| 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 |
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| 92 | use Encode;
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| 93 |
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| 94 | use BasePlugin;
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| 95 | use util;
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| 96 | use metadatautil;
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| 97 |
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| 98 | sub BEGIN {
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| 99 | @MetadataXMLPlugin::ISA = ('BasePlugin');
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| 100 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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| 101 | }
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| 102 |
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| 103 | use XMLParser;
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| 104 |
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| 105 | my $arguments = [
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| 106 | { 'name' => "process_exp",
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| 107 | 'desc' => "{BasePlugin.process_exp}",
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| 108 | 'type' => "regexp",
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| 109 | 'reqd' => "no",
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| 110 | 'deft' => &get_default_process_exp() }
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| 111 |
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| 112 | ];
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| 113 |
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| 114 | my $options = { 'name' => "MetadataXMLPlugin",
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| 115 | 'desc' => "{MetadataXMLPlugin.desc}",
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| 116 | 'abstract' => "no",
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| 117 | 'inherits' => "yes",
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| 118 | 'args' => $arguments };
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| 119 |
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| 120 | sub new {
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| 121 | my ($class) = shift (@_);
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| 122 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 123 | push(@$pluginlist, $class);
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| 124 |
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| 125 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 126 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 127 |
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| 128 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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| 129 |
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| 130 | if ($self->{'info_only'}) {
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| 131 | # don't worry about any options or initialisations etc
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| 132 | return bless $self, $class;
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| 133 | }
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| 134 |
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| 135 | # create XML::Parser object for parsing metadata.xml files
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| 136 | my $parser;
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| 137 | if ($]<5.008) {
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| 138 | # Perl 5.6
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| 139 | $parser = new XML::Parser('Style' => 'Stream',
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| 140 | 'PluginObj' => $self,
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| 141 | 'Handlers' => {'Char' => \&Char,
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| 142 | 'Doctype' => \&Doctype
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| 143 | });
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| 144 | }
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| 145 | else {
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| 146 | # Perl 5.8 or greater
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| 147 | $parser = new XML::Parser('Style' => 'Stream',
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| 148 | 'PluginObj' => $self,
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| 149 | 'ProtocolEncoding' => 'ISO-8859-1',
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| 150 | 'Handlers' => {'Char' => \&Char,
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| 151 | 'Doctype' => \&Doctype
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| 152 | });
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| 153 | }
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| 154 |
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| 155 | $self->{'parser'} = $parser;
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| 156 | $self->{'in_filename'} = 0;
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| 157 |
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| 158 |
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| 159 | return bless $self, $class;
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| 160 | }
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| 161 |
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| 162 |
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| 163 | sub get_default_process_exp
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| 164 | {
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| 165 | return q^metadata\.xml$^;
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| 166 | }
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| 167 |
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| 168 | sub get_doctype {
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| 169 | my $self = shift(@_);
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| 170 |
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| 171 | return "(Greenstone)?DirectoryMetadata"
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| 172 | }
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| 173 |
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| 174 | sub can_process_this_file {
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| 175 | my $self = shift(@_);
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| 176 | my ($filename) = @_;
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| 177 |
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| 178 | if (-f $filename && $self->SUPER::can_process_this_file($filename) && $self->check_doctype($filename)) {
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| 179 | return 1; # its a file for us
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| 180 | }
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| 181 | return 0;
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| 182 | }
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| 183 |
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| 184 | sub check_doctype {
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| 185 | my $self = shift (@_);
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| 186 |
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| 187 | my ($filename) = @_;
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| 188 |
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| 189 | if (open(XMLIN,"<$filename")) {
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| 190 | my $doctype = $self->get_doctype();
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| 191 | ## check whether the doctype has the same name as the root element tag
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| 192 | while (defined (my $line = <XMLIN>)) {
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| 193 | ## find the root element
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| 194 | if ($line =~ /<([\w\d:]+)[\s>]/){
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| 195 | my $root = $1;
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| 196 | if ($root !~ $doctype){
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| 197 | close(XMLIN);
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| 198 | return 0;
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| 199 | }
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| 200 | else {
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| 201 | close(XMLIN);
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| 202 | return 1;
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| 203 | }
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| 204 | }
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| 205 | }
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| 206 | close(XMLIN);
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| 207 | }
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| 208 |
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| 209 | return undef; # haven't found a valid line
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| 210 |
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| 211 | }
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| 212 |
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| 213 | sub file_block_read {
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| 214 | my $self = shift (@_);
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| 215 | my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $gli) = @_;
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| 216 |
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| 217 | my $filename_full_path = &util::filename_cat($base_dir, $file);
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| 218 | return undef unless $self->can_process_this_file($filename_full_path);
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| 219 |
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| 220 | $block_hash->{'metadata_files'}->{$filename_full_path} = 1;
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| 221 |
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| 222 | return 1;
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| 223 | }
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| 224 |
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| 225 | sub metadata_read
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| 226 | {
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| 227 | my $self = shift (@_);
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| 228 | my ($pluginfo, $base_dir, $file, $block_hash,
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| 229 | $extrametakeys, $extrametadata,$extrametafile,
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| 230 | $processor, $maxdocs, $gli) = @_;
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| 231 |
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| 232 | my $filename = &util::filename_cat($base_dir, $file);
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| 233 | return undef unless $self->can_process_this_file($filename);
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| 234 |
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| 235 | $self->{'metadata-file'} = $file;
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| 236 | $self->{'metadata-filename'} = $filename;
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| 237 |
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| 238 | my $outhandle = $self->{'outhandle'};
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| 239 |
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| 240 | print STDERR "\n<Processing n='$file' p='MetadataXMLPlugin'>\n" if ($gli);
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| 241 | print $outhandle "MetadataXMLPlugin: processing $file\n" if ($self->{'verbosity'})> 1;
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| 242 | # add the file to the block list so that it won't be processed in read, as we will do all we can with it here
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| 243 | $block_hash->{'file_blocks'}->{$filename} = 1;
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| 244 |
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| 245 | $self->{'metadataref'} = $extrametadata;
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| 246 | $self->{'metafileref'} = $extrametafile;
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| 247 | $self->{'metakeysref'} = $extrametakeys;
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| 248 |
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| 249 | eval {
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| 250 | $self->{'parser'}->parsefile($filename);
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| 251 | };
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| 252 |
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| 253 | if ($@) {
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| 254 | my $plugin_name = ref ($self);
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| 255 | my $failhandle = $self->{'failhandle'};
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| 256 | print $outhandle "$plugin_name failed to process $file ($@)\n";
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| 257 | print $failhandle "$plugin_name failed to process $file ($@)\n";
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| 258 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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| 259 | return -1; #error
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| 260 | }
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| 261 |
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| 262 | return 1;
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| 263 |
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| 264 | }
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| 265 |
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| 266 |
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| 267 | # Updated by Jeffrey 2010/04/16 @ DL Consulting Ltd.
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| 268 | # Get rid off the global $self as it cause problems when there are 2+ MetadataXMLPlugin in your collect.cfg...
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| 269 | # For example when you have an OAIMetadataXMLPlugin that is a child of MetadataXMLPlugin
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| 270 | sub Doctype {$_[0]->{'PluginObj'}->xml_doctype(@_);}
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| 271 | sub StartTag {$_[0]->{'PluginObj'}->xml_start_tag(@_);}
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| 272 | sub EndTag {$_[0]->{'PluginObj'}->xml_end_tag(@_);}
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| 273 | sub Text {$_[0]->{'PluginObj'}->xml_text(@_);}
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| 274 |
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| 275 |
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| 276 | sub xml_doctype {
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| 277 | my $self = shift(@_);
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| 278 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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| 279 |
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| 280 | # allow the short-lived and badly named "GreenstoneDirectoryMetadata" files
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| 281 | # to be processed as well as the "DirectoryMetadata" files which should now
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| 282 | # be created by import.pl
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| 283 | die if ($name !~ /^(Greenstone)?DirectoryMetadata$/);
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| 284 | }
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| 285 |
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| 286 | sub xml_start_tag {
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| 287 | my $self = shift(@_);
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| 288 | my ($expat, $element) = @_;
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| 289 |
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| 290 | if ($element eq "FileSet") {
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| 291 | $self->{'saved_targets'} = [];
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| 292 | $self->{'saved_metadata'} = {};
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| 293 | }
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| 294 | elsif ($element eq "FileName") {
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| 295 | $self->{'in_filename'} = 1;
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| 296 | }
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| 297 | elsif ($element eq "Metadata") {
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| 298 | $self->{'metadata_name'} = $_{'name'};
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| 299 | $self->{'metadata_value'} = "";
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| 300 | if ((defined $_{'mode'}) && ($_{'mode'} eq "accumulate")) {
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| 301 | $self->{'metadata_accumulate'} = 1;
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| 302 | } else {
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| 303 | $self->{'metadata_accumulate'} = 0;
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| 304 | }
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| 305 | }
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| 306 | }
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| 307 |
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| 308 | sub xml_end_tag {
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| 309 | my $self = shift(@_);
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| 310 | my ($expat, $element) = @_;
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| 311 |
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| 312 | if ($element eq "FileSet") {
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| 313 | foreach my $target (@{$self->{'saved_targets'}}) {
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| 314 | my $file_metadata = $self->{'metadataref'}->{$target};
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| 315 | my $saved_metadata = $self->{'saved_metadata'};
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| 316 |
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| 317 | if (!defined $file_metadata) {
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| 318 | $self->{'metadataref'}->{$target} = $saved_metadata;
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| 319 |
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| 320 | # not had target before
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| 321 | push (@{$self->{'metakeysref'}}, $target);
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| 322 | }
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| 323 | else {
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| 324 | &metadatautil::combine_metadata_structures($file_metadata,$saved_metadata);
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| 325 | }
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| 326 |
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| 327 |
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| 328 | # now record which metadata.xml file it came from
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| 329 |
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| 330 | my $file = $self->{'metadata-file'};
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| 331 | my $filename = $self->{'metadata-filename'};
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| 332 |
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| 333 | if (!defined $self->{'metafileref'}->{$target}) {
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| 334 | $self->{'metafileref'}->{$target} = {};
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| 335 | }
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| 336 |
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| 337 | $self->{'metafileref'}->{$target}->{$file} = $filename
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| 338 | }
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| 339 | }
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| 340 | elsif ($element eq "FileName") {
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| 341 | $self->{'in_filename'} = 0;
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| 342 | }
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| 343 | elsif ($element eq "Metadata") {
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| 344 | my $metadata_name = decode("utf8",$self->{'metadata_name'});
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| 345 | my $metadata_value = decode("utf8",$self->{'metadata_value'});
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| 346 |
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| 347 | &metadatautil::store_saved_metadata($self,
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| 348 | $metadata_name, $metadata_value,
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| 349 | $self->{'metadata_accumulate'});
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| 350 | $self->{'metadata_name'} = "";
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| 351 | }
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| 352 |
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| 353 | }
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| 354 |
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| 355 | sub xml_text {
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| 356 | my $self = shift(@_);
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| 357 |
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| 358 | if ($self->{'in_filename'}) {
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| 359 | # $_ == FileName content
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| 360 | push (@{$self->{'saved_targets'}}, $_);
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| 361 | }
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| 362 | elsif (defined ($self->{'metadata_name'}) && $self->{'metadata_name'} ne "") {
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| 363 | # $_ == Metadata content
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| 364 | $self->{'metadata_value'} = $_;
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| 365 | }
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| 366 | }
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| 367 |
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| 368 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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| 369 | # problem where $expat->{Text} is treated as the return value, slowing
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| 370 | # things down significantly in some cases.
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| 371 | sub Char {
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| 372 | if ($]<5.008) {
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| 373 | use bytes; # Necessary to prevent encoding issues with XML::Parser 2.31+ and Perl 5.6
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| 374 | }
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| 375 | $_[0]->{'Text'} .= $_[1];
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| 376 | return undef;
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| 377 | }
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| 378 |
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| 379 |
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| 380 |
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| 381 | 1;
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