| 1 | ###########################################################################
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| 2 | #
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| 3 | # OAIPlug.pm -- basic Open Archives Initiative (OAI) plugin
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| 4 | #
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| 5 | # A component of the Greenstone digital library software
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| 6 | # from the New Zealand Digital Library Project at the
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| 7 | # University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful,
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| 17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | # GNU General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 | package OAIPlugin;
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| 28 |
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| 29 | # Devel::Peek's Dump($var) function is useful for debugging encoding issues.
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| 30 | #use Devel::Peek;
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| 31 | use Encode;
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| 32 | use extrametautil;
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| 33 | use unicode;
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| 34 | use util;
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| 35 |
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| 36 | use strict;
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| 37 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 38 |
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| 39 | use ReadXMLFile;
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| 40 | use ReadTextFile; # needed for subroutine textcat_get_language_encoding
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| 41 | use metadatautil;
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| 42 | use MetadataRead;
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| 43 | use util;
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| 44 |
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| 45 | # methods with identical signatures take precedence in the order given in the ISA list.
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| 46 | sub BEGIN {
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| 47 | @OAIPlugin::ISA = ('MetadataRead', 'ReadXMLFile', 'ReadTextFile');
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| 48 | }
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| 49 |
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| 50 | my $set_list =
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| 51 | [ { 'name' => "auto",
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| 52 | 'desc' => "{OAIPlugin.metadata_set.auto}" },
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| 53 | { 'name' => "dc",
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| 54 | 'desc' => "{OAIPlugin.metadata_set.dc}" }
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| 55 | ];
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| 56 |
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| 57 | my $arguments =
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| 58 | [ { 'name' => "process_exp",
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| 59 | 'desc' => "{BasePlugin.process_exp}",
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| 60 | 'type' => "regexp",
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| 61 | 'reqd' => "no",
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| 62 | 'deft' => &get_default_process_exp() },
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| 63 | { 'name' => "metadata_set",
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| 64 | 'desc' => "{OAIPlugin.metadata_set}",
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| 65 | 'type' => "enumstring",
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| 66 | 'reqd' => "no",
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| 67 | 'list' => $set_list,
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| 68 | 'deft' => "dc" },
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| 69 | { 'name' => "document_field",
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| 70 | 'desc' => "{OAIPlugin.document_field}",
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| 71 | 'type' => "metadata",
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| 72 | 'reqd' => "no",
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| 73 | 'deft' => "gi.Sourcedoc" }
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| 74 | ];
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| 75 |
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| 76 | my $options = { 'name' => "OAIPlugin",
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| 77 | 'desc' => "{OAIPlugin.desc}",
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| 78 | 'abstract' => "no",
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| 79 | 'inherits' => "yes",
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| 80 | 'explodes' => "yes",
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| 81 | 'args' => $arguments };
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| 82 |
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| 83 |
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| 84 | sub new {
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| 85 | my ($class) = shift (@_);
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| 86 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 87 | push(@$pluginlist, $class);
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| 88 |
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| 89 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 90 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 91 |
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| 92 | new ReadTextFile($pluginlist, $inputargs, $hashArgOptLists,1);
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| 93 | my $self = new ReadXMLFile($pluginlist, $inputargs, $hashArgOptLists);
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| 94 |
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| 95 | if ($self->{'info_only'}) {
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| 96 | # don't worry about modifying options
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| 97 | return bless $self, $class;
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| 98 | }
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| 99 | # trim any ex. from document field iff it's the only metadata namespace prefix
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| 100 | $self->{'document_field'} =~ s/^ex\.([^.]+)$/$1/;
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| 101 | return bless $self, $class;
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| 102 | }
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| 103 |
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| 104 | sub get_default_process_exp {
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| 105 | my $self = shift (@_);
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| 106 |
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| 107 | return q^(?i)(\.oai)$^;
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| 108 | }
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| 109 |
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| 110 | sub get_doctype {
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| 111 | my $self = shift(@_);
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| 112 |
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| 113 | return "OAI-PMH";
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| 114 | }
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| 115 |
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| 116 | sub xml_start_document {
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| 117 | my $self = shift (@_);
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| 118 | $self->{'in_metadata_node'} = 0;
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| 119 | $self->{'rawxml'} = "";
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| 120 | $self->{'saved_metadata'} = {};
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| 121 | }
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| 122 |
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| 123 | sub xml_end_document {
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| 124 | }
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| 125 |
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| 126 | sub xml_doctype {
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| 127 | my $self = shift(@_);
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| 128 |
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| 129 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
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| 130 |
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| 131 | ##die "" if ($name !~ /^OAI-PMH$/);
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| 132 |
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| 133 | my $outhandle = $self->{'outhandle'};
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| 134 | print $outhandle "OAIPlugin: processing $self->{'file'}\n" if $self->{'verbosity'} > 1;
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| 135 | print STDERR "<Processing n='$self->{'file'}' p='OAIPlugin'>\n" if $self->{'gli'};
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| 136 |
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| 137 | }
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| 138 |
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| 139 |
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| 140 | sub xml_start_tag {
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| 141 | my $self = shift(@_);
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| 142 | my ($expat,$element) = @_;
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| 143 |
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| 144 | my %attr_hash = %_;
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| 145 |
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| 146 | my $attr = "";
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| 147 | map { $attr .= " $_=$attr_hash{$_}"; } keys %attr_hash;
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| 148 |
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| 149 | $self->{'rawxml'} .= "<$element$attr>";
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| 150 |
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| 151 | if ($element eq "metadata") {
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| 152 | $self->{'in_metadata_node'} = 1;
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| 153 | $self->{'metadata_xml'} = "";
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| 154 | }
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| 155 |
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| 156 | if ($self->{'in_metadata_node'}) {
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| 157 | $self->{'metadata_xml'} .= "<$element$attr>";
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| 158 | }
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| 159 | }
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| 160 |
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| 161 | sub xml_end_tag {
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| 162 | my $self = shift(@_);
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| 163 | my ($expat, $element) = @_;
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| 164 |
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| 165 | $self->{'rawxml'} .= "</$element>";
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| 166 |
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| 167 | if ($self->{'in_metadata_node'}) {
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| 168 | $self->{'metadata_xml'} .= "</$element>";
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| 169 | }
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| 170 |
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| 171 | if ($element eq "metadata") {
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| 172 | my $textref = \$self->{'metadata_xml'};
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| 173 | #my $metadata = $self->{'metadata'};
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| 174 | my $metadata = $self->{'saved_metadata'};
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| 175 | $self->extract_oai_metadata($textref,$metadata);
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| 176 |
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| 177 | $self->{'in_metadata_node'} = 0;
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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 |
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| 183 | sub xml_text {
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| 184 | my $self = shift(@_);
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| 185 | my ($expat) = @_;
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| 186 |
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| 187 | $self->{'rawxml'} .= $_;
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| 188 |
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| 189 | if ($self->{'in_metadata_node'}) {
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| 190 | $self->{'metadata_xml'} .= $_;
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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 | sub metadata_read {
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| 196 | my $self = shift (@_);
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| 197 |
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| 198 | my ($pluginfo, $base_dir, $file, $block_hash,
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| 199 | $extrametakeys, $extrametadata, $extrametafile,
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| 200 | $processor, $gli, $aux) = @_;
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| 201 |
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| 202 | # can we process this file??
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| 203 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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| 204 | return undef unless $self->can_process_this_file_for_metadata($filename_full_path);
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| 205 |
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| 206 | print STDERR "\n<Processing n='$file' p='OAIPlugin'>\n" if ($gli);
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| 207 | print STDERR "OAIPlugin: processing $file\n" if ($self->{'verbosity'}) > 1;
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| 208 |
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| 209 | if (!$self->parse_file($filename_full_path, $file, $gli)) {
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| 210 | $self->{'saved_metadata'} = undef;
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| 211 | return undef;
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| 212 | }
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| 213 |
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| 214 | my $verbosity = $self->{'verbosity'};
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| 215 | my $new_metadata = $self->{'saved_metadata'};
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| 216 | $self->{'saved_metadata'} = undef;
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| 217 |
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| 218 | # add the pretty metadata table as metadata
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| 219 | my $ppmd_table = $self->{'ppmd_table'};
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| 220 | $new_metadata->{'prettymd'} = $ppmd_table;
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| 221 | $self->{'ppmd_table'} = undef;
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| 222 |
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| 223 | my $document_metadata_field = $self->{'document_field'};
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| 224 | my $url_array = $new_metadata->{$document_metadata_field};
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| 225 | if (!defined $url_array) {
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| 226 | # try ex.
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| 227 | $url_array = $new_metadata->{"ex.$document_metadata_field"};
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| 228 | }
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| 229 | my $num_urls = (defined $url_array) ? scalar(@$url_array) : 0;
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| 230 | ##print STDERR "$num_urls urls for $file\n";
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| 231 | my $srcdoc_exists = 0;
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| 232 | my $srcdoc_pos = 0;
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| 233 | my $filename_dir = &util::filename_head($filename_full_path);
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| 234 |
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| 235 | # filenames in extrametadata must be relative to current dir, as
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| 236 | # DirectoryPlugin adds path info on itself
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| 237 | my ($filename_for_metadata) = $file =~ /([^\\\/]+)$/; # this assumes there will only be one record per oai file - is this always the case??
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| 238 | for (my $i=0; $i<$num_urls; $i++) {
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| 239 |
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| 240 | if ($url_array->[$i] !~ m/^(https?|ftp):/) {
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| 241 |
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| 242 | my $src_filename = &util::filename_cat($filename_dir, $url_array->[$i]);
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| 243 | if (-e $src_filename) {
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| 244 | $srcdoc_pos = $i;
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| 245 | $srcdoc_exists = 1;
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| 246 | # get the slashes the right way, use filename_cat
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| 247 | $filename_for_metadata = &util::filename_cat($url_array->[$i]);
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| 248 | last;
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| 249 | }
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| 250 | }
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| 251 | }
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| 252 |
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| 253 | if ($srcdoc_exists) {
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| 254 | $self->{'oai-files'}->{$file}->{'srcdoc_exists'} = 1;
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| 255 | }
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| 256 | else {
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| 257 | # save the rawxml for the source document
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| 258 | $self->{'oai-files'}->{$file}->{'srcdoc_exists'} = 0;
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| 259 | $self->{'oai-files'}->{$file}->{'rawxml'} = $self->{'rawxml'};
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| 260 | $self->{'rawxml'} = "";
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| 261 | }
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| 262 |
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| 263 | # return all the metadata we have extracted to the caller.
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| 264 | # Directory plug will pass it back in at read time, so we don't need to extract it again.
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| 265 |
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| 266 | # Extrametadata keys should be regular expressions
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| 267 | # Indexing into the extrameta data structures requires the filename's style of slashes to be in URL format
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| 268 | # Then need to convert the filename to a regex, no longer to protect windows directory chars \, but for
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| 269 | # protecting special characters like brackets in the filepath such as "C:\Program Files (x86)\Greenstone".
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| 270 | $filename_for_metadata = &util::filepath_to_url_format($filename_for_metadata);
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| 271 | $filename_for_metadata = &util::filename_to_regex($filename_for_metadata);
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| 272 |
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| 273 | # Check that we haven't already got some metadata
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| 274 | if (defined &extrametautil::getmetadata($extrametadata, $filename_for_metadata)) {
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| 275 | print STDERR "\n**** OAIPlugin: Need to merge new metadata with existing stored metadata: file = $filename_for_metadata\n" if $verbosity > 3;
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| 276 |
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| 277 | my $file_metadata_table = &extrametautil::getmetadata($extrametadata, $filename_for_metadata);
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| 278 |
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| 279 | foreach my $metaname (keys %{$new_metadata}) {
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| 280 | # will create new entry if one does not already exist
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| 281 | push(@{$file_metadata_table->{$metaname}}, @{$new_metadata->{$metaname}});
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| 282 | }
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| 283 |
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| 284 | } else {
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| 285 | &extrametautil::setmetadata($extrametadata, $filename_for_metadata, $new_metadata);
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| 286 | &extrametautil::addmetakey($extrametakeys, $filename_for_metadata);
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| 287 | }
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| 288 |
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| 289 | if ($srcdoc_exists) {
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| 290 | if (!defined &extrametautil::getmetafile($extrametafile, $filename_for_metadata)) {
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| 291 | &extrametautil::setmetafile($extrametafile, $filename_for_metadata, {});
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| 292 | }
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| 293 | #maps the file to full path
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| 294 | &extrametautil::setmetafile_for_named_file($extrametafile, $filename_for_metadata, $file, $filename_full_path);
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| 295 |
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| 296 | }
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| 297 | return 1;
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| 298 |
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| 299 | }
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| 300 |
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| 301 |
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| 302 | sub read {
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| 303 | my $self = shift (@_);
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| 304 |
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| 305 | my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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| 306 |
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| 307 | if (!defined $self->{'oai-files'}->{$file}) {
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| 308 | return undef;
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| 309 | }
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| 310 |
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| 311 | my $srcdoc_exists = $self->{'oai-files'}->{$file}->{'srcdoc_exists'};
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| 312 | if ($srcdoc_exists) {
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| 313 | # do nothing more - all the metadata has been extracted and associated with the srcdoc
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| 314 | # no more need to access details of this $file => tidy up as you go
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| 315 | delete $self->{'oai-files'}->{$file};
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| 316 | return 0; # not processed here, but don't pass on to rest of plugins
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| 317 | }
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| 318 |
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| 319 | my $filename = $file;
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| 320 | $filename = &util::filename_cat ($base_dir, $file) if $base_dir =~ /\w/;
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| 321 |
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| 322 | # Do encoding stuff on metadata
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| 323 | my ($language, $encoding) = $self->textcat_get_language_encoding ($filename);
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| 324 |
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| 325 | # create a new document
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| 326 | my $doc_obj = new doc ($filename, "indexed_doc", $self->{'file_rename_method'});
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| 327 | my $top_section = $doc_obj->get_top_section;
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| 328 | my $plugin_type = $self->{'plugin_type'};
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| 329 |
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| 330 | my ($filemeta) = $file =~ /([^\\\/]+)$/;
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| 331 | my $plugin_filename_encoding = $self->{'filename_encoding'};
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| 332 | my $filename_encoding = $self->deduce_filename_encoding($file,$metadata,$plugin_filename_encoding);
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| 333 | $self->set_Source_metadata($doc_obj, $filename, $filename_encoding);
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| 334 |
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| 335 | $doc_obj->add_utf8_metadata($top_section, "Language", $language);
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| 336 | $doc_obj->add_utf8_metadata($top_section, "Encoding", $encoding);
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| 337 | $doc_obj->add_utf8_metadata($top_section, "Plugin", $plugin_type);
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| 338 | $doc_obj->add_metadata($top_section, "FileFormat", "OAI");
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| 339 | $doc_obj->add_metadata($top_section, "FileSize", (-s $filename));
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| 340 |
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| 341 | # include any metadata passed in from previous plugins
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| 342 | # note that this metadata is associated with the top level section
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| 343 | # this will include all the metadata from the oai file that we extracted
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| 344 | # during metadata_read
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| 345 | $self->extra_metadata ($doc_obj, $doc_obj->get_top_section(), $metadata);
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| 346 |
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| 347 | # do plugin specific processing of doc_obj
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| 348 | my $text = $self->{'oai-files'}->{$file}->{'rawxml'};
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| 349 | delete $self->{'oai-files'}->{$file};
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| 350 |
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| 351 | unless (defined ($self->process(\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj))) {
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| 352 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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| 353 | return -1;
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| 354 | }
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| 355 |
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| 356 | # do any automatic metadata extraction
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| 357 | $self->auto_extract_metadata ($doc_obj);
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| 358 |
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| 359 | # add an OID
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| 360 | $self->add_OID($doc_obj);
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| 361 |
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| 362 | # process the document
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| 363 | $processor->process($doc_obj);
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| 364 |
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| 365 | $self->{'num_processed'} ++;
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| 366 |
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| 367 | return 1; # processed the file
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| 368 | }
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| 369 |
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| 370 |
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| 371 | # do plugin specific processing of doc_obj
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| 372 | sub process {
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| 373 | my $self = shift (@_);
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| 374 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 375 | my $outhandle = $self->{'outhandle'};
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| 376 |
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| 377 | print STDERR "<Processing n='$file' p='OAIPlugin'>\n" if ($gli);
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| 378 | print $outhandle "OAIPlugin: processing $file\n"
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| 379 | if $self->{'verbosity'} > 1;
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| 380 |
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| 381 | my $cursection = $doc_obj->get_top_section();
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| 382 |
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| 383 | ## $self->extract_metadata ($textref, $metadata, $doc_obj, $cursection);
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| 384 |
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| 385 | # add text to document object
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| 386 |
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| 387 | # $$textref =~ s/<(.*?)>/$1 /g;
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| 388 | $$textref =~ s/</</g;
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| 389 | $$textref =~ s/>/>/g;
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| 390 | $$textref =~ s/\[/[/g;
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| 391 | $$textref =~ s/\]/]/g;
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| 392 |
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| 393 | $doc_obj->add_utf8_text($cursection, $$textref);
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| 394 |
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| 395 | return 1;
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| 396 | }
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| 397 |
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| 398 |
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| 399 | # Improvement is to merge this with newer version in MetadataPass
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| 400 |
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| 401 | sub open_prettyprint_metadata_table
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| 402 | {
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| 403 | my $self = shift(@_);
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| 404 |
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| 405 | my $att = "width=100% cellspacing=2";
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| 406 | my $style = "style=\'border-bottom: 4px solid #000080\'";
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| 407 |
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| 408 | $self->{'ppmd_table'} = "\n<table $att $style>";
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| 409 | }
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| 410 |
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| 411 | sub add_prettyprint_metadata_line
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| 412 | {
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| 413 | my $self = shift(@_);
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| 414 | my ($metaname, $metavalue_utf8) = @_;
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| 415 |
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| 416 | $metavalue_utf8 = &util::hyperlink_text($metavalue_utf8);
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| 417 |
|
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| 418 | $self->{'ppmd_table'} .= " <tr bgcolor=#b5d3cd>\n";
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| 419 | $self->{'ppmd_table'} .= " <td width=30%>\n";
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| 420 | $self->{'ppmd_table'} .= " $metaname\n";
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| 421 | $self->{'ppmd_table'} .= " </td>\n";
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| 422 | $self->{'ppmd_table'} .= " <td>\n";
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| 423 | $self->{'ppmd_table'} .= " $metavalue_utf8\n";
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| 424 | $self->{'ppmd_table'} .= " </td>\n";
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| 425 | $self->{'ppmd_table'} .= " </tr>\n";
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| 426 |
|
|---|
| 427 | }
|
|---|
| 428 |
|
|---|
| 429 | sub close_prettyprint_metadata_table
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|---|
| 430 | {
|
|---|
| 431 | my $self = shift(@_);
|
|---|
| 432 |
|
|---|
| 433 | $self->{'ppmd_table'} .= "</table>\n";
|
|---|
| 434 | }
|
|---|
| 435 |
|
|---|
| 436 | my $qualified_dc_mapping = {
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|---|
| 437 | "alternative" => "dc.title",
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|---|
| 438 | "tableOfContents" => "dc.description",
|
|---|
| 439 | "abstract" => "dc.description",
|
|---|
| 440 | "created" => "dc.date",
|
|---|
| 441 | "valid" => "dc.date",
|
|---|
| 442 | "available" => "dc.date",
|
|---|
| 443 | "issued" => "dc.date",
|
|---|
| 444 | "modified" => "dc.date",
|
|---|
| 445 | "dateAccepted" => "dc.date",
|
|---|
| 446 | "dateCopyrighted" => "dc.date",
|
|---|
| 447 | "dateSubmitted" => "dc.date",
|
|---|
| 448 | "extent" => "dc.format",
|
|---|
| 449 | "medium" => "dc.format",
|
|---|
| 450 | "isVersionOf" => "dc.relation",
|
|---|
| 451 | "hasVersion" => "dc.relation",
|
|---|
| 452 | "isReplacedBy" => "dc.relation",
|
|---|
| 453 | "replaces" => "dc.relation",
|
|---|
| 454 | "isRequiredBy" => "dc.relation",
|
|---|
| 455 | "requires" => "dc.relation",
|
|---|
| 456 | "isPartOf" => "dc.relation",
|
|---|
| 457 | "hasPart" => "dc.relation",
|
|---|
| 458 | "isReferencedBy" => "dc.relation",
|
|---|
| 459 | "references" => "dc.relation",
|
|---|
| 460 | "isFormatOf" => "dc.relation",
|
|---|
| 461 | "hasFormat" => "dc.relation",
|
|---|
| 462 | "conformsTo" => "dc.relation",
|
|---|
| 463 | "spatial" => "dc.coverage",
|
|---|
| 464 | "temporal" => "dc.coverage",
|
|---|
| 465 | # these are now top level elements in our qualified dc metadata set
|
|---|
| 466 | # "audience" => "dc.any",
|
|---|
| 467 | # "accrualMethod" => "dc.any",
|
|---|
| 468 | # "accrualPeriodicity" => "dc.any",
|
|---|
| 469 | # "accrualPolicy" => "dc.any",
|
|---|
| 470 | # "instructionalMethod" => "dc.any",
|
|---|
| 471 | # "provenance" => "dc.any",
|
|---|
| 472 | # "rightsHolder" => "dc.any",
|
|---|
| 473 | "mediator" => "dc.audience",
|
|---|
| 474 | "educationLevel" => "dc.audience",
|
|---|
| 475 | "accessRights" => "dc.rights",
|
|---|
| 476 | "license" => "dc.rights",
|
|---|
| 477 | "bibliographicCitation" => "dc.identifier"
|
|---|
| 478 | };
|
|---|
| 479 |
|
|---|
| 480 | sub remap_dc_metadata
|
|---|
| 481 | {
|
|---|
| 482 | my $self = shift(@_);
|
|---|
| 483 |
|
|---|
| 484 | my ($metaname) = @_;
|
|---|
| 485 |
|
|---|
| 486 | my ($prefix,$name) = ($metaname =~ m/^(.*?)\.(.*?)$/);
|
|---|
| 487 |
|
|---|
| 488 | if (defined $qualified_dc_mapping->{$name}) {
|
|---|
| 489 |
|
|---|
| 490 | return $qualified_dc_mapping->{$name}."^".$name;
|
|---|
| 491 | }
|
|---|
| 492 |
|
|---|
| 493 |
|
|---|
| 494 | return $metaname; # didn't get a match, return param passed in unchanged
|
|---|
| 495 | }
|
|---|
| 496 |
|
|---|
| 497 |
|
|---|
| 498 | sub extract_oai_metadata {
|
|---|
| 499 | my $self = shift (@_);
|
|---|
| 500 | my ($textref, $metadata) = @_;
|
|---|
| 501 | my $outhandle = $self->{'outhandle'};
|
|---|
| 502 |
|
|---|
| 503 | $self->open_prettyprint_metadata_table();
|
|---|
| 504 |
|
|---|
| 505 | # need to decode the string, else it will be double-encoded at this point
|
|---|
| 506 | $$textref = decode("utf-8",$$textref);
|
|---|
| 507 |
|
|---|
| 508 | # Debugging encoding issues with Devel::Peek's Dump() which prints octal and hexcode
|
|---|
| 509 | # print STDERR "#### text ref: $$textref\n";
|
|---|
| 510 | # print STDERR "\n@@@\n";
|
|---|
| 511 | # Dump($$textref);
|
|---|
| 512 | # print STDERR "\n";
|
|---|
| 513 |
|
|---|
| 514 | if ($$textref =~ m/<metadata\s*>(.*?)<\/metadata\s*>/s)
|
|---|
| 515 | {
|
|---|
| 516 | my $metadata_text = $1;
|
|---|
| 517 |
|
|---|
| 518 | # locate and remove outermost tag (ignoring any attribute information in top-level tag)
|
|---|
| 519 | my ($outer_tagname,$inner_metadata_text) = ($metadata_text =~ m/<([^ >]+).*?>(.*?)<\/\1>/s);
|
|---|
| 520 | # split tag into namespace and tag name
|
|---|
| 521 | my($namespace,$top_level_prefix) = ($outer_tagname =~ m/^(.*?):(.*?)$/);
|
|---|
| 522 | # sometimes, the dc namespace is not specified as the prefix in each element (like <dc:title>)
|
|---|
| 523 | # but is rather defined in the wrapper element containing the various dc meta elements,
|
|---|
| 524 | # like <dc><title></title><creator></creator></dc>.
|
|---|
| 525 | # In such a case, we use this wrapper element as the top_level_prefix
|
|---|
| 526 |
|
|---|
| 527 | # if there was no prefix, then the tag itself becomes the top_level_prefix
|
|---|
| 528 | if(!defined $top_level_prefix && defined $outer_tagname) {
|
|---|
| 529 | $top_level_prefix = $outer_tagname;
|
|---|
| 530 | }
|
|---|
| 531 |
|
|---|
| 532 | #process each element one by one
|
|---|
| 533 | while ($inner_metadata_text =~ m/<([^ >]+).*?>(.*?)<\/\1>(.*)/s)
|
|---|
| 534 | {
|
|---|
| 535 |
|
|---|
| 536 | my $metaname = $1;
|
|---|
| 537 | my $metavalue = $2;
|
|---|
| 538 | $inner_metadata_text = $3;
|
|---|
| 539 |
|
|---|
| 540 | # greenstone uses . for namespace, while oai uses :
|
|---|
| 541 | $metaname =~ s/:/\./;
|
|---|
| 542 | # if there is no namespace, then we use the outer tag name or
|
|---|
| 543 | # namespace for this element
|
|---|
| 544 | if ($metaname !~ m/\./)
|
|---|
| 545 | {
|
|---|
| 546 | $metaname = "$top_level_prefix.$metaname";
|
|---|
| 547 | }
|
|---|
| 548 |
|
|---|
| 549 | # if metadata set is auto, leave as is, otherwise convert to
|
|---|
| 550 | # specified namespace
|
|---|
| 551 | if ($self->{'metadata_set'} ne "auto") {
|
|---|
| 552 | if ($metaname !~ /^gi\./) { # hack to not overwrite gi metadata
|
|---|
| 553 | $metaname =~ s/^([^\.]*)\./$self->{'metadata_set'}\./;
|
|---|
| 554 | if ($self->{'metadata_set'} eq "dc") {
|
|---|
| 555 | # convert qualified dc terms to gs version, e.g.
|
|---|
| 556 | # spatial becomes coverage^spatial
|
|---|
| 557 | $metaname = $self->remap_dc_metadata($metaname);
|
|---|
| 558 | }
|
|---|
| 559 | }
|
|---|
| 560 | }
|
|---|
| 561 |
|
|---|
| 562 | # uppercase the first char of the name
|
|---|
| 563 | $metaname =~ s/\.(.)/\.\u$1/;
|
|---|
| 564 | $metavalue =~ s/\[/[/g;
|
|---|
| 565 | $metavalue =~ s/\]/]/g;
|
|---|
| 566 |
|
|---|
| 567 | # so that GLI can see this metadata, store here as ex.dc.Title etc
|
|---|
| 568 | my $ex_metaname = $metaname;
|
|---|
| 569 | $ex_metaname =~ s/^ex\.//; # remove any pre-existing ex. prefix
|
|---|
| 570 | $ex_metaname = "ex.$ex_metaname"; # at last can prefix ex.
|
|---|
| 571 |
|
|---|
| 572 | if (defined $metadata->{$ex_metaname})
|
|---|
| 573 | {
|
|---|
| 574 | push(@{$metadata->{$ex_metaname}},$metavalue);
|
|---|
| 575 |
|
|---|
| 576 | }
|
|---|
| 577 | else
|
|---|
| 578 | {
|
|---|
| 579 | $metadata->{$ex_metaname} = [ $metavalue ];
|
|---|
| 580 | }
|
|---|
| 581 |
|
|---|
| 582 | # but don't add ex to the pretty print line
|
|---|
| 583 | $self->add_prettyprint_metadata_line($metaname, $metavalue);
|
|---|
| 584 |
|
|---|
| 585 | }
|
|---|
| 586 | }
|
|---|
| 587 |
|
|---|
| 588 | $self->close_prettyprint_metadata_table();
|
|---|
| 589 | }
|
|---|
| 590 |
|
|---|
| 591 | ## we know from the file extension, so doesn't need to check the doctype
|
|---|
| 592 | sub check_doctype {
|
|---|
| 593 |
|
|---|
| 594 | return 1;
|
|---|
| 595 | }
|
|---|
| 596 |
|
|---|
| 597 | 1;
|
|---|
