   1800:         $self->{BRANCH_DEPTH} ) {
                   1801:         $self->{BRANCH_DEPTH}--;
                   1802:         # return it so we can pick it up eventually
                   1803:         push @{$self->{BRANCH_STACK}}, $self->{HERE};
                   1804:         return $self->END_BRANCH();
                   1805:     }
                   1806: 
1.51      bowersj2 1807:     # We always return it after this point and never before
                   1808:     # (proof: look at just the return statements), so we
                   1809:     # remember that we've seen this.
                   1810:     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
                   1811:     
                   1812:     # Are we at the utter end? If so, return the END_NAV_MAP marker.
                   1813:     if ($self->{HERE} == $self->{NAV_MAP}->finishResource() ) {
1.52      bowersj2 1814:         $self->{FORCE_NEXT} = $self->END_NAV_MAP;
1.51      bowersj2 1815:         return $self->{HERE};
                   1816:     }
                   1817:     
                   1818:     # Get the next possible resources
                   1819:     my $nextUnfiltered = $self->{HERE}->getNext();
                   1820:     my $next = [];
                   1821: 
                   1822:     # filter the next possibilities to remove things we've 
1.52      bowersj2 1823:     # already seen. Also, remember what branch depth they should
                   1824:     # be displayed at, since there's no other reliable way to tell.
1.51      bowersj2 1825:     foreach (@$nextUnfiltered) {
1.52      bowersj2 1826:         if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
                   1827:             push @$next, $_;
                   1828:             $_->{DATA}->{ITERATOR_DEPTH} = 
                   1829:                 $self->{BRANCH_DEPTH} + 1;
                   1830:         }
1.51      bowersj2 1831:     }
                   1832: 
                   1833:     # Handle branch cases:
                   1834:     # Nothing is available next: BRANCH_END
                   1835:     # 1 thing next: standard non-branch
                   1836:     # 2+ things next: have some branches
                   1837:     my $nextCount = scalar(@$next);
                   1838:     if ($nextCount == 0) {
1.52      bowersj2 1839:         # Return this and on the next run, close the branch up if we're 
                   1840:         # in a branch
                   1841:         if ($self->{BRANCH_DEPTH} > 0 ) {
                   1842:             $self->{FORCE_NEXT} = $self->END_BRANCH();
                   1843:             $self->{BRANCH_DEPTH}--;
                   1844:         }
1.51      bowersj2 1845:         return $self->{HERE};
                   1846:     }
                   1847:     
                   1848:     while (@$next) {
                   1849:         # copy the next possibilities over to the branch stack
                   1850:         # in the right order
1.52      bowersj2 1851:         push @{$self->{BRANCH_STACK}}, shift @$next;
1.51      bowersj2 1852:     }
                   1853: 
                   1854:     if ($nextCount >= 2) {
1.52      bowersj2 1855:         $self->{FORCE_NEXT} = $self->BEGIN_BRANCH();
                   1856:         $self->{BRANCH_DEPTH}++;
1.51      bowersj2 1857:         return $self->{HERE}; 
                   1858:     }
                   1859: 
                   1860:     # If this is a map and we want to recurse down it... (not filtered out)
                   1861:     if ($self->{HERE}->is_map() && 
                   1862:          !defined($self->{FILTER}->{$self->{HERE}->map_pc()})) { 
                   1863:         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
                   1864:         my $firstResource = $self->{HERE}->map_start();
                   1865:         my $finishResource = $self->{HERE}->map_finish();
                   1866: 
                   1867:         # Odd perl syntax here; $self->new allows one to create a new iterator
                   1868:         # can't figure out how to ref this package directly correctly
                   1869:         # isn't MAIN::new, __PACKAGE__::new or Apache::lonnavmaps::iterator->new
                   1870:         $self->{RECURSIVE_ITERATOR} =
                   1871:           Apache::lonnavmaps::iterator->new ($self->{NAV_MAP}, $firstResource, 
                   1872:                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN});
1.52      bowersj2 1873:         # prime the new iterator with the first resource
                   1874:         #push @{$self->{RECURSIVE_ITERATOR}->{BRANCH_STACK}}, $firstResource;
1.51      bowersj2 1875:     }
                   1876: 
                   1877:     return $self->{HERE};
                   1878: }
                   1879: 
                   1880: =pod
                   1881: 
                   1882: The other method available on the iterator is B<getStack>, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map).
                   1883: 
                   1884: =cut
                   1885: 
                   1886: sub getStack {
                   1887:     my $self=shift;
                   1888: 
                   1889:     my @stack;
                   1890: 
                   1891:     $self->populateStack(\@stack);
                   1892: 
                   1893:     return \@stack;
                   1894: }
                   1895: 
                   1896: # Private method: Calls the iterators recursively to populate the stack.
                   1897: sub populateStack {
                   1898:     my $self=shift;
                   1899:     my $stack = shift;
                   1900: 
                   1901:     push @$stack, $self->{HERE};
                   1902: 
                   1903:     if ($self->{RECURSIVE_ITERATOR_FLAG}) {
                   1904:         $self->{RECURSIVE_ITERATOR}->populateStack($stack);
                   1905:     }
                   1906: }
                   1907: 
1.1       www      1908: 1;
1.2       www      1909: 
1.51      bowersj2 1910: package Apache::lonnavmaps::resource;
                   1911: 
                   1912: use Apache::lonnet;
                   1913: 
                   1914: =pod
                   1915: 
                   1916: =head1 Object: resource
                   1917: 
                   1918: A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers.
                   1919: 
                   1920: A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.
                   1921: 
                   1922: You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.
                   1923: 
                   1924: =head2 Public Members
                   1925: 
                   1926: resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash.
                   1927: 
                   1928: =head2 Methods
                   1929: 
                   1930: =over 4
                   1931: 
                   1932: =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. 
                   1933: 
                   1934: =cut
                   1935: 
                   1936: sub new {
                   1937:     # magic invocation to create a class instance
                   1938:     my $proto = shift;
                   1939:     my $class = ref($proto) || $proto;
                   1940:     my $self = {};
                   1941: 
                   1942:     $self->{NAV_MAP} = shift;
                   1943:     $self->{ID} = shift;
                   1944: 
                   1945:     # Store this new resource in the parent nav map's cache.
                   1946:     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
                   1947: 
                   1948:     # A hash that can be used by two-pass algorithms to store data
                   1949:     # about this resource in. Not used by the resource object
                   1950:     # directly.
                   1951:     $self->{DATA} = {};
                   1952:    
                   1953:     bless($self);
                   1954:     
                   1955:     return $self;
                   1956: }
                   1957: 
                   1958: =pod
                   1959: 
                   1960: =item * B<is_map>: Returns true if this is a map, false otherwise.
                   1961: 
                   1962: =item * B<title>: Returns title.
                   1963: 
                   1964: =item * B<type>: Returns the type of the resource, "start", "normal", or "finish". 
                   1965: 
                   1966: =item * B<problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field.)
                   1967: 
                   1968: =back
                   1969: 
                   1970: =cut
                   1971: 
                   1972: # private function: simplify the NAV_HASH lookups we keep doing
                   1973: # pass the name, and to automatically append my ID, pass a true val on the
                   1974: # second param
                   1975: sub navHash {
                   1976:     my $self = shift;
                   1977:     my $param = shift;
                   1978:     my $id = shift;
                   1979:     return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")};
                   1980: }
                   1981: 
                   1982: # These info functions can be used directly, as they don't return
                   1983: # resource information.
                   1984: sub title { my $self=shift; return $self->navHash("title_", 1); }
                   1985: sub type { my $self=shift; return $self->navHash("type_", 1); }
                   1986: sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
                   1987: # "to" can return a comma seperated list for branches
                   1988: sub to { my $self=shift; return $self->navHash("to_", 1); }
                   1989: sub kind { my $self=shift; return $self->navHash("kind_", 1); }
                   1990: sub src { 
                   1991:     my $self=shift;
                   1992:     return $self->navHash("src_", 1);
                   1993: }
                   1994: sub symb {
                   1995:     my $self=shift;
                   1996:     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
                   1997:     my $symbSrc = &Apache::lonnet::declutter($self->src());
                   1998:     return &Apache::lonnet::declutter(
                   1999:          $self->navHash('map_id_'.$first)) 
                   2000:         . '___' . $second . '___' . $symbSrc;
                   2001: }
                   2002: sub is_problem {
                   2003:     my $self=shift;
                   2004:     my $src = $self->src();
                   2005:     return ($src =~ /problem$/);
                   2006: }
                   2007: sub is_html {
                   2008:     my $self=shift;
                   2009:     my $src = $self->src();
                   2010:     return ($src =~ /html$/);
                   2011: }
                   2012: sub is_sequence {
                   2013:     my $self=shift;
                   2014:     my $src = $self->src();
                   2015:     return ($src =~ /sequence$/);
                   2016: }
                   2017: sub is_page {
                   2018:     my $self=shift;
                   2019:     my $src = $self->src();
                   2020:     return ($src =~ /page$/);
                   2021: }
                   2022: 
                   2023: 
                   2024: 
                   2025: 
                   2026: # Move this into POD: In order to use these correctly, courseopt
                   2027: # and useropt need to be generated
                   2028: sub parmval {
                   2029:     my $self = shift;
                   2030:     my $what = shift;
                   2031:     my $part = shift || "0";
                   2032:     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
                   2033: }
                   2034: 
                   2035: #####
                   2036: # Map Queries
                   2037: #####
                   2038: 
                   2039: # These methods relate to whether or not the resource is a map, and the 
                   2040: # attributes of that map.
                   2041: 
                   2042: sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
                   2043: sub map_finish {
                   2044:     my $self = shift;
                   2045:     my $src = $self->src();
                   2046:     my $res = $self->navHash("map_finish_$src", 0);
                   2047:     $res = $self->{NAV_MAP}->getById($res);
                   2048:     return $res;
                   2049: }
                   2050: sub map_start {
                   2051:     my $self = shift;
                   2052:     my $src = $self->src();
                   2053:     my $res = $self->navHash("map_start_$src", 0);
                   2054:     $res = $self->{NAV_MAP}->getById($res);
                   2055:     return $res;
                   2056: }
                   2057: sub map_pc {
                   2058:     my $self = shift;
                   2059:     my $src = $self->src();
                   2060:     return $self->navHash("map_pc_$src", 0);
                   2061: }
                   2062: sub map_type {
                   2063:     my $self = shift;
                   2064:     my $pc = $self->map_pc();
                   2065:     return $self->navHash("map_type_$pc", 0);
                   2066: }
                   2067: 
                   2068: 
                   2069: 
                   2070: #####
                   2071: # Property queries
                   2072: #####
                   2073: 
                   2074: # These functions will be responsible for returning the CORRECT
                   2075: # VALUE for the parameter, no matter what. So while they may look
                   2076: # like direct calls to parmval, they can be more then that.
                   2077: # So, for instance, the duedate function should use the "duedatetype"
                   2078: # information, rather then the resource object user.
                   2079: 
                   2080: =pod
                   2081: 
                   2082: =head2 Resource Parameters
                   2083: 
                   2084: In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to "part 0", but can be directed to another part by passing the part as the second parameter.
                   2085: 
                   2086: These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)
                   2087: 
                   2088: =over 4
                   2089: 
                   2090: =item * B<acc>: Get the Client IP/Name Access Control information.
                   2091: 
                   2092: =item * B<answerdate>: Get the answer-reveal date for the problem.
                   2093: 
                   2094: =item * B<duedate>: Get the due date for the problem.
                   2095: 
                   2096: =item * B<tries>: Get the number of tries the student has used on the problem.
                   2097: 
                   2098: =item * B<maxtries>: Get the number of max tries allowed.
                   2099: 
                   2100: =item * B<opendate>: Get the open date for the problem.
                   2101: 
                   2102: =item * B<sig>: Get the significant figures setting.
                   2103: 
                   2104: =item * B<tol>: Get the tolerance for the problem.
                   2105: 
                   2106: =item * B<type>: Get the question type for the problem.
                   2107: 
                   2108: =item * B<weight>: Get the weight for the problem.
                   2109: 
                   2110: =back
                   2111: 
                   2112: =cut
                   2113: 
                   2114: sub acc {
                   2115:     (my $self, my $part) = @_;
                   2116:     return $self->parmval("acc", $part);
                   2117: }
                   2118: sub answerdate {
                   2119:     (my $self, my $part) = @_;
                   2120:     # Handle intervals
                   2121:     if ($self->parmval("answerdate.type", $part) eq 'date_interval') {
                   2122:         return $self->duedate($part) + 
                   2123:             $self->parmval("answerdate", $part);
                   2124:     }
                   2125:     return $self->parmval("answerdate", $part);
                   2126: }
                   2127: sub duedate {
                   2128:     (my $self, my $part) = @_;
                   2129:     return $self->parmval("duedate", $part);
                   2130: }
                   2131: sub maxtries {
                   2132:     (my $self, my $part) = @_;
                   2133:     return $self->parmval("maxtries", $part);
                   2134: }
                   2135: sub opendate {
                   2136:     (my $self, my $part) = @_;
                   2137:     if ($self->parmval("opendate.type", $part) eq 'date_interval') {
                   2138:         return $self->duedate($part) -
                   2139:             $self->parmval("opendate", $part);
                   2140:     }
                   2141:     return $self->parmval("opendate");
                   2142: }
                   2143: sub sig {
                   2144:     (my $self, my $part) = @_;
                   2145:     return $self->parmval("sig", $part);
                   2146: }
                   2147: sub tol {
                   2148:     (my $self, my $part) = @_;
                   2149:     return $self->parmval("tol", $part);
                   2150: }
                   2151: sub type {
                   2152:     (my $self, my $part) = @_;
                   2153:     return $self->parmval("type", $part);
                   2154: }
                   2155: sub weight {
                   2156:     (my $self, my $part) = @_;
                   2157:     return $self->parmval("weight", $part);
                   2158: }
                   2159: sub tries {
                   2160:     my $self = shift;
                   2161:     my $part = shift;
                   2162:     $part = '0' if (!defined($part));
                   2163: 
                   2164:     # Make sure return hash is loaded, should error check
                   2165:     $self->getReturnHash();
                   2166:     
                   2167:     my $tries = $self->{RETURN_HASH}->{'resource.'.$part.'.tries'};
                   2168:     if (!defined($tries)) {return '0';}
                   2169:     return $tries;
                   2170: }
                   2171: 
                   2172: # Multiple things need this
                   2173: sub getReturnHash {
                   2174:     my $self = shift;
                   2175:     
                   2176:     if (!defined($self->{RETURN_HASH})) {
                   2177:         my %tmpHash = &Apache::lonnet::restore($self->symb());
                   2178:         $self->{RETURN_HASH} = \%tmpHash;
                   2179:     }
                   2180: }       
                   2181: 
                   2182: ######
                   2183: # Status queries
                   2184: ######
                   2185: 
                   2186: # These methods query the status of problems.
                   2187: 
                   2188: # If we need to count parts, this function determines the number of
                   2189: # parts from the metadata. When called, it returns a reference to a list
                   2190: # of strings corresponding to the parts. (Thus, using it in a scalar context
                   2191: # tells you how many parts you have in the problem:
                   2192: # $partcount = scalar($resource->countParts());
                   2193: # Don't use $self->{PARTS} directly because you don't know if it's been
                   2194: # computed yet.
                   2195: 
                   2196: =pod
                   2197: 
                   2198: =head2 Resource misc
                   2199: 
                   2200: Misc. functions for the resource.
                   2201: 
                   2202: =over 4
                   2203: 
1.59      bowersj2 2204: =item * B<hasDiscussion>: Returns a false value if there has been discussion since the user last logged in, true if there has. Always returns false if the discussion data was not extracted when the nav map was constructed.
                   2205: 
                   2206: =item * B<getFeedback>: Gets the feedback for the resource and returns the raw feedback string for the resource, or the null string if there is no feedback or the email data was not extracted when the nav map was constructed. Usually used like this:
                   2207: 
                   2208:  for (split(/\,/, $res->getFeedback())) {
                   2209:     my $link = &Apache::lonnet::escape($_);
                   2210:     ...
                   2211: 
                   2212: and use the link as appropriate.
                   2213: 
                   2214: =cut
                   2215: 
                   2216: sub hasDiscussion {
                   2217:     my $self = shift;
                   2218:     return $self->{NAV_MAP}->hasDiscussion($self->symb());
                   2219: }
                   2220: 
                   2221: sub getFeedback {
                   2222:     my $self = shift;
                   2223:     return $self->{NAV_MAP}->getFeedback($self->symb());
                   2224: }
                   2225: 
                   2226: =pod
                   2227: 
1.51      bowersj2 2228: =item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater then two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. You may or may not wish to filter out part 0.)
                   2229: 
                   2230: =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0.
                   2231: 
                   2232: =back
                   2233: 
                   2234: =cut
                   2235: 
                   2236: sub parts {
                   2237:     my $self = shift;
                   2238: 
                   2239:     $self->extractParts();
                   2240:     return $self->{PARTS};
                   2241: }
                   2242: 
                   2243: sub countParts {
                   2244:     my $self = shift;
                   2245:     
                   2246:     my $parts = $self->parts();
                   2247:     
                   2248:     if (scalar(@{$parts}) == 1) { return 1;}
                   2249: 
                   2250:     return scalar(@{$parts}) - 1;
                   2251: }
                   2252: 
                   2253: # Private function: Extracts the parts information and saves it
                   2254: sub extractParts { 
                   2255:     my $self = shift;
                   2256:     
                   2257:     return if ($self->{PARTS});
                   2258: 
                   2259:     $self->{PARTS} = [];
                   2260: 
                   2261:     # Retrieve part count
                   2262:     foreach (split(/\,/,&Apache::lonnet::metadata($self->src(), 
                   2263:                                                   'allpossiblekeys'))) {
                   2264:         if ($_ =~ /^parameter\_(.*)\_opendate$/) {
                   2265:             push @{$self->{PARTS}}, $1;
                   2266:         }
                   2267:     }
                   2268:     
                   2269:     # Is this possible to do in one line? - Jeremy
                   2270:     my @sortedParts = sort @{$self->{PARTS}};
                   2271:     $self->{PARTS} = \@sortedParts;
                   2272: 
                   2273:     return;
                   2274: }
                   2275: 
                   2276: =pod
                   2277: 
                   2278: =head2 Resource Status
                   2279: 
                   2280: Problem resources have status information, reflecting their various dates and completion statuses. You can obtain this information and import symbolic constants to represent the status.
                   2281: 
                   2282: There are two aspects to the status: the date-related information and the completion information.
                   2283: 
                   2284: Idiomatic usage of these two methods would probably look something like
                   2285: 
                   2286:  foreach ($resource->parts()) {
                   2287:     my $dateStatus = $resource->getDateStatus($_);
                   2288:     my $completionStatus = $resource->getCompletionStatus($_);
                   2289: 
                   2290:     ... use it here ...
                   2291:  }
                   2292: 
                   2293: =over 4
                   2294: 
1.59      bowersj2 2295: =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. You should still check to see if there is a due date at all, if you care about that. The possible return values are:
1.51      bowersj2 2296: 
                   2297: =back
                   2298: 
                   2299: B<Date Codes>
                   2300: 
                   2301: =over 4
                   2302: 
                   2303: =item * B<OPEN_LATER>: The problem will be opened later.
                   2304: 
                   2305: =item * B<OPEN>: Open and not yet due.
                   2306: 
1.59      bowersj2 2307: 
1.54      bowersj2 2308: =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.
                   2309: 
                   2310: =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.
1.51      bowersj2 2311: 
                   2312: =item * B<ANSWER_OPEN>: The answer date is here.
                   2313: 
                   2314: =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.
                   2315: 
                   2316: =back
                   2317: 
                   2318: =cut
                   2319: 
                   2320: # Apparently the compiler optimizes these into constants automatically
1.54      bowersj2 2321: sub OPEN_LATER             { return 0; }
                   2322: sub OPEN                   { return 1; }
                   2323: sub PAST_DUE_NO_ANSWER     { return 2; }
                   2324: sub PAST_DUE_ANSWER_LATER  { return 3; }
                   2325: sub ANSWER_OPEN            { return 4; }
                   2326: sub NOTHING_SET            { return 5; } 
                   2327: sub NETWORK_FAILURE        { return 100; }
                   2328: 
                   2329: # getDateStatus gets the date status for a given problem part. 
                   2330: # Because answer date, due date, and open date are fully independent
                   2331: # (i.e., it is perfectly possible to *only* have an answer date), 
                   2332: # we have to completely cover the 3x3 maxtrix of (answer, due, open) x
                   2333: # (past, future, none given). This function handles this with a decision
                   2334: # tree. Read the comments to follow the decision tree.
1.51      bowersj2 2335: 
                   2336: sub getDateStatus {
                   2337:     my $self = shift;
                   2338:     my $part = shift;
                   2339:     $part = "0" if (!defined($part));
1.54      bowersj2 2340: 
                   2341:     # Always return network failure if there was one.
1.51      bowersj2 2342:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   2343: 
                   2344:     my $now = time();
                   2345: 
1.53      bowersj2 2346:     my $open = $self->opendate($part);
                   2347:     my $due = $self->duedate($part);
                   2348:     my $answer = $self->answerdate($part);
                   2349: 
                   2350:     if (!$open && !$due && !$answer) {
                   2351:         # no data on the problem at all
                   2352:         # should this be the same as "open later"? think multipart.
                   2353:         return $self->NOTHING_SET;
                   2354:     }
1.59      bowersj2 2355:     if (!$open || $now < $open) {return $self->OPEN_LATER}
                   2356:     if (!$due || $now < $due) {return $self->OPEN}
                   2357:     if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER}
                   2358:     if ($answer) { return $self->ANSWER_OPEN; }
1.54      bowersj2 2359:     return PAST_DUE_NO_ANSWER;
1.51      bowersj2 2360: }
                   2361: 
                   2362: =pod
                   2363: 
                   2364: B<>
                   2365: 
                   2366: =over 4
                   2367: 
                   2368: =item * B<getCompletionStatus>($part): ($part defaults to 0.) A convenience function that returns a symbolic constant telling you about the completion status of the part, with the following possible results:
                   2369: 
                   2370: =back 
                   2371: 
                   2372: B<Completion Codes>
                   2373: 
                   2374: =over 4
                   2375: 
                   2376: =item * B<NOT_ATTEMPTED>: Has not been attempted at all.
                   2377: 
                   2378: =item * B<INCORRECT>: Attempted, but wrong by student.
                   2379: 
                   2380: =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.
                   2381: 
                   2382: =item * B<CORRECT>: Correct or correct by instructor.
                   2383: 
                   2384: =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.
                   2385: 
                   2386: =item * B<EXCUSED>: Excused. Not yet implemented.
                   2387: 
                   2388: =item * B<NETWORK_FAILURE>: Information not available due to network failure.
                   2389: 
                   2390: =back
                   2391: 
                   2392: =cut
                   2393: 
1.53      bowersj2 2394: sub NOT_ATTEMPTED         { return 10; }
                   2395: sub INCORRECT             { return 11; }
                   2396: sub INCORRECT_BY_OVERRIDE { return 12; }
                   2397: sub CORRECT               { return 13; }
                   2398: sub CORRECT_BY_OVERRIDE   { return 14; }
                   2399: sub EXCUSED               { return 15; }
1.51      bowersj2 2400: 
                   2401: sub getCompletionStatus {
                   2402:     my $self = shift;
                   2403:     my $part = shift;
                   2404:     $part = "0" if (!defined($part));
                   2405:     return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});
                   2406: 
                   2407:     # Make sure return hash exists
                   2408:     $self->getReturnHash();
                   2409:     
                   2410:     my $status = $self->{RETURN_HASH}->{'resource.'.$part.'.solved'};
                   2411: 
                   2412:     # Left as seperate if statements in case we ever do more with this
                   2413:     if ($status eq 'correct_by_student') {return $self->CORRECT;}
                   2414:     if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; }
                   2415:     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
                   2416:     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
                   2417:     if ($status eq 'excused') {return $self->EXCUSED; }
                   2418:     return $self->NOT_ATTEMPTED;
                   2419: }
                   2420: 
                   2421: =pod
                   2422: 
                   2423: B<Composite Status>
                   2424: 
                   2425: Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE()):
                   2426: 
                   2427: =over 4
                   2428: 
                   2429: =item * NETWORK_FAILURE: The network has failed and the information is not available.
                   2430: 
1.59      bowersj2 2431: =item * NOTHING_SET: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)
1.53      bowersj2 2432: 
1.51      bowersj2 2433: =item * CORRECT: For any reason at all, the part is considered correct.
                   2434: 
                   2435: =item * EXCUSED: For any reason at all, the problem is excused.
                   2436: 
1.54      bowersj2 2437: =item * PAST_DUE_NO_ANSWER: The problem is past due, not considered correct, and no answer date is set.
                   2438: 
                   2439: =item * PAST_DUE_ANSWER_LATER: The problem is past due, not considered correct, and an answer date in the future is set.
1.51      bowersj2 2440: 
                   2441: =item * ANSWER_OPEN: The problem is past due, not correct, and the answer is now available.
                   2442: 
                   2443: =item * OPEN_LATER: The problem is not yet open.
                   2444: 
                   2445: =item * TRIES_LEFT: The problem is open, has been tried, is not correct, but there are tries left.
                   2446: 
                   2447: =item * INCORRECT: The problem is open, and all tries have been used without getting the correct answer.
                   2448: 
                   2449: =item * OPEN: The item is open and not yet tried.
                   2450: 
                   2451: =back
                   2452: 
                   2453: =cut
                   2454: 
                   2455: sub TRIES_LEFT { return 10; }
                   2456: 
                   2457: sub status {
                   2458:     my $self = shift;
                   2459:     my $part = shift;
                   2460:     if (!defined($part)) { $part = "0"; }
                   2461:     my $completionStatus = $self->getCompletionStatus($part);
                   2462:     my $dateStatus = $self->getDateStatus($part);
                   2463: 
                   2464:     # What we have is a two-dimensional matrix with 4 entries on one
                   2465:     # dimension and 5 entries on the other, which we want to colorize,
1.54      bowersj2 2466:     # plus network failure and "no date data at all".
1.51      bowersj2 2467: 
1.53      bowersj2 2468:     if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; }
1.51      bowersj2 2469: 
                   2470:     # There are a few whole rows we can dispose of:
1.53      bowersj2 2471:     if ($completionStatus == CORRECT ||
                   2472:         $completionStatus == CORRECT_BY_OVERRIDE ) {
                   2473:         return CORRECT(); 
                   2474:     }
                   2475: 
                   2476:     # If it's EXCUSED, then return that no matter what
                   2477:     if ($completionStatus == EXCUSED) {
                   2478:         return EXCUSED; 
1.51      bowersj2 2479:     }
                   2480: 
1.53      bowersj2 2481:     if ($dateStatus == NOTHING_SET) {
                   2482:         return NOTHING_SET;
1.51      bowersj2 2483:     }
                   2484: 
                   2485:     # Now we're down to a 3 (incorrect, incorrect_override, not_attempted)
                   2486:     # by 4 matrix (date status).
                   2487: 
1.54      bowersj2 2488:     if ($dateStatus == PAST_DUE_ANSWER_LATER ||
1.59      bowersj2 2489:         $dateStatus == PAST_DUE_NO_ANSWER ) {
1.54      bowersj2 2490:         return $dateStatus; 
1.51      bowersj2 2491:     }
                   2492: 
1.53      bowersj2 2493:     if ($dateStatus == ANSWER_OPEN) {
                   2494:         return ANSWER_OPEN;
1.51      bowersj2 2495:     }
                   2496: 
                   2497:     # Now: (incorrect, incorrect_override, not_attempted) x 
                   2498:     # (open_later), (open)
                   2499:     
1.53      bowersj2 2500:     if ($dateStatus == OPEN_LATER) {
                   2501:         return OPEN_LATER;
1.51      bowersj2 2502:     }
                   2503: 
                   2504:     # If it's WRONG...
1.53      bowersj2 2505:     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
1.51      bowersj2 2506:         # and there are TRIES LEFT:
                   2507:         if ($self->tries() < $self->maxtries()) {
1.53      bowersj2 2508:             return TRIES_LEFT;
1.51      bowersj2 2509:         }
1.53      bowersj2 2510:         return INCORRECT; # otherwise, return orange; student can't fix this
1.51      bowersj2 2511:     }
                   2512: 
                   2513:     # Otherwise, it's untried and open
1.53      bowersj2 2514:     return OPEN; 
1.51      bowersj2 2515: }
                   2516: 
                   2517: =pod
                   2518: 
                   2519: =head2 Resource/Nav Map Navigation
                   2520: 
                   2521: =over 4
                   2522: 
                   2523: =item * B<getNext>(): Gets the next resource in the navmap after this one.
                   2524: 
                   2525: =cut
                   2526: 
                   2527: # For the simple single-link case, to get from a resource to the next
                   2528: # resource, you need to look up the "to_" link in the nav hash, then
                   2529: # follow that with the "goesto_" link.
                   2530: 
                   2531: sub getNext {
                   2532:     my $self = shift;
                   2533:     my $alreadySeenHash = shift;
                   2534:     my @branches;
                   2535:     my $to = $self->to();
                   2536:     foreach my $branch ( split(/\,/, $to) ) {
                   2537:         my $choice = $self->{NAV_MAP}->getById($branch);
                   2538:         my $next = $choice->goesto();
                   2539:         $next = $self->{NAV_MAP}->getById($next);
                   2540: 
1.61      bowersj2 2541:         # Don't remember it if we've already seen it or if
                   2542: 	# the student doesn't have browse priviledges
                   2543: 	my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
1.51      bowersj2 2544:         if (!defined($alreadySeenHash) ||
1.61      bowersj2 2545:             !defined($alreadySeenHash->{$next->{ID}}) ||
                   2546: 	    ($browsePriv ne '2' && $browsePriv ne 'F')) {
1.51      bowersj2 2547:                 push @branches, $next;
                   2548:             }
                   2549:     }
                   2550:     return \@branches;
                   2551: }
                   2552: 
                   2553: =pod
1.2       www      2554: 
1.51      bowersj2 2555: =back
1.2       www      2556: 
1.51      bowersj2 2557: =cut
1.2       www      2558: 
1.51      bowersj2 2559: 1;
1.2       www      2560: 
1.51      bowersj2 2561: __END__
1.2       www      2562: 
                   2563: 

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