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