| 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 | use FileUtils;
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| 32 | require AllList;
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| 33 |
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| 34 | use dbutil;
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| 35 | use gsprintf;
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| 36 | use strict; no strict 'subs';
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| 37 |
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| 38 |
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| 39 | sub gsprintf
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| 40 | {
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| 41 | return &gsprintf::gsprintf(@_);
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| 42 | }
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| 43 |
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| 44 |
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| 45 | sub load_classifier_for_info {
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| 46 | my ($classifier) = shift @_;
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| 47 |
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| 48 | # find the classifier
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| 49 | # - used to have hardcoded list of places to load classifier from. We
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| 50 | # should, instead, try loading from all of the perllib places on the
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| 51 | # library path, as that improves support for extensions. Special cases
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| 52 | # needed for collection specific and custom classifier. [jmt12]
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| 53 | my @possible_class_paths;
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| 54 | if (defined($ENV{'GSDLCOLLECTION'}))
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| 55 | {
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| 56 | push(@possible_class_paths, &FileUtils::filenameConcatenate($ENV{'GSDLCOLLECTDIR'}, 'custom', $ENV{'GSDLCOLLECTION'}, 'perllib', 'classify', $classifier . '.pm'));
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| 57 | }
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| 58 | # (why does GSDLCOLLECTDIR get set to GSDLHOME for classinfo calls?)
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| 59 | if ($ENV{'GSDLCOLLECTDIR'} ne $ENV{'GSDLHOME'})
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| 60 | {
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| 61 | push(@possible_class_paths, &FileUtils::filenameConcatenate($ENV{'GSDLCOLLECTDIR'}, 'perllib', 'classify', $classifier . '.pm'));
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| 62 | }
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| 63 | foreach my $library_path (@INC)
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| 64 | {
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| 65 | # only interested in classify paths found in the library paths
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| 66 | if ($library_path =~ /classify$/)
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| 67 | {
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| 68 | push(@possible_class_paths, &FileUtils::filenameConcatenate($library_path, $classifier . '.pm'));
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| 69 | }
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| 70 | }
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| 71 | my $found_class = 0;
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| 72 | foreach my $possible_class_path (@possible_class_paths)
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| 73 | {
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| 74 | if (-e $possible_class_path)
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| 75 | {
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| 76 | require $possible_class_path;
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| 77 | $found_class = 1;
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| 78 | last;
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| 79 | }
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| 80 | }
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| 81 | if (!$found_class)
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| 82 | {
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| 83 | &gsprintf(STDERR, "{classify.could_not_find_classifier}\n", $classifier) && die "\n";
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| 84 | }
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| 85 |
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| 86 | my ($classobj);
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| 87 | my $options = "-gsdlinfo";
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| 88 | eval ("\$classobj = new \$classifier([],[$options])");
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| 89 | die "$@" if $@;
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| 90 |
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| 91 | return $classobj;
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| 92 | }
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| 93 |
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| 94 | sub load_classifiers {
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| 95 | my ($classify_list, $build_dir, $outhandle) = @_;
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| 96 | my @classify_objects = ();
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| 97 | my $classify_number = 1;
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| 98 |
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| 99 | # - ensure colclassdir doesn't already exist in INC before adding, other-
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| 100 | # wise we risk clobbering classifier inheritence implied by order of paths
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| 101 | # in INC [jmt12]
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| 102 | my $colclassdir = &FileUtils::filenameConcatenate($ENV{'GSDLCOLLECTDIR'},"perllib/classify");
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| 103 | &util::augmentINC($colclassdir);
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| 104 |
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| 105 | foreach my $classifyoption (@$classify_list) {
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| 106 |
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| 107 | # get the classifier name
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| 108 | my $classname = shift @$classifyoption;
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| 109 | next unless defined $classname;
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| 110 |
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| 111 | # find the classifier
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| 112 | # - replaced as explained in load_classifier_for_info() [jmt12]
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| 113 | my @possible_class_paths;
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| 114 | if (defined($ENV{'GSDLCOLLECTION'}))
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| 115 | {
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| 116 | push(@possible_class_paths, &FileUtils::filenameConcatenate($ENV{'GSDLCOLLECTDIR'}, 'custom', $ENV{'GSDLCOLLECTION'}, 'perllib', 'classify', $classname . '.pm'));
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| 117 | }
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| 118 | # (why does GSDLCOLLECTDIR get set to GSDLHOME for classinfo calls?)
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| 119 | if ($ENV{'GSDLCOLLECTDIR'} ne $ENV{'GSDLHOME'})
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| 120 | {
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| 121 | push(@possible_class_paths,&FileUtils::filenameConcatenate($ENV{'GSDLCOLLECTDIR'}, 'perllib', 'classify', $classname . '.pm'));
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| 122 | }
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| 123 | foreach my $library_path (@INC)
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| 124 | {
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| 125 | # only interested in classify paths found in the library paths
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| 126 | if ($library_path =~ /classify$/)
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| 127 | {
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| 128 | push(@possible_class_paths, &FileUtils::filenameConcatenate($library_path, $classname . '.pm'));
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| 129 | }
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| 130 | }
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| 131 | my $found_class = 0;
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| 132 | foreach my $possible_class_path (@possible_class_paths)
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| 133 | {
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| 134 | if (-e $possible_class_path)
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| 135 | {
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| 136 | require $possible_class_path;
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| 137 | $found_class = 1;
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| 138 | last;
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| 139 | }
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| 140 | }
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| 141 | if (!$found_class)
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| 142 | {
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| 143 | &gsprintf(STDERR, "{classify.could_not_find_classifier}\n", $classname) && die "\n";
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| 144 | }
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| 145 |
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| 146 | # create the classify object
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| 147 | my ($classobj);
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| 148 |
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| 149 | my @newoptions;
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| 150 |
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| 151 | # do these first so they can be overriden by user supplied options
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| 152 | if ($build_dir) {
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| 153 | (my $build_dir_re = $build_dir) =~ s@\\@\\\\@g; # copy build_dir into build_dir_re and modify build_dir_re
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| 154 | push @newoptions, "-builddir", "$build_dir_re";
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| 155 | }
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| 156 | push @newoptions, "-outhandle", "$outhandle" if ($outhandle);
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| 157 | push @newoptions, "-verbosity", "2";
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| 158 |
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| 159 | # backwards compatability hack: if the classifier options are
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| 160 | # in "x=y" format, convert them to parsearg ("-x y") format.
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| 161 | my ($opt, $key, $value);
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| 162 | foreach $opt (@$classifyoption) {
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| 163 | # if ($opt =~ /^(\w+)=(.*)$/) {
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| 164 | # push @newoptions, "-$1", $2;
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| 165 | # } else {
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| 166 | push @newoptions, $opt;
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| 167 | #}
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| 168 | }
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| 169 |
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| 170 | eval ("\$classobj = new \$classname([],[\@newoptions])");
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| 171 | die "$@" if $@;
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| 172 |
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| 173 | $classobj->set_number($classify_number);
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| 174 | $classify_number ++;
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| 175 |
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| 176 | # add this object to the list
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| 177 | push (@classify_objects, $classobj);
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| 178 | }
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| 179 |
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| 180 | return \@classify_objects;
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| 181 | }
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| 182 |
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| 183 | # init_classifiers resets all the classifiers and readys them to process
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| 184 | # the documents.
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| 185 | sub init_classifiers {
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| 186 | my ($classifiers) = @_;
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| 187 |
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| 188 | foreach my $classobj (@$classifiers) {
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| 189 | $classobj->init();
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| 190 | }
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| 191 | }
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| 192 |
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| 193 |
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| 194 |
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| 195 | # takes a hashref containing the metadata for an infodb entry, and extracts
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| 196 | # the childrens numbers (from the 'contains' entry).
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| 197 | # assumes format is ".1;".2;".3
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| 198 | sub get_children {
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| 199 | my ($doc_db_hash) = @_;
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| 200 |
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| 201 | my $children = undef;
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| 202 |
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| 203 | my $contains = $doc_db_hash->{'contains'};
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| 204 | if (defined ($contains)) {
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| 205 | $contains =~ s/\@$//; #remove trailing @
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| 206 | $contains =~ s/^\"\.//; #remove initial ".
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| 207 | @$children = split /\;\"\./, $contains;
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| 208 | }
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| 209 |
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| 210 | return $children;
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| 211 | }
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| 212 |
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| 213 |
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| 214 | sub recurse_sections {
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| 215 | my ($doc_obj, $children, $parentoid, $parentsection, $database_recs) = @_;
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| 216 |
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| 217 | return if (!defined $children);
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| 218 |
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| 219 | foreach my $child (sort { $a <=> $b} @$children) {
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| 220 | $doc_obj->create_named_section("$parentsection.$child");
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| 221 | my $doc_db_rec = $database_recs->{"$parentoid.$child"};
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| 222 | my $doc_db_hash = db_rec_to_hash($doc_db_rec);
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| 223 |
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| 224 | # get child's children
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| 225 | my $newchildren = &get_children($doc_db_hash);
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| 226 |
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| 227 | # add content for current section
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| 228 | add_section_content($doc_obj, "$parentsection.$child", $doc_db_hash);
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| 229 |
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| 230 | # process all the children if there are any
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| 231 | if (defined ($newchildren))
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| 232 | {
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| 233 | recurse_sections($doc_obj, $newchildren, "$parentoid.$child",
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| 234 | "$parentsection.$child", $database_recs);
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| 235 | }
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| 236 | }
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| 237 | }
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| 238 |
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| 239 |
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| 240 | sub add_section_content {
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| 241 | my ($doc_obj, $cursection, $doc_db_hash) = @_;
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| 242 |
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| 243 | foreach my $key (keys %$doc_db_hash) {
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| 244 | #don't need to store these metadata
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| 245 | next if $key =~ /(thistype|childtype|contains|docnum|doctype|classifytype)/i;
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| 246 | # but do want things like hastxt and archivedir
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| 247 | my @items = split /@/, $doc_db_hash->{$key};
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| 248 | # metadata is all from the info database so should already be in utf8
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| 249 | map {$doc_obj->add_utf8_metadata ($cursection, $key, $_); } @items;
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| 250 |
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| 251 | }
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| 252 | }
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| 253 |
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| 254 |
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| 255 | # gets all the metadata from an infodb entry, and puts it into a hashref
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| 256 | sub db_rec_to_hash {
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| 257 |
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| 258 | my ($infodb_str_ref) = @_;
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| 259 |
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| 260 | my $hashref = {};
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| 261 |
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| 262 | my @entries = split(/\n/, $infodb_str_ref);
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| 263 | foreach my $entry (@entries) {
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| 264 | my($key, $value) = ($entry =~ /^<([^>]*)>(.*?)$/ );
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| 265 | $hashref->{$key} .= '@' if defined $hashref->{$key};
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| 266 | $hashref->{$key} .= $value;
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| 267 |
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| 268 | }
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| 269 |
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| 270 | return $hashref;
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| 271 | }
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| 272 |
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| 273 |
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| 274 | sub reconstruct_doc_objs_metadata
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| 275 | {
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| 276 | my $infodb_type = shift(@_);
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| 277 | my $infodb_file_path = shift(@_);
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| 278 | my $database_recs = shift(@_);
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| 279 |
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| 280 | # dig out top level doc sections
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| 281 | my %top_sections = ();
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| 282 | my %top_docnums = ();
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| 283 | foreach my $key ( keys %$database_recs )
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| 284 | {
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| 285 | my $md_rec = $database_recs->{$key};
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| 286 | my $md_hash = db_rec_to_hash($md_rec);
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| 287 |
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| 288 | if ((defined $md_hash->{'doctype'}) && ($md_hash->{'doctype'} eq "doc")) {
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| 289 | next if ($key =~ m/\./);
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| 290 | $top_sections{$key} = $md_hash;
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| 291 | $top_docnums{$key} = $md_hash->{'docnum'};
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| 292 | }
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| 293 | }
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| 294 |
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| 295 | # for greenstone document objects based on metadata in database file
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| 296 | my @all_docs = ();
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| 297 | # we need to make sure the documents were processed in the same order as
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| 298 | # before, so sort based on their docnums
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| 299 | foreach my $oid ( sort { $top_docnums{$a} <=> $top_docnums{$b} } keys %top_sections )
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| 300 | {
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| 301 | my $doc_db_hash = $top_sections{$oid};
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| 302 |
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| 303 | my $doc_obj = new doc();
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| 304 | $doc_obj->set_OID($oid);
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| 305 | my $top = $doc_obj->get_top_section();
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| 306 | add_section_content ($doc_obj, $top, $doc_db_hash);
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| 307 | my $children = &get_children($doc_db_hash);
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| 308 | recurse_sections($doc_obj, $children, $oid, $top, $database_recs);
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| 309 |
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| 310 | push(@all_docs,$doc_obj);
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| 311 | }
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| 312 |
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| 313 | return \@all_docs;
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| 314 | }
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| 315 |
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| 316 |
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| 317 |
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| 318 |
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| 319 |
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| 320 | # classify_doc lets each of the classifiers classify a document
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| 321 | sub classify_doc {
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| 322 | my ($classifiers, $doc_obj) = @_;
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| 323 |
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| 324 | foreach my $classobj (@$classifiers) {
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| 325 | my $title = $classobj->{'title'};
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| 326 |
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| 327 | $classobj->classify($doc_obj);
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| 328 | }
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| 329 | }
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| 330 |
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| 331 |
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| 332 | our $next_classify_num = 1;
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| 333 |
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| 334 | # output_classify_info outputs all the info needed for the classification
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| 335 | # to the database
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| 336 | sub output_classify_info
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| 337 | {
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| 338 | my ($classifiers, $infodb_type, $infodb_handle, $remove_empty_classifications, $gli) = @_;
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| 339 |
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| 340 | $gli = 0 unless defined $gli;
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| 341 |
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| 342 | # create a classification containing all the info
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| 343 | my $classifyinfo = { 'classifyOID'=> 'browse',
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| 344 | 'contains' => [] };
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| 345 |
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| 346 | # get each of the classifications
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| 347 | foreach my $classifier (@$classifiers)
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| 348 | {
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| 349 | my $classifier_info = $classifier->get_classify_info($gli);
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| 350 | if (defined $classifier_info) {
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| 351 | $classifier_info->{'classifyOID'} = "CL$next_classify_num" unless defined($classifier_info->{'classifyOID'});
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| 352 | print STDERR "*** outputting information for classifier: $classifier_info->{'classifyOID'}\n";
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| 353 |
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| 354 | push(@{$classifyinfo->{'contains'}}, $classifier_info);
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| 355 | } else {
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| 356 | print STDERR "*** error with classifier CL$next_classify_num, not outputing it\n";
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| 357 | }
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| 358 | $next_classify_num++;
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| 359 |
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| 360 | }
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| 361 |
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| 362 | &print_classify_info($infodb_type, $infodb_handle, $classifyinfo, "", $remove_empty_classifications);
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| 363 | }
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| 364 |
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| 365 |
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| 366 | sub print_classify_info
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| 367 | {
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| 368 | my ($infodb_type, $infodb_handle, $classifyinfo, $OID, $remove_empty_classifications) = @_;
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| 369 |
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| 370 | $OID =~ s/^\.+//; # just for good luck
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| 371 |
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| 372 | # book information is printed elsewhere
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| 373 | return if (defined ($classifyinfo->{'OID'}));
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| 374 |
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| 375 | # don't want empty classifications
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| 376 | return if (&check_contents ($classifyinfo, $remove_empty_classifications) == 0 && $remove_empty_classifications);
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| 377 |
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| 378 | $OID = $classifyinfo->{'classifyOID'} if defined ($classifyinfo->{'classifyOID'});
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| 379 |
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| 380 | my %classify_infodb = ();
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| 381 | $classify_infodb{"doctype"} = [ "classify" ];
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| 382 | $classify_infodb{"hastxt"} = [ "0" ];
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| 383 | $classify_infodb{"childtype"} = [ $classifyinfo->{'childtype'} ]
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| 384 | if defined $classifyinfo->{'childtype'};
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| 385 | $classify_infodb{"Title"} = [ $classifyinfo->{'Title'} ]
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| 386 | if defined $classifyinfo->{'Title'};
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| 387 | $classify_infodb{"numleafdocs"} = [ $classifyinfo->{'numleafdocs'} ]
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| 388 | if defined $classifyinfo->{'numleafdocs'};
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| 389 | $classify_infodb{"thistype"} = [ $classifyinfo->{'thistype'} ]
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| 390 | if defined $classifyinfo->{'thistype'};
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| 391 | $classify_infodb{"parameters"} = [ $classifyinfo->{'parameters'} ]
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| 392 | if defined $classifyinfo->{'parameters'};
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| 393 | $classify_infodb{"supportsmemberof"} = [ $classifyinfo->{'supportsmemberof'} ]
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| 394 | if defined $classifyinfo->{'supportsmemberof'};
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| 395 |
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| 396 | my $contains_text = "";
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| 397 | my $mdoffset_text = "";
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| 398 |
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| 399 | my $next_subOID = 1;
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| 400 | my $first = 1;
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| 401 | foreach my $tempinfo (@{$classifyinfo->{'contains'}}) {
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| 402 | # empty contents were made undefined by clean_contents()
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| 403 | next unless defined $tempinfo;
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| 404 | if (!defined ($tempinfo->{'classifyOID'}) ||
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| 405 | $tempinfo->{'classifyOID'} ne "oai") {
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| 406 | $contains_text .= ";" unless $first;
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| 407 | }
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| 408 | $mdoffset_text .= ";" unless $first;
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| 409 | $first = 0;
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| 410 |
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| 411 | if (defined ($tempinfo->{'classifyOID'}))
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| 412 | {
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| 413 | if ($tempinfo->{'classifyOID'} ne "oai")
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| 414 | {
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| 415 | $contains_text .= $tempinfo->{'classifyOID'};
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| 416 | }
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| 417 |
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| 418 | &print_classify_info ($infodb_type, $infodb_handle, $tempinfo, $tempinfo->{'classifyOID'},
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| 419 | $remove_empty_classifications);
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| 420 | }
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| 421 | elsif (defined ($tempinfo->{'OID'}))
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| 422 | {
|
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| 423 | $contains_text .= $tempinfo->{'OID'};
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| 424 | $mdoffset_text .= $tempinfo->{'offset'} if (defined ($tempinfo->{'offset'}));
|
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| 425 | }
|
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| 426 | else
|
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| 427 | {
|
|---|
| 428 | # Supress having top-level node in Collage classifier
|
|---|
| 429 | # so no bookshelf icon appears, top-level, along with the
|
|---|
| 430 | # applet
|
|---|
| 431 | if (!defined ($tempinfo->{'Title'}) || $tempinfo->{'Title'} ne "Collage")
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|---|
| 432 | {
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|---|
| 433 | $contains_text .= "\".$next_subOID";
|
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| 434 | }
|
|---|
| 435 |
|
|---|
| 436 | &print_classify_info ($infodb_type, $infodb_handle, $tempinfo, "$OID.$next_subOID",
|
|---|
| 437 | $remove_empty_classifications);
|
|---|
| 438 | $next_subOID++;
|
|---|
| 439 | }
|
|---|
| 440 | }
|
|---|
| 441 |
|
|---|
| 442 | $classify_infodb{"contains"} = [ $contains_text ];
|
|---|
| 443 | $classify_infodb{"mdtype"} = [ $classifyinfo->{'mdtype'} ]
|
|---|
| 444 | if defined $classifyinfo->{'mdtype'};
|
|---|
| 445 | $classify_infodb{"mdoffset"} = [ $mdoffset_text ]
|
|---|
| 446 | if ($mdoffset_text !~ m/^;+$/);
|
|---|
| 447 |
|
|---|
| 448 | &dbutil::write_infodb_entry($infodb_type, $infodb_handle, $OID, \%classify_infodb);
|
|---|
| 449 | }
|
|---|
| 450 |
|
|---|
| 451 |
|
|---|
| 452 | sub check_contents {
|
|---|
| 453 | my ($classifyinfo,$remove_empty_classifications) = @_;
|
|---|
| 454 | $remove_empty_classifications = 0 unless ($remove_empty_classifications);
|
|---|
| 455 | my $num_leaf_docs = 0;
|
|---|
| 456 | my $sub_num_leaf_docs = 0;
|
|---|
| 457 |
|
|---|
| 458 | return $classifyinfo->{'numleafdocs'} if (defined $classifyinfo->{'numleafdocs'});
|
|---|
| 459 |
|
|---|
| 460 | foreach my $content (@{$classifyinfo->{'contains'}}) {
|
|---|
| 461 | if (defined $content->{'OID'}) {
|
|---|
| 462 | # found a book
|
|---|
| 463 | $num_leaf_docs ++;
|
|---|
| 464 | } elsif (($sub_num_leaf_docs = &check_contents ($content,$remove_empty_classifications)) > 0) {
|
|---|
| 465 | # there's a book somewhere below
|
|---|
| 466 | $num_leaf_docs += $sub_num_leaf_docs;
|
|---|
| 467 | } else {
|
|---|
| 468 | if ($remove_empty_classifications){
|
|---|
| 469 | # section contains no books so we want to remove
|
|---|
| 470 | # it from its parents contents
|
|---|
| 471 | $content = undef;
|
|---|
| 472 | }
|
|---|
| 473 | }
|
|---|
| 474 | }
|
|---|
| 475 |
|
|---|
| 476 | $classifyinfo->{'numleafdocs'} = $num_leaf_docs;
|
|---|
| 477 | return $num_leaf_docs;
|
|---|
| 478 | }
|
|---|
| 479 |
|
|---|
| 480 | 1;
|
|---|
