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Diff for /loncom/interface/lonnavmaps.pm between versions 1.115 and 1.182

version 1.115, 2002/11/26 14:45:24 version 1.182, 2003/04/25 17:02:26
Line 1 Line 1
   
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # Navigate Maps Handler  # Navigate Maps Handler
 #  #
Line 38 Line 37
 # YEAR=2002  # YEAR=2002
 # 1/1 Gerd Kortemeyer  # 1/1 Gerd Kortemeyer
 # Oct-Nov Jeremy Bowers  # Oct-Nov Jeremy Bowers
   # YEAR=2003
   # Jeremy Bowers ... lots of days
   
 package Apache::lonnavmaps;  package Apache::lonnavmaps;
   
 use strict;  use strict;
 use Apache::Constants qw(:common :http);  use Apache::Constants qw(:common :http);
 use Apache::loncommon();  use Apache::loncommon();
   use Apache::lonmenu();
 use POSIX qw (floor strftime);  use POSIX qw (floor strftime);
   
   # symbolic constants
   sub SYMB { return 1; }
   sub URL { return 2; }
   sub NOTHING { return 3; }
   
   # Some data
   
   my $resObj = "Apache::lonnavmaps::resource";
   
   # Keep these mappings in sync with lonquickgrades, which uses the colors
   # instead of the icons.
   my %statusIconMap = 
       ( $resObj->NETWORK_FAILURE    => '',
         $resObj->NOTHING_SET        => '',
         $resObj->CORRECT            => 'navmap.correct.gif',
         $resObj->EXCUSED            => 'navmap.correct.gif',
         $resObj->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
         $resObj->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
         $resObj->ANSWER_OPEN        => 'navmap.wrong.gif',
         $resObj->OPEN_LATER         => '',
         $resObj->TRIES_LEFT         => 'navmap.open.gif',
         $resObj->INCORRECT          => 'navmap.wrong.gif',
         $resObj->OPEN               => 'navmap.open.gif',
         $resObj->ATTEMPTED          => 'navmap.open.gif' );
   
   my %iconAltTags = 
       ( 'navmap.correct.gif' => 'Correct',
         'navmap.wrong.gif'   => 'Incorrect',
         'navmap.open.gif'    => 'Open' );
   
   # Defines a status->color mapping, null string means don't color
   my %colormap = 
       ( $resObj->NETWORK_FAILURE        => '',
         $resObj->CORRECT                => '',
         $resObj->EXCUSED                => '#3333FF',
         $resObj->PAST_DUE_ANSWER_LATER  => '',
         $resObj->PAST_DUE_NO_ANSWER     => '',
         $resObj->ANSWER_OPEN            => '#006600',
         $resObj->OPEN_LATER             => '',
         $resObj->TRIES_LEFT             => '',
         $resObj->INCORRECT              => '',
         $resObj->OPEN                   => '',
         $resObj->NOTHING_SET            => '' );
   # And a special case in the nav map; what to do when the assignment
   # is not yet done and due in less then 24 hours
   my $hurryUpColor = "#FF0000";
   
 sub handler {  sub handler {
     my $r = shift;      my $r = shift;
       real_handler($r);
   }
   
     &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});  sub real_handler {
       my $r = shift;
   
     # Handle header-only request      # Handle header-only request
     if ($r->header_only) {      if ($r->header_only) {
Line 85  sub handler { Line 137  sub handler {
   
     $r->print("<html><head>\n");      $r->print("<html><head>\n");
     $r->print("<title>Navigate Course Contents</title>");      $r->print("<title>Navigate Course Contents</title>");
   # ------------------------------------------------------------ Get query string
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']);
       
   # ----------------------------------------------------- Force menu registration
       my $addentries='';
       if ($ENV{'form.register'}) {
          $addentries=' onLoad="'.&Apache::lonmenu::loadevents().
      '" onUnload="'.&Apache::lonmenu::unloadevents().'"';
          $r->print(&Apache::lonmenu::registerurl(1));
       }
   
     # Header      # Header
     $r->print(&Apache::loncommon::bodytag('Navigate Course Contents','',      $r->print('</head>'.
                                           ''));                &Apache::loncommon::bodytag('Navigate Course Contents','',
                                       $addentries,'','',$ENV{'form.register'}));
     $r->print('<script>window.focus();</script>');      $r->print('<script>window.focus();</script>');
   
     $r->print('<table border="0" cellpadding="2" cellspacing="0">');  
     my $date=localtime;  
     $r->print('<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>');  
   
     # Print discussions and feedback header  
     if ($navmap->{LAST_CHECK}) {  
         $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.  
                   '<img src="/adm/lonMisc/chat.gif"> New discussion since '.  
                   strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).  
                   '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.  
                   '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.  
                   '</td>');   
     } else {  
         $r->print('<td align="center" valign="bottom">&nbsp;&nbsp;'.  
                   '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.  
                   '&nbsp;&nbsp;<img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.  
                   '</td>');   
     }  
     $r->print('</tr></table>');  
   
     my $condition = 0;  
     if ($ENV{'form.condition'}) {  
         $condition = 1;  
     }  
   
     my $currenturl = $ENV{'form.postdata'};  
     $currenturl=~s/^http\:\/\///;  
     $currenturl=~s/^[^\/]+//;  
   
     # alreadyHere allows us to only open the maps necessary to view  
     # the current location once, while at the same time remembering  
     # the current location. Without that check, the user would never  
     # be able to close those maps; the user would close it, and the  
     # currenturl scan would re-open it.  
     my $queryAdd = "postdata=" . &Apache::lonnet::escape($currenturl) .  
         "&alreadyHere=1";  
   
     if ($condition) {  
         $r->print("<a href=\"navmaps?condition=0&filter=&$queryAdd\">Close All Folders</a>");  
     } else {  
         $r->print("<a href=\"navmaps?condition=1&filter=&$queryAdd\">Open All Folders</a>");  
     }  
   
     $r->print('<br>&nbsp;');  
     $r->rflush();      $r->rflush();
   
     # Now that we've displayed some stuff to the user, init the navmap      # Now that we've displayed some stuff to the user, init the navmap
     $navmap->init();      $navmap->init();
   
       $r->print('<br>&nbsp;');
       $r->rflush();
   
     # Check that it's defined      # Check that it's defined
     if (!($navmap->courseMapDefined())) {      if (!($navmap->courseMapDefined())) {
         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .          $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
Line 147  sub handler { Line 169  sub handler {
         return OK;          return OK;
     }      }
   
     # Grab a resource object so we have access to the constants; this      # See if there's only one map in the top-level, if we don't
     # is technically not proper, but should be harmless      # already have a filter... if so, automatically display it
     my $res = $navmap->firstResource();      if ($ENV{QUERY_STRING} !~ /filter/) {
           my $iterator = $navmap->getIterator(undef, undef, undef, 0);
     # These are some data tables, which make it easy to change some of          my $depth = 1;
     # of the specific visualization parameters if desired.          $iterator->next();
           my $curRes = $iterator->next();
     # Defines a status->color mapping, null string means don't color          my $sequenceCount = 0;
     my %colormap =           my $sequenceId;
     ( $res->NETWORK_FAILURE        => '',          while ($depth > 0) {
       $res->CORRECT                => '',              if ($curRes == $iterator->BEGIN_MAP()) { $depth++; }
       $res->EXCUSED                => '#3333FF',              if ($curRes == $iterator->END_MAP()) { $depth--; }
       $res->PAST_DUE_ANSWER_LATER  => '',  
       $res->PAST_DUE_NO_ANSWER     => '',  
       $res->ANSWER_OPEN            => '#006600',  
       $res->OPEN_LATER             => '',  
       $res->TRIES_LEFT             => '',  
       $res->INCORRECT              => '',  
       $res->OPEN                   => '',  
       $res->NOTHING_SET            => ''        );  
     # And a special case in the nav map; what to do when the assignment  
     # is not yet done and due in less then 24 hours  
     my $hurryUpColor = "#FF0000";  
   
     # Keep these mappings in sync with lonquickgrades, which uses the colors  
     # instead of the icons.  
     my %statusIconMap =   
         ( $res->NETWORK_FAILURE    => '',  
           $res->NOTHING_SET        => '',  
           $res->CORRECT            => 'navmap.correct.gif',  
           $res->EXCUSED            => 'navmap.correct.gif',  
           $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',  
           $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',  
           $res->ANSWER_OPEN        => 'navmap.wrong.gif',  
           $res->OPEN_LATER         => '',  
           $res->TRIES_LEFT         => 'navmap.open.gif',  
           $res->INCORRECT          => 'navmap.wrong.gif',  
           $res->OPEN               => 'navmap.open.gif',  
           $res->ATTEMPTED          => 'navmap.open.gif' );  
   
     my %iconAltTags =   
         ( 'navmap.correct.gif' => 'Correct',  
           'navmap.wrong.gif'   => 'Incorrect',  
           'navmap.open.gif'    => 'Open' );  
   
     my %condenseStatuses =  
         ( $res->NETWORK_FAILURE    => 1,  
           $res->NOTHING_SET        => 1,  
           $res->CORRECT            => 1 );  
   
     my %filterHash;  
     # Figure out what we're not displaying  
     foreach (split(/\,/, $ENV{"form.filter"})) {  
         if ($_) {  
             $filterHash{$_} = "1";  
         }  
     }  
   
     # Is this a new-style course? If so, we want to suppress showing the top-level  
     # maps in their own folders, in favor of "inlining" them.  
     my $topResource = $navmap->getById("0.0");  
     my $inlineTopLevelMaps = $topResource->src() =~ m|^/uploaded/.*default\.sequence$|;  
     my $inlinedelta = $inlineTopLevelMaps? -1 : 0;  
   
     # Begin the HTML table  
     # four cols: resource + indent, chat+feedback, icon, text string  
     $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");  
   
     # This needs to be updated to use symbs from the remote,   
     # instead of uris. The changes to this and the main rendering  
     # loop should be obvious.  
     # Here's a simple example of the iterator.  
     # Preprocess the map: Look for current URL, force inlined maps to display  
   
     my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 1);  
     my $found = 0;  
     my $depth = 1;  
     my $currentUrlIndex = 0; # keeps track of when the current resource is found,  
                              # so we can back up a few and put the anchor above the  
                              # current resource  
     my $currentUrlDelta = 5; # change this to change how many resources are displayed  
                              # before the current resource when using #current  
     $mapIterator->next(); # discard the first BEGIN_MAP  
     my $curRes = $mapIterator->next();  
     my $counter = 0;  
       
     while ($depth > 0) {  
         if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }  
         if ($curRes == $mapIterator->END_MAP()) { $depth--; }  
   
         if (ref($curRes)) { $counter++; }  
   
         my $mapStack = $mapIterator->getStack();  
         if ($currenturl && !$ENV{'form.alreadyHere'} && ref($curRes) &&   
             $curRes->src() eq $currenturl) {  
             # If this is the correct resource, be sure to   
             # show it by making sure the containing maps  
             # are open.  
   
             # This is why we have to use the main iterator instead of the  
             # potentially faster DFS: The count has to be the same, so  
             # the order has to be the same, which DFS won't give us.  
             $currentUrlIndex = $counter;  
                           
             # Ensure the parent maps are open              if (ref($curRes) && $curRes->is_sequence()) {
             for my $map (@{$mapStack}) {                  $sequenceCount++;
                 if ($condition) {                  $sequenceId = $curRes->map_pc();
                     undef $filterHash{$map->map_pc()};  
                 } else {  
                     $filterHash{$map->map_pc()} = 1;  
                 }  
             }              }
             $ENV{'form.alreadyHere'} = 1;  
         }  
                           
         # Preprocessing: If we're inlining nav maps into the top-level display,              $curRes = $iterator->next();
         # make sure we show this map!  
         if ($inlineTopLevelMaps && ref($curRes) && $curRes->is_map &&   
             scalar(@{$mapStack}) == 1) {  
             if ($condition) {  
                 undef $filterHash{$curRes->map_pc()};  
             } else {  
                 $filterHash{$curRes->map_pc()} = 1;  
             }  
         }  
   
         $curRes = $mapIterator->next();  
     }  
       
     undef $res; # so we don't accidentally use it later  
     my $indentLevel = 0;  
     my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";  
   
     my $isNewBranch = 0;  
     my $now = time();  
     my $in24Hours = $now + 24 * 60 * 60;  
     my $displayedHereMarker = 0;  
       
     # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"  
     # code in iterator->next), so ignore the first one  
     $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,  
                                            $condition);  
     $mapIterator->next();  
     $curRes = $mapIterator->next();  
     $depth = 1;  
   
     my @backgroundColors = ("#FFFFFF", "#F6F6F6");  
     my $rowNum = 0;  
   
     $counter = 0;  
   
     # Print the 'current' anchor here if it would fall off the top  
     if ($currentUrlIndex - $currentUrlDelta < 0) {  
         $r->print('<a name="current" />');  
     }  
   
     while ($depth > 0) {  
         if ($curRes == $mapIterator->BEGIN_MAP() ||  
             $curRes == $mapIterator->BEGIN_BRANCH()) {  
             $indentLevel++;  
         }  
         if ($curRes == $mapIterator->END_MAP() ||  
             $curRes == $mapIterator->END_BRANCH()) {  
             $indentLevel--;  
         }  
         if ($curRes == $mapIterator->BEGIN_BRANCH()) {  
             $isNewBranch = 1;  
         }  
         if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }  
         if ($curRes == $mapIterator->END_MAP()) { $depth--; }  
   
         if (ref($curRes)) { $counter++; }  
   
         # Is this resource being ignored because it is in a random-out  
         # map and it was not selected?  
         if (ref($curRes) && !advancedUser() && $curRes->randomout()) {  
             $curRes = $mapIterator->next();  
             next; # if yes, then just ignore this resource  
         }          }
           
         if (ref($curRes) && $curRes->src()) {          if ($sequenceCount == 1) {
               # The automatic iterator creation in the render call 
             my $deltalevel = $isNewBranch? 1 : 0; # reserves space for branch icon              # will pick this up. We know the condition because
               # the defined($ENV{'form.filter'}) also ensures this
             if ($indentLevel - $deltalevel + $inlinedelta < 0) {              # is a fresh call.
                 # If this would be at a negative depth (top-level maps in              $ENV{'form.filter'} = "$sequenceId";
                 # new-style courses, we want to suppress their title display)  
                 # then ignore it.  
                 $curRes = $mapIterator->next();  
                 next;  
             }  
   
             # Step one: Decide which parts to show  
             my @parts = @{$curRes->parts()};  
             my $multipart = scalar(@parts) > 1;  
             my $condensed = 0;  
                   
             if ($curRes->is_problem()) {  
   
                 # Is it multipart?  
                 if ($multipart) {  
                     # If it's multipart, see if part 0 is "open"  
                     # if it is, display all parts, if it isn't,  
                     # just display first  
                     if (!$curRes->opendate("0")) {  
                         # no parts are open, display as one part  
                         @parts = ("0");  
                         $condensed = 1;  
                     } else {  
                         # Otherwise, only display part 0 if we want to   
                         # attach feedback or email information to it  
                         if ($curRes->hasDiscussion() || $curRes->getFeedback()) {  
                             shift @parts;  
                         } else {  
                             # Now, we decide whether to condense the  
                             # parts due to similarity  
                             my $status = $curRes->status($parts[1]);  
                             my $due = $curRes->duedate($parts[1]);  
                             my $open = $curRes->opendate($parts[1]);  
                             my $statusAllSame = 1;  
                             my $dueAllSame = 1;  
                             my $openAllSame = 1;  
                             for (my $i = 2; $i < scalar(@parts); $i++) {  
                                 if ($curRes->status($parts[$i]) != $status){  
                                     $statusAllSame = 0;  
                                 }  
                                 if ($curRes->duedate($parts[$i]) != $due ) {  
                                     $dueAllSame = 0;  
                                 }  
                                 if ($curRes->opendate($parts[$i]) != $open) {  
                                     $openAllSame = 0;  
                                 }  
                             }  
                               
                             # $allSame is true if all the statuses were  
                             # the same. Now, if they are all the same and  
                             # match one of the statuses to condense, or they  
                             # are all open with the same due date, or they are  
                             # all OPEN_LATER with the same open date, display the  
                             # status of the first non-zero part (to get the 'correct'  
                             # status right, since 0 is never 'correct' or 'open').  
                             if (($statusAllSame && defined($condenseStatuses{$status})) ||  
                                 ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||  
                                 ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){  
                                 @parts = ($parts[1]);  
                                 $condensed = 1;  
                             }  
                         }  
                     }  
                 }  
   
             } else {  
                 $parts[0] = "0"; # this is to get past foreach loop below  
                  # you can consider a non-problem resource as a resource  
                   # with only one part without loss, and it simplifies the looping  
             }  
   
             # Is it a multipart problem with a single part, now in   
             # @parts with "0" filtered out? If so, 'forget' it's a multi-part  
             # problem and treat it like a single-part problem.  
             if ( scalar(@parts) == 1 ) {  
                 $multipart = 0;  
             }  
   
             # Display one part, in event of network error.  
             # If this is a single part, we can at least show the correct  
             # status, but if it's multipart, we're lost, since we can't  
             # retreive the metadata to count the parts  
             if ($curRes->{RESOURCE_ERROR}) {  
                 @parts = ("0");  
             }  
   
             # Step Two: Print the actual data.  
   
             # For each part we intend to display...  
             foreach my $part (@parts) {  
   
                 my $nonLinkedText = ""; # unlinked stuff after title  
                   
                 my $stack = $mapIterator->getStack();  
                 my $src = getLinkForResource($stack);  
   
                 # Pass the correct symb on the querystring, so the  
                 # remote will figure out where we are if we click a link  
                 my $srcHasQuestion = $src =~ /\?/;  
                 my $link = $src.  
                     ($srcHasQuestion?'&':'?') .  
                     'symb='.&Apache::lonnet::escape($curRes->symb()).  
                     '"';  
   
                 my $title = $curRes->compTitle();  
                 my $partLabel = "";  
                 my $newBranchText = "";  
   
                 # If this is a new branch, label it so  
                 if ($isNewBranch) {  
                     $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";  
                     $isNewBranch = 0;  
                 }  
   
                 # links to open and close the folders  
                 my $linkopen = "<a href=\"$link\">";  
                 my $linkclose = "</a>";  
   
                 my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";  
                 if ($curRes->is_problem()) {   
                     if ($part eq "0" || $condensed) {  
                         $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />';   
                     } else {  
                         $icon = $indentString;  
                     }  
                 }  
   
                 # Display the correct icon, link to open or shut map  
                 if ($curRes->is_map()) {   
                     my $mapId = $curRes->map_pc();  
                     my $nowOpen = (!defined($filterHash{$mapId}));  
                     if ($condition) {$nowOpen = !$nowOpen;}  
                     $icon = $nowOpen ?  
                         "navmap.folder.closed.gif" : "navmap.folder.open.gif";  
                     $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";  
                     $linkopen = "<a href=\"/adm/navmaps?filter=";  
                     $linkopen .= ($nowOpen xor $condition) ?   
                         addToFilter(\%filterHash, $mapId) :  
                         removeFromFilter(\%filterHash, $mapId);  
                     $linkopen .= "&condition=$condition&$queryAdd\">";  
                     $linkclose = "</a>";  
   
                 }  
                   
                 my $colorizer = "";  
                 my $color;  
                 if ($curRes->is_problem()) {  
                     $color = $colormap{$curRes->status};  
   
                     if (dueInLessThen24Hours($curRes, $part) ||  
                         lastTry($curRes, $part)) {  
                         $color = $hurryUpColor;  
                     }  
   
                     if ($color ne "") {  
                         $colorizer = "bgcolor=\"$color\"";  
                     }  
                 }  
   
                 if ($curRes->randomout()) {  
                     $nonLinkedText .= ' <i>(hidden)</i> ';  
                 }  
   
                 $rowNum++;  
                 my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];  
   
                 # FIRST COL: The resource indentation, branch icon, name, and anchor  
                 $r->print("  <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");  
   
                 # Print the anchor if necessary  
                 if ($counter == $currentUrlIndex - $currentUrlDelta) {  
                     $r->print('<a name="current" />');  
                 }  
   
                 # print indentation  
                 for (my $i = 0; $i < $indentLevel - $deltalevel + $inlinedelta; $i++) {  
                     $r->print($indentString);  
                 }  
   
                 $r->print("  ${newBranchText}${linkopen}$icon${linkclose}\n");  
   
                 my $curMarkerBegin = "";  
                 my $curMarkerEnd = "";  
   
                 # Is this the current resource?  
                 if ($curRes->src() eq $currenturl && !$displayedHereMarker) {  
                     $curMarkerBegin = '<a name="curloc" /><font color="red" size="+2">&gt; </font>';  
                     $curMarkerEnd = '<font color="red" size="+2"> &lt;</font>';  
                     $displayedHereMarker = 1;  
                 }  
   
                 if ($curRes->is_problem() && $part ne "0" && !$condensed) {   
                     $partLabel = " (Part $part)";   
                     $title = "";  
                 }  
                 if ($multipart && $condensed) {  
                     $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';  
                 }  
   
                 $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");  
   
                 if ($curRes->{RESOURCE_ERROR}) {  
                     $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",  
                                               '<font size="-1">Host down</font>'));  
                     }  
   
                 $r->print("</td>\n");  
   
                 # SECOND COL: Is there text, feedback, errors??  
                 my $discussionHTML = ""; my $feedbackHTML = "";  
   
                 if ($curRes->hasDiscussion()) {  
                     $discussionHTML = $linkopen .  
                         '<img border="0" src="/adm/lonMisc/chat.gif" />' .  
                         $linkclose;  
                 }  
   
                 if ($curRes->getFeedback()) {  
                     my $feedback = $curRes->getFeedback();  
                     foreach (split(/\,/, $feedback)) {  
                         if ($_) {  
                             $feedbackHTML .= '&nbsp;<a href="/adm/email?display='  
                                 . &Apache::lonnet::escape($_) . '">'  
                                 . '<img src="/adm/lonMisc/feedback.gif" '  
                                 . 'border="0" /></a>';  
                         }  
                     }  
                 }  
   
                 $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML&nbsp;</td>");  
   
                 # Is this the first displayed part of a multi-part problem  
                 # that has not been condensed, so we should suppress these two  
                 # columns so we don't display useless status info about part  
                 # "0"?  
                 my $firstDisplayed = !$condensed && $multipart && $part eq "0";  
   
                 # THIRD COL: Problem status icon  
                 if ($curRes->is_problem() &&  
                     !$firstDisplayed) {  
                     my $icon = $statusIconMap{$curRes->status($part)};  
                     my $alt = $iconAltTags{$icon};  
                     if ($icon) {  
                         $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");  
                     } else {  
                         $r->print("<td width=\"30\">&nbsp;</td>\n");  
                     }  
                 } else { # not problem, no icon  
                     $r->print("<td width=\"30\">&nbsp;</td>\n");  
                 }  
   
                 # FOURTH COL: Text description  
                 $r->print("<td align=\"right\" valign=\"center\">\n");  
                   
                 if ($curRes->kind() eq "res" &&  
                     $curRes->is_problem() &&  
                     !$firstDisplayed) {  
                     $r->print ("<font color=\"$color\"><b>") if ($color);  
                     $r->print (getDescription($curRes, $part));  
                     $r->print ("</b></font>") if ($color);  
                 }  
                 if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {  
                     $r->print('(randomly select ' . $curRes->randompick() .')');  
                 }  
   
                 $r->print("&nbsp;</td></tr>\n");  
   
                 if (!($counter % 20)) { $r->rflush(); }  
                 if ($counter == 2) { $r->rflush(); }  
             }  
         }          }
         $curRes = $mapIterator->next();  
     }      }
   
     $r->print("</table></body></html>");      # renderer call
       my $render = render({ 'cols' => [0,1,2,3],
                             'url' => '/adm/navmaps',
                             'navmap' => $navmap,
                             'suppressNavmap' => 1,
                             'r' => $r});
   
     $navmap->untieHashes();      $navmap->untieHashes();
   
       $r->print("</body></html>");
       $r->rflush();
   
     return OK;      return OK;
 }  }
   
Line 671  sub getDescription { Line 271  sub getDescription {
     my $part = shift;      my $part = shift;
     my $status = $res->status($part);      my $status = $res->status($part);
   
     if ($status == $res->NETWORK_FAILURE) { return ""; }      if ($status == $res->NETWORK_FAILURE) { 
           return "Having technical difficulties; please check status later"; 
       }
     if ($status == $res->NOTHING_SET) {      if ($status == $res->NOTHING_SET) {
         return "Not currently assigned.";          return "Not currently assigned.";
     }      }
Line 747  sub lastTry { Line 349  sub lastTry {
 }  }
   
 # This puts a human-readable name on the ENV variable.  # This puts a human-readable name on the ENV variable.
   
 sub advancedUser {  sub advancedUser {
     return $ENV{'user.adv'};      return $ENV{'request.role.adv'};
 }  }
   
   
Line 857  sub timeToHumanString { Line 460  sub timeToHumanString {
     }      }
 }  }
   
   
   =pod
   
   =head1 NAME
   
   Apache::lonnavmap - Subroutines to handle and render the navigation maps
   
   =head1 SYNOPSIS
   
   The main handler generates the navigational listing for the course,
   the other objects export this information in a usable fashion for
   other modules
   
   =head1 Object: render
   
   The navmap renderer package provides a sophisticated rendering of the
   standard navigation maps interface into HTML. The provided nav map
   handler is actually just a glorified call to this.
   
   Because of the large number of parameters this function presents,
   instead of passing it arguments as is normal, pass it in an anonymous
   hash with the given options. This is because there is no obvious order
   you may wish to override these in and a hash is easier to read and
   understand then "undef, undef, undef, 1, undef, undef, renderButton,
   undef, 0" when you mostly want default behaviors.
   
   The package provides a function called 'render', called as
   Apache::lonnavmaps::renderer->render({}).
   
   =head2 Overview of Columns
   
   The renderer will build an HTML table for the navmap and return
   it. The table is consists of several columns, and a row for each
   resource (or possibly each part). You tell the renderer how many
   columns to create and what to place in each column, optionally using
   one or more of the preparent columns, and the renderer will assemble
   the table.
   
   Any additional generally useful column types should be placed in the
   renderer code here, so anybody can use it anywhere else. Any code
   specific to the current application (such as the addition of <input>
   elements in a column) should be placed in the code of the thing using
   the renderer.
   
   At the core of the renderer is the array reference COLS (see Example
   section below for how to pass this correctly). The COLS array will
   consist of entries of one of two types of things: Either an integer
   representing one of the pre-packaged column types, or a sub reference
   that takes a resource reference, a part number, and a reference to the
   argument hash passed to the renderer, and returns a string that will
   be inserted into the HTML representation as it.
   
   The pre-packaged column names are refered to by constants in the
   Apache::lonnavmaps::renderer namespace. The following currently exist:
   
   =over 4
   
   =item * B<resource>:
   
   The general info about the resource: Link, icon for the type, etc. The
   first column in the standard nav map display. This column also accepts
   the following parameter in the renderer hash:
   
   =over 4
   
   =item * B<resource_nolink>:
   
   If true, the resource will not be linked. Default: false, resource
   will have links.
   
   =item * B<resource_part_count>:
   
   If true (default), the resource will show a part count if the full
   part list is not displayed. If false, the resource will never show a
   part count.
   
   =item * B<resource_no_folder_link>:
   
   If true, the resource's folder will not be clickable to open or close
   it. Default is false. True implies printCloseAll is false, since you
   can't close or open folders when this is on anyhow.
   
   =back
   
   =item B<communication_status>:
   
   Whether there is discussion on the resource, email for the user, or
   (lumped in here) perl errors in the execution of the problem. This is
   the second column in the main nav map.
   
   =item B<quick_status>:
   
   An icon for the status of a problem, with four possible states:
   Correct, incorrect, open, or none (not open yet, not a problem). The
   third column of the standard navmap.
   
   =item B<long_status>:
   
   A text readout of the details of the current status of the problem,
   such as "Due in 22 hours". The fourth column of the standard navmap.
   
   =back
   
   If you add any others please be sure to document them here.
   
   An example of a column renderer that will show the ID number of a
   resource, along with the part name if any:
   
    sub { 
     my ($resource, $part, $params) = @_;   
     if ($part) { return '<td>' . $resource->{ID} . ' ' . $part . '</td>'; }
     return '<td>' . $resource->{ID} . '</td>';
    }
   
   Note these functions are responsible for the TD tags, which allow them
   to override vertical and horizontal alignment, etc.
   
   =head2 Parameters
   
   Most of these parameters are only useful if you are *not* using the
   folder interface (i.e., the default first column), which is probably
   the common case. If you are using this interface, then you should be
   able to get away with just using 'cols' (to specify the columns
   shown), 'url' (necessary for the folders to link to the current screen
   correctly), and possibly 'queryString' if your app calls for it. In
   that case, maintaining the state of the folders will be done
   automatically.
   
   =over 4
   
   =item * B<iterator>:
   
   A reference to a fresh ::iterator to use from the navmaps. The
   rendering will reflect the options passed to the iterator, so you can
   use that to just render a certain part of the course, if you like. If
   one is not passed, the renderer will attempt to construct one from
   ENV{'form.filter'} and ENV{'form.condition'} information, plus the
   'iterator_map' parameter if any.
   
   =item * B<iterator_map>:
   
   If you are letting the renderer do the iterator handling, you can
   instruct the renderer to render only a particular map by passing it
   the source of the map you want to process, like
   '/res/103/jerf/navmap.course.sequence'.
   
   =item * B<navmap>:
   
   A reference to a navmap, used only if an iterator is not passed in. If
   this is necessary to make an iterator but it is not passed in, a new
   one will be constructed based on ENV info. This is useful to do basic
   error checking before passing it off to render.
   
   =item * B<r>:
   
   The standard Apache response object. This must be passed to the
   renderer or the course hash will be locked.
   
   =item * B<cols>:
   
   An array reference
   
   =item * B<showParts>:
   
   A flag. If yes (default), a line for the resource itself, and a line
   for each part will be displayed. If not, only one line for each
   resource will be displayed.
   
   =item * B<condenseParts>:
   
   A flag. If yes (default), if all parts of the problem have the same
   status and that status is Nothing Set, Correct, or Network Failure,
   then only one line will be displayed for that resource anyhow. If no,
   all parts will always be displayed. If showParts is 0, this is
   ignored.
   
   =item * B<jumpCount>:
   
   A string identifying the URL to place the anchor 'curloc' at. Default
   to no anchor at all. It is the responsibility of the renderer user to
   ensure that the #curloc is in the URL. By default, determined through
   the use of the ENV{} 'jump' information, and should normally "just
   work" correctly.
   
   =item * B<here>:
   
   A Symb identifying where to place the 'here' marker. Default empty,
   which means no marker.
   
   =item * B<indentString>:
   
   A string identifying the indentation string to use. By default, this
   is a 25 pixel whitespace image with no alt text.
   
   =item * B<queryString>:
   
   A string which will be prepended to the query string used when the
   folders are opened or closed.
   
   =item * B<url>:
   
   The url the folders will link to, which should be the current
   page. Required if the resource info column is shown.
   
   =item * B<currentJumpIndex>:
   
   Describes the currently-open row number to cause the browser to jump
   to, because the user just opened that folder. By default, pulled from
   the Jump information in the ENV{'form.*'}.
   
   =item * B<printKey>:
   
   If true, print the key that appears on the top of the standard
   navmaps. Default is false.
   
   =item * B<printCloseAll>:
   
   If true, print the "Close all folders" or "open all folders"
   links. Default is true.
   
   =item * B<filterFunc>:
   
   A function that takes the resource object as its only parameter and
   returns a true or false value. If true, the resource is displayed. If
   false, it is simply skipped in the display. By default, all resources
   are shown.
   
   =item * B<suppressNavmaps>:
   
   If true, will not display Navigate Content resources. Default to
   false.
   
   =back
   
   =head2 Additional Info
   
   In addition to the parameters you can pass to the renderer, which will
   be passed through unchange to the column renderers, the renderer will
   generate the following information which your renderer may find
   useful:
   
   If you want to know how many rows were printed, the 'counter' element
   of the hash passed into the render function will contain the
   count. You may want to check whether any resources were printed at
   all.
   
   =over 4
   
   =back
   
   =cut
   
   sub resource { return 0; }
   sub communication_status { return 1; }
   sub quick_status { return 2; }
   sub long_status { return 3; }
   
   # Data for render_resource
   
   sub render_resource {
       my ($resource, $part, $params) = @_;
   
       my $nonLinkedText = ''; # stuff after resource title not in link
   
       my $link = $params->{"resourceLink"};
       my $src = $resource->src();
       my $it = $params->{"iterator"};
       my $filter = $it->{FILTER};
   
       my $title = $resource->compTitle();
       if ($src =~ /^\/uploaded\//) {
           $nonLinkedText=$title;
           $title = '';
       }
       my $partLabel = "";
       my $newBranchText = "";
       
       # If this is a new branch, label it so
       if ($params->{'isNewBranch'}) {
           $newBranchText = "<img src='/adm/lonIcons/branch.gif' border='0' />";
       }
   
       # links to open and close the folder
       my $linkopen = "<a href='$link'>";
       my $linkclose = "</a>";
   
       # Default icon: HTML page
       my $icon = "<img src='/adm/lonIcons/html.gif' alt='' border='0' />";
       
       if ($resource->is_problem()) {
           if ($part eq "" || $params->{'condensed'}) {
               $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border="0" />';
           } else {
               $icon = $params->{'indentString'};
           }
       }
   
       # Display the correct map icon to open or shut map
       if ($resource->is_map()) {
           my $mapId = $resource->map_pc();
           my $nowOpen = !defined($filter->{$mapId});
           if ($it->{CONDITION}) {
               $nowOpen = !$nowOpen;
           }
   
           if (!$params->{'resource_no_folder_link'}) {
               $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') . '.gif';
               $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
   
               $linkopen = "<a href='" . $params->{'url'} . '?' . 
                   $params->{'queryString'} . '&filter=';
               $linkopen .= ($nowOpen xor $it->{CONDITION}) ?
                   addToFilter($filter, $mapId) :
                   removeFromFilter($filter, $mapId);
               $linkopen .= "&condition=" . $it->{CONDITION} . '&hereType='
                   . $params->{'hereType'} . '&here=' .
                   &Apache::lonnet::escape($params->{'here'}) . 
                   '&jump=' .
                   &Apache::lonnet::escape($resource->symb()) . 
                   "&folderManip=1'>";
           } else {
               # Don't allow users to manipulate folder
               $icon = 'navmap.folder.' . ($nowOpen ? 'closed' : 'open') .
                   '.nomanip.gif';
               $icon = "<img src='/adm/lonIcons/$icon' alt='' border='0' />";
   
               $linkopen = "";
               $linkclose = "";
           }
       }
   
       if ($resource->randomout()) {
           $nonLinkedText .= ' <i>(hidden)</i> ';
       }
       
       # We're done preparing and finally ready to start the rendering
       my $result = "<td align='left' valign='center'>";
   
       my $indentLevel = $params->{'indentLevel'};
       if ($newBranchText) { $indentLevel--; }
   
       # print indentation
       for (my $i = 0; $i < $indentLevel; $i++) {
           $result .= $params->{'indentString'};
       }
   
       # Decide what to display
       $result .= "$newBranchText$linkopen$icon$linkclose";
       
       my $curMarkerBegin = '';
       my $curMarkerEnd = '';
   
       # Is this the current resource?
       if (!$params->{'displayedHereMarker'} && 
           $resource->symb() eq $params->{'here'} ) {
           $curMarkerBegin = '<font color="red" size="+2">&gt; </font>';
           $curMarkerEnd = '<font color="red" size="+2">&lt;</font>';
           $params->{'displayedHereMarker'} = 1;
       }
   
       if ($resource->is_problem() && $part ne "" && 
           !$params->{'condensed'}) {
           $partLabel = " (Part $part)";
           $title = "";
       }
   
       if ($params->{'condensed'} && $resource->countParts() > 1) {
           $nonLinkedText .= ' (' . $resource->countParts() . ' parts)';
       }
   
       if (!$params->{'resource_nolink'}) {
           $result .= "  $curMarkerBegin<a href='$link'>$title$partLabel</a>$curMarkerEnd $nonLinkedText</td>";
       } else {
           $result .= "  $curMarkerBegin$title$partLabel$curMarkerEnd $nonLinkedText</td>";
       }
   
       return $result;
   }
   
   sub render_communication_status {
       my ($resource, $part, $params) = @_;
       my $discussionHTML = ""; my $feedbackHTML = ""; my $errorHTML = "";
   
       my $link = $params->{"resourceLink"};
       my $linkopen = "<a href='$link'>";
       my $linkclose = "</a>";
   
       if ($resource->hasDiscussion()) {
           $discussionHTML = $linkopen .
               '<img border="0" src="/adm/lonMisc/chat.gif" />' .
               $linkclose;
       }
       
       if ($resource->getFeedback()) {
           my $feedback = $resource->getFeedback();
           foreach (split(/\,/, $feedback)) {
               if ($_) {
                   $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
                       . &Apache::lonnet::escape($_) . '">'
                       . '<img src="/adm/lonMisc/feedback.gif" '
                       . 'border="0" /></a>';
               }
           }
       }
       
       if ($resource->getErrors()) {
           my $errors = $resource->getErrors();
           foreach (split(/,/, $errors)) {
               if ($_) {
                   $errorHTML .= '&nbsp;<a href="/adm/email?display='
                       . &Apache::lonnet::escape($_) . '">'
                       . '<img src="/adm/lonMisc/bomb.gif" '
                       . 'border="0" /></a>';
               }
           }
       }
   
       return "<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML$errorHTML&nbsp;</td>";
   
   }
   sub render_quick_status {
       my ($resource, $part, $params) = @_;
       my $result = "";
       my $firstDisplayed = !$params->{'condensed'} && 
           $params->{'multipart'} && $part eq "0";
   
       my $link = $params->{"resourceLink"};
       my $linkopen = "<a href='$link'>";
       my $linkclose = "</a>";
   
       if ($resource->is_problem() &&
           !$firstDisplayed) {
           my $icon = $statusIconMap{$resource->status($part)};
           my $alt = $iconAltTags{$icon};
           if ($icon) {
               $result .= "<td width='30' valign='center' width='50' align='right'>$linkopen<img width='25' height='25' src='/adm/lonIcons/$icon' border='0' alt='$alt' />$linkclose</td>\n";
           } else {
               $result .= "<td width='30'>&nbsp;</td>\n";
           }
       } else { # not problem, no icon
           $result .= "<td width='30'>&nbsp;</td>\n";
       }
   
       return $result;
   }
   sub render_long_status {
       my ($resource, $part, $params) = @_;
       my $result = "<td align='right' valign='center'>\n";
       my $firstDisplayed = !$params->{'condensed'} && 
           $params->{'multipart'} && $part eq "0";
                   
       my $color;
       if ($resource->is_problem()) {
           $color = $colormap{$resource->status};
           
           if (dueInLessThen24Hours($resource, $part) ||
               lastTry($resource, $part)) {
               $color = $hurryUpColor;
           }
       }
       
       if ($resource->kind() eq "res" &&
           $resource->is_problem() &&
           !$firstDisplayed) {
           if ($color) {$result .= "<font color=\"$color\"><b>"; }
           $result .= getDescription($resource, $part);
           if ($color) {$result .= "</b></font>"; }
       }
       if ($resource->is_map() && advancedUser() && $resource->randompick()) {
           $result .= '(randomly select ' . $resource->randompick() .')';
       }
       
       $result .= "&nbsp;</td>\n";
       
       return $result;
   }
   
   my @preparedColumns = (\&render_resource, \&render_communication_status,
                          \&render_quick_status, \&render_long_status);
   
   sub setDefault {
       my ($val, $default) = @_;
       if (!defined($val)) { return $default; }
       return $val;
   }
   
   sub render {
       my $args = shift;
       &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING});
       my $result = '';
   
       # Configure the renderer.
       my $cols = $args->{'cols'};
       if (!defined($cols)) {
           # no columns, no nav maps.
           return '';
       }
       my $mustCloseNavMap = 0;
       my $navmap;
       if (defined($args->{'navmap'})) {
           $navmap = $args->{'navmap'};
       }
   
       my $r = $args->{'r'};
       my $queryString = $args->{'queryString'};
       my $jump = $args->{'jump'};
       my $here = $args->{'here'};
       my $suppressNavmap = setDefault($args->{'suppressNavmap'}, 0);
       my $currentJumpDelta = 2; # change this to change how many resources are displayed
                                # before the current resource when using #current
   
       # If we were passed 'here' information, we are not rendering
       # after a folder manipulation, and we were not passed an
       # iterator, make sure we open the folders to show the "here"
       # marker
       my $filterHash = {};
       # Figure out what we're not displaying
       foreach (split(/\,/, $ENV{"form.filter"})) {
           if ($_) {
               $filterHash->{$_} = "1";
           }
       }
   
       my $condition = 0;
       if ($ENV{'form.condition'}) {
           $condition = 1;
       }
   
       if (!$ENV{'form.folderManip'} && !defined($args->{'iterator'})) {
           # Step 1: Check to see if we have a navmap
           if (!defined($navmap)) {
               $navmap = Apache::lonnavmaps::navmap->new(
                           $ENV{"request.course.fn"}.".db",
                           $ENV{"request.course.fn"}."_parms.db", 1, 1);
               $mustCloseNavMap = 1;
           }
           $navmap->init();
   
           # Step two: Locate what kind of here marker is necessary
           # Determine where the "here" marker is and where the screen jumps to.
   
           if ($ENV{'form.postsymb'}) {
               $here = $jump = $ENV{'form.postsymb'};
           } elsif ($ENV{'form.postdata'}) {
               # couldn't find a symb, is there a URL?
               my $currenturl = $ENV{'form.postdata'};
               #$currenturl=~s/^http\:\/\///;
               #$currenturl=~s/^[^\/]+//;
               
               $here = $jump = &Apache::lonnet::symbread($currenturl);
           }
   
           # Step three: Ensure the folders are open
           my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
           my $depth = 1;
           $mapIterator->next(); # discard the first BEGIN_MAP
           my $curRes = $mapIterator->next();
           my $found = 0;
           
           # We only need to do this if we need to open the maps to show the
           # current position. This will change the counter so we can't count
           # for the jump marker with this loop.
           while ($depth > 0 && !$found) {
               if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
               if ($curRes == $mapIterator->END_MAP()) { $depth--; }
               
               if (ref($curRes) && $curRes->symb() eq $here) {
                   my $mapStack = $mapIterator->getStack();
                   
                   # Ensure the parent maps are open
                   for my $map (@{$mapStack}) {
                       if ($condition) {
                           undef $filterHash->{$map->map_pc()};
                       } else {
                           $filterHash->{$map->map_pc()} = 1;
                       }
                   }
                   $found = 1;
               }
               
               $curRes = $mapIterator->next();
           }            
       }        
   
       if ( !defined($args->{'iterator'}) && $ENV{'form.folderManip'} ) { # we came from a user's manipulation of the nav page
           # If this is a click on a folder or something, we want to preserve the "here"
           # from the querystring, and get the new "jump" marker
           $here = $ENV{'form.here'};
           $jump = $ENV{'form.jump'};
       } 
       
       my $it = $args->{'iterator'};
       if (!defined($it)) {
           # Construct a default iterator based on $ENV{'form.'} information
           
           # Step 1: Check to see if we have a navmap
           if (!defined($navmap)) {
               $navmap = Apache::lonnavmaps::navmap->new($r, 
                           $ENV{"request.course.fn"}.".db",
                           $ENV{"request.course.fn"}."_parms.db", 1, 1);
               $mustCloseNavMap = 1;
           }
           # Paranoia: Make sure it's ready
           $navmap->init();
   
           # See if we're being passed a specific map
           if ($args->{'iterator_map'}) {
               my $map = $args->{'iterator_map'};
               $map = $navmap->getResourceByUrl($map);
               my $firstResource = $map->map_start();
               my $finishResource = $map->map_finish();
   
               $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
           } else {
               $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition);
           }
       }
       
       # (re-)Locate the jump point, if any
       my $mapIterator = $navmap->getIterator(undef, undef, $filterHash, 0);
       my $depth = 1;
       $mapIterator->next();
       my $curRes = $mapIterator->next();
       my $foundJump = 0;
       my $counter = 0;
       
       while ($depth > 0 && !$foundJump) {
           if ($curRes == $mapIterator->BEGIN_MAP()) { $depth++; }
           if ($curRes == $mapIterator->END_MAP()) { $depth--; }
           if (ref($curRes)) { $counter++; }
           
           if (ref($curRes) && $jump eq $curRes->symb()) {
               
               # This is why we have to use the main iterator instead of the
               # potentially faster DFS: The count has to be the same, so
               # the order has to be the same, which DFS won't give us.
               $args->{'currentJumpIndex'} = $counter;
               $foundJump = 1;
           }
           
           $curRes = $mapIterator->next();
       }
   
       my $showParts = setDefault($args->{'showParts'}, 1);
       my $condenseParts = setDefault($args->{'condenseParts'}, 1);
       # keeps track of when the current resource is found,
       # so we can back up a few and put the anchor above the
       # current resource
       my $printKey = $args->{'printKey'};
       my $printCloseAll = $args->{'printCloseAll'};
       if (!defined($printCloseAll)) { $printCloseAll = 1; }
       my $filterFunc = setDefault($args->{'filterFunc'},
                                   sub {return 1;});
       
       # Print key?
       if ($printKey) {
           $result .= '<table border="0" cellpadding="2" cellspacing="0">';
           my $date=localtime;
           $result.='<tr><td align="right" valign="bottom">Key:&nbsp;&nbsp;</td>';
           if ($navmap->{LAST_CHECK}) {
               $result .= 
                   '<img src="/adm/lonMisc/chat.gif"> New discussion since '.
                   strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                   '</td><td align="center" valign="bottom">&nbsp;&nbsp;'.
                   '<img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'.
                   '</td>'; 
           } else {
               $result .= '<td align="center" valign="bottom">&nbsp;&nbsp;'.
                   '<img src="/adm/lonMisc/chat.gif"> Discussions</td><td align="center" valign="bottom">'.
                   '&nbsp;&nbsp;<img src="/adm/lonMisc/feedback.gif"> New message (click to open)'.
                   '</td>'; 
           }
   
           $result .= '</tr></table>';
       }
   
       if ($printCloseAll && !$args->{'resource_no_folder_link'}) {
           if ($condition) {
               $result.="<a href=\"navmaps?condition=0&filter=&$queryString" .
                   "&here=" . Apache::lonnet::escape($here) .
                   "\">Close All Folders</a>";
           } else {
               $result.="<a href=\"navmaps?condition=1&filter=&$queryString" .
                   "&here=" . Apache::lonnet::escape($here) . 
                   "\">Open All Folders</a>";
           }
           $result .= "<br /><br />\n";
       }    
   
       if ($r) {
           $r->print($result);
           $r->rflush();
           $result = "";
       }
       # End parameter setting
               
       # Data
       $result .= '<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n";
       my $res = "Apache::lonnavmaps::resource";
       my %condenseStatuses =
           ( $res->NETWORK_FAILURE    => 1,
             $res->NOTHING_SET        => 1,
             $res->CORRECT            => 1 );
       my @backgroundColors = ("#FFFFFF", "#F6F6F6");
   
       # Shared variables
       $args->{'counter'} = 0; # counts the rows
       $args->{'indentLevel'} = 0;
       $args->{'isNewBranch'} = 0;
       $args->{'condensed'} = 0;    
       $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='/adm/lonIcons/whitespace1.gif' width='25' height='1' alt='' border='0' />");
       $args->{'displayedHereMarker'} = 0;
   
       my $displayedJumpMarker = 0;
       # Set up iteration.
       $depth = 1;
       $it->next(); # discard initial BEGIN_MAP
       $curRes = $it->next();
       my $now = time();
       my $in24Hours = $now + 24 * 60 * 60;
       my $rownum = 0;
   
       # export "here" marker information
       $args->{'here'} = $here;
   
       while ($depth > 0) {
           if ($curRes == $it->BEGIN_MAP()) { $depth++; }
           if ($curRes == $it->END_MAP()) { $depth--; }
   
           # Maintain indentation level.
           if ($curRes == $it->BEGIN_MAP() ||
               $curRes == $it->BEGIN_BRANCH() ) {
               $args->{'indentLevel'}++;
           }
           if ($curRes == $it->END_MAP() ||
               $curRes == $it->END_BRANCH() ) {
               $args->{'indentLevel'}--;
           }
           # Notice new branches
           if ($curRes == $it->BEGIN_BRANCH()) {
               $args->{'isNewBranch'} = 1;
           }
   
           # If this isn't an actual resource, continue on
           if (!ref($curRes)) {
               next;
           }
   
           $args->{'counter'}++;
   
           # If this has been filtered out, continue on
           if (!(&$filterFunc($curRes))) {
               $args->{'isNewBranch'} = 0; # Don't falsely remember this
               next;
           } 
   
           # If we're suppressing navmaps and this is a navmap, continue on
           if ($suppressNavmap && $curRes->src() =~ /^\/adm\/navmaps/) {
               next;
           }
   
           # Does it have multiple parts?
           $args->{'multipart'} = 0;
           $args->{'condensed'} = 0;
           my @parts;
               
           # Decide what parts to show.
           if ($curRes->is_problem() && $showParts) {
               @parts = @{$curRes->parts()};
               $args->{'multipart'} = scalar(@parts) > 1;
               
               if ($condenseParts) { # do the condensation
                   if (!$curRes->opendate("0")) {
                       @parts = ();
                       $args->{'condensed'} = 1;
                   }
                   if (!$args->{'condensed'}) {
                       # Decide whether to condense based on similarity
                       my $status = $curRes->status($parts[1]);
                       my $due = $curRes->duedate($parts[1]);
                       my $open = $curRes->opendate($parts[1]);
                       my $statusAllSame = 1;
                       my $dueAllSame = 1;
                       my $openAllSame = 1;
                       for (my $i = 2; $i < scalar(@parts); $i++) {
                           if ($curRes->status($parts[$i]) != $status){
                               $statusAllSame = 0;
                           }
                           if ($curRes->duedate($parts[$i]) != $due ) {
                               $dueAllSame = 0;
                           }
                           if ($curRes->opendate($parts[$i]) != $open) {
                               $openAllSame = 0;
                           }
                       }
                       # $*allSame is true if all the statuses were
                       # the same. Now, if they are all the same and
                       # match one of the statuses to condense, or they
                       # are all open with the same due date, or they are
                       # all OPEN_LATER with the same open date, display the
                       # status of the first non-zero part (to get the 'correct'
                       # status right, since 0 is never 'correct' or 'open').
                       if (($statusAllSame && defined($condenseStatuses{$status})) ||
                           ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                           ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
                           @parts = ();
                           $args->{'condensed'} = 1;
                       }
                       
                   }
               }
           } 
               
           # If the multipart problem was condensed, "forget" it was multipart
           if (scalar(@parts) == 1) {
               $args->{'multipart'} = 0;
           }
   
           # Now, we've decided what parts to show. Loop through them and
           # show them.
           foreach my $part ('', @parts) {
               if ($part eq '0') {
                   next;
               }
               $rownum ++;
               my $backgroundColor = $backgroundColors[$rownum % scalar(@backgroundColors)];
               
               $result .= "  <tr bgcolor='$backgroundColor'>\n";
   
               # Set up some data about the parts that the cols might want
               my $filter = $it->{FILTER};
               my $stack = $it->getStack();
               my $src = getLinkForResource($stack);
               
               my $srcHasQuestion = $src =~ /\?/;
               $args->{"resourceLink"} = $src.
                   ($srcHasQuestion?'&':'?') .
                   'symb=' . &Apache::lonnet::escape($curRes->symb());
               
               # Now, display each column.
               foreach my $col (@$cols) {
                   my $colHTML = '';
                   if (ref($col)) {
                       $colHTML .= &$col($curRes, $part, $args);
                   } else {
                       $colHTML .= &{$preparedColumns[$col]}($curRes, $part, $args);
                   }
   
                   # If this is the first column and it's time to print
                   # the anchor, do so
                   if ($col == $cols->[0] && 
                       $args->{'counter'} == $args->{'currentJumpIndex'} - 
                       $currentJumpDelta) {
                       # Jam the anchor after the <td> tag;
                       # necessary for valid HTML (which Mozilla requires)
                       $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
                       $displayedJumpMarker = 1;
                   }
                   $result .= $colHTML . "\n";
               }
               $result .= "    </tr>\n";
               $args->{'isNewBranch'} = 0;
           }
   
           if ($r && $rownum % 20 == 0) {
               $r->print($result);
               $result = "";
               $r->rflush();
           }
       } continue {
           $curRes = $it->next();
       }
       
       # Print out the part that jumps to #curloc if it exists
       # delay needed because the browser is processing the jump before
       # it finishes rendering, so it goes to the wrong place!
       # onload might be better, but this routine has no access to that.
       # On mozilla, the 0-millisecond timeout seems to prevent this;
       # it's quite likely this might fix other browsers, too, and 
       # certainly won't hurt anything.
       if ($displayedJumpMarker) {
           $result .= "<script>setTimeout(\"location += '#curloc';\", 0)</script>\n";
       }
   
       $result .= "</table>";
       
       if ($r) {
           $r->print($result);
           $result = "";
           $r->rflush();
       }
           
       if ($mustCloseNavMap) { $navmap->untieHashes(); } 
   
       return $result;
   }
   
 1;  1;
   
 package Apache::lonnavmaps::navmap;  package Apache::lonnavmaps::navmap;
   
 =pod  =pod
   
 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.  lonnavmaps provides functions and objects for dealing with the
   compiled course hashes generated when a user enters the course, the
   Apache handler for the "Navigation Map" button, and a flexible
   prepared renderer for navigation maps that are easy to use anywhere.
   
   =head1 Object: navmap
   
 =head1 navmap object: Encapsulating the compiled nav map  Encapsulating the compiled nav map
   
 navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it.  navmap is an object that encapsulates a compiled course map and
   provides a reasonable interface to it.
   
 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.  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.
   
 You must obtain resource objects through the navmap object.  You must obtain resource objects through the navmap object.
   
Line 877  You must obtain resource objects through Line 1385  You must obtain resource objects through
   
 =over 4  =over 4
   
 =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled nav map hash and parm hash given as filenames. 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.  =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions,
     genMailDiscussStatus):
   
 =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.  Binds a new navmap object to the compiled nav map hash and parm hash
   given as filenames. 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.
   
   =item * B<getIterator>(first, finish, filter, condition):
   
   See iterator documentation below.
   
 =cut  =cut
   
Line 906  sub new { Line 1428  sub new {
     $self->{NETWORK_FAILURE} = 0;      $self->{NETWORK_FAILURE} = 0;
   
     # tie the nav hash      # tie the nav hash
   
     my %navmaphash;      my %navmaphash;
       my %parmhash;
     if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},      if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE},
               &GDBM_READER(), 0640))) {                &GDBM_READER(), 0640))) {
         return undef;          return undef;
     }      }
           
     my %parmhash;  
     if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},      if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
               &GDBM_READER(), 0640)))                &GDBM_READER(), 0640)))
     {      {
         untie $self->{PARM_HASH};          untie %{$self->{PARM_HASH}};
         return undef;          return undef;
     }      }
   
     # Now copy the hashes for speed (?)      $self->{NAV_HASH} = \%navmaphash;
     my %realnav; my %realparm;      $self->{PARM_HASH} = \%parmhash;
     foreach (%navmaphash) { $realnav{$_} = $navmaphash{$_}; }      $self->{INITED} = 0;
     foreach (%parmhash) { $realparm{$_} = $navmaphash{$_}; }  
     $self->{NAV_HASH} = \%realnav;  
     $self->{PARM_HASH} = \%realparm;  
   
     bless($self);      bless($self);
     $self->untieHashes();  
                   
     return $self;      return $self;
 }  }
   
 sub init {  sub init {
     my $self = shift;      my $self = shift;
       if ($self->{INITED}) { return; }
   
     # If the course opt hash and the user opt hash should be generated,      # If the course opt hash and the user opt hash should be generated,
     # generate them      # generate them
Line 954  sub init { Line 1474  sub init {
             unless ((time-$courserdatas{$cid.'.last_cache'})<240) {              unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
                 my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.                  my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
                                                  ':resourcedata',$chome);                                                   ':resourcedata',$chome);
                 if ($reply!~/^error\:/) {                  # Check for network failure
                   if ( $reply =~ /no.such.host/i || $reply =~ /con_lost/i) {
                       $self->{NETWORK_FAILURE} = 1;
                   } elsif ($reply!~/^error\:/) {
                     $courserdatas{$cid}=$reply;                      $courserdatas{$cid}=$reply;
                     $courserdatas{$cid.'.last_cache'}=time;                      $courserdatas{$cid.'.last_cache'}=time;
                 }                  }
                 # check to see if network failed  
                 elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i )  
                 {  
                     $self->{NETWORK_FAILURE} = 1;  
                 }  
             }              }
             foreach (split(/\&/,$courserdatas{$cid})) {              foreach (split(/\&/,$courserdatas{$cid})) {
                 my ($name,$value)=split(/\=/,$_);                  my ($name,$value)=split(/\=/,$_);
Line 999  sub init { Line 1517  sub init {
         my %emailstatus = &Apache::lonnet::dump('email_status');          my %emailstatus = &Apache::lonnet::dump('email_status');
         my $logoutTime = $emailstatus{'logout'};          my $logoutTime = $emailstatus{'logout'};
         my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};          my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}};
         $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ?          $self->{LAST_CHECK} = ($courseLeaveTime < $logoutTime ?
                                $courseLeaveTime : $logoutTime);                                 $courseLeaveTime : $logoutTime);
         my %discussiontime = &Apache::lonnet::dump('discussiontimes',           my %discussiontime = &Apache::lonnet::dump('discussiontimes', 
                                                    $cdom, $cnum);                                                     $cdom, $cnum);
Line 1040  sub init { Line 1558  sub init {
     }          }    
   
     $self->{PARM_CACHE} = {};      $self->{PARM_CACHE} = {};
       $self->{INITED} = 1;
 }  }
   
 # Internal function: Takes a key to look up in the nav hash and implements internal  # Internal function: Takes a key to look up in the nav hash and implements internal
Line 1069  sub getIterator { Line 1588  sub getIterator {
 # unties the hash when done  # unties the hash when done
 sub untieHashes {  sub untieHashes {
     my $self = shift;      my $self = shift;
     untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});      untie %{$self->{NAV_HASH}};
     untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});      untie %{$self->{PARM_HASH}};
     $self->{HASH_TIED} = 0;  
 }  
   
 # when the object is destroyed, be sure to untie all the hashes we tied.  
 sub DESTROY {  
     my $self = shift;  
     $self->untieHashes();  
 }  }
   
 # Private function: Does the given resource (as a symb string) have  # Private method: Does the given resource (as a symb string) have
 # current discussion? Returns 0 if chat/mail data not extracted.  # current discussion? Returns 0 if chat/mail data not extracted.
 sub hasDiscussion {  sub hasDiscussion {
     my $self = shift;      my $self = shift;
     my $symb = shift;      my $symb = shift;
     if (!defined($self->{DISCUSSION_TIME})) { return 0; }      if (!defined($self->{DISCUSSION_TIME})) { return 0; }
   
       #return defined($self->{DISCUSSION_TIME}->{$symb});
     return $self->{DISCUSSION_TIME}->{$symb} >      return $self->{DISCUSSION_TIME}->{$symb} >
            $self->{LAST_CHECK};             $self->{LAST_CHECK};
 }  }
   
 # Private function: Does the given resource (as a symb string) have  # Private method: Does the given resource (as a symb string) have
 # current feedback? Returns the string in the feedback hash, which  # current feedback? Returns the string in the feedback hash, which
 # will be false if it does not exist.  # will be false if it does not exist.
 sub getFeedback {   sub getFeedback { 
Line 1103  sub getFeedback { Line 1616  sub getFeedback {
     return $self->{FEEDBACK}->{$symb};      return $self->{FEEDBACK}->{$symb};
 }  }
   
   # Private method: Get the errors for that resource (by source).
   sub getErrors { 
       my $self = shift;
       my $src = shift;
       
       if (!defined($self->{ERROR_MSG})) { return ""; }
       return $self->{ERROR_MSG}->{$src};
   }
   
 =pod  =pod
   
 =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.  =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.
   
 =cut  =cut
   
Line 1124  sub getById { Line 1651  sub getById {
     }      }
   
     # resource handles inserting itself into cache.      # resource handles inserting itself into cache.
     return Apache::lonnavmaps::resource->new($self, $id);      # Not clear why the quotes are necessary, but as of this
       # writing it doesn't work without them.
       return "Apache::lonnavmaps::resource"->new($self, $id);
   }
   
   sub getBySymb {
       my $self = shift;
       my $symb = shift;
       my ($mapUrl, $id, $filename) = split (/___/, $symb);
       my $map = $self->getResourceByUrl($mapUrl);
       return $self->getById($map->map_pc() . '.' . $id);
 }  }
   
 =pod  =pod
   
 =item * B<firstResource>(): Returns a resource object reference corresponding to the first resource in the navmap.  =item * B<firstResource>():
   
   Returns a resource object reference corresponding to the first
   resource in the navmap.
   
 =cut  =cut
   
Line 1142  sub firstResource { Line 1682  sub firstResource {
   
 =pod  =pod
   
 =item * B<finishResource>(): Returns a resource object reference corresponding to the last resource in the navmap.  =item * B<finishResource>():
   
   Returns a resource object reference corresponding to the last resource
   in the navmap.
   
 =cut  =cut
   
Line 1239  sub parmval_real { Line 1782  sub parmval_real {
     my ($space,@qualifier)=split(/\./,$rwhat);      my ($space,@qualifier)=split(/\./,$rwhat);
     my $qualifier=join('.',@qualifier);      my $qualifier=join('.',@qualifier);
     unless ($space eq '0') {      unless ($space eq '0') {
         my ($part,$id)=split(/\_/,$space);   my @parts=split(/_/,$space);
         if ($id) {   my $id=pop(@parts);
             my $partgeneral=$self->parmval($part.".$qualifier",$symb);   my $part=join('_',@parts);
             if (defined($partgeneral)) { return $partgeneral; }   if ($part eq '') { $part='0'; }
         } else {   my $partgeneral=$self->parmval($part.".$qualifier",$symb);
             my $resourcegeneral=$self->parmval("0.$qualifier",$symb);   if (defined($partgeneral)) { return $partgeneral; }
             if (defined($resourcegeneral)) { return $resourcegeneral; }  
         }  
     }      }
     return '';      return '';
 }  }
   
   =pod
   
   =item * B<getResourceByUrl>(url):
   
   Retrieves a resource object by URL of the resource. If passed a
   resource object, it will simply return it, so it is safe to use this
   method in code like "$res = $navmap->getResourceByUrl($res)", if
   you're not sure if $res is already an object, or just a URL. If the
   resource appears multiple times in the course, only the first instance
   will be returned. As a result, this is probably useful only for maps.
   
   =item * B<retrieveResources>(map, filterFunc, recursive, bailout):
   
   The map is a specification of a map to retreive the resources from,
   either as a url or as an object. The filterFunc is a reference to a
   function that takes a resource object as its one argument and returns
   true if the resource should be included, or false if it should not
   be. If recursive is true, the map will be recursively examined,
   otherwise it will not be. If bailout is true, the function will return
   as soon as it finds a resource, if false it will finish. By default,
   the map is the top-level map of the course, filterFunc is a function
   that always returns 1, recursive is true, bailout is false. The
   resources will be returned in a list containing the resource objects
   for the corresponding resources, with B<no structure information> in
   the list; regardless of branching, recursion, etc., it will be a flat
   list.
   
   Thus, this is suitable for cases where you don't want the structure,
   just a list of all resources. It is also suitable for finding out how
   many resources match a given description; for this use, if all you
   want to know is if I<any> resources match the description, the bailout
   parameter will allow you to avoid potentially expensive enumeration of
   all matching resources.
   
   =item * B<hasResources>(map, filterFunc, recursive):
   
   Convience method for
   
    scalar(retrieveResources($map, $filterFunc, $recursive, 1)) > 0
   
   which will tell whether the map has resources matching the description
   in the filter function.
   
   =cut
   
   sub getResourceByUrl {
       my $self = shift;
       my $resUrl = shift;
   
       if (ref($resUrl)) { return $resUrl; }
   
       $resUrl = &Apache::lonnet::clutter($resUrl);
       my $resId = $self->{NAV_HASH}->{'ids_' . $resUrl};
       if ($resId =~ /,/) {
           $resId = (split (/,/, $resId))[0];
       }
       if (!$resId) { return ''; }
       return $self->getById($resId);
   }
   
   sub retrieveResources {
       my $self = shift;
       my $map = shift;
       my $filterFunc = shift;
       if (!defined ($filterFunc)) {
           $filterFunc = sub {return 1;};
       }
       my $recursive = shift;
       if (!defined($recursive)) { $recursive = 1; }
       my $bailout = shift;
       if (!defined($bailout)) { $bailout = 0; }
   
       # Create the necessary iterator.
       if (!ref($map)) { # assume it's a url of a map.
           $map = $self->getResourceByUrl($map);
       }
   
       # Check the map's validity.
       if (!$map || !$map->is_map()) {
           # Oh, to throw an exception.... how I'd love that!
           return ();
       }
   
       # Get an iterator.
       my $it = $self->getIterator($map->map_start(), $map->map_finish(),
                                   !$recursive);
   
       my @resources = ();
   
       # Run down the iterator and collect the resources.
       my $depth = 1;
       $it->next();
       my $curRes = $it->next();
   
       while ($depth > 0) {
           if ($curRes == $it->BEGIN_MAP()) {
               $depth++;
           }
           if ($curRes == $it->END_MAP()) {
               $depth--;
           }
           
           if (ref($curRes)) {
               if (!&$filterFunc($curRes)) {
                   next;
               }
   
               push @resources, $curRes;
   
               if ($bailout) {
                   return @resources;
               }
           }
   
           $curRes = $it->next();
       }
   
       return @resources;
   }
   
   sub hasResource {
       my $self = shift;
       my $map = shift;
       my $filterFunc = shift;
       my $recursive = shift;
       
       return scalar($self->retrieveResources($map, $filterFunc, $recursive, 1)) > 0;
   }
   
 1;  1;
   
Line 1260  package Apache::lonnavmaps::iterator; Line 1929  package Apache::lonnavmaps::iterator;
   
 =back  =back
   
 =head1 navmap Iterator  =head1 Object: navmap Iterator
   
 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.  
   
 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:  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.
   
   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:
   
 C<my $resourceIterator = $navmap-E<gt>getIterator();>  C<my $resourceIterator = $navmap-E<gt>getIterator();>
   
Line 1276  getIterator behaves as follows: Line 1949  getIterator behaves as follows:
   
 =over 4  =over 4
   
 =item * B<getIterator>(firstResource, finishResource, filterHash, condition): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0.  =item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
   
 Thus, by default, only top-level resources will be shown. Change the condition to a 1 without changing the hash, and all resources will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively suppress parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively add parts of the nav map. See the handler code for examples.  All parameters are optional. firstResource is a resource reference
   corresponding to where the iterator should start. It defaults to
 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:  navmap->firstResource() for the corresponding nav map. finishResource
   corresponds to where you want the iterator to end, defaulting to
   navmap->finishResource(). filterHash is a hash used as a set
   containing strings representing the resource IDs, defaulting to
   empty. Condition is a 1 or 0 that sets what to do with the filter
   hash: If a 0, then only resource that exist IN the filterHash will be
   recursed on. If it is a 1, only resources NOT in the filterHash will
   be recursed on. Defaults to 0. forceTop is a boolean value. If it is
   false (default), the iterator will only return the first level of map
   that is not just a single, 'redirecting' map. If true, the iterator
   will return all information, starting with the top-level map,
   regardless of content. returnTopMap, if true (default false), will
   cause the iterator to return the top-level map object (resource 0.0)
   before anything else.
   
   Thus, by default, only top-level resources will be shown. Change the
   condition to a 1 without changing the hash, and all resources will be
   shown. Changing the condition to 1 and including some values in the
   hash will allow you to selectively suppress parts of the navmap, while
   leaving it on 0 and adding things to the hash will allow you to
   selectively add parts of the nav map. See the handler code for
   examples.
   
   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:
   
 =over 4  =over 4
   
 =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.  =item * BEGIN_MAP:
   
   A new map is being recursed into. This is returned I<after> the map
   resource itself is returned.
   
   =item * END_MAP:
   
   The map is now done.
   
   =item * BEGIN_BRANCH:
   
 =item * END_MAP: The map is now done.  A branch is now starting. The next resource returned will be the first
   in that branch.
   
 =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.  =item * END_BRANCH:
   
 =item * END_BRANCH: The branch is now done.  The branch is now done.
   
 =back  =back
   
 The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.  The tokens are retreivable via methods on the iterator object, i.e.,
   $iterator->END_MAP.
   
   Maps can contain empty resources. The iterator will automatically skip
   over such resources, but will still treat the structure
   correctly. Thus, a complicated map with several branches, but
   consisting entirely of empty resources except for one beginning or
   ending resource, will cause a lot of BRANCH_STARTs and BRANCH_ENDs,
   but only one resource will be returned.
   
 =back  =back
   
Line 1346  sub new { Line 2062  sub new {
     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
     $self->{CONDITION} = shift;      $self->{CONDITION} = shift;
   
       # Do we want to automatically follow "redirection" maps?
       $self->{FORCE_TOP} = shift;
   
       # Do we want to return the top-level map object (resource 0.0)?
       $self->{RETURN_0} = shift;
       # have we done that yet?
       $self->{HAVE_RETURNED_0} = 0;
   
     # Now, we need to pre-process the map, by walking forward and backward      # Now, we need to pre-process the map, by walking forward and backward
     # over the parts of the map we're going to look at.      # over the parts of the map we're going to look at.
   
Line 1361  sub new { Line 2085  sub new {
   
     my $maxDepth = 0; # tracks max depth      my $maxDepth = 0; # tracks max depth
   
       # If there is only one resource in this map, and it's a map, we
       # want to remember that, so the user can ask for the first map
       # that isn't just a redirector.
       my $resource; my $resourceCount = 0;
   
     # **1**      # **1**
   
     foreach my $pass (@iterations) {      foreach my $pass (@iterations) {
Line 1384  sub new { Line 2113  sub new {
             if ($curRes == $iterator->END_MAP()) { $depth--; }              if ($curRes == $iterator->END_MAP()) { $depth--; }
                   
             if (ref($curRes)) {              if (ref($curRes)) {
                   # If there's only one resource, this will save it
                   # we have to filter empty resources from consideration here,
                   # or even "empty", redirecting maps have two (start & finish)
                   # or three (start, finish, plus redirector)
                   if($direction == FORWARD && $curRes->src()) { 
                       $resource = $curRes; $resourceCount++; 
                   }
                 my $resultingVal = $curRes->{DATA}->{$valName};                  my $resultingVal = $curRes->{DATA}->{$valName};
                 my $nextResources = $curRes->$nextResourceMethod();                  my $nextResources = $curRes->$nextResourceMethod();
                 my $resourceCount = scalar(@{$nextResources});                  my $nextCount = scalar(@{$nextResources});
   
                 if ($resourceCount == 1) { # **3**                  if ($nextCount == 1) { # **3**
                     my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;                      my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999;
                     $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);                      $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
                 }                  }
                                   
                 if ($resourceCount > 1) { # **4**                  if ($nextCount > 1) { # **4**
                     foreach my $res (@{$nextResources}) {                      foreach my $res (@{$nextResources}) {
                         my $current = $res->{DATA}->{$valName} || 999999999;                          my $current = $res->{DATA}->{$valName} || 999999999;
                         $res->{DATA}->{$valName} = min($current, $resultingVal + 1);                          $res->{DATA}->{$valName} = min($current, $resultingVal + 1);
Line 1413  sub new { Line 2149  sub new {
         }          }
     }      }
   
       # Check: Was this only one resource, a map?
       if ($resourceCount == 1 && $resource->is_map() && !$self->{FORCE_TOP}) { 
           my $firstResource = $resource->map_start();
           my $finishResource = $resource->map_finish();
           return 
               Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource,
                                                 $finishResource, $self->{FILTER},
                                                 $self->{ALREADY_SEEN}, 
                                                 $self->{CONDITION}, 0);
           
       }
   
     # Set up some bookkeeping information.      # Set up some bookkeeping information.
     $self->{CURRENT_DEPTH} = 0;      $self->{CURRENT_DEPTH} = 0;
     $self->{MAX_DEPTH} = $maxDepth;      $self->{MAX_DEPTH} = $maxDepth;
Line 1435  sub new { Line 2183  sub new {
 sub next {  sub next {
     my $self = shift;      my $self = shift;
   
       # If we want to return the top-level map object, and haven't yet,
       # do so.
       if ($self->{RETURN_0} && !$self->{HAVE_RETURNED_0}) {
           $self->{HAVE_RETURNED_0} = 1;
           return $self->{NAV_MAP}->getById('0.0');
       }
   
     if ($self->{RECURSIVE_ITERATOR_FLAG}) {      if ($self->{RECURSIVE_ITERATOR_FLAG}) {
         # grab the next from the recursive iterator           # grab the next from the recursive iterator 
         my $next = $self->{RECURSIVE_ITERATOR}->next();          my $next = $self->{RECURSIVE_ITERATOR}->next();
Line 1562  sub next { Line 2317  sub next {
                                               $self->{ALREADY_SEEN}, $self->{CONDITION});                                                $self->{ALREADY_SEEN}, $self->{CONDITION});
     }      }
   
       # If this is a blank resource, don't actually return it.
       # Should you ever find you need it, make sure to add an option to the code
       #  that you can use; other things depend on this behavior.
       my $browsePriv = $self->{HERE}->browsePriv();
       if (!$self->{HERE}->src() || 
           (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
           return $self->next();
       }
   
     return $self->{HERE};      return $self->{HERE};
   
 }  }
   
 =pod  =pod
   
 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).  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).
   
 =cut  =cut
   
Line 1608  package Apache::lonnavmaps::DFSiterator; Line 2378  package Apache::lonnavmaps::DFSiterator;
 #  but this might as well be left seperate, since it is possible some other  #  but this might as well be left seperate, since it is possible some other
 #  use might be found for it. - Jeremy  #  use might be found for it. - Jeremy
   
   # Unlike the main iterator, this DOES return all resources, even blank ones.
   #  The main iterator needs them to correctly preprocess the map.
   
 sub BEGIN_MAP { return 1; }    # begining of a new map  sub BEGIN_MAP { return 1; }    # begining of a new map
 sub END_MAP { return 2; }      # end of the map  sub END_MAP { return 2; }      # end of the map
 sub FORWARD { return 1; }      # go forward  sub FORWARD { return 1; }      # go forward
Line 1639  sub new { Line 2412  sub new {
   
     # A hash, used as a set, of resource already seen      # A hash, used as a set, of resource already seen
     $self->{ALREADY_SEEN} = shift;      $self->{ALREADY_SEEN} = shift;
     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };       if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
     $self->{CONDITION} = shift;      $self->{CONDITION} = shift;
     $self->{DIRECTION} = shift || FORWARD();      $self->{DIRECTION} = shift || FORWARD();
   
Line 1758  use Apache::lonnet; Line 2531  use Apache::lonnet;
   
 =head1 Object: resource  =head1 Object: resource
   
 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.  A resource object encapsulates a resource in a resource map, allowing
   easy manipulation of the resource, querying the properties of the
 A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object.  resource (including user properties), and represents a reference that
   can be used as the canonical representation of the resource by
 You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource.  lonnavmap clients like renderers.
   
   A resource only makes sense in the context of a navmap, as some of the
   data is stored in the navmap object.
   
   You will probably never need to instantiate this object directly. Use
   Apache::lonnavmaps::navmap, and use the "start" method to obtain the
   starting resource.
   
 =head2 Public Members  =head2 Public Members
   
 resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash.  resource objects have a hash called DATA ($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.
   
 =head2 Methods  =head2 Methods
   
 =over 4  =over 4
   
 =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. Very rarely, if ever, called directly. Use the nav map->getByID() method.  =item * B<new>($navmapRef, $idString):
   
   The first arg is a reference to the parent navmap object. The second
   is the idString of the resource itself. Very rarely, if ever, called
   directly. Use the nav map->getByID() method.
   
 =back  =back
   
Line 1815  sub navHash { Line 2602  sub navHash {
   
 B<Metadata Retreival>  B<Metadata Retreival>
   
 These are methods that help you retrieve metadata about the resource: Method names are based on the fields in the compiled course representation.  These are methods that help you retrieve metadata about the resource:
   Method names are based on the fields in the compiled course
   representation.
   
 =over 4  =over 4
   
 =item * B<compTitle>: Returns a "composite title", that is equal to $res->title() if the resource has a title, and is otherwise the last part of the URL (e.g., "problem.problem").  =item * B<compTitle>:
   
 =item * B<ext>: Returns true if the resource is external.  Returns a "composite title", that is equal to $res->title() if the
   resource has a title, and is otherwise the last part of the URL (e.g.,
   "problem.problem").
   
 =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)  =item * B<ext>:
   
 =item * B<kind>: Returns the kind of the resource from the compiled nav map.  Returns true if the resource is external.
   
 =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. In other words, this is usually false.  =item * B<goesto>:
   
 =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)  Returns the "goesto" value from the compiled nav map. (It is likely
   you want to use B<getNext> instead.)
   
 =item * B<src>: Returns the source for the resource.  =item * B<kind>:
   
 =item * B<symb>: Returns the symb for the resource.  Returns the kind of the resource from the compiled nav map.
   
 =item * B<title>: Returns the title of the resource.  =item * B<randomout>:
   
 =item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)  Returns true if this resource was chosen to NOT be shown to the user
   by the random map selection feature. In other words, this is usually
   false.
   
   =item * B<randompick>:
   
   Returns true for a map if the randompick feature is being used on the
   map. (?)
   
   =item * B<src>:
   
   Returns the source for the resource.
   
   =item * B<symb>:
   
   Returns the symb for the resource.
   
   =item * B<title>:
   
   Returns the title of the resource.
   
   =item * B<to>:
   
   Returns the "to" value from the compiled nav map. (It is likely you
   want to use B<getNext> instead.)
   
 =back  =back
   
Line 1873  sub to { my $self=shift; return $self->n Line 2689  sub to { my $self=shift; return $self->n
 sub compTitle {  sub compTitle {
     my $self = shift;      my $self = shift;
     my $title = $self->title();      my $title = $self->title();
       $title=~s/\&colon\;/\:/gs;
     if (!$title) {      if (!$title) {
         $title = $self->src();          $title = $self->src();
         $title = substr($title, rindex($title, '/') + 1);          $title = substr($title, rindex($title, '/') + 1);
Line 1887  These methods are shortcuts to deciding Line 2704  These methods are shortcuts to deciding
   
 =over 4  =over 4
   
 =item * B<is_map>: Returns true if the resource is a map type.  =item * B<is_map>:
   
 =item * B<is_problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field; might need more to work correctly.)  Returns true if the resource is a map type.
   
 =item * B<is_page>: Returns true if the resource is a page.  =item * B<is_problem>:
   
 =item * B<is_problem>: Returns true if the resource is a problem.  Returns true if the resource is a problem type, false
   otherwise. (Looks at the extension on the src field; might need more
   to work correctly.)
   
 =item * B<is_sequence>: Returns true if the resource is a sequence.  =item * B<is_page>:
   
   Returns true if the resource is a page.
   
   =item * B<is_sequence>:
   
   Returns true if the resource is a sequence.
   
 =back  =back
   
Line 1936  sub parmval { Line 2761  sub parmval {
   
 B<Map Methods>  B<Map Methods>
   
 These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).  These methods are useful for getting information about the map
   properties of the resource, if the resource is a map (B<is_map>).
   
 =over 4  =over 4
   
 =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.  =item * B<map_finish>:
   
   Returns a reference to a resource object corresponding to the finish
   resource of the map.
   
   =item * B<map_pc>:
   
 =item * B<map_pc>: Returns the pc value of the map, which is the first number that appears in the resource ID of the resources in the map, and is the number that appears around the middle of the symbs of the resources in that map.  Returns the pc value of the map, which is the first number that
   appears in the resource ID of the resources in the map, and is the
   number that appears around the middle of the symbs of the resources in
   that map.
   
 =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.  =item * B<map_start>:
   
 =item * B<map_type>: Returns a string with the type of the map in it.  Returns a reference to a resource object corresponding to the start
   resource of the map.
   
   =item * B<map_type>:
   
   Returns a string with the type of the map in it.
   
 =back  =back
   
Line 1955  These methods are useful for getting inf Line 2794  These methods are useful for getting inf
 sub map_finish {  sub map_finish {
     my $self = shift;      my $self = shift;
     my $src = $self->src();      my $src = $self->src();
       $src = Apache::lonnet::clutter($src);
     my $res = $self->navHash("map_finish_$src", 0);      my $res = $self->navHash("map_finish_$src", 0);
     $res = $self->{NAV_MAP}->getById($res);      $res = $self->{NAV_MAP}->getById($res);
     return $res;      return $res;
Line 1967  sub map_pc { Line 2807  sub map_pc {
 sub map_start {  sub map_start {
     my $self = shift;      my $self = shift;
     my $src = $self->src();      my $src = $self->src();
       $src = Apache::lonnet::clutter($src);
     my $res = $self->navHash("map_start_$src", 0);      my $res = $self->navHash("map_start_$src", 0);
     $res = $self->{NAV_MAP}->getById($res);      $res = $self->{NAV_MAP}->getById($res);
     return $res;      return $res;
Line 1993  sub map_type { Line 2834  sub map_type {
   
 =head2 Resource Parameters  =head2 Resource Parameters
   
 In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to part "0", but can be directed to another part by passing the part as the parameter.  In order to use the resource parameters correctly, the nav map must
   have been instantiated with genCourseAndUserOptions set to true, so
 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.)  the courseopt and useropt is read correctly. Then, you can call these
   functions to get the relevant parameters for the resource. Each
   function defaults to part "0", but can be directed to another part by
   passing the part as the parameter.
   
   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 will not have to update
   their code.)
   
 =over 4  =over 4
   
 =item * B<acc>: Get the Client IP/Name Access Control information.  =item * B<acc>:
   
   Get the Client IP/Name Access Control information.
   
   =item * B<answerdate>:
   
 =item * B<answerdate>: Get the answer-reveal date for the problem.  Get the answer-reveal date for the problem.
   
 =item * B<duedate>: Get the due date for the problem.  =item * B<duedate>:
   
 =item * B<tries>: Get the number of tries the student has used on the problem.  Get the due date for the problem.
   
 =item * B<maxtries>: Get the number of max tries allowed.  =item * B<tries>:
   
 =item * B<opendate>: Get the open date for the problem.  Get the number of tries the student has used on the problem.
   
 =item * B<sig>: Get the significant figures setting.  =item * B<maxtries>:
   
 =item * B<tol>: Get the tolerance for the problem.  Get the number of max tries allowed.
   
 =item * B<tries>: Get the number of tries the user has already used on the problem.  =item * B<opendate>:
   
 =item * B<type>: Get the question type for the problem.  Get the open date for the problem.
   
 =item * B<weight>: Get the weight for the problem.  =item * B<sig>:
   
   Get the significant figures setting.
   
   =item * B<tol>:
   
   Get the tolerance for the problem.
   
   =item * B<tries>:
   
   Get the number of tries the user has already used on the problem.
   
   =item * B<type>:
   
   Get the question type for the problem.
   
   =item * B<weight>:
   
   Get the weight for the problem.
   
 =back  =back
   
Line 2110  Misc. functions for the resource. Line 2982  Misc. functions for the resource.
   
 =over 4  =over 4
   
 =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.  =item * B<hasDiscussion>:
   
 =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:  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.
   
   =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:
   
  for (split(/\,/, $res->getFeedback())) {   for (split(/\,/, $res->getFeedback())) {
     my $link = &Apache::lonnet::escape($_);      my $link = &Apache::lonnet::escape($_);
Line 2129  sub hasDiscussion { Line 3010  sub hasDiscussion {
   
 sub getFeedback {  sub getFeedback {
     my $self = shift;      my $self = shift;
     return $self->{NAV_MAP}->getFeedback($self->src());      my $source = $self->src();
       if ($source =~ /^\/res\//) { $source = substr $source, 5; }
       return $self->{NAV_MAP}->getFeedback($source);
   }
   
   sub getErrors {
       my $self = shift;
       my $source = $self->src();
       if ($source =~ /^\/res\//) { $source = substr $source, 5; }
       return $self->{NAV_MAP}->getErrors($source);
 }  }
   
 =pod  =pod
   
 =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. Filtering part 0 if you want it is up to you.)  =item * B<parts>():
   
 =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0. Thus, B<parts> may return an array with fewer parts in it then countParts might lead you to believe.  Returns a list reference containing sorted strings corresponding to
   each part of the problem. To count the number of parts, use the list
   in a scalar context, and subtract one if greater than two. (One part
   problems have a part 0. Multi-parts have a part 0, plus a part for
   each part. Filtering part 0 if you want it is up to you.)
   
   =item * B<countParts>():
   
   Returns the number of parts of the problem a student can answer. Thus,
   for single part problems, returns 1. For multipart, it returns the
   number of parts in the problem, not including psuedo-part 0. Thus,
   B<parts> may return an array with fewer parts in it then countParts
   might lead you to believe.
   
 =back  =back
   
Line 2155  sub countParts { Line 3057  sub countParts {
     my $self = shift;      my $self = shift;
           
     my $parts = $self->parts();      my $parts = $self->parts();
       my $delta = 0;
       for my $part (@$parts) {
           if ($part eq '0') { $delta--; }
       }
   
     if ($self->{RESOURCE_ERROR}) {      if ($self->{RESOURCE_ERROR}) {
         return 0;          return 0;
     }      }
   
     if (scalar(@{$parts}) < 2) { return 1;}      return scalar(@{$parts}) + $delta;
   
     return scalar(@{$parts}) - 1;  
 }  }
   
 # Private function: Extracts the parts information and saves it  # Private function: Extracts the parts information and saves it
 sub extractParts {   sub extractParts { 
     my $self = shift;      my $self = shift;
           
     return if ($self->{PARTS});      return if (defined($self->{PARTS}));
     return if ($self->ext);      return if ($self->ext);
   
     $self->{PARTS} = [];      $self->{PARTS} = [];
   
       my %parts;
   
     # Retrieve part count, if this is a problem      # Retrieve part count, if this is a problem
     if ($self->is_problem()) {      if ($self->is_problem()) {
         my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');          my $metadata = &Apache::lonnet::metadata($self->src(), 'packages');
         if (!$metadata) {          if (!$metadata) {
             $self->{RESOURCE_ERROR} = 1;              $self->{RESOURCE_ERROR} = 1;
             $self->{PARTS} = [];              $self->{PARTS} = [];
             return;              return;
         }          }
           
         foreach (split(/\,/,$metadata)) {          foreach (split(/\,/,$metadata)) {
             if ($_ =~ /^parameter\_(.*)\_opendate$/) {              if ($_ =~ /^part_(.*)$/) {
                 push @{$self->{PARTS}}, $1;                  my $part = $1;
                   # This floods the logs
                   #if (defined($parts{$part})) {
                   #    Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
                   #  }
   
                   # check to see if part is turned off.
   
                   if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
                       $parts{$part} = 1;
                   }
             }              }
         }          }
                   
                   
         # Is this possible to do in one line? - Jeremy          my @sortedParts = sort keys %parts;
         my @sortedParts = sort @{$self->{PARTS}};  
         $self->{PARTS} = \@sortedParts;          $self->{PARTS} = \@sortedParts;
     }      }
   
Line 2202  sub extractParts { Line 3116  sub extractParts {
   
 =head2 Resource Status  =head2 Resource Status
   
 Problem resources have status information, reflecting their various dates and completion statuses.   Problem resources have status information, reflecting their various
   dates and completion statuses.
   
 There are two aspects to the status: the date-related information and the completion information.  There are two aspects to the status: the date-related information and
   the completion information.
   
 Idiomatic usage of these two methods would probably look something like  Idiomatic usage of these two methods would probably look something
   like
   
  foreach ($resource->parts()) {   foreach ($resource->parts()) {
     my $dateStatus = $resource->getDateStatus($_);      my $dateStatus = $resource->getDateStatus($_);
Line 2219  Idiomatic usage of these two methods wou Line 3136  Idiomatic usage of these two methods wou
     ... use it here ...      ... use it here ...
  }   }
   
 Which you use depends on exactly what you are looking for. The status() function has been optimized for the nav maps display and may not precisely match what you need elsewhere.  Which you use depends on exactly what you are looking for. The
   status() function has been optimized for the nav maps display and may
   not precisely match what you need elsewhere.
   
 The symbolic constants shown below can be accessed through the resource object: $res->OPEN.  The symbolic constants shown below can be accessed through the
   resource object: C<$res->OPEN>.
   
 =over 4  =over 4
   
 =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:  =item * B<getDateStatus>($part):
   
   ($part defaults to 0). A convenience function that returns a symbolic
   constant telling you about the date status of the part. The possible
   return values are:
   
 =back  =back
   
Line 2233  B<Date Codes> Line 3157  B<Date Codes>
   
 =over 4  =over 4
   
 =item * B<OPEN_LATER>: The problem will be opened later.  =item * B<OPEN_LATER>:
   
 =item * B<OPEN>: Open and not yet due.  The problem will be opened later.
   
   =item * B<OPEN>:
   
 =item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived.  Open and not yet due.
   
 =item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set.  
   
 =item * B<ANSWER_OPEN>: The answer date is here.  =item * B<PAST_DUE_ANSWER_LATER>:
   
 =item * B<NETWORK_FAILURE>: The information is unknown due to network failure.  The due date has passed, but the answer date has not yet arrived.
   
   =item * B<PAST_DUE_NO_ANSWER>:
   
   The due date has passed and there is no answer opening date set.
   
   =item * B<ANSWER_OPEN>:
   
   The answer date is here.
   
   =item * B<NETWORK_FAILURE>:
   
   The information is unknown due to network failure.
   
 =back  =back
   
Line 2298  B<> Line 3234  B<>
   
 =over 4  =over 4
   
 =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:  =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:
   
 =back   =back
   
 B<Completion Codes>  B<Completion Codes>
   
 =over 4  =over 4
   
 =item * B<NOT_ATTEMPTED>: Has not been attempted at all.  =item * B<NOT_ATTEMPTED>:
   
   Has not been attempted at all.
   
   =item * B<INCORRECT>:
   
 =item * B<INCORRECT>: Attempted, but wrong by student.  Attempted, but wrong by student.
   
 =item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override.  =item * B<INCORRECT_BY_OVERRIDE>:
   
 =item * B<CORRECT>: Correct or correct by instructor.  Attempted, but wrong by instructor override.
   
 =item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override.  =item * B<CORRECT>:
   
 =item * B<EXCUSED>: Excused. Not yet implemented.  Correct or correct by instructor.
   
 =item * B<NETWORK_FAILURE>: Information not available due to network failure.  =item * B<CORRECT_BY_OVERRIDE>:
   
 =item * B<ATTEMPTED>: Attempted, and not yet graded.  Correct by instructor override.
   
   =item * B<EXCUSED>:
   
   Excused. Not yet implemented.
   
   =item * B<NETWORK_FAILURE>:
   
   Information not available due to network failure.
   
   =item * B<ATTEMPTED>:
   
   Attempted, and not yet graded.
   
 =back  =back
   
Line 2366  sub queryRestoreHash { Line 3322  sub queryRestoreHash {
   
 B<Composite Status>  B<Composite Status>
   
 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 ($res->NETWORK_FAILURE):  Along with directly returning the date or completion status, the
   resource object includes a convenience function B<status>() that will
   combine the two status tidbits into one composite status that can
   represent the status of the resource as a whole. The precise logic is
   documented in the comments of the status method. The following results
   may be returned, all available as methods on the resource object
   ($res->NETWORK_FAILURE):
   
 =over 4  =over 4
   
 =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.  =item * B<NETWORK_FAILURE>:
   
   The network has failed and the information is not available.
   
   =item * B<NOTHING_SET>:
   
   No dates have been set for this problem (part) at all. (Because only
   certain parts of a multi-part problem may be assigned, this can not be
   collapsed into "open later", as we do not know a given part will EVER
   be opened. For single part, this is the same as "OPEN_LATER".)
   
   =item * B<CORRECT>:
   
 =item * B<NOTHING_SET>: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)  For any reason at all, the part is considered correct.
   
 =item * B<CORRECT>: For any reason at all, the part is considered correct.  =item * B<EXCUSED>:
   
 =item * B<EXCUSED>: For any reason at all, the problem is excused.  For any reason at all, the problem is excused.
   
 =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.  =item * B<PAST_DUE_NO_ANSWER>:
   
 =item * B<PAST_DUE_ANSWER_LATER>: The problem is past due, not considered correct, and an answer date in the future is set.  The problem is past due, not considered correct, and no answer date is
   set.
   
 =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.  =item * B<PAST_DUE_ANSWER_LATER>:
   
 =item * B<OPEN_LATER>: The problem is not yet open.  The problem is past due, not considered correct, and an answer date in
   the future is set.
   
 =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.  =item * B<ANSWER_OPEN>:
   
 =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.  The problem is past due, not correct, and the answer is now available.
   
 =item * B<OPEN>: The item is open and not yet tried.  =item * B<OPEN_LATER>:
   
 =item * B<ATTEMPTED>: The problem has been attempted.  The problem is not yet open.
   
   =item * B<TRIES_LEFT>:
   
   The problem is open, has been tried, is not correct, but there are
   tries left.
   
   =item * B<INCORRECT>:
   
   The problem is open, and all tries have been used without getting the
   correct answer.
   
   =item * B<OPEN>:
   
   The item is open and not yet tried.
   
   =item * B<ATTEMPTED>:
   
   The problem has been attempted.
   
 =back  =back
   
Line 2470  sub status { Line 3463  sub status {
   
 =over 4  =over 4
   
 =item * B<getNext>(): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case.   =item * B<getNext>():
   
   Retreive an array of the possible next resources after this
   one. Always returns an array, even in the one- or zero-element case.
   
   =item * B<getPrevious>():
   
 =item * B<getPrevious>(): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case.   Retreive an array of the possible previous resources from this
   one. Always returns an array, even in the one- or zero-element case.
   
 =cut  =cut
   
Line 2485  sub getNext { Line 3484  sub getNext {
         my $next = $choice->goesto();          my $next = $choice->goesto();
         $next = $self->{NAV_MAP}->getById($next);          $next = $self->{NAV_MAP}->getById($next);
   
         # Don't remember it if the student doesn't have browse priviledges          push @branches, $next;
         # future note: this may properly belong in the client of the resource  
         my $browsePriv = $self->{BROWSE_PRIV};  
         if (!defined($browsePriv)) {  
             $browsePriv = &Apache::lonnet::allowed('bre', $self->src);  
             $self->{BROWSE_PRIV} = $browsePriv;  
         }  
         if (!($browsePriv ne '2' && $browsePriv ne 'F')) {  
             push @branches, $next;  
         }  
     }      }
     return \@branches;      return \@branches;
 }  }
Line 2508  sub getPrevious { Line 3498  sub getPrevious {
         my $prev = $choice->comesfrom();          my $prev = $choice->comesfrom();
         $prev = $self->{NAV_MAP}->getById($prev);          $prev = $self->{NAV_MAP}->getById($prev);
   
         # Don't remember it if the student doesn't have browse priviledges          push @branches, $prev;
         # future note: this may properly belong in the client of the resource  
         my $browsePriv = $self->{BROWSE_PRIV};  
         if (!defined($browsePriv)) {  
             $browsePriv = &Apache::lonnet::allowed('bre', $self->src);  
             $self->{BROWSE_PRIV} = $browsePriv;  
         }  
         if (!($browsePriv ne '2' && $browsePriv ne 'F')) {  
             push @branches, $prev;  
         }  
     }      }
     return \@branches;      return \@branches;
 }  }
   
   sub browsePriv {
       my $self = shift;
       if (defined($self->{BROWSE_PRIV})) {
           return $self->{BROWSE_PRIV};
       }
   
       $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre', $self->src());
   }
   
 =pod  =pod
   
 =back  =back
Removed from v.1.115  
changed lines
  Added in v.1.182

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