loncom/interface/lonsearchcat.pm - view

File: [LON-CAPA] / loncom / interface / lonsearchcat.pm
Revision 1.121: download - view: text, annotated - select for diffs
Tue Jun 18 21:36:38 2002 UTC (21 years, 10 months ago) by matthew
Branches: MAIN
CVS tags: HEAD

Towards rewrite of search interface and internals.
 * POD documentation started.
 * cleanup of BEGIN to use lonnet hashes instead of re-reading hosts.tab.
 * clean up of old POD documentation.
 * beginnings of cleanups of global variables.

# The LearningOnline Network with CAPA # Search Catalog # # $Id: lonsearchcat.pm,v 1.121 2002/06/18 21:36:38 matthew Exp $ # # Copyright Michigan State University Board of Trustees # # This file is part of the LearningOnline Network with CAPA (LON-CAPA). # # LON-CAPA is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # LON-CAPA is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with LON-CAPA; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # /home/httpd/html/adm/gpl.txt # # http://www.lon-capa.org/ # # YEAR=2001 # 3/8, 3/12, 3/13, 3/14, 3/15, 3/19 Scott Harrison # 3/20, 3/21, 3/22, 3/26, 3/27, 4/2, 8/15, 8/24, 8/25 Scott Harrison # 10/12,10/14,10/15,10/16,11/28,11/29,12/10,12/12,12/16 Scott Harrison # YEAR=2002 # 1/17 Scott Harrison # 6/17 Matthew Hall # ############################################################################### ############################################################################### =pod =head1 NAME lonsearchcat =head1 SYNOPSIS Search interface to LON-CAPAs digital library =head1 DESCRIPTION This module enables searching for a distributed browseable catalog. This is part of the LearningOnline Network with CAPA project described at http://www.lon-capa.org. lonsearchcat presents the user with an interface to search the LON-CAPA digital library. lonsearchcat also initiates the execution of a search by sending the search parameters to LON-CAPA servers. The progress of search (on a server basis) is displayed to the user in a seperate window. =head1 Internals =over 4 =cut ############################################################################### ############################################################################### ## ## ## ORGANIZATION OF THIS PERL MODULE ## ## ## ## 1. Modules used by this module ## ## 2. Choices for different output views (detailed, summary, xml, etc) ## ## 3. BEGIN block (to be run once after compilation) ## ## 4. Handling routine called via Apache and mod_perl ## ## 5. Other subroutines ## ## ## ############################################################################### package Apache::lonsearchcat; # ------------------------------------------------- modules used by this module use strict; use Apache::Constants qw(:common); use Apache::lonnet(); use Apache::File(); use CGI qw(:standard); use Text::Query; use GDBM_File; use Apache::loncommon(); # ---------------------------------------- variables used throughout the module ###################################################################### ###################################################################### =pod =item Global variables =over 4 =item %hostdomains matches host name to host domain =item %hostips matches host name to host ip =item %hitcount stores number of hits per host =item $closebutton button that closes the search window =item $importbutton button to take the selecte results and go to group sorting =item $hidden holds 'hidden' html forms =item $scrout string that holds portions of the screen output =item $yourself allows for quickly limiting to oneself =item %hash The ubiquitous database hash =item $basicviewselect and $advancedviewselect View selection forms. These are not actually global and will be moved soon. =item $diropendb The full path to the (temporary) search database file. This is set and used in &handler() and is also used in &output_results(). =back =cut ###################################################################### ###################################################################### # -- information holders my %hostdomains; # matches host name to host domain my %hostips; # matches host name to host ip my %hitcount; # stores number of hits per host # -- dynamically rendered interface components my $closebutton; # button that closes the search window my $importbutton; # button to take the selected results and go to group sorting my $hidden; # Holds 'hidden' html forms # -- miscellaneous variables my $scrout; # string that holds portions of the screen output my $yourself; # allows for quickly limiting to oneself my %hash; # database hash # ------------------------------------------ choices for different output views # Detailed Citation View ---> sub detailed_citation_view # Summary View ---> sub summary_view # Fielded Format ---> sub fielded_format_view # XML/SGML ---> sub xml_sgml_view my $basicviewselect=<<END; <select name='basicviewselect'> <option value='Detailed Citation View' selected="true"> Detailed Citation View</option> <option value='Summary View'>Summary View</option> <option value='Fielded Format'>Fielded Format</option> <option value='XML/SGML'>XML/SGML</option> </select> END my $advancedviewselect=<<END; <select name='advancedviewselect'> <option value='Detailed Citation View' selected="true"> Detailed Citation View</option> <option value='Summary View'>Summary View</option> <option value='Fielded Format'>Fielded Format</option> <option value='XML/SGML'>XML/SGML</option> </select> END #------------------------------------------------------------- global variables my $diropendb = ""; my $domain = ""; # ----------------------------------------------------------------------- BEGIN =pod =item BEGIN block Load %hostdomains and %hostips with data from lonnet.pm. Only library servers are considered. =cut BEGIN { foreach (keys (%Apache::lonnet::libserv)) { $hostdomains{$_}=$Apache::lonnet::hostdom{$_}; $hostips{$_}=$Apache::lonnet::hostip{$_}; } } ###################################################################### ###################################################################### =pod =item &handler() - main handler invoked by httpd child =cut ###################################################################### ###################################################################### # ----------------------------- Handling routine called via Apache and mod_perl sub handler { my $r = shift; untie %hash; $r->content_type('text/html'); $r->send_http_header; return OK if $r->header_only; my $domain = $r->dir_config('lonDefDomain'); $diropendb= "/home/httpd/perl/tmp/".&Apache::lonnet::unescape($domain). "\_".&Apache::lonnet::unescape($ENV{'user.name'})."_searchcat.db"; &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}, ['catalogmode','launch','acts','mode','form','element']); if ($ENV{'form.launch'} eq '1') { if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) { &start_fresh_session(); untie %hash; } else { $r->print('<html><head></head><body>Unable to tie hash to db '. 'file</body></html>'); return OK; } } # --------------------------- Produce some output, so people know it is working $r->print("\n"); $r->rflush; # ----------------------------------- configure dynamic components of interface if ($ENV{'form.catalogmode'} eq 'interactive') { $hidden="<input type='hidden' name='catalogmode' value='interactive'>". "\n"; $closebutton="<input type='button' name='close' value='CLOSE' ". "onClick='self.close()'>"."\n"; } elsif ($ENV{'form.catalogmode'} eq 'groupsearch') { $hidden=<<END; <input type='hidden' name='catalogmode' value='groupsearch'> END $closebutton=<<END; <input type='button' name='close' value='CLOSE' onClick='self.close()'> END $importbutton=<<END; <input type='button' name='import' value='IMPORT' onClick='javascript:select_group()'> END } $hidden .= <<END; <input type='hidden' name='mode' value='$ENV{'form.mode'}'> <input type='hidden' name='form' value='$ENV{'form.form'}'> <input type='hidden' name='element' value='$ENV{'form.element'}'> <input type='hidden' name='date' value='2'> END # ------------------------------------------------------ Determine current user $yourself=$ENV{'user.name'}.'@'.$ENV{'user.domain'}; # --- Now, depending on the interface actions, do one of three things here: # --- 1. a basic search # --- 2. an advanced search # --- 3. output a search interface # ----------------------------------- See if a search invocation should be done if ($ENV{'form.basicsubmit'} eq 'SEARCH') { untie %hash; return &basicsearch($r,\%ENV); } elsif ($ENV{'form.advancedsubmit'} eq 'SEARCH') { untie %hash; return &advancedsearch($r,\%ENV); } # ----------------------------- Else, begin building search interface to output $scrout=''; # building a part of screen output $scrout.=&searchphrasefield('Limit by title','title', $ENV{'form.title'}); $scrout.=&searchphrasefield('Limit by author','author', $ENV{'form.author'}); $scrout.=&searchphrasefield('Limit by subject','subject', $ENV{'form.subject'}); $scrout.=&searchphrasefield('Limit by keywords','keywords', $ENV{'form.keywords'}); $scrout.=&searchphrasefield('Limit by URL','url', $ENV{'form.url'}); # $scrout.=&searchphrasefield('Limit by version','version', # $ENV{'form.version'}); $scrout.=&searchphrasefield('Limit by notes','notes', $ENV{'form.notes'}); $scrout.=&searchphrasefield('Limit by abstract','abstract', $ENV{'form.abstract'}); $ENV{'form.mime'}='any' unless length($ENV{'form.mime'}); $scrout.=&selectbox('Limit by MIME type','mime', $ENV{'form.mime'}, 'any','Any type', \&{Apache::loncommon::filedescriptionex}, (&Apache::loncommon::fileextensions)); $ENV{'form.language'}='any' unless length($ENV{'form.language'}); $scrout.=&selectbox('Limit by language','language', $ENV{'form.language'},'any','Any Language', \&{Apache::loncommon::languagedescription}, (&Apache::loncommon::languageids), ); # ------------------------------------------------ Compute date selection boxes $scrout.=<<CREATIONDATESTART; <p> <font color="#800000" face="helvetica"><b>LIMIT BY CREATION DATE RANGE:</b> </font> <br /> between: CREATIONDATESTART $scrout.=&dateboxes('creationdatestart',1,1,1976, $ENV{'form.creationdatestart_month'}, $ENV{'form.creationdatestart_day'}, $ENV{'form.creationdatestart_year'}, ); $scrout.=<<CREATIONDATEEND; and: CREATIONDATEEND $scrout.=&dateboxes('creationdateend',12,31,2051, $ENV{'form.creationdateend_month'}, $ENV{'form.creationdateend_day'}, $ENV{'form.creationdateend_year'}, ); $scrout.="</p>"; $scrout.=<<LASTREVISIONDATESTART; <p> <font color="#800000" face="helvetica"><b>LIMIT BY LAST REVISION DATE RANGE: </b></font> <br />between: LASTREVISIONDATESTART $scrout.=&dateboxes('lastrevisiondatestart',1,1,1976, $ENV{'form.lastrevisiondatestart_month'}, $ENV{'form.lastrevisiondatestart_day'}, $ENV{'form.lastrevisiondatestart_year'}, ); $scrout.=<<LASTREVISIONDATEEND; and: LASTREVISIONDATEEND $scrout.=&dateboxes('lastrevisiondateend',12,31,2051, $ENV{'form.lastrevisiondateend_month'}, $ENV{'form.lastrevisiondateend_day'}, $ENV{'form.lastrevisiondateend_year'}, ); $scrout.='</p>'; $scrout.=&searchphrasefield('Limit by publisher/owner','owner', $ENV{'form.owner'}); $ENV{'form.copyright'}='any' unless length($ENV{'form.copyright'}); $scrout.=&selectbox('Limit by copyright/distribution','copyright', $ENV{'form.copyright'}, 'any','Any copyright/distribution', \&{Apache::loncommon::copyrightdescription}, (&Apache::loncommon::copyrightids), ); # ------------------------------------------- Compute customized metadata field $scrout.=<<CUSTOMMETADATA; <p> <font color="#800000" face="helvetica"><b>LIMIT BY SPECIAL METADATA FIELDS:</b> </font> For resource-specific metadata, enter in an expression in the form of <i>key</i>=<i>value</i> separated by operators such as AND, OR or NOT.<br /> <b>Example:</b> grandmother=75 OR grandfather=85 <br /> CUSTOMMETADATA $scrout.=&simpletextfield('custommetadata',$ENV{'form.custommetadata'}); $scrout.=' <i>initial users of this system do not need to worry about this option</i>'; $scrout.=<<CUSTOMSHOW; <p> <font color="#800000" face="helvetica"><b>SHOW SPECIAL METADATA FIELDS:</b> </font> Enter in a space-separated list of special metadata fields to show in a fielded listing for each record result. <br /> CUSTOMSHOW $scrout.=&simpletextfield('customshow',$ENV{'form.customshow'}); $scrout.=' <i>initial users of this system do not need to worry about this option</i>'; # ---------------------------------------------------------------- Print screen $r->print(<<ENDDOCUMENT); <html> <head> <title>The LearningOnline Network with CAPA</title> <script type="text/javascript"> function openhelp(val) { openhelpwin=open('/adm/help/searchcat.html','helpscreen', 'scrollbars=1,width=600,height=300'); openhelpwin.focus(); } </script> </head> <body bgcolor="#FFFFFF"> <img align='right' src='/adm/lonIcons/lonlogos.gif' /> <h1>Search Catalog</h1> <form method="post" action="/adm/searchcat"> $hidden <hr /> <h3>Basic Search</h3> <p> Enter terms or phrases separated by search operators such as AND, OR, or NOT then press SEARCH below. Terms should be specific to the title, author, subject, notes, or abstract information associated with a resource. <br /> ENDDOCUMENT $r->print(&simpletextfield('basicexp',$ENV{'form.basicexp'})); $r->print(' '); $r->print(&simplecheckbox('titleonly',$ENV{'form.titleonly'})); $r->print('<font color="#800000">Title only</font> '); # $r->print(&simplecheckbox('allversions',$ENV{'form.allversions'})); # <font color="#800000">Search historic archives</font> $r->print(<<ENDDOCUMENT); <br /> <input type="submit" name="basicsubmit" value='SEARCH' /> <input type="reset" name="reset" value='RESET' /> $closebutton $basicviewselect <input type="button" value="HELP" onClick="openhelp()" /> </p> <hr /> <h3>Advanced Search</h3> $scrout <p> <input type="submit" name="advancedsubmit" value='SEARCH' /> <input type="reset" name="reset" value='RESET' /> $closebutton $advancedviewselect <input type="button" value="HELP" onClick="openhelp()" /> </p> </form> </body> </html> ENDDOCUMENT return OK; } ###################################################################### ###################################################################### =pod =item &make_persistent() Returns a scalar which holds the current ENV{'form.*'} values in a 'hidden' html input tag. =cut ###################################################################### ###################################################################### # ------------------------------------------------------------- make persistent sub make_persistent { my $persistent=''; foreach (keys %ENV) { if (/^form\./ && !/submit/) { my $name=$_; my $key=$name; $ENV{$key}=~s/\'//g; # do not mess with html field syntax $name=~s/^form\.//; $persistent.=<<END; <input type='hidden' name='$name' value='$ENV{$key}' /> END } } return $persistent; } # --------------------------------------------------------- Various form fields sub simpletextfield { my ($name,$value)=@_; return '<input type=text name=\''.$name. '\' size=20 value=\''.$value.'\' />'; } sub simplecheckbox { my ($name,$value)=@_; my $checked=''; $checked="CHECKED" if $value eq 'on'; return '<input type=checkbox name=\''.$name.'\' '. $checked . '>'; } sub searchphrasefield { my ($title,$name,$value)=@_; my $instruction=<<END; Enter terms or phrases separated by search operators such as AND, OR, or NOT. END my $uctitle=uc($title); return "\n<p><font color=\"#800000\" face=\"helvetica\"><b>$uctitle:</b>". "</FONT> $instruction<br />". '<input type=text name="'.$name.'" size=80 value=\''.$value.'\'>'; } sub dateboxes { my ($name,$defaultmonth,$defaultday,$defaultyear, $currentmonth,$currentday,$currentyear)=@_; ($defaultmonth,$defaultday,$defaultyear)=('','',''); # # Day my $day=<<END; <select name="${name}_day"> <option value='$defaultday'> </option> END for (my $i = 1; $i<=31; $i++) { $day.="<option value=\"$i\">$i</option>\n"; } $day.="</select>\n"; $day=~s/(\"$currentday\")/$1 SELECTED/ if length($currentday); # # Month my $month=<<END; <select name="${name}_month"> <option value='$defaultmonth'> </option> END my $i = 1; foreach (qw/January February March April May June July August September October November December /){ $month .="<option value=\"$i\">$_</option>\n"; $i++; } $month.="</select>\n"; $month=~s/(\"$currentmonth\")/$1 SELECTED/ if length($currentmonth); # # Year (obviously) my $year=<<END; <select name="${name}_year"> <option value='$defaultyear'> </option> END my $maxyear = 2051; for (my $i = 1976; $i<=$maxyear; $i++) { $year.="<option value=\"$i\">$i</option>\n"; } $year.="</select>\n"; $year=~s/(\"$currentyear\")/$1 SELECTED/ if length($currentyear); return "$month$day$year"; } sub selectbox { my ($title,$name,$value,$anyvalue,$anytag,$functionref,@idlist)=@_; my $uctitle=uc($title); my $selout="\n<p><font color=\"#800000\" face=\"helvetica\"><b>$uctitle:". "</b></font><br />".'<select name="'.$name.'">'; foreach ($anyvalue,@idlist) { $selout.='<option value=\''.$_.'\''; if ($_ eq $value and !/^any$/) { $selout.=' selected>'.&{$functionref}($_).'</option>'; } elsif ($_ eq $value and /^$anyvalue$/) { $selout.=' selected>'.$anytag.'</option>'; } else {$selout.='>'.&{$functionref}($_).'</option>';} } return $selout.'</select>'; } # ----------------------------------------------- Performing an advanced search sub advancedsearch { my ($r,$envhash)=@_; my %ENV=%{$envhash}; my $fillflag=0; # Clean up fields for safety for my $field ('title','author','subject','keywords','url','version', 'creationdatestart_month','creationdatestart_day', 'creationdatestart_year','creationdateend_month', 'creationdateend_day','creationdateend_year', 'lastrevisiondatestart_month','lastrevisiondatestart_day', 'lastrevisiondatestart_year','lastrevisiondateend_month', 'lastrevisiondateend_day','lastrevisiondateend_year', 'notes','abstract','mime','language','owner', 'custommetadata','customshow') { $ENV{"form.$field"}=~s/[^\w\/\s\=\-\"\']//g; } foreach ('mode','form','element') { # is this required? Hmmm. next unless (exists($ENV{"form.$_"})); $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); $ENV{"form.$_"}=~s/[^\w\/\s\=\-\"\']//g; } # Check to see if enough information was filled in for my $field ('title','author','subject','keywords','url','version', 'notes','abstract','mime','language','owner', 'custommetadata') { if (&filled($ENV{"form.$field"})) { $fillflag++; } } unless ($fillflag) { &output_blank_field_error($r); return OK; } # Turn the form input into a SQL-based query my $query=''; my @queries; # Evaluate logical expression AND/OR/NOT phrase fields. foreach my $field ('title','author','subject','notes','abstract','url', 'keywords','version','owner') { if ($ENV{'form.'.$field}) { push @queries,&build_SQL_query($field,$ENV{'form.'.$field}); } } # Evaluate option lists if ($ENV{'form.language'} and $ENV{'form.language'} ne 'any') { push @queries,"(language like \"$ENV{'form.language'}\")"; } if ($ENV{'form.mime'} and $ENV{'form.mime'} ne 'any') { push @queries,"(mime like \"$ENV{'form.mime'}\")"; } if ($ENV{'form.copyright'} and $ENV{'form.copyright'} ne 'any') { push @queries,"(copyright like \"$ENV{'form.copyright'}\")"; } # Evaluate date windows my $datequery=&build_date_queries( $ENV{'form.creationdatestart_month'}, $ENV{'form.creationdatestart_day'}, $ENV{'form.creationdatestart_year'}, $ENV{'form.creationdateend_month'}, $ENV{'form.creationdateend_day'}, $ENV{'form.creationdateend_year'}, $ENV{'form.lastrevisiondatestart_month'}, $ENV{'form.lastrevisiondatestart_day'}, $ENV{'form.lastrevisiondatestart_year'}, $ENV{'form.lastrevisiondateend_month'}, $ENV{'form.lastrevisiondateend_day'}, $ENV{'form.lastrevisiondateend_year'}, ); # Test to see if date windows are legitimate if ($datequery=~/^Incorrect/) { &output_date_error($r,$datequery); return OK; } elsif ($datequery) { push @queries,$datequery; } # Process form information for custom metadata querying my $customquery=''; if ($ENV{'form.custommetadata'}) { $customquery=&build_custommetadata_query('custommetadata', $ENV{'form.custommetadata'}); } my $customshow=''; if ($ENV{'form.customshow'}) { $customshow=$ENV{'form.customshow'}; $customshow=~s/[^\w\s]//g; my @fields=split(/\s+/,$customshow); $customshow=join(" ",@fields); } # Send query statements over the network to be processed by either the SQL # database or a recursive scheme of 'grep'-like actions (for custom # metadata). if (@queries) { $query=join(" AND ",@queries); $query="select * from metadata where $query"; my $reply; # reply hash reference unless ($customquery or $customshow) { $reply=&Apache::lonnet::metadata_query($query); } else { $reply=&Apache::lonnet::metadata_query($query, $customquery,$customshow); } &output_results('Advanced',$r,$envhash,$customquery,$reply); } elsif ($customquery) { my $reply; # reply hash reference $reply=&Apache::lonnet::metadata_query('', $customquery,$customshow); &output_results('Advanced',$r,$envhash,$customquery,$reply); } # should not get to this point return 'Error. Should not have gone to this point.'; } # --------------------------------------------------- Performing a basic search sub basicsearch { my ($r,$envhash)=@_; my %ENV=%{$envhash}; # Clean up fields for safety for my $field ('basicexp') { $ENV{"form.$field"}=~s/[^\w\s\-]//g; } foreach ('mode','form','element') { # is this required? Hmmm. next unless (exists($ENV{"form.$_"})); $ENV{"form.$_"}=&Apache::lonnet::unescape($ENV{"form.$_"}); $ENV{"form.$_"}=~s/[^\w\/\s\=\-\"\']//g; } # Check to see if enough is filled in unless (&filled($ENV{'form.basicexp'})) { &output_blank_field_error($r); return OK; } # Build SQL query string based on form page my $query=''; my $concatarg=join('," ",', ('title', 'author', 'subject', 'notes', 'abstract')); $concatarg='title' if $ENV{'form.titleonly'}; $query=&build_SQL_query('concat('.$concatarg.')',$ENV{'form.'.'basicexp'}); # Get reply (either a hash reference to filehandles or bad connection) my $reply=&Apache::lonnet::metadata_query('select * from metadata where '.$query); # Output search results &output_results('Basic',$r,$envhash,$query,$reply); return OK; } # ------------------------------------------------------------- build_SQL_query sub build_SQL_query { my ($field_name,$logic_statement)=@_; my $q=new Text::Query('abc', -parse => 'Text::Query::ParseAdvanced', -build => 'Text::Query::Build'); $q->prepare($logic_statement); my $matchexp=${$q}{'matchexp'}; chomp $matchexp; my $sql_query=&recursive_SQL_query_build($field_name,$matchexp); return $sql_query; } # ------------------------------------------------- build custom metadata query sub build_custommetadata_query { my ($field_name,$logic_statement)=@_; my $q=new Text::Query('abc', -parse => 'Text::Query::ParseAdvanced', -build => 'Text::Query::BuildAdvancedString'); $q->prepare($logic_statement); my $matchexp=${$q}{'-parse'}{'-build'}{'matchstring'}; # quick fix to change literal into xml tag-matching # will eventually have to write a separate builder module my $oldmatchexp=$matchexp; $matchexp=~s/(\w+)\\=([\w\\\+]+)/\\<$1\\>\[\^\\<\]\*$2\[\^\\<\]\*\\<\\\/$1\\>/g; return $matchexp; } # - Recursively parse a reverse notation expression into a SQL query expression sub recursive_SQL_query_build { my ($dkey,$pattern)=@_; my @matches=($pattern=~/(\[[^\]|\[]*\])/g); return $pattern unless @matches; foreach my $match (@matches) { $match=~/\[ (\w+)\s(.*) \]/; my ($key,$value)=($1,$2); my $replacement=''; if ($key eq 'literal') { $replacement="($dkey like \"\%$value\%\")"; } elsif ($key eq 'not') { $value=~s/like/not like/; # $replacement="($dkey not like $value)"; $replacement="$value"; } elsif ($key eq 'and') { $value=~/(.*[\"|\)]) ([|$|\^].*)/; $replacement="($1 AND $2)"; } elsif ($key eq 'or') { $value=~/(.*[\"|$]) ([|\(|\^].*)/; $replacement="($1 OR $2)"; } substr($pattern, index($pattern,$match), length($match), $replacement ); } &recursive_SQL_query_build($dkey,$pattern); } # ------------------------------------------------------------ Build date query sub build_date_queries { my ($cmonth1,$cday1,$cyear1,$cmonth2,$cday2,$cyear2, $lmonth1,$lday1,$lyear1,$lmonth2,$lday2,$lyear2)=@_; my @queries; if ($cmonth1 or $cday1 or $cyear1 or $cmonth2 or $cday2 or $cyear2) { unless ($cmonth1 and $cday1 and $cyear1 and $cmonth2 and $cday2 and $cyear2) { return "Incorrect entry for the creation date. You must specify ". "a starting month, day, and year and an ending month, ". "day, and year."; } my $cnumeric1=sprintf("%d%2d%2d",$cyear1,$cmonth1,$cday1); $cnumeric1+=0; my $cnumeric2=sprintf("%d%2d%2d",$cyear2,$cmonth2,$cday2); $cnumeric2+=0; if ($cnumeric1>$cnumeric2) { return "Incorrect entry for the creation date. The starting ". "date must occur before the ending date."; } my $cquery="(creationdate BETWEEN '$cyear1-$cmonth1-$cday1' AND '". "$cyear2-$cmonth2-$cday2 23:59:59')"; push @queries,$cquery; } if ($lmonth1 or $lday1 or $lyear1 or $lmonth2 or $lday2 or $lyear2) { unless ($lmonth1 and $lday1 and $lyear1 and $lmonth2 and $lday2 and $lyear2) { return "Incorrect entry for the last revision date. You must ". "specify a starting month, day, and year and an ending ". "month, day, and year."; } my $lnumeric1=sprintf("%d%2d%2d",$lyear1,$lmonth1,$lday1); $lnumeric1+=0; my $lnumeric2=sprintf("%d%2d%2d",$lyear2,$lmonth2,$lday2); $lnumeric2+=0; if ($lnumeric1>$lnumeric2) { return "Incorrect entry for the last revision date. The ". "starting date must occur before the ending date."; } my $lquery="(lastrevisiondate BETWEEN '$lyear1-$lmonth1-$lday1' AND '". "$lyear2-$lmonth2-$lday2 23:59:59')"; push @queries,$lquery; } if (@queries) { return join(" AND ",@queries); } return ''; } # ----------------------------- format and output results based on a reply list # There are two windows that this function writes to. The main search # window ("srch") has a listing of the results. A secondary window ("popwin") # gives the status of the network search (time elapsed, number of machines # contacted, etc.) sub output_results { my $fnum; # search result counter my ($mode,$r,$envhash,$query,$replyref)=@_; my %ENV=%{$envhash}; my %rhash=%{$replyref}; my $compiledresult=''; my $timeremain=300; my $elapsetime=0; my $resultflag=0; my $tflag=1; # make query information persistent to allow for subsequent revision my $persistent=&make_persistent(); # output beginning of search page $r->print(<<BEGINNING); <html> <head> <title>The LearningOnline Network with CAPA</title> BEGINNING # conditional output of script functions dependent on the mode in # which the search was invoked if ($ENV{'form.catalogmode'} eq 'interactive'){ if (! exists($ENV{'form.mode'}) || $ENV{'form.mode'} ne 'edit') { $r->print(<<SCRIPT) <script type="text/javascript"> function select_data(title,url) { changeTitle(title); changeURL(url); self.close(); } function changeTitle(val) { if (opener.inf.document.forms.resinfo.elements.t) { opener.inf.document.forms.resinfo.elements.t.value=val; } } function changeURL(val) { if (opener.inf.document.forms.resinfo.elements.u) { opener.inf.document.forms.resinfo.elements.u.value=val; } } </script> SCRIPT } elsif ($ENV{'form.mode'} eq 'edit') { my $form = $ENV{'form.form'}; my $element = $ENV{'form.element'}; $r->print(<<SCRIPT) <script type="text/javascript"> function select_data(title,url) { changeURL(url); self.close(); } function changeTitle(val) { } function changeURL(val) { if (window.opener.document) { window.opener.document.forms["$form"].elements["$element"].value=val; } else { var url = 'forms[\"$form\"].elements[\"$element\"].value'; alert("Unable to transfer data to "+url); } } </script> SCRIPT } } $r->print(<<SCRIPT) if $ENV{'form.catalogmode'} eq 'groupsearch'; <script type="text/javascript"> function select_data(title,url) { // alert('DEBUG: Should be storing '+title+' and '+url); } function queue(val) { if (eval("document.forms.results.returnvalues["+val+"].checked")) { document.forms.results.acts.value+='1a'+val+'b'; } else { document.forms.results.acts.value+='0a'+val+'b'; } } function select_group() { window.location= "/adm/groupsort?mode=$ENV{'form.mode'}&catalogmode=groupsearch&acts="+ document.forms.results.acts.value; } </script> SCRIPT $r->print(<<SCRIPT); <script type="text/javascript"> function displayinfo(val) { popwin.document.forms.popremain.sdetails.value=val; } function openhelp(val) { openhelpwin=open('/adm/help/searchcat.html','helpscreen', 'scrollbars=1,width=400,height=300'); openhelpwin.focus(); } function abortsearch(val) { popwin.close(); } </script> SCRIPT $r->rflush(); # begin showing the cataloged results $r->print(<<CATALOGBEGIN); </head> <body bgcolor="#ffffff"> <img align=right src=/adm/lonIcons/lonlogos.gif> <h1>Search Catalog</h1> CATALOGBEGIN $r->print(<<CATALOGCONTROLS); <form name='results' method="post" action="/adm/searchcat"> $hidden <input type='hidden' name='acts' value='' /> <input type='button' value='Revise search request' onClick='this.form.submit();' /> $importbutton $closebutton $persistent <hr /> <h3>Search Query</h3> CATALOGCONTROLS if ($mode eq 'Basic') { $r->print(<<RESULTS); <p> <b>Basic search:</b> $ENV{'form.basicexp'} </p> RESULTS } elsif ($mode eq 'Advanced') { $r->print(<<RESULTS); <p> <b>Advanced search</b> $query </p> RESULTS } $r->print('<h3>Search Results</h3>'); $r->rflush(); my $servernum=(keys %rhash)+0; # define server grid (shows status of multiple machines) my $hcinit; my $grid="'<br />'+"; $grid.="\n"; my $sn=1; for my $sk (sort keys %rhash) { # '<a href=" $grid.="'<a href=\""; # javascript:displayinfo('+ $grid.="javascript:opener.displayinfo('+"; # "'"+'key $grid.="\"'\"+'"; $grid.=$sk; my $hc; if ($rhash{$sk} eq 'con_lost') { $hc="BAD CONNECTION, CONTACT SYSTEM ADMINISTRATOR "; } else { $hc="'+\"'\"+\"+hc['$sk']+\"+\"'\"+'"; $hcinit.="hc[\"$sk\"]=\"not yet connected...\";"; } $grid.=" hitcount=".$hc; $grid.=" domain=".$hostdomains{$sk}; $grid.=" IP=".$hostips{$sk}; # '+"'"+'">'+ $grid.="'+\"'\"+')\">'+"; $grid.="\n"; $grid.="'<img border=\"0\" name=\"img".$sn."\"". " src=\"/adm/lonIcons/srvnull.gif\" alt=\"".$sk."\" /></a>'+\n"; $grid.="'<br />'+\n" unless $sn%10; $sn++; } $r->print(<<ENDPOP); <script type="text/javascript"> popwin=open('','popwin','scrollbars=1,width=400,height=220'); popwin.focus(); popwin.document.writeln('<'+'html>'); popwin.document.writeln('<'+'head>'); popwin.document.writeln('<'+'script>'); popwin.document.writeln('hc=new Array();$hcinit'); popwin.document.writeln('<'+'/script>'); popwin.document.writeln('<'+'/head>'+ '<'+'body bgcolor="#FFFFFF">'+ '<'+'image name="whirly" align="right" src="/adm/lonIcons/'+ 'lonanim.gif" '+ 'alt="animated logo" />'+ '<'+'h3>Search Results Progress<'+'/h3>'+ '<'+'form name="popremain">'+ '<'+'tt>'+ '<'+'br clear="all"/><i>PLEASE BE PATIENT</i>'+ '<'+'br />SCANNING $servernum SERVERS'+ '<'+'br clear="all" />Number of record hits found '+ '<'+'input type="text" size="10" name="numhits"'+ ' value="0" />'+ '<'+'br clear="all" />Time elapsed '+ '<'+'input type="text" size="10" name="elapsetime"'+ ' value="0" />'+ '<'+'br />'+ 'SERVER GRID (click on any cell for details)'+ $grid '<'+'br />'+ 'Server details '+ '<'+'input type="text" size="35" name="sdetails"'+ ' value="" />'+ '<'+'br />'+ ' <'+'input type="button" name="button"'+ ' value="close this window" '+ ' onClick="javascript:opener.abortsearch()" />'+ ' <'+'input type="button" name="button"'+ ' value="help" onClick="javascript:opener.openhelp()" />'+ '<'+'/tt>'+ '<'+'/form>'+ '<'+'/body><'+'/html>'); popwin.document.close(); </script> ENDPOP $r->rflush(); my $servercount=0; my $hitcountsum=0; my $bloop=$servernum; my %orkey; BLOOP: while(1) { my $sn=0; last BLOOP unless $bloop; last BLOOP unless $timeremain; RLOOP: foreach my $rkey (sort keys %rhash) { $sn++; next RLOOP if $orkey{$rkey}; $servercount++; $tflag=1; $compiledresult=''; my $hostname=$rkey; my $reply=$rhash{$rkey}; my @results; my $replyfile=''; if ($reply eq 'con_lost') { &popwin_imgupdate($r,$sn,"srvbad.gif"); $bloop--; $orkey{$rkey}=1; } else { $reply=~/^([\.\w]+)$/; # must do since 'use strict' checks for tainting $replyfile=$r->dir_config('lonDaemons').'/tmp/'.$1; $reply=~/(.*?)\_/; { my $temp=0; WLOOP: while (1) { if (-e $replyfile && $tflag) { &popwin_imgupdate($r,$sn,"srvhalf.gif"); &popwin_js($r,'popwin.hc["'.$rkey.'"]='. '"still transferring..."'.';'); $tflag=0; } if (-e "$replyfile.end") { $bloop--; $orkey{$rkey}=1; if (-s $replyfile) { &popwin_imgupdate($r,$sn,"srvgood.gif"); my $fh=Apache::File->new($replyfile) or ($r->print('ERROR: file '. $replyfile.' cannot be opened') and return OK); @results=<$fh> if $fh; $hitcount{$rkey}=@results+0; &popwin_js($r,'popwin.hc["'.$rkey.'"]='. $hitcount{$rkey}.';'); $hitcountsum+=$hitcount{$rkey}; &popwin_js($r,'popwin.document.forms.popremain.'. 'numhits.value='.$hitcountsum.';'); } else { &popwin_imgupdate($r,$sn,"srvempty.gif"); &popwin_js($r,'popwin.hc["'.$rkey.'"]=0;'); } last WLOOP; } if ($temp>1) { sleep 1; $timeremain--; $elapsetime++; last WLOOP; } last WLOOP unless $timeremain; sleep 1; $timeremain--; $elapsetime++; &popwin_js($r,"popwin.document.popremain.". "elapsetime.value=$elapsetime;"); $temp++; } } &popwin_js($r,'popwin.document.whirly.'. 'src="/adm/lonIcons/lonanimend.gif";'); } my $customshow=''; my $extrashow=''; my @customfields; if ($ENV{'form.customshow'}) { $customshow=$ENV{'form.customshow'}; $customshow=~s/[^\w\s]//g; my @fields=map {"<font color=\"#008000\">$_:</font>"} split(/\s+/,$customshow); @customfields=split(/\s+/,$customshow); if ($customshow) { $extrashow="<ul><li>".join("</li><li>",@fields)."</li></ul>\n"; } } my $customdata=''; my %customhash; foreach my $result (@results) { if ($result=~/^(custom\=.*)$/) { # grab all custom metadata my $tmp=$result; $tmp=~s/^custom\=//; my ($k,$v)=map {&Apache::lonnet::unescape($_); } split(/\,/,$tmp); $customhash{$k}=$v; } } if (keys %hash) { untie %hash; } if (tie(%hash,'GDBM_File',$diropendb,&GDBM_WRCREAT,0640)) { if ($ENV{'form.launch'} eq '1') { &start_fresh_session(); } foreach my $result (@results) { next if $result=~/^custom\=/; chomp $result; next unless $result; my @fields=map {&Apache::lonnet::unescape($_)} (split(/\,/,$result)); my ($title,$author,$subject,$url,$keywords,$version, $notes,$abstract,$mime,$lang, $creationdate,$lastrevisiondate,$owner,$copyright)=@fields; unless ($title) { $title='<i>Untitled</i>'; } unless ($ENV{'user.adv'}) { $keywords='<i>- not displayed -</i>'; $fields[4]=$keywords; $notes='<i>- not displayed -</i>'; $fields[6]=$notes; $abstract='<i>- not displayed -</i>'; $fields[7]=$abstract; $subject='<i>- not displayed -</i>'; $fields[2]=$subject; } my $shortabstract=$abstract; $shortabstract=substr($abstract,0,200).'...' if length($abstract)>200; $fields[7]=$shortabstract; my $shortkeywords=$keywords; $shortkeywords=substr($keywords,0,200).'...' if length($keywords)>200; $fields[4]=$shortkeywords; my $extrashow2=$extrashow; if ($extrashow) { foreach my $field (@customfields) { my $value=''; if ($customhash{$url}=~/\<${field}[^\>]*\>(.*?)\<\/${field}[^\>]*\>/s) { $value=$1; } $extrashow2=~s/\<\!\-\- $field \-\-\>/ $value/g; } } $compiledresult.=<<END if $compiledresult or $servercount!=$servernum; <hr align='left' width='200' noshade /> END $compiledresult.=<<END; <p> END if ($ENV{'form.catalogmode'} eq 'interactive') { my $titleesc=$title; $titleesc=~s/\'/\\'/; # ' $compiledresult.=<<END if ($ENV{'form.catalogmode'} eq 'interactive'); <font size='-1'><INPUT TYPE="button" NAME="returnvalues" VALUE="SELECT" onClick="javascript:select_data('$titleesc','$url')"> </font> <br /> END } if ($ENV{'form.catalogmode'} eq 'groupsearch') { $fnum+=0; $hash{"pre_${fnum}_link"}=$url; $hash{"pre_${fnum}_title"}=$title; $compiledresult.=<<END; <font size='-1'> <input type="checkbox" name="returnvalues" value="SELECT" onClick="javascript:queue($fnum)" /> </font> <br /> END # <input type="hidden" name="title$fnum" value="$title" /> # <input type="hidden" name="url$fnum" value="$url" /> $fnum++; } my $httphost=$ENV{'HTTP_HOST'}; my $viewselect; if ($mode eq 'Basic') { $viewselect=$ENV{'form.basicviewselect'}; } elsif ($mode eq 'Advanced') { $viewselect=$ENV{'form.advancedviewselect'}; } if ($viewselect eq 'Detailed Citation View') { $compiledresult.=&detailed_citation_view(@fields, $hostname,$httphost, $extrashow2); } elsif ($viewselect eq 'Summary View') { $compiledresult.=&summary_view(@fields,$hostname,$httphost, $extrashow2); } elsif ($viewselect eq 'Fielded Format') { $compiledresult.=&fielded_format_view(@fields,$hostname, $httphost,$extrashow2); } elsif ($viewselect eq 'XML/SGML') { $compiledresult.=&xml_sgml_view(@fields,$hostname,$httphost, $extrashow2); } } untie %hash; } else { $r->print('<html><head></head><body>Unable to tie hash to db '. 'file</body></html>'); } if ($compiledresult) { $resultflag=1; } $r->print(<<RESULTS); $compiledresult RESULTS my $percent=sprintf('%3.0f',($servercount/$servernum*100)); } } unless ($resultflag) { $r->print("\nThere were no results that matched your query\n"); } # $r->print('<script type="text/javascript">'.'popwin.close()</script>'."\n"); $r->rflush(); $r->print(<<RESULTS); </body> </html> RESULTS } # ------------------------------------------------------ Detailed Citation View sub detailed_citation_view { my ($title,$author,$subject,$url,$keywords,$version, $notes,$shortabstract,$mime,$lang, $creationdate,$lastrevisiondate,$owner,$copyright, $hostname,$httphost,$extrashow)=@_; my $result=<<END; <i>$owner</i>, last revised $lastrevisiondate <h3><A HREF="http://$httphost$url" TARGET='search_preview'>$title</A></h3> <h3>$author</h3> </p> <p> <b>Subject:</b> $subject<br /> <b>Keyword(s):</b> $keywords<br /> <b>Notes:</b> $notes<br /> <b>MIME Type:</b> END $result.=&Apache::loncommon::filedescription($mime); $result.=<<END; <br /> <b>Language:</b> END $result.=&Apache::loncommon::languagedescription($lang); $result.=<<END; <br /> <b>Copyright/Distribution:</b> END $result.=&Apache::loncommon::copyrightdescription($copyright); $result.=<<END; <br /> </p> $extrashow <p> $shortabstract </p> END return $result; } # ---------------------------------------------------------------- Summary View sub summary_view { my ($title,$author,$subject,$url,$keywords,$version, $notes,$shortabstract,$mime,$lang, $creationdate,$lastrevisiondate,$owner,$copyright, $hostname,$httphost,$extrashow)=@_; my $cprtag=&Apache::loncommon::copyrightdescription($copyright); my $result=<<END; <a href="http://$httphost$url" TARGET='search_preview'>$author</a><br /> $title<br /> $owner -- $lastrevisiondate<br /> $cprtag<br /> $extrashow </p> END return $result; } # -------------------------------------------------------------- Fielded Format sub fielded_format_view { my ($title,$author,$subject,$url,$keywords,$version, $notes,$shortabstract,$mime,$lang, $creationdate,$lastrevisiondate,$owner,$copyright, $hostname,$httphost,$extrashow)=@_; my $mimetag=&Apache::loncommon::filedescription($mime); my $language=&Apache::loncommon::languagedescription($lang); my $cprtag=&Apache::loncommon::copyrightdescription($copyright); my $result=<<END; <b>URL: </b> <A HREF="http://$httphost$url" TARGET='search_preview'>$url</A> <br /> <b>Title:</b> $title<br /> <b>Author(s):</b> $author<br /> <b>Subject:</b> $subject<br /> <b>Keyword(s):</b> $keywords<br /> <b>Notes:</b> $notes<br /> <b>MIME Type:</b> $mimetag<br /> <b>Language:</b> $language<br /> <b>Creation Date:</b> $creationdate<br /> <b>Last Revision Date:</b> $lastrevisiondate<br /> <b>Publisher/Owner:</b> $owner<br /> <b>Copyright/Distribution:</b> $cprtag<br /> <b>Repository Location:</b> $hostname<br /> <b>Abstract:</b> $shortabstract<br /> $extrashow </p> END return $result; } # -------------------------------------------------------------------- XML/SGML sub xml_sgml_view { my ($title,$author,$subject,$url,$keywords,$version, $notes,$shortabstract,$mime,$lang, $creationdate,$lastrevisiondate,$owner,$copyright, $hostname,$httphost,$extrashow)=@_; my $cprtag=&Apache::loncommon::copyrightdescription($copyright); my $mimetag=&Apache::loncommon::filedescription($mime); my $language=&Apache::loncommon::languagedescription($lang); my $result=<<END; <pre> <LonCapaResource> <url>$url</url> <title>$title</title> <author>$author</author> <subject>$subject</subject> <keywords>$keywords</keywords> <notes>$notes</notes> <mimeInfo> <mime>$mime</mime> <mimetag>$mimetag</mimetag> </mimeInfo> <languageInfo> <language>$lang</language> <languagetag>$language</languagetag> </languageInfo> <creationdate>$creationdate</creationdate> <lastrevisiondate>$lastrevisiondate</lastrevisiondate> <owner>$owner</owner> <copyrightInfo> <copyright>$copyright</copyright> <copyrighttag>$cprtag</copyrighttag> </copyrightInfo> <repositoryLocation>$hostname</repositoryLocation> <shortabstract>$shortabstract</shortabstract> </LonCapaResource> </pre> $extrashow END return $result; } # ---------------------------------------------------- see if a field is filled sub filled { my ($field)=@_; if ($field=~/\S/ && $field ne 'any') { return 1; } else { return 0; } } # ---------------- Message to output when there are not enough fields filled in sub output_blank_field_error { my ($r)=@_; # make query information persistent to allow for subsequent revision my $persistent=&make_persistent(); $r->print(<<BEGINNING); <html> <head> <title>The LearningOnline Network with CAPA</title> BEGINNING $r->print(<<RESULTS); </head> <body bgcolor="#ffffff"> <img align='right' src='/adm/lonIcons/lonlogos.gif' /> <h1>Search Catalog</h1> <form method="post" action="/adm/searchcat"> $persistent <input type='button' value='Revise search request' onClick='this.form.submit();' /> $closebutton <hr /> <h3>Helpful Message</h3> <p> Incorrect search query due to blank entry fields. You need to fill in the relevant fields on the search page in order for a query to be processed. </p> </body> </html> RESULTS } # ----------------------------------------------------------- Output date error sub output_date_error { my ($r,$message)=@_; # make query information persistent to allow for subsequent revision my $persistent=&make_persistent(); $r->print(<<BEGINNING); <html> <head> <title>The LearningOnline Network with CAPA</title> BEGINNING $r->print(<<RESULTS); </head> <body bgcolor="#ffffff"> <img align='right' src='/adm/lonIcons/lonlogos.gif' /> <h1>Search Catalog</h1> <form method="post" action="/adm/searchcat"> $persistent <input type='button' value='Revise search request' onClick='this.form.submit();' /> $closebutton <hr /> <h3>Helpful Message</h3> <p> $message </p> </body> </html> RESULTS } # --------- settings whenever the user causes the search window to be launched sub start_fresh_session { delete $hash{'mode_catalog'}; foreach (keys %hash) { if ($_ =~ /^pre_/) { delete $hash{$_}; } if ($_ =~ /^store/) { delete $hash{$_}; } } } # ----------------------------------------------- send javascript to popwin sub popwin_js { # Print javascript out to popwin, but make sure we dont generate # any javascript errors in doing so. my ($r,$text) = @_; $r->print(<<"END"); <script type="text/javascript"> if (! popwin.closed) { $text } </script> END $r->rflush(); } sub popwin_imgupdate { my ($r,$imgnum,$icon) = @_; &popwin_js($r,'popwin.document.img'.$imgnum.'.'. 'src="/adm/lonIcons/'.$icon.'";'); } 1; __END__ =pod =back =over 4 =head1 HANDLER SUBROUTINE This routine is called by Apache and mod_perl. =over 4 =item * configure dynamic components of interface =item * determine current user =item * see if a search invocation should be done =item * else, begin building search interface to output =item * compute date selection boxes =item * compute customized metadata field =item * print screen =back =head1 OTHER SUBROUTINES =over 4 =item * get_unprocessed_cgi() : reads in critical name/value pairs that may have not been processed and passed into %ENV by the web server =item * make_persistent() : makes a set of hidden HTML fields to make SQL search interface information to be persistent =back WEB INTERFACE COMPONENT FUNCTIONS =over 4 =item * simpletextfield(name,value) : returns HTML formatted string for simple text field =item * simplecheckbox(name,value) : returns HTML formatted string for simple checkbox =item * searchphrasefield(title,name,value) : returns HTML formatted string for a search expression phrase field =item * dateboxes(name, defaultmonth, defaultday, defaultyear) : returns HTML formatted string for a calendar date =item * selectbox(title,name,value,%HASH=options) : returns HTML formatted string for a selection box field =back SEARCH FUNCTIONS =over 4 =item * advancedsearch(server reference, environment reference) : perform a complex multi-field logical query =item * basicsearch(server reference, environment reference) : perform a simple single-field logical query =item * build_SQL_query(field name, logic) : builds a SQL query string from a logical expression with AND/OR keywords =item * build_custommetadata_query(field_name, logic_statement) : builds a perl regular expression from a logical expression with AND/OR keywords =item * recursive_SQL_query_build(field name, reverse notation expression) : builds a SQL query string from a reverse notation expression logical expression with AND/OR keywords =item * build_date_queries(cmonth1, cday1, cyear1, cmonth2, cday2, cyear2, lmonth1, lday1, lyear1, lmonth2, lday2, lyear2) : Builds a SQL logic query to check time/date entries. =back OUTPUTTING RESULTS FUNCTION =over 4 =item * output_results(output mode, server reference, environment reference, reply list reference) : outputs results from search =back DIFFERENT WAYS TO VIEW METADATA RECORDS =over 4 =item * detailed_citation_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : see metadata viewing notes below =item * summary_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : see metadata viewing notes below =item * fielded_format_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : see metadata viewing notes below =item * xml_sgml_view(ORDERED METADATA LIST FOR A RESULT OBJECT INSTANCE) : see metadata viewing notes below =back _____________________________________________________________________ | * Metadata viewing notes | | Output is a HTML-ified string. | | Input arguments are title, author, subject, url, keywords, version, | | notes, short abstract, mime, language, creation date, | | last revision date, owner, copyright, hostname, httphost, and | | extra custom metadata to show. | --------------------------------------------------------------------- TEST CONDITIONAL FUNCTIONS =over 4 =item * filled(field) : determines whether a given field has been filled =back ERROR FUNCTIONS =over 4 =item * output_blank_field_error(server reference) : outputs a message saying that more fields need to be filled in =item * output_date_error(server reference, error message) : outputs an error message specific to bad date format. =back =cut