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 $customclassname;
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52 | if (defined($ENV{'GSDLCOLLECTION'}))
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53 | {
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54 | $customclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "custom", $ENV{'GSDLCOLLECTION'},
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55 | "perllib", "classify", "${classifier}.pm");
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56 | }
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57 | my $colclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "perllib", "classify", "${classifier}.pm");
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58 | my $mainclassname = &util::filename_cat($ENV{'GSDLHOME'}, "perllib", "classify", "${classifier}.pm");
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59 |
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60 | if (defined($customclassname) && -e $customclassname) { require $customclassname; }
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61 | elsif (-e $colclassname) { require $colclassname; }
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62 | elsif (-e $mainclassname) { require $mainclassname; }
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63 | else {
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64 | &gsprintf(STDERR, "{classify.could_not_find_classifier}\n", $classifier) && die "\n";
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65 | }
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66 | my ($classobj);
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67 | my $options = "-gsdlinfo";
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68 | eval ("\$classobj = new \$classifier([],[$options])");
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69 | die "$@" if $@;
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70 |
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71 | return $classobj;
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72 | }
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73 |
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74 | sub load_classifiers {
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75 | my ($classify_list, $build_dir, $outhandle) = @_;
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76 | my @classify_objects = ();
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77 | my $classify_number = 1;
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78 |
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79 | my $colclassdir = &util::filename_cat($ENV{'GSDLCOLLECTDIR'},"perllib/classify");
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80 | unshift (@INC, $colclassdir);
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81 |
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82 | foreach $classifyoption (@$classify_list) {
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83 |
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84 | # get the classifier name
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85 | my $classname = shift @$classifyoption;
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86 | next unless defined $classname;
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87 |
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88 | # find the classifier
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89 | my $customclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "custom", $ENV{'GSDLCOLLECTION'},
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90 | "perllib", "classify", "${classname}.pm");
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91 | my $colclassname = &util::filename_cat($ENV{'GSDLCOLLECTDIR'}, "perllib", "classify", "${classname}.pm");
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92 | my $mainclassname = &util::filename_cat($ENV{'GSDLHOME'}, "perllib", "classify", "${classname}.pm");
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93 |
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94 | if (-e $customclassname) { require $customclassname; }
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95 | elsif (-e $colclassname) { require $colclassname; }
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96 | elsif (-e $mainclassname) { require $mainclassname; }
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97 | else { &gsprintf(STDERR, "{classify.could_not_find_classifier}\n", $classname) && die "\n";
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98 | # die "ERROR - couldn't find classifier \"$classname\"\n";
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99 | }
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100 |
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101 | # create the classify object
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102 | my ($classobj);
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103 |
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104 | my @newoptions;
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105 |
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106 | # do these first so they can be overriden by user supplied options
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107 | push @newoptions, "-builddir", "$build_dir" if ($build_dir);
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108 | push @newoptions, "-outhandle", "$outhandle" if ($outhandle);
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109 | push @newoptions, "-verbosity", "2";
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110 |
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111 | # backwards compatability hack: if the classifier options are
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112 | # in "x=y" format, convert them to parsearg ("-x y") format.
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113 | my ($opt, $key, $value);
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114 | foreach $opt (@$classifyoption) {
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115 | # if ($opt =~ /^(\w+)=(.*)$/) {
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116 | # push @newoptions, "-$1", $2;
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117 | # } else {
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118 | push @newoptions, $opt;
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119 | #}
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120 | }
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121 |
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122 | map { $_ = "\"$_\""; } @newoptions;
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123 | my $options .= join (",", @newoptions);
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124 |
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125 |
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126 | eval ("\$classobj = new \$classname([],[$options])");
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127 | die "$@" if $@;
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128 |
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129 | $classobj->set_number($classify_number);
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130 | $classify_number ++;
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131 |
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132 | # add this object to the list
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133 | push (@classify_objects, $classobj);
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134 | }
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135 |
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136 | my ($classobj);
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137 | eval ("\$classobj = new AllList()");
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138 | die "$@" if $@;
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139 | push (@classify_objects, $classobj);
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140 |
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141 | return \@classify_objects;
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142 | }
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143 |
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144 | # init_classifiers resets all the classifiers and readys them to process
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145 | # the documents.
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146 | sub init_classifiers {
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147 | my ($classifiers) = @_;
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148 |
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149 | foreach $classobj (@$classifiers) {
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150 | $classobj->init();
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151 | }
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152 | }
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153 |
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154 |
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155 |
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156 | # takes a hashref containing the metadata for a gdbmfile entry, and extracts
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157 | # the childrens numbers (from the 'contains' entry).
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158 | # assumes format is ".1;".2;".3
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159 | sub get_children {
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160 | my ($doc_db_hash) = @_;
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161 |
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162 | my $children = undef;
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163 |
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164 | $childs = $doc_db_hash->{'contains'};
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165 | if (defined ($childs)) {
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166 | $childs =~ s/\@$//; #remove trailing @
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167 | $childs =~ s/^\"\.//; #remove initial ".
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168 | @$children = split /\;\"\./, $childs;
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169 |
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170 | }
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171 |
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172 | return $children;
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173 | }
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174 |
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175 |
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176 | sub recurse_sections {
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177 | my ($doc_obj, $children, $parentoid, $parentsection, $gdbm_recs) = @_;
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178 |
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179 | return if (!defined $children);
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180 |
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181 | foreach my $child (sort { $a <=> $b} @$children) {
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182 | $doc_obj->create_named_section("$parentsection.$child");
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183 | my $doc_db_rec = $gdbm_recs->{"$parentoid.$child"};
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184 | my $doc_db_hash = db_rec_to_hash($doc_db_rec);
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185 |
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186 | # get child's children
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187 | my $newchildren = &get_children($doc_db_hash);
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188 |
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189 | # add content for current section
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190 | add_section_content($doc_obj, "$parentsection.$child", $doc_db_hash);
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191 |
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192 | # process all the children if there are any
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193 | if (defined ($newchildren))
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194 | {
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195 | recurse_sections($doc_obj, $newchildren, "$parentoid.$child",
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196 | "$parentsection.$child", $gdbm_recs);
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197 | }
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198 | }
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199 | }
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200 |
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201 |
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202 | sub add_section_content {
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203 | my ($doc_obj, $cursection, $doc_db_hash) = @_;
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204 |
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205 | foreach $key (keys %$doc_db_hash) {
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206 | #don't need to store these metadata
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207 | next if $key =~ /(thistype|childtype|contains|docnum|doctype|classifytype)/i;
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208 | # but do want things like hastxt and archivedir
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209 | my @items = split /@/, $doc_db_hash->{$key};
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210 | map {$doc_obj->add_metadata ($cursection, $key, $_); } @items;
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211 |
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212 | }
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213 | }
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214 |
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215 |
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216 | # gets all the metadata from a gdbm file entry, and puts it into a hashref
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217 | sub db_rec_to_hash {
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218 |
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219 | my ($gdb_str_ref) = @_;
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220 |
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221 | my $hashref = {};
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222 |
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223 | my @entries = split(/\n/, $gdb_str_ref);
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224 | foreach $entry (@entries) {
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225 | my($key, $value) = ($entry =~ /^<([^>]*)>(.*?)$/ );
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226 | $hashref->{$key} .= '@' if defined $hashref->{$key};
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227 | $hashref->{$key} .= $value;
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228 |
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229 | }
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230 |
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231 | return $hashref;
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232 | }
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233 |
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234 |
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235 | sub reconstruct_doc_objs_metadata
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236 | {
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237 | my ($fulldbname) = @_;
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238 |
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239 | # tie %gdbm_recs, 'GDBM_File', $fulldbname, &GDBM_WRCREAT, 0640;
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240 |
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241 | my %gdbm_recs;
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242 | &unbuildutil::read_gdbm($fulldbname,\%gdbm_recs);
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243 |
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244 |
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245 | # dig out top level doc sections
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246 | my %top_sections = ();
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247 | my %top_docnums = ();
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248 | foreach my $key ( keys %gdbm_recs )
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249 | {
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250 | my $md_rec = $gdbm_recs{$key};
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251 | my $md_hash = db_rec_to_hash($md_rec);
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252 |
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253 | if ((defined $md_hash->{'doctype'}) && ($md_hash->{'doctype'} eq "doc")) {
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254 | next if ($key =~ m/\./);
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255 | $top_sections{$key} = $md_hash;
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256 | $top_docnums{$key} = $md_hash->{'docnum'};
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257 | }
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258 | }
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259 |
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260 | # for greenstone document objects based on metadata in gdbm file
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261 | my @all_docs = ();
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262 | # we need to make sure the documents were processed in the same order as
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263 | # before, so sort based on their docnums
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264 | foreach my $oid ( sort { $top_docnums{$a} <=> $top_docnums{$b} } keys %top_sections )
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265 | {
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266 | my $doc_db_hash = $top_sections{$oid};
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267 |
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268 | my $doc_obj = new doc();
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269 | $doc_obj->set_OID($oid);
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270 | my $top = $doc_obj->get_top_section();
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271 | add_section_content ($doc_obj, $top, $doc_db_hash);
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272 | my $children = &get_children($doc_db_hash);
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273 | recurse_sections($doc_obj, $children, $oid, $top, \%gdbm_recs);
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274 |
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275 | push(@all_docs,$doc_obj);
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276 | }
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277 |
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278 | # untie %gdbm_recs;
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279 |
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280 | return \@all_docs;
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281 | }
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282 |
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283 |
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284 |
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285 |
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286 |
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287 | # classify_doc lets each of the classifiers classify a document
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288 | sub classify_doc {
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289 | my ($classifiers, $doc_obj) = @_;
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290 |
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291 | foreach $classobj (@$classifiers) {
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292 | my $title = $classobj->{'title'};
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293 | $classobj->classify($doc_obj);
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294 | }
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295 | }
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296 |
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297 | # output_classify_info outputs all the info needed for the classification
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298 | # to the gdbm
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299 | sub output_classify_info {
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300 | my ($classifiers, $handle, $remove_empty_classifications, $gli) = @_;
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301 | # $handle = "main::STDOUT";
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302 |
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303 | $gli = 0 unless defined $gli;
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304 |
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305 | # create a classification containing all the info
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306 | my $classifyinfo = {'classifyOID'=>'browse',
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307 | 'contains'=>[]};
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308 |
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309 | # get each of the classifications
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310 | foreach $classobj (@$classifiers) {
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311 | my $tempinfo = $classobj->get_classify_info($gli);
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312 | my $classID = $tempinfo->{'classifyOID'};
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313 |
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314 | $tempinfo->{'classifyOID'} = "CL$next_classify_num" unless defined($tempinfo->{'classifyOID'});
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315 | $next_classify_num++;
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316 |
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317 | print STDERR "*** outputting information for classifier: $tempinfo->{'classifyOID'}\n";
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318 |
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319 | push (@{$classifyinfo->{'contains'}}, $tempinfo);
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320 | }
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321 |
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322 | &print_classify_info ($handle, $classifyinfo, "", $remove_empty_classifications);
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323 | }
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324 |
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325 | sub print_classify_info {
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326 | my ($handle, $classifyinfo, $OID, $remove_empty_classifications) = @_;
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327 |
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328 | $OID =~ s/^\.+//; # just for good luck
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329 |
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330 | # book information is printed elsewhere
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331 | return if (defined ($classifyinfo->{'OID'}));
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332 |
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333 | # don't want empty classifications
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334 | return if (&check_contents ($classifyinfo, $remove_empty_classifications) == 0 && $remove_empty_classifications);
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335 |
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336 | $OID = $classifyinfo->{'classifyOID'} if defined ($classifyinfo->{'classifyOID'});
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337 |
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338 | my $outputtext = "[$OID]\n";
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339 | $outputtext .= "<doctype>classify\n";
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340 | $outputtext .= "<hastxt>0\n";
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341 | $outputtext .= "<childtype>$classifyinfo->{'childtype'}\n"
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342 | if defined $classifyinfo->{'childtype'};
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343 | $outputtext .= "<Title>$classifyinfo->{'Title'}\n"
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344 | if defined $classifyinfo->{'Title'};
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345 | $outputtext .= "<numleafdocs>$classifyinfo->{'numleafdocs'}\n"
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346 | if defined $classifyinfo->{'numleafdocs'};
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347 | $outputtext .= "<thistype>$classifyinfo->{'thistype'}\n"
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348 | if defined $classifyinfo->{'thistype'};
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349 | $outputtext .= "<parameters>$classifyinfo->{'parameters'}\n"
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350 | if defined $classifyinfo->{'parameters'};
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351 | $outputtext .= "<supportsmemberof>$classifyinfo->{'supportsmemberof'}\n"
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352 | if defined $classifyinfo->{'supportsmemberof'};
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353 |
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354 | my $contains_text = "<contains>";
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355 | my $mdoffset_text = "<mdoffset>";
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356 |
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357 | my $next_subOID = 1;
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358 | my $first = 1;
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359 | foreach $tempinfo (@{$classifyinfo->{'contains'}}) {
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360 | # empty contents were made undefined by clean_contents()
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361 | next unless defined $tempinfo;
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362 |
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363 | if (!defined ($tempinfo->{'classifyOID'}) ||
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364 | $tempinfo->{'classifyOID'} ne "oai") {
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365 | $contains_text .= ";" unless $first;
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366 | }
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367 | $mdoffset_text .= ";" unless $first;
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368 | $first = 0;
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369 |
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370 | if (defined ($tempinfo->{'classifyOID'})) {
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371 | if ($tempinfo->{'classifyOID'} ne "oai") {
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372 | $contains_text .= $tempinfo->{'classifyOID'};
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373 | }
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374 |
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375 | # Extra code for incremental building.
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376 | # We need to store a listing of the classifiers each DOI is in
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377 | my $clids = [];
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378 | #rint STDERR "==1. Recording reverse lookup for " . $tempinfo->{'classifyOID'} . "==\n";
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379 | if(defined($oid_to_clids->{$tempinfo->{'classifyOID'}})) {
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380 | #rint STDERR "Found existing array!\n";
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381 | $clids = $oid_to_clids->{$tempinfo->{'classifyOID'}};
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382 | }
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383 | #rint STDERR "Appended $OID to \"" . join(";", @{$clids}) . "\"\n";
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384 | push(@{$clids}, $OID);
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385 | $oid_to_clids->{$tempinfo->{'classifyOID'}} = $clids;
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386 | #rint STDERR "Result: \"" . join(";", @{$clids}) . "\"\n";
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387 |
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388 | &print_classify_info ($handle, $tempinfo, $tempinfo->{'classifyOID'},
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389 | $remove_empty_classifications);
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390 | } elsif (defined ($tempinfo->{'OID'})) {
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391 | $contains_text .= $tempinfo->{'OID'};
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392 | $mdoffset_text .= $tempinfo->{'offset'} if (defined ($tempinfo->{'offset'}));
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393 |
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394 |
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395 | # note: we don't want to print the contents of the books
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396 | # Extra code for incremental building.
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397 | # We need to store a listing of the classifiers each DOI is in
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398 | my $clids = [];
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399 | #rint STDERR "==2. Recording reverse lookup for " . $tempinfo->{'OID'} . "==\n";
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400 | if(defined($oid_to_clids->{$tempinfo->{'OID'}})) {
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401 | #rint STDERR "Found existing array!\n";
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402 | $clids = $oid_to_clids->{$tempinfo->{'OID'}};
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403 | }
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404 | #rint STDERR "Appended $OID to \"" . join(";", @{$clids}) . "\"\n";
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405 | push(@{$clids}, $OID);
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406 | $oid_to_clids->{$tempinfo->{'OID'}} = $clids;
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407 | #rint STDERR "Result: \"" . join(";", @{$clids}) . "\"\n";
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408 |
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409 |
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410 | } else {
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411 |
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412 | # Supress having top-level node in Collage classifier
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413 | # so no bookshelf icon appears, top-level, along with the
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414 | # applet
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415 |
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416 | if (!defined ($tempinfo->{'Title'}) || $tempinfo->{'Title'} ne "Collage") {
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417 | $contains_text .= "\".$next_subOID";
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418 | }
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419 |
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420 | # Extra code for incremental building.
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421 | # We need to store a listing of the classifiers each DOI is in
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422 | my $clids = [];
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423 | #rint STDERR "==3. Recording reverse lookup for $OID.$next_subOID==\n";
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424 | if(defined($oid_to_clids->{$OID . "." . $next_subOID})) {
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425 | #rint STDERR "Found existing array!\n";
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426 | $clids = $oid_to_clids->{$OID . "." . $next_subOID};
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427 | }
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428 | #rint STDERR "Appended $OID to \"" . join(";", @{$clids}) . "\"\n";
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429 | push(@{$clids}, $OID);
|
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430 | $oid_to_clids->{$OID . "." . $next_subOID} = $clids;
|
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431 | #rint STDERR "Result: \"" . join(";", @{$clids}) . "\"\n";
|
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432 |
|
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433 | &print_classify_info ($handle, $tempinfo, "$OID.$next_subOID",
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434 | $remove_empty_classifications);
|
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435 | $next_subOID++;
|
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436 | }
|
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437 | }
|
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438 |
|
---|
439 | $outputtext .= "$contains_text\n";
|
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440 | $outputtext .= "<mdtype>$classifyinfo->{'mdtype'}\n"
|
---|
441 | if defined $classifyinfo->{'mdtype'};
|
---|
442 | $outputtext .= "$mdoffset_text\n"
|
---|
443 | if ($mdoffset_text !~ m/^<mdoffset>;+$/);
|
---|
444 |
|
---|
445 | $outputtext .= '-' x 70 . "\n";
|
---|
446 |
|
---|
447 | print $handle $outputtext;
|
---|
448 |
|
---|
449 | }
|
---|
450 |
|
---|
451 | sub check_contents {
|
---|
452 | my ($classifyinfo,$remove_empty_classifications) = @_;
|
---|
453 | $remove_empty_classifications = 0 unless ($remove_empty_classifications);
|
---|
454 | my $num_leaf_docs = 0;
|
---|
455 | my $sub_num_leaf_docs = 0;
|
---|
456 |
|
---|
457 | return $classifyinfo->{'numleafdocs'} if (defined $classifyinfo->{'numleafdocs'});
|
---|
458 |
|
---|
459 | foreach $content (@{$classifyinfo->{'contains'}}) {
|
---|
460 | if (defined $content->{'OID'}) {
|
---|
461 | # found a book
|
---|
462 | $num_leaf_docs ++;
|
---|
463 | } elsif (($sub_num_leaf_docs = &check_contents ($content,$remove_empty_classifications)) > 0) {
|
---|
464 | # there's a book somewhere below
|
---|
465 | $num_leaf_docs += $sub_num_leaf_docs;
|
---|
466 | } else {
|
---|
467 | if ($remove_empty_classifications){
|
---|
468 | # section contains no books so we want to remove
|
---|
469 | # it from its parents contents
|
---|
470 | $content = undef;
|
---|
471 | }
|
---|
472 | }
|
---|
473 | }
|
---|
474 |
|
---|
475 | $classifyinfo->{'numleafdocs'} = $num_leaf_docs;
|
---|
476 | return $num_leaf_docs;
|
---|
477 | }
|
---|
478 |
|
---|
479 | 1;
|
---|