1 | ###########################################################################
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2 | #
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3 | # MetadataXMLPlugin.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) 2006 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 | # MetadataXMLPlugin process metadata.xml files in a collection
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27 |
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28 | # Here's an example of a metadata file that uses three FileSet structures
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29 | # (ignore the # characters):
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30 |
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31 | #<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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32 | #<!DOCTYPE DirectoryMetadata SYSTEM "http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd">
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33 | #<DirectoryMetadata>
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34 | # <FileSet>
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35 | # <FileName>nugget.*</FileName>
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36 | # <Description>
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37 | # <Metadata name="Title">Nugget Point, The Catlins</Metadata>
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38 | # <Metadata name="Place" mode="accumulate">Nugget Point</Metadata>
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39 | # </Description>
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40 | # </FileSet>
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41 | # <FileSet>
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42 | # <FileName>nugget-point-1.jpg</FileName>
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43 | # <Description>
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44 | # <Metadata name="Title">Nugget Point Lighthouse, The Catlins</Metadata>
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45 | # <Metadata name="Subject">Lighthouse</Metadata>
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46 | # </Description>
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47 | # </FileSet>
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48 | # <FileSet>
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49 | # <FileName>kaka-point-dir</FileName>
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50 | # <Description>
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51 | # <Metadata name="Title">Kaka Point, The Catlins</Metadata>
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52 | # </Description>
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53 | # </FileSet>
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54 | #</DirectoryMetadata>
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55 |
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56 | # Metadata elements are read and applied to files in the order they appear
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57 | # in the file.
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58 | #
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59 | # The FileName element describes the subfiles in the directory that the
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60 | # metadata applies to as a perl regular expression (a FileSet group may
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61 | # contain multiple FileName elements). So, <FileName>nugget.*</FileName>
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62 | # indicates that the metadata records in the following Description block
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63 | # apply to every subfile that starts with "nugget". For these files, a
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64 | # Title metadata element is set, overriding any old value that the Title
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65 | # might have had.
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66 | #
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67 | # Occasionally, we want to have multiple metadata values applied to a
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68 | # document; in this case we use the "mode=accumulate" attribute of the
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69 | # particular Metadata element. In the second metadata element of the first
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70 | # FileSet above, the "Place" metadata is accumulating, and may therefore be
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71 | # given several values. If we wanted to override these values and use a
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72 | # single metadata element again, we could set the mode attribute to
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73 | # "override" instead. Remember: every element is assumed to be in override
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74 | # mode unless you specify otherwise, so if you want to accumulate metadata
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75 | # for some field, every occurance must have "mode=accumulate" specified.
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76 | #
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77 | # The second FileSet element above applies to a specific file, called
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78 | # nugget-point-1.jpg. This element overrides the Title metadata set in the
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79 | # first FileSet, and adds a "Subject" metadata field.
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80 | #
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81 | # The third and final FileSet sets metadata for a subdirectory rather than
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82 | # a file. The metadata specified (a Title) will be passed into the
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83 | # subdirectory and applied to every file that occurs in the subdirectory
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84 | # (and to every subsubdirectory and its contents, and so on) unless the
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85 | # metadata is explictly overridden later in the import.
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86 |
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87 | package MetadataXMLPlugin;
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88 |
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89 | use strict;
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90 | no strict 'refs';
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91 | use BasePlugin;
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92 | use util;
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93 | use metadatautil;
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94 |
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95 | sub BEGIN {
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96 | @MetadataXMLPlugin::ISA = ('BasePlugin');
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97 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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98 | }
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99 |
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100 | use XMLParser;
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101 |
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102 | my $arguments = [
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103 | { 'name' => "block_exp",
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104 | 'desc' => "{BasePlugin.block_exp}",
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105 | 'type' => "regexp",
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106 | 'reqd' => "no",
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107 | 'deft' => &get_default_block_exp() }
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108 | ];
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109 |
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110 | my $options = { 'name' => "MetadataXMLPlugin",
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111 | 'desc' => "{MetadataXMLPlugin.desc}",
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112 | 'abstract' => "no",
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113 | 'inherits' => "yes",
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114 | 'args' => $arguments };
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115 |
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116 | my ($self);
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117 |
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118 | sub new {
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119 | my ($class) = shift (@_);
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120 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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121 | push(@$pluginlist, $class);
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122 |
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123 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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124 | push(@{$hashArgOptLists->{"OptList"}},$options);
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125 |
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126 | $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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127 |
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128 | if ($self->{'info_only'}) {
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129 | # don't worry about any options or initialisations etc
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130 | return bless $self, $class;
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131 | }
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132 |
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133 | # create XML::Parser object for parsing metadata.xml files
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134 | my $parser;
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135 | if ($]<5.008) {
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136 | # Perl 5.6
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137 | $parser = new XML::Parser('Style' => 'Stream',
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138 | 'Handlers' => {'Char' => \&Char,
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139 | 'Doctype' => \&Doctype
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140 | });
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141 | }
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142 | else {
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143 | # Perl 5.8
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144 | $parser = new XML::Parser('Style' => 'Stream',
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145 | 'ProtocolEncoding' => 'ISO-8859-1',
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146 | 'Handlers' => {'Char' => \&Char,
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147 | 'Doctype' => \&Doctype
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148 | });
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149 | }
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150 |
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151 | $self->{'parser'} = $parser;
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152 | $self->{'in_filename'} = 0;
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153 |
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154 |
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155 | return bless $self, $class;
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156 | }
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157 |
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158 |
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159 | sub get_default_process_exp
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160 | {
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161 | return q^metadata\.xml$^;
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162 | }
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163 |
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164 | # We don't want any other plugins to see metadata.xml files
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165 | # block exp are currently only used in the read bit
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166 | sub get_default_block_exp
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167 | {
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168 | return q^metadata\.xml$^;
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169 | }
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170 |
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171 | sub metadata_read
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172 | {
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173 | my $self = shift (@_);
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174 | my ($pluginfo, $base_dir, $file, $metadata, $extrametakeys, $extrametadata,
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175 | $processor, $maxdocs, $gli) = @_;
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176 |
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177 | my $filename = &util::filename_cat($base_dir, $file);
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178 | if ($filename !~ /metadata\.xml$/ || !-f $filename) {
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179 | return undef;
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180 | }
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181 |
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182 | print STDERR "\n<Processing n='$file' p='MetadataXMLPlugin'>\n" if ($gli);
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183 | print STDERR "MetadataXMLPlugin: processing $file\n" if ($self->{'verbosity'})> 1;
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184 |
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185 | $self->{'metadataref'} = $extrametadata;
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186 | $self->{'metakeysref'} = $extrametakeys;
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187 |
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188 | eval {
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189 | $self->{'parser'}->parsefile($filename);
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190 | };
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191 |
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192 | if ($@) {
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193 | my $outhandle = $self->{'outhandle'};
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194 | my $plugin_name = ref ($self);
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195 | print $outhandle "$plugin_name failed to process $file ($@)\n";
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196 |
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197 | return -1; #error
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198 | }
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199 | return 1;
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200 |
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201 | }
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202 |
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203 | sub Doctype {
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204 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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205 |
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206 | # allow the short-lived and badly named "GreenstoneDirectoryMetadata" files
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207 | # to be processed as well as the "DirectoryMetadata" files which should now
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208 | # be created by import.pl
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209 | die if ($name !~ /^(Greenstone)?DirectoryMetadata$/);
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210 | }
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211 |
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212 | sub StartTag {
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213 | my ($expat, $element) = @_;
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214 |
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215 | if ($element eq "FileSet") {
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216 | $self->{'saved_targets'} = [];
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217 | $self->{'saved_metadata'} = {};
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218 | }
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219 | elsif ($element eq "FileName") {
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220 | $self->{'in_filename'} = 1;
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221 | }
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222 | elsif ($element eq "Metadata") {
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223 | $self->{'metadata_name'} = $_{'name'};
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224 | $self->{'metadata_value'} = "";
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225 | if ((defined $_{'mode'}) && ($_{'mode'} eq "accumulate")) {
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226 | $self->{'metadata_accumulate'} = 1;
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227 | } else {
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228 | $self->{'metadata_accumulate'} = 0;
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229 | }
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230 | }
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231 | }
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232 |
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233 | sub EndTag {
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234 | my ($expat, $element) = @_;
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235 |
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236 | if ($element eq "FileSet") {
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237 | foreach my $target (@{$self->{'saved_targets'}}) {
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238 | my $file_metadata = $self->{'metadataref'}->{$target};
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239 | my $saved_metadata = $self->{'saved_metadata'};
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240 | if (!defined $file_metadata) {
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241 | $self->{'metadataref'}->{$target} = $saved_metadata;
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242 |
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243 | # not had target before
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244 | push (@{$self->{'metakeysref'}}, $target);
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245 | }
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246 | else {
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247 | &metadatautil::combine_metadata_structures($file_metadata,$saved_metadata);
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248 | }
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249 | }
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250 | }
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251 | elsif ($element eq "FileName") {
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252 | $self->{'in_filename'} = 0;
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253 | }
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254 | elsif ($element eq "Metadata") {
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255 | &metadatautil::store_saved_metadata($self,$self->{'metadata_name'}, $self->{'metadata_value'}, $self->{'metadata_accumulate'});
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256 | $self->{'metadata_name'} = "";
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257 | }
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258 |
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259 | }
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260 |
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261 | sub Text {
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262 |
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263 | if ($self->{'in_filename'}) {
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264 | # $_ == FileName content
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265 | push (@{$self->{'saved_targets'}}, $_);
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266 | }
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267 | elsif (defined ($self->{'metadata_name'}) && $self->{'metadata_name'} ne "") {
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268 | # $_ == Metadata content
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269 | $self->{'metadata_value'} = $_;
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270 | }
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271 | }
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272 |
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273 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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274 | # problem where $expat->{Text} is treated as the return value, slowing
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275 | # things down significantly in some cases.
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276 | sub Char {
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277 | if ($]<5.008) {
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278 | use bytes; # Necessary to prevent encoding issues with XML::Parser 2.31+ and Perl 5.6
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279 | }
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280 | $_[0]->{'Text'} .= $_[1];
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281 | return undef;
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282 | }
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283 |
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284 | #sub combine_metadata_structures
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285 | #{
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286 | # my $self = shift(@_);
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287 | #
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288 | # my ($mdref1, $mdref2) = @_;
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289 | # &metadatautil::combine_metadata_structures($mdref1, $mdref2);
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290 | #}
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291 |
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292 |
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293 | 1;
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