[537] | 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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[214] | 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 |
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| 32 |
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[315] | 33 | $next_classify_num = 1;
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[214] | 34 |
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[811] | 35 | sub load_classifiers {
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| 36 | my ($classify_list) = @_;
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| 37 | my @classify_objects = ();
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| 38 |
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| 39 | foreach $classifyoption (@$classify_list) {
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[214] | 40 |
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[811] | 41 | # get the classifier name
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| 42 | my $classname = shift @$classifyoption;
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| 43 | next unless defined $classname;
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[214] | 44 |
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[811] | 45 | # find the classifier
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| 46 | my $colclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'},"perllib/classify",
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| 47 | "${classname}.pm");
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| 48 | my $mainclassname = &util::filename_cat($ENV{'GSDLHOME'},"perllib/classify",
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| 49 | "${classname}.pm");
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[214] | 50 |
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[811] | 51 | if (-e $colclassname) { require $colclassname; }
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| 52 | elsif (-e $mainclassname) { require $mainclassname; }
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| 53 | else { die "ERROR - couldn't find classifier \"$classname\"\n"; }
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[214] | 54 |
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[811] | 55 | # create the classify object
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| 56 | my ($classobj);
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| 57 | map { $_ = "\"$_\""; } @$classifyoption;
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| 58 | my $options = join (",", @$classifyoption);
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| 59 | eval ("\$classobj = new \$classname($options)");
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| 60 | die "$@" if $@;
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| 61 |
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| 62 | # add this object to the list
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| 63 | push (@classify_objects, $classobj);
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| 64 | }
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| 65 |
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| 66 | return \@classify_objects;
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[214] | 67 | }
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| 68 |
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| 69 | # init_classifiers resets all the classifiers and readys them to process
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[315] | 70 | # the documents.
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[214] | 71 | sub init_classifiers {
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| 72 | my ($classifiers) = @_;
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| 73 |
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| 74 | foreach $classobj (@$classifiers) {
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| 75 | $classobj->init();
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | # classify_doc lets each of the classifiers classify a document
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| 80 | sub classify_doc {
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| 81 | my ($classifiers, $doc_obj) = @_;
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| 82 |
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| 83 | foreach $classobj (@$classifiers) {
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| 84 | $classobj->classify($doc_obj);
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | # output_classify_info outputs all the info needed for the classification
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| 89 | # to the gdbm
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| 90 | sub output_classify_info {
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[315] | 91 | my ($classifiers, $handle, $allclassifications) = @_;
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[214] | 92 | # $handle = "main::STDOUT";
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| 93 |
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[315] | 94 | # create a classification containing all the info
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| 95 | my $classifyinfo = {'classifyOID'=>'browse',
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| 96 | 'contains'=>[]};
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| 97 |
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| 98 | # get each of the classifications
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[214] | 99 | foreach $classobj (@$classifiers) {
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[315] | 100 | my $tempinfo = $classobj->get_classify_info();
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| 101 | $tempinfo->{'classifyOID'} = "CL$next_classify_num";
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| 102 | $next_classify_num++;
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| 103 | push (@{$classifyinfo->{'contains'}}, $tempinfo);
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[214] | 104 | }
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| 105 |
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[315] | 106 | &print_classify_info ($handle, $classifyinfo, "", $allclassifications);
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[214] | 107 | }
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| 108 |
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[315] | 109 | sub print_classify_info {
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| 110 | my ($handle, $classifyinfo, $OID, $allclassifications) = @_;
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[831] | 111 |
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[315] | 112 | $OID =~ s/^\.+//; # just for good luck
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[214] | 113 |
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[315] | 114 | # book information is printed elsewhere
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| 115 | return if (defined ($classifyinfo->{'OID'}));
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| 116 |
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| 117 | # don't want empty classifications
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[637] | 118 | if ($allclassifications || &check_contents ($classifyinfo) > 0) {
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[315] | 119 |
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| 120 | $OID = $classifyinfo->{'classifyOID'} if defined ($classifyinfo->{'classifyOID'});
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| 121 |
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| 122 | my $outputtext = "[$OID]\n";
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| 123 | $outputtext .= "<doctype>classify\n";
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| 124 | $outputtext .= "<hastxt>0\n";
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[652] | 125 | $outputtext .= "<childtype>$classifyinfo->{'childtype'}\n"
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| 126 | if defined $classifyinfo->{'childtype'};
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| 127 | $outputtext .= "<Title>$classifyinfo->{'Title'}\n"
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| 128 | if defined $classifyinfo->{'Title'};
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| 129 | $outputtext .= "<numleafdocs>$classifyinfo->{'numleafdocs'}\n"
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| 130 | if defined $classifyinfo->{'numleafdocs'};
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| 131 | $outputtext .= "<thistype>$classifyinfo->{'thistype'}\n"
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| 132 | if defined $classifyinfo->{'thistype'};
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| 133 |
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[315] | 134 |
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[831] | 135 | my $contains_text = "<contains>";
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| 136 | my $mdoffset_text = "<mdoffset>";
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[315] | 137 |
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| 138 | my $next_subOID = 1;
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| 139 | my $first = 1;
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| 140 | foreach $tempinfo (@{$classifyinfo->{'contains'}}) {
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| 141 | # empty contents were made undefined by clean_contents()
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| 142 | next unless defined $tempinfo;
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| 143 |
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[831] | 144 | $contains_text .= ";" unless $first;
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| 145 | $mdoffset_text .= ";" unless $first;
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[315] | 146 | $first = 0;
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| 147 |
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| 148 | if (defined ($tempinfo->{'classifyOID'})) {
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[831] | 149 | $contains_text .= $tempinfo->{'classifyOID'};
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[315] | 150 | &print_classify_info ($handle, $tempinfo, $tempinfo->{'classifyOID'},
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| 151 | $allclassifications);
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| 152 | } elsif (defined ($tempinfo->{'OID'})) {
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[831] | 153 | $contains_text .= $tempinfo->{'OID'};
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| 154 | $mdoffset_text .= $tempinfo->{'offset'}
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| 155 | if (defined ($tempinfo->{'offset'}))
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[315] | 156 | # note: we don't want to print the contents of the books
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| 157 | } else {
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[831] | 158 | $contains_text .= "\".$next_subOID";
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[315] | 159 | &print_classify_info ($handle, $tempinfo, "$OID.$next_subOID",
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| 160 | $allclassifications);
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| 161 | $next_subOID++;
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| 162 | }
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| 163 | }
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[831] | 164 |
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| 165 | $outputtext .= "$contains_text\n";
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| 166 | $outputtext .= "<mdtype>$classifyinfo->{'mdtype'}\n"
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| 167 | if defined $classifyinfo->{'mdtype'};
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| 168 | $outputtext .= "$mdoffset_text\n"
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| 169 | if ($mdoffset_text !~ m/^<mdoffset>;+$/);
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| 170 |
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[315] | 171 | $outputtext .= '-' x 70 . "\n";
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| 172 |
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| 173 | print $handle $outputtext;
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| 174 | }
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| 175 | }
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| 176 |
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[637] | 177 | sub check_contents {
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[315] | 178 | my ($classifyinfo) = @_;
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[637] | 179 | my $num_leaf_docs = 0;
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| 180 | my $sub_num_leaf_docs = 0;
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[315] | 181 |
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[637] | 182 | return $classifyinfo->{'numleafdocs'} if (defined $classifyinfo->{'numleafdocs'});
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| 183 |
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[315] | 184 | foreach $content (@{$classifyinfo->{'contains'}}) {
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| 185 | if (defined $content->{'OID'}) {
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| 186 | # found a book
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[637] | 187 | $num_leaf_docs ++;
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| 188 | } elsif (($sub_num_leaf_docs = &check_contents ($content)) > 0) {
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[315] | 189 | # there's a book somewhere below
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[637] | 190 | $num_leaf_docs += $sub_num_leaf_docs;
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[315] | 191 | } else {
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| 192 | # section contains no books so we want to remove
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| 193 | # it from its parents contents
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| 194 | $content = undef;
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| 195 | }
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| 196 | }
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[637] | 197 |
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| 198 | $classifyinfo->{'numleafdocs'} = $num_leaf_docs;
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| 199 | return $num_leaf_docs;
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[315] | 200 | }
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| 201 |
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[214] | 202 | 1;
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