| 1 | ###########################################################################
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| 2 | #
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| 3 | # classify.pm --
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | # functions to handle classifiers
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| 27 |
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| 28 | package classify;
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| 29 |
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| 30 | require util;
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| 31 | require AllList;
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| 32 | use gsprintf;
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| 33 |
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| 34 | #use GDBM_File;
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| 35 | use unbuildutil;
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| 36 |
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| 37 |
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| 38 | sub gsprintf
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| 39 | {
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| 40 | return &gsprintf::gsprintf(@_);
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| 41 | }
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| 42 |
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| 43 |
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| 44 | $next_classify_num = 1;
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| 45 | $oid_to_clids = {};
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| 46 |
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| 47 | sub load_classifier_for_info {
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| 48 | my ($classifier) = shift @_;
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| 49 |
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| 50 | # find the classifier
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| 51 | my $customclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "custom", $ENV{'GSDLCOLLECTION'},
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| 52 | "perllib", "classify", "${classifier}.pm");
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| 53 | my $colclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "perllib", "classify", "${classifier}.pm");
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| 54 | my $mainclassname = &util::filename_cat($ENV{'GSDLHOME'}, "perllib", "classify", "${classifier}.pm");
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| 55 |
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| 56 | if (-e $customclassname) { require $customclassname; }
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| 57 | elsif (-e $colclassname) { require $colclassname; }
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| 58 | elsif (-e $mainclassname) { require $mainclassname; }
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| 59 | else {
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| 60 | &gsprintf(STDERR, "{classify.could_not_find_classifier}\n", $classifier) && die "\n";
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| 61 | }
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| 62 | my ($classobj);
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| 63 | my $options = "-gsdlinfo";
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| 64 | eval ("\$classobj = new \$classifier([],[$options])");
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| 65 | die "$@" if $@;
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| 66 |
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| 67 | return $classobj;
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| 68 | }
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| 69 |
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| 70 | sub load_classifiers {
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| 71 | my ($classify_list, $build_dir, $outhandle) = @_;
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| 72 | my @classify_objects = ();
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| 73 | my $classify_number = 1;
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| 74 |
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| 75 | my $colclassdir = &util::filename_cat($ENV{'GSDLCOLLECTDIR'},"perllib/classify");
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| 76 | unshift (@INC, $colclassdir);
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| 77 |
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| 78 | foreach $classifyoption (@$classify_list) {
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| 79 |
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| 80 | # get the classifier name
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| 81 | my $classname = shift @$classifyoption;
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| 82 | next unless defined $classname;
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| 83 |
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| 84 | # find the classifier
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| 85 | my $customclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "custom", $ENV{'GSDLCOLLECTION'},
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| 86 | "perllib", "classify", "${classname}.pm");
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| 87 | my $colclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "perllib", "classify", "${classname}.pm");
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| 88 | my $mainclassname = &util::filename_cat($ENV{'GSDLHOME'}, "perllib", "classify", "${classname}.pm");
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| 89 |
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| 90 | if (-e $customclassname) { require $customclassname; }
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| 91 | elsif (-e $colclassname) { require $colclassname; }
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| 92 | elsif (-e $mainclassname) { require $mainclassname; }
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| 93 | else { &gsprintf(STDERR, "{classify.could_not_find_classifier}\n", $classname) && die "\n";
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| 94 | # die "ERROR - couldn't find classifier \"$classname\"\n";
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| 95 | }
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| 96 |
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| 97 | # create the classify object
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| 98 | my ($classobj);
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| 99 |
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| 100 | my @newoptions;
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| 101 |
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| 102 | # do these first so they can be overriden by user supplied options
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| 103 | push @newoptions, "-builddir", "$build_dir" if ($build_dir);
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| 104 | push @newoptions, "-outhandle", "$outhandle" if ($outhandle);
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| 105 | push @newoptions, "-verbosity", "2";
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| 106 |
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| 107 | # backwards compatability hack: if the classifier options are
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| 108 | # in "x=y" format, convert them to parsearg ("-x y") format.
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| 109 | my ($opt, $key, $value);
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| 110 | foreach $opt (@$classifyoption) {
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| 111 | # if ($opt =~ /^(\w+)=(.*)$/) {
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| 112 | # push @newoptions, "-$1", $2;
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| 113 | # } else {
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| 114 | push @newoptions, $opt;
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| 115 | #}
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| 116 | }
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| 117 |
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| 118 | map { $_ = "\"$_\""; } @newoptions;
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| 119 | my $options .= join (",", @newoptions);
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| 120 |
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| 121 |
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| 122 | eval ("\$classobj = new \$classname([],[$options])");
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| 123 | die "$@" if $@;
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| 124 |
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| 125 | $classobj->set_number($classify_number);
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| 126 | $classify_number ++;
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| 127 |
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| 128 | # add this object to the list
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| 129 | push (@classify_objects, $classobj);
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| 130 | }
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| 131 |
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| 132 | my ($classobj);
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| 133 | eval ("\$classobj = new AllList()");
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| 134 | die "$@" if $@;
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| 135 | push (@classify_objects, $classobj);
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| 136 |
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| 137 | return \@classify_objects;
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| 138 | }
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| 139 |
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| 140 | # init_classifiers resets all the classifiers and readys them to process
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| 141 | # the documents.
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| 142 | sub init_classifiers {
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| 143 | my ($classifiers) = @_;
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| 144 |
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| 145 | foreach $classobj (@$classifiers) {
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| 146 | $classobj->init();
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| 147 | }
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| 148 | }
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| 149 |
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| 150 |
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| 151 |
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| 152 | # takes a hashref containing the metadata for a gdbmfile entry, and extracts
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| 153 | # the childrens numbers (from the 'contains' entry).
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| 154 | # assumes format is ".1;".2;".3
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| 155 | sub get_children {
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| 156 | my ($doc_db_hash) = @_;
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| 157 |
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| 158 | my $children = undef;
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| 159 |
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| 160 | $childs = $doc_db_hash->{'contains'};
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| 161 | if (defined ($childs)) {
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| 162 | $childs =~ s/\@$//; #remove trailing @
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| 163 | $childs =~ s/^\"\.//; #remove initial ".
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| 164 | @$children = split /\;\"\./, $childs;
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| 165 |
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| 166 | }
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| 167 |
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| 168 | return $children;
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| 169 | }
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| 170 |
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| 171 |
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| 172 | sub recurse_sections {
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| 173 | my ($doc_obj, $children, $parentoid, $parentsection, $gdbm_recs) = @_;
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| 174 |
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| 175 | return if (!defined $children);
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| 176 |
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| 177 | foreach my $child (sort { $a <=> $b} @$children) {
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| 178 | $doc_obj->create_named_section("$parentsection.$child");
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| 179 | my $doc_db_rec = $gdbm_recs->{"$parentoid.$child"};
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| 180 | my $doc_db_hash = db_rec_to_hash($doc_db_rec);
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| 181 |
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| 182 | # get child's children
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| 183 | my $newchildren = &get_children($doc_db_hash);
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| 184 |
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| 185 | # add content for current section
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| 186 | add_section_content($doc_obj, "$parentsection.$child", $doc_db_hash);
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| 187 |
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| 188 | # process all the children if there are any
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| 189 | if (defined ($newchildren))
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| 190 | {
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| 191 | recurse_sections($doc_obj, $newchildren, "$parentoid.$child",
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| 192 | "$parentsection.$child", $gdbm_recs);
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| 193 | }
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| 194 | }
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| 195 | }
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| 196 |
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| 197 |
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| 198 | sub add_section_content {
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| 199 | my ($doc_obj, $cursection, $doc_db_hash) = @_;
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| 200 |
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| 201 | foreach $key (keys %$doc_db_hash) {
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| 202 | #don't need to store these metadata
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| 203 | next if $key =~ /(thistype|childtype|contains|docnum|doctype|classifytype)/i;
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| 204 | # but do want things like hastxt and archivedir
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| 205 | my @items = split /@/, $doc_db_hash->{$key};
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| 206 | map {$doc_obj->add_metadata ($cursection, $key, $_); } @items;
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| 207 |
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| 208 | }
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| 209 | }
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| 210 |
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| 211 |
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| 212 | # gets all the metadata from a gdbm file entry, and puts it into a hashref
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| 213 | sub db_rec_to_hash {
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| 214 |
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| 215 | my ($gdb_str_ref) = @_;
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| 216 |
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| 217 | my $hashref = {};
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| 218 |
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| 219 | my @entries = split(/\n/, $gdb_str_ref);
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| 220 | foreach $entry (@entries) {
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| 221 | my($key, $value) = ($entry =~ /^<([^>]*)>(.*?)$/ );
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| 222 | $hashref->{$key} .= '@' if defined $hashref->{$key};
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| 223 | $hashref->{$key} .= $value;
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| 224 |
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| 225 | }
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| 226 |
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| 227 | return $hashref;
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| 228 | }
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| 229 |
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| 230 |
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| 231 | sub reconstruct_doc_objs_metadata
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| 232 | {
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| 233 | my ($fulldbname) = @_;
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| 234 |
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| 235 | # tie %gdbm_recs, 'GDBM_File', $fulldbname, &GDBM_WRCREAT, 0640;
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| 236 |
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| 237 | my %gdbm_recs;
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| 238 | &unbuildutil::read_gdbm($fulldbname,\%gdbm_recs);
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| 239 |
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| 240 |
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| 241 | # dig out top level doc sections
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| 242 | my %top_sections = ();
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| 243 | my %top_docnums = ();
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| 244 | foreach my $key ( keys %gdbm_recs )
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| 245 | {
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| 246 | my $md_rec = $gdbm_recs{$key};
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| 247 | my $md_hash = db_rec_to_hash($md_rec);
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| 248 |
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| 249 | if ((defined $md_hash->{'doctype'}) && ($md_hash->{'doctype'} eq "doc")) {
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| 250 | next if ($key =~ m/\./);
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| 251 | $top_sections{$key} = $md_hash;
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| 252 | $top_docnums{$key} = $md_hash->{'docnum'};
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| 253 | }
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| 254 | }
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| 255 |
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| 256 | # for greenstone document objects based on metadata in gdbm file
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| 257 | my @all_docs = ();
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| 258 | # we need to make sure the documents were processed in the same order as
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| 259 | # before, so sort based on their docnums
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| 260 | foreach my $oid ( sort { $top_docnums{$a} <=> $top_docnums{$b} } keys %top_sections )
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| 261 | {
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| 262 | my $doc_db_hash = $top_sections{$oid};
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| 263 |
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| 264 | my $doc_obj = new doc();
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| 265 | $doc_obj->set_OID($oid);
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| 266 | my $top = $doc_obj->get_top_section();
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| 267 | add_section_content ($doc_obj, $top, $doc_db_hash);
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| 268 | my $children = &get_children($doc_db_hash);
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| 269 | recurse_sections($doc_obj, $children, $oid, $top, \%gdbm_recs);
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| 270 |
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| 271 | push(@all_docs,$doc_obj);
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| 272 | }
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| 273 |
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| 274 | # untie %gdbm_recs;
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| 275 |
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| 276 | return \@all_docs;
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| 277 | }
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| 278 |
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| 279 |
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| 280 |
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| 281 |
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| 282 |
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| 283 | # classify_doc lets each of the classifiers classify a document
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| 284 | sub classify_doc {
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| 285 | my ($classifiers, $doc_obj) = @_;
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| 286 |
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| 287 | foreach $classobj (@$classifiers) {
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| 288 | my $title = $classobj->{'title'};
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| 289 | $classobj->classify($doc_obj);
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| 290 | }
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| 291 | }
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| 292 |
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| 293 | # output_classify_info outputs all the info needed for the classification
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| 294 | # to the gdbm
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| 295 | sub output_classify_info {
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| 296 | my ($classifiers, $handle, $remove_empty_classifications, $gli) = @_;
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| 297 | # $handle = "main::STDOUT";
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| 298 |
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| 299 | $gli = 0 unless defined $gli;
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| 300 |
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| 301 | # create a classification containing all the info
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| 302 | my $classifyinfo = {'classifyOID'=>'browse',
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| 303 | 'contains'=>[]};
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| 304 |
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| 305 | # get each of the classifications
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| 306 | foreach $classobj (@$classifiers) {
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| 307 | my $tempinfo = $classobj->get_classify_info($gli);
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| 308 | my $classID = $tempinfo->{'classifyOID'};
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| 309 |
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| 310 | $tempinfo->{'classifyOID'} = "CL$next_classify_num" unless defined($tempinfo->{'classifyOID'});
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| 311 | $next_classify_num++;
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| 312 |
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| 313 | print STDERR "*** outputting information for classifier: $tempinfo->{'classifyOID'}\n";
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| 314 |
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| 315 | push (@{$classifyinfo->{'contains'}}, $tempinfo);
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| 316 | }
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| 317 |
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| 318 | &print_classify_info ($handle, $classifyinfo, "", $remove_empty_classifications);
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| 319 | }
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| 320 |
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| 321 | sub print_classify_info {
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| 322 | my ($handle, $classifyinfo, $OID, $remove_empty_classifications) = @_;
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| 323 |
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| 324 | $OID =~ s/^\.+//; # just for good luck
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| 325 |
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| 326 | # book information is printed elsewhere
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| 327 | return if (defined ($classifyinfo->{'OID'}));
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| 328 |
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| 329 | # don't want empty classifications
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| 330 | return if (&check_contents ($classifyinfo, $remove_empty_classifications) == 0 && $remove_empty_classifications);
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| 331 |
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| 332 | $OID = $classifyinfo->{'classifyOID'} if defined ($classifyinfo->{'classifyOID'});
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| 333 |
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| 334 | my $outputtext = "[$OID]\n";
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| 335 | $outputtext .= "<doctype>classify\n";
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| 336 | $outputtext .= "<hastxt>0\n";
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| 337 | $outputtext .= "<childtype>$classifyinfo->{'childtype'}\n"
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| 338 | if defined $classifyinfo->{'childtype'};
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| 339 | $outputtext .= "<Title>$classifyinfo->{'Title'}\n"
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| 340 | if defined $classifyinfo->{'Title'};
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| 341 | $outputtext .= "<numleafdocs>$classifyinfo->{'numleafdocs'}\n"
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| 342 | if defined $classifyinfo->{'numleafdocs'};
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| 343 | $outputtext .= "<thistype>$classifyinfo->{'thistype'}\n"
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| 344 | if defined $classifyinfo->{'thistype'};
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| 345 | $outputtext .= "<parameters>$classifyinfo->{'parameters'}\n"
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| 346 | if defined $classifyinfo->{'parameters'};
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| 347 | $outputtext .= "<supportsmemberof>$classifyinfo->{'supportsmemberof'}\n"
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| 348 | if defined $classifyinfo->{'supportsmemberof'};
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| 349 |
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| 350 | my $contains_text = "<contains>";
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| 351 | my $mdoffset_text = "<mdoffset>";
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| 352 |
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| 353 | my $next_subOID = 1;
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| 354 | my $first = 1;
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| 355 | foreach $tempinfo (@{$classifyinfo->{'contains'}}) {
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| 356 | # empty contents were made undefined by clean_contents()
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| 357 | next unless defined $tempinfo;
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| 358 |
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| 359 | if (!defined ($tempinfo->{'classifyOID'}) ||
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| 360 | $tempinfo->{'classifyOID'} ne "oai") {
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| 361 | $contains_text .= ";" unless $first;
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| 362 | }
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| 363 | $mdoffset_text .= ";" unless $first;
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| 364 | $first = 0;
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| 365 |
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| 366 | if (defined ($tempinfo->{'classifyOID'})) {
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| 367 | if ($tempinfo->{'classifyOID'} ne "oai") {
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| 368 | $contains_text .= $tempinfo->{'classifyOID'};
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| 369 | }
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| 370 |
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| 371 | # Extra code for incremental building.
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| 372 | # We need to store a listing of the classifiers each DOI is in
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| 373 | my $clids = [];
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| 374 | #rint STDERR "==1. Recording reverse lookup for " . $tempinfo->{'classifyOID'} . "==\n";
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| 375 | if(defined($oid_to_clids->{$tempinfo->{'classifyOID'}})) {
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| 376 | #rint STDERR "Found existing array!\n";
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| 377 | $clids = $oid_to_clids->{$tempinfo->{'classifyOID'}};
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| 378 | }
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| 379 | #rint STDERR "Appended $OID to \"" . join(";", @{$clids}) . "\"\n";
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| 380 | push(@{$clids}, $OID);
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| 381 | $oid_to_clids->{$tempinfo->{'classifyOID'}} = $clids;
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| 382 | #rint STDERR "Result: \"" . join(";", @{$clids}) . "\"\n";
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| 383 |
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| 384 | &print_classify_info ($handle, $tempinfo, $tempinfo->{'classifyOID'},
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| 385 | $remove_empty_classifications);
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| 386 | } elsif (defined ($tempinfo->{'OID'})) {
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| 387 | $contains_text .= $tempinfo->{'OID'};
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| 388 | $mdoffset_text .= $tempinfo->{'offset'} if (defined ($tempinfo->{'offset'}));
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| 389 |
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| 390 |
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| 391 | # note: we don't want to print the contents of the books
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| 392 | # Extra code for incremental building.
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| 393 | # We need to store a listing of the classifiers each DOI is in
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| 394 | my $clids = [];
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| 395 | #rint STDERR "==2. Recording reverse lookup for " . $tempinfo->{'OID'} . "==\n";
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| 396 | if(defined($oid_to_clids->{$tempinfo->{'OID'}})) {
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| 397 | #rint STDERR "Found existing array!\n";
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| 398 | $clids = $oid_to_clids->{$tempinfo->{'OID'}};
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| 399 | }
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| 400 | #rint STDERR "Appended $OID to \"" . join(";", @{$clids}) . "\"\n";
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| 401 | push(@{$clids}, $OID);
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| 402 | $oid_to_clids->{$tempinfo->{'OID'}} = $clids;
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| 403 | #rint STDERR "Result: \"" . join(";", @{$clids}) . "\"\n";
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| 404 |
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| 405 |
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| 406 | } else {
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| 407 |
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| 408 | # Supress having top-level node in Collage classifier
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| 409 | # so no bookshelf icon appears, top-level, along with the
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| 410 | # applet
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| 411 |
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| 412 | if (!defined ($tempinfo->{'Title'}) || $tempinfo->{'Title'} ne "Collage") {
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| 413 | $contains_text .= "\".$next_subOID";
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| 414 | }
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| 415 |
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| 416 | # Extra code for incremental building.
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| 417 | # We need to store a listing of the classifiers each DOI is in
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| 418 | my $clids = [];
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| 419 | #rint STDERR "==3. Recording reverse lookup for $OID.$next_subOID==\n";
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| 420 | if(defined($oid_to_clids->{$OID . "." . $next_subOID})) {
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| 421 | #rint STDERR "Found existing array!\n";
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| 422 | $clids = $oid_to_clids->{$OID . "." . $next_subOID};
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| 423 | }
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| 424 | #rint STDERR "Appended $OID to \"" . join(";", @{$clids}) . "\"\n";
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| 425 | push(@{$clids}, $OID);
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| 426 | $oid_to_clids->{$OID . "." . $next_subOID} = $clids;
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| 427 | #rint STDERR "Result: \"" . join(";", @{$clids}) . "\"\n";
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| 428 |
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| 429 | &print_classify_info ($handle, $tempinfo, "$OID.$next_subOID",
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| 430 | $remove_empty_classifications);
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| 431 | $next_subOID++;
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| 432 | }
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| 433 | }
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| 434 |
|
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| 435 | $outputtext .= "$contains_text\n";
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| 436 | $outputtext .= "<mdtype>$classifyinfo->{'mdtype'}\n"
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| 437 | if defined $classifyinfo->{'mdtype'};
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| 438 | $outputtext .= "$mdoffset_text\n"
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| 439 | if ($mdoffset_text !~ m/^<mdoffset>;+$/);
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| 440 |
|
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| 441 | $outputtext .= '-' x 70 . "\n";
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| 442 |
|
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| 443 | print $handle $outputtext;
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| 444 |
|
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| 445 | }
|
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| 446 |
|
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| 447 | sub check_contents {
|
|---|
| 448 | my ($classifyinfo,$remove_empty_classifications) = @_;
|
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| 449 | $remove_empty_classifications = 0 unless ($remove_empty_classifications);
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| 450 | my $num_leaf_docs = 0;
|
|---|
| 451 | my $sub_num_leaf_docs = 0;
|
|---|
| 452 |
|
|---|
| 453 | return $classifyinfo->{'numleafdocs'} if (defined $classifyinfo->{'numleafdocs'});
|
|---|
| 454 |
|
|---|
| 455 | foreach $content (@{$classifyinfo->{'contains'}}) {
|
|---|
| 456 | if (defined $content->{'OID'}) {
|
|---|
| 457 | # found a book
|
|---|
| 458 | $num_leaf_docs ++;
|
|---|
| 459 | } elsif (($sub_num_leaf_docs = &check_contents ($content,$remove_empty_classifications)) > 0) {
|
|---|
| 460 | # there's a book somewhere below
|
|---|
| 461 | $num_leaf_docs += $sub_num_leaf_docs;
|
|---|
| 462 | } else {
|
|---|
| 463 | if ($remove_empty_classifications){
|
|---|
| 464 | # section contains no books so we want to remove
|
|---|
| 465 | # it from its parents contents
|
|---|
| 466 | $content = undef;
|
|---|
| 467 | }
|
|---|
| 468 | }
|
|---|
| 469 | }
|
|---|
| 470 |
|
|---|
| 471 | $classifyinfo->{'numleafdocs'} = $num_leaf_docs;
|
|---|
| 472 | return $num_leaf_docs;
|
|---|
| 473 | }
|
|---|
| 474 |
|
|---|
| 475 | 1;
|
|---|
