1 | ###########################################################################
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2 | #
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3 | # Hierarchy.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 | # classifier plugin for generating hierarchical classifications
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27 |
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28 | # options for this classifier are:
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29 | # -hfile file.txt - classification file
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30 | # -metadata Metaname - metadata field to test against file.txt
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31 | # -sort Meta - this option is optional (genious;-). by default this
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32 | # classifier will sort documents within each section
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33 | # alphabetically by Title. sort=nosort prevents sorting
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34 | # (i.e. documents will end up in build order), sort=Meta
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35 | # will sort each field alphabetically by Meta (Meta may
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36 | # also be 'Filename' to sort by the original filename).
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37 | # -buttonname Title - another optional field. this is what will end up in the
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38 | # Title field for this classification. if not present it
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39 | # defaults to Metaname
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40 |
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41 | package Hierarchy;
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42 |
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43 | use BasClas;
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44 | use util;
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45 | use cfgread;
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46 | use sorttools;
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47 |
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48 | sub BEGIN {
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49 | @ISA = ('BasClas');
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50 | }
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51 |
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52 | sub print_usage {
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53 | print STDERR "
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54 | usage: classify Hierarchy [options]
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55 | options:
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56 |
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57 | -buttonname X Title field for this classification.
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58 | Defaults to metadata name.
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59 |
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60 | -metadata X Metadata field used for classification,
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61 | list will be sorted by this element.
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62 |
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63 | -hfile X The classification structure file
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64 |
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65 | -sort X Metadata field to sort by (defaults to none)
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66 | ";
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67 | }
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68 |
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69 |
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70 | sub new {
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71 | my $class = shift (@_);
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72 | my $self = new BasClas($class, @_);
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73 |
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74 | my $sortname = "Title";
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75 | my ($hfile, $metadata, $title);
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76 |
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77 | if (!parsargv::parse(\@_,
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78 | q^buttonname/.*/^, \$title,
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79 | q^sort/.*/nosort^, \$sortname,
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80 | q^hfile/.*/^, \$hfile,
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81 | q^metadata/.*/^, \$metadata,
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82 | "allow_extra_options")) {
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83 |
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84 | print STDERR "\nIncorrect options passed to $class, check your collect.cfg file\n";
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85 | &print_usage();
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86 | die "\n";
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87 | }
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88 |
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89 | if (!$metadata) {
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90 | &print_usage;
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91 | print STDERR "\nHierarchy error: no metadata supplied\n";
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92 | die "\n";
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93 | }
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94 |
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95 | $title = $metadata unless ($title);
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96 |
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97 | $sortname = undef if $sortname =~ /^nosort$/;
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98 |
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99 | if (!$hfile) {
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100 | &print_usage;
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101 | print STDERR "\nHierarchy error: No -hfile supplied\n";
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102 | die "\n";
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103 | }
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104 |
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105 | my $subjectfile = &util::filename_cat($ENV{'GSDLCOLLECTDIR'},"etc", $hfile);
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106 | if (!-e $subjectfile) {
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107 | my $collfile = $subjectfile;
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108 | $subjectfile = &util::filename_cat($ENV{'GSDLHOME'},"etc", $hfile);
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109 | if (!-e $subjectfile) {
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110 | my $outhandle = $self->{'outhandle'};
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111 | &print_usage;
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112 | print STDERR "\nHierarchy Error: Can't locate subject file $hfile\n";
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113 | print STDERR "This file should be in $collfile or $subjectfile\n";
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114 | die "\n";
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115 | }
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116 | }
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117 |
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118 | $self->{'descriptorlist'} = {}; # first field in subject file
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119 | $self->{'locatorlist'} = {}; # second field in subject file
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120 | $self->{'subjectfile'} = $subjectfile;
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121 | $self->{'metaname'} = $metadata;
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122 | $self->{'sortname'} = $sortname;
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123 | $self->{'title'} = $title;
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124 |
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125 | return bless $self, $class;
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126 | }
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127 |
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128 | sub init {
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129 | my $self = shift (@_);
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130 |
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131 | # read in the subject file
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132 | my $list = &cfgread::read_cfg_file ($self->{'subjectfile'}, undef, '^[^#]?\w');
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133 |
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134 | # $list is a hash that is indexed by the descriptor. The contents of this
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135 | # hash is a list of two items. The first item is the OID and the second item
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136 | # is the title
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137 | foreach $descriptor (keys (%$list)) {
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138 | $self->{'descriptorlist'}->{$descriptor} = $list->{$descriptor}->[0];
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139 | unless (defined $self->{'locatorlist'}->{$list->{$descriptor}->[0]}) {
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140 | $self->{'locatorlist'}->{$list->{$descriptor}->[0]}->{'title'} = $list->{$descriptor}->[1];
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141 | $self->{'locatorlist'}->{$list->{$descriptor}->[0]}->{'contents'} = [];
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142 | }
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143 | }
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144 | }
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145 |
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146 | sub classify {
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147 | my $self = shift (@_);
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148 | my ($doc_obj) = @_;
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149 |
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150 | my $doc_OID = $doc_obj->get_OID();
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151 |
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152 | my $metadata = $doc_obj->get_metadata ($doc_obj->get_top_section(),
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153 | $self->{'metaname'});
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154 |
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155 | my $sortmeta = "";
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156 | if (defined $self->{'sortname'}) {
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157 | if ($self->{'sortname'} =~ /^filename$/i) {
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158 | $sortmeta = $doc_obj->get_source_filename();
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159 | } else {
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160 | $sortmeta = $doc_obj->get_metadata_element($doc_obj->get_top_section(),
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161 | $self->{'sortname'});
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162 | if (defined $sortmeta) {
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163 | if ($self->{'sortname'} eq "Creator") {
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164 | &sorttools::format_string_name_english (\$sortmeta);
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165 | } else {
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166 | &sorttools::format_string_english (\$sortmeta);
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167 | }
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168 | }
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169 | }
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170 | $sortmeta = "" unless defined $sortmeta;
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171 | }
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172 |
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173 | foreach $metaelement (@$metadata) {
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174 | if ((defined $self->{'descriptorlist'}->{$metaelement}) &&
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175 | (defined $self->{'locatorlist'}->{$self->{'descriptorlist'}->{$metaelement}})) {
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176 | push (@{$self->{'locatorlist'}->{$self->{'descriptorlist'}->{$metaelement}}->{'contents'}},
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177 | [$doc_OID, $sortmeta]);
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178 | }
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179 | }
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180 | }
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181 |
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182 | sub get_classify_info {
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183 | my $self = shift (@_);
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184 |
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185 | my $list = $self->{'locatorlist'};
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186 |
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187 | my $classifyinfo = $self->get_entry ($self->{'title'}, "VList", "Invisible");
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188 | foreach $OID (keys (%$list)) {
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189 |
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190 | my $tempinfo = $self->get_OID_entry ($OID, $classifyinfo, $list->{$OID}->{'title'}, "VList");
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191 |
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192 | if (defined $self->{'sortname'}) {
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193 | foreach $subOID (sort {$a->[1] cmp $b->[1];} @{$list->{$OID}->{'contents'}}) {
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194 | push (@{$tempinfo->{'contains'}}, {'OID'=>$subOID->[0]});
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195 | }
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196 | } else {
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197 | foreach $subOID (@{$list->{$OID}->{'contents'}}) {
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198 | push (@{$tempinfo->{'contains'}}, {'OID'=>$subOID->[0]});
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199 | }
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200 | }
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201 | }
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202 |
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203 | return $classifyinfo;
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204 | }
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205 |
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206 | sub get_OID_entry {
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207 | my $self = shift (@_);
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208 | my ($OID, $classifyinfo, $title, $classifytype) = @_;
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209 |
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210 | $OID = "" unless defined $OID;
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211 | $OID =~ s/^\.+//;
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212 |
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213 | my ($headOID, $tailOID) = $OID =~ /^(\d+)(.*)$/;
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214 | $tailOID = "" unless defined $tailOID;
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215 |
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216 | if (!defined $headOID) {
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217 | $classifyinfo->{'Title'} = $title;
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218 | $classifyinfo->{'classifytype'} = $classifytype;
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219 | return $classifyinfo;
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220 | }
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221 |
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222 | $classifyinfo->{'contains'} = [] unless defined $classifyinfo->{'contains'};
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223 |
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224 | # add entries to the contains list until we have one for headOID
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225 | #### the +10 is a hack that works but I'm not completely sure why
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226 | #### and don't have time to delve deeper. one day someone should
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227 | #### fix this ;-) -- Stefan
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228 | while (scalar(@{$classifyinfo->{'contains'}}) <= ($headOID+10)) {
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229 | push (@{$classifyinfo->{'contains'}}, $self->get_entry("", $classifytype));
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230 | }
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231 |
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232 | return $self->get_OID_entry ($tailOID, $classifyinfo->{'contains'}->[($headOID-1)], $title, $classifytype);
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233 | }
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234 |
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235 | sub get_entry {
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236 | my $self = shift (@_);
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237 | my ($title, $childtype, $thistype) = @_;
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238 |
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239 | # organise into classification structure
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240 | my %classifyinfo = ('childtype'=>$childtype,
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241 | 'Title'=>$title,
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242 | 'contains'=>[]);
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243 | $classifyinfo{'thistype'} = $thistype
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244 | if defined $thistype && $thistype =~ /\w/;
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245 |
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246 | return \%classifyinfo;
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247 | }
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248 |
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249 |
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250 | 1;
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