| 1 | ###########################################################################
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| 2 | #
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| 3 | # RecPlug.pm --
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | # RecPlug is a plugin which recurses through directories processing
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| 27 | # each file it finds.
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| 28 |
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| 29 | # RecPlug has one option: use_metadata_files. When this is set, it will
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| 30 | # check each directory for an XML file called "metadata.xml" that specifies
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| 31 | # metadata for the files (and subdirectories) in the directory.
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| 32 | #
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| 33 | # Here's an example of a metadata file that uses three FileSet structures
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| 34 | # (ignore the # characters):
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| 35 |
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| 36 | #<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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| 37 | #<!DOCTYPE DirectoryMetadata SYSTEM "http://greenstone.org/dtd/DirectoryMetadata/1.0/DirectoryMetadata.dtd">
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| 38 | #<DirectoryMetadata>
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| 39 | # <FileSet>
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| 40 | # <FileName>nugget.*</FileName>
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| 41 | # <Description>
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| 42 | # <Metadata name="Title">Nugget Point, The Catlins</Metadata>
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| 43 | # <Metadata name="Place" mode="accumulate">Nugget Point</Metadata>
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| 44 | # </Description>
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| 45 | # </FileSet>
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| 46 | # <FileSet>
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| 47 | # <FileName>nugget-point-1.jpg</FileName>
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| 48 | # <Description>
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| 49 | # <Metadata name="Title">Nugget Point Lighthouse, The Catlins</Metadata>
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| 50 | # <Metadata name="Subject">Lighthouse</Metadata>
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| 51 | # </Description>
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| 52 | # </FileSet>
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| 53 | # <FileSet>
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| 54 | # <FileName>kaka-point-dir</FileName>
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| 55 | # <Description>
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| 56 | # <Metadata name="Title">Kaka Point, The Catlins</Metadata>
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| 57 | # </Description>
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| 58 | # </FileSet>
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| 59 | #</DirectoryMetadata>
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| 60 |
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| 61 | # Metadata elements are read and applied to files in the order they appear
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| 62 | # in the file.
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| 63 | #
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| 64 | # The FileName element describes the subfiles in the directory that the
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| 65 | # metadata applies to as a perl regular expression (a FileSet group may
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| 66 | # contain multiple FileName elements). So, <FileName>nugget.*</FileName>
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| 67 | # indicates that the metadata records in the following Description block
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| 68 | # apply to every subfile that starts with "nugget". For these files, a
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| 69 | # Title metadata element is set, overriding any old value that the Title
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| 70 | # might have had.
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| 71 | #
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| 72 | # Occasionally, we want to have multiple metadata values applied to a
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| 73 | # document; in this case we use the "mode=accumulate" attribute of the
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| 74 | # particular Metadata element. In the second metadata element of the first
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| 75 | # FileSet above, the "Place" metadata is accumulating, and may therefore be
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| 76 | # given several values. If we wanted to override these values and use a
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| 77 | # single metadata element again, we could set the mode attribute to
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| 78 | # "override" instead. Remember: every element is assumed to be in override
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| 79 | # mode unless you specify otherwise, so if you want to accumulate metadata
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| 80 | # for some field, every occurance must have "mode=accumulate" specified.
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| 81 | #
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| 82 | # The second FileSet element above applies to a specific file, called
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| 83 | # nugget-point-1.jpg. This element overrides the Title metadata set in the
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| 84 | # first FileSet, and adds a "Subject" metadata field.
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| 85 | #
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| 86 | # The third and final FileSet sets metadata for a subdirectory rather than
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| 87 | # a file. The metadata specified (a Title) will be passed into the
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| 88 | # subdirectory and applied to every file that occurs in the subdirectory
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| 89 | # (and to every subsubdirectory and its contents, and so on) unless the
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| 90 | # metadata is explictly overridden later in the import.
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| 91 |
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| 92 |
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| 93 |
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| 94 | package RecPlug;
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| 95 |
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| 96 | use BasPlug;
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| 97 | use plugin;
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| 98 | use util;
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| 99 |
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| 100 | use File::Basename;
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| 101 |
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| 102 |
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| 103 | BEGIN {
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| 104 | @RecPlug::ISA = ('BasPlug');
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| 105 | unshift (@INC, "$ENV{'GSDLHOME'}/perllib/cpan");
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| 106 | }
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| 107 |
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| 108 | use XMLParser;
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| 109 |
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| 110 | my $arguments =
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| 111 | [ { 'name' => "block_exp",
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| 112 | 'desc' => "{BasPlug.block_exp}",
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| 113 | 'type' => "regexp",
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| 114 | 'deft' => &get_default_block_exp(),
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| 115 | 'reqd' => "no" },
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| 116 | { 'name' => "use_metadata_files",
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| 117 | 'desc' => "{RecPlug.use_metadata_files}",
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| 118 | 'type' => "flag",
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| 119 | 'reqd' => "no" },
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| 120 | { 'name' => "recheck_directories",
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| 121 | 'desc' => "{RecPlug.recheck_directories}",
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| 122 | 'type' => "flag",
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| 123 | 'reqd' => "no" } ];
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| 124 |
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| 125 | my $options = { 'name' => "RecPlug",
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| 126 | 'desc' => "{RecPlug.desc}",
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| 127 | 'abstract' => "no",
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| 128 | 'inherits' => "yes",
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| 129 | 'args' => $arguments };
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| 130 |
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| 131 |
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| 132 | my ($self);
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| 133 | sub new {
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| 134 | my $class = shift (@_);
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| 135 |
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| 136 | # $self is global for use within subroutines called by XML::Parser
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| 137 | $self = new BasPlug ($class, @_);
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| 138 |
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| 139 | # 14-05-02 To allow for proper inheritance of arguments - John Thompson
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| 140 | my $option_list = $self->{'option_list'};
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| 141 | push( @{$option_list}, $options );
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| 142 |
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| 143 | if (!parsargv::parse(\@_,
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| 144 | q^use_metadata_files^, \$self->{'use_metadata_files'},
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| 145 | q^recheck_directories^, \$self->{'recheck_directories'},
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| 146 | "allow_extra_options")) {
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| 147 | print STDERR "\nRecPlug uses an incorrect option.\n";
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| 148 | print STDERR "Check your collect.cfg configuration file.\n\n";
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| 149 | $self->print_txt_usage(""); # Use default resource bundle
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| 150 | die "\n";
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| 151 | }
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| 152 |
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| 153 | if ($self->{'use_metadata_files'}) {
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| 154 | # create XML::Parser object for parsing metadata.xml files
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| 155 | my $parser = new XML::Parser('Style' => 'Stream',
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| 156 | 'Handlers' => {'Char' => \&Char,
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| 157 | 'Doctype' => \&Doctype
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| 158 | });
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| 159 | $self->{'parser'} = $parser;
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| 160 | $self->{'in_filename'} = 0;
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| 161 | }
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| 162 |
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| 163 | $self->{'subdir_extrametakeys'} = {};
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| 164 |
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| 165 | return bless $self, $class;
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| 166 | }
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| 167 |
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| 168 | # return 1 if this class might recurse using $pluginfo
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| 169 | sub is_recursive {
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| 170 | my $self = shift (@_);
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| 171 |
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| 172 | return 1;
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| 173 | }
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| 174 |
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| 175 | sub get_default_block_exp {
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| 176 | my $self = shift (@_);
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| 177 |
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| 178 | return 'CVS';
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| 179 | }
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| 180 |
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| 181 | # return number of files processed, undef if can't process
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| 182 | # Note that $base_dir might be "" and that $file might
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| 183 | # include directories
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| 184 |
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| 185 | # This function passes around metadata hash structures. Metadata hash
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| 186 | # structures are hashes that map from a (scalar) key (the metadata element
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| 187 | # name) to either a scalar metadata value or a reference to an array of
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| 188 | # such values.
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| 189 |
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| 190 | sub read {
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| 191 | my $self = shift (@_);
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| 192 | my ($pluginfo, $base_dir, $file, $in_metadata, $processor, $maxdocs, $gli) = @_;
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| 193 |
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| 194 | my $outhandle = $self->{'outhandle'};
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| 195 | my $verbosity = $self->{'verbosity'};
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| 196 | my $read_metadata_files = $self->{'use_metadata_files'};
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| 197 |
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| 198 | # Calculate the directory name and ensure it is a directory and
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| 199 | # that it is not explicitly blocked.
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| 200 | my $dirname = $file;
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| 201 | $dirname = &util::filename_cat ($base_dir, $file) if $base_dir =~ /\w/;
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| 202 | return undef unless (-d $dirname);
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| 203 | return 0 if ($self->{'block_exp'} ne "" && $dirname =~ /$self->{'block_exp'}/);
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| 204 |
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| 205 | # check to make sure we're not reading the archives or index directory
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| 206 | my $gsdlhome = quotemeta($ENV{'GSDLHOME'});
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| 207 | if ($dirname =~ m/^$gsdlhome\/.*?\/import.*?\/(archives|index)$/) {
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| 208 | print $outhandle "RecPlug: $dirname appears to be a reference to a Greenstone collection, skipping.\n";
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| 209 | return 0;
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| 210 | }
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| 211 |
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| 212 | # check to see we haven't got a cyclic path...
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| 213 | if ($dirname =~ m%(/.*){,41}%) {
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| 214 | print $outhandle "RecPlug: $dirname is 40 directories deep, is this a recursive path? if not increase constant in RecPlug.pm.\n";
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| 215 | return 0;
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| 216 | }
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| 217 |
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| 218 | # check to see we haven't got a cyclic path...
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| 219 | if ($dirname =~ m%.*?import/(.+?)/import/\1.*%) {
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| 220 | print $outhandle "RecPlug: $dirname appears to be in a recursive loop...\n";
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| 221 | return 0;
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| 222 | }
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| 223 |
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| 224 | if (($verbosity > 2) && ((scalar keys %$in_metadata) > 0)) {
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| 225 | print $outhandle "RecPlug: metadata passed in: ",
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| 226 | join(", ", keys %$in_metadata), "\n";
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| 227 | }
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| 228 |
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| 229 | # Recur over directory contents.
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| 230 | my (@dir, $subfile);
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| 231 | my $count = 0;
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| 232 |
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| 233 | print $outhandle "RecPlug: getting directory $dirname\n" if ($verbosity);
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| 234 |
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| 235 | # find all the files in the directory
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| 236 | if (!opendir (DIR, $dirname)) {
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| 237 | print $outhandle "RecPlug: WARNING - couldn't read directory $dirname\n";
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| 238 | return -1; # error in processing
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| 239 | }
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| 240 | @dir = readdir (DIR);
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| 241 | closedir (DIR);
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| 242 |
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| 243 | # Re-order the files in the list so any directories ending with .all are moved to the end
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| 244 | for (my $i = scalar(@dir) - 1; $i >= 0; $i--) {
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| 245 | if (-d &util::filename_cat($dirname, $dir[$i]) && $dir[$i] =~ /\.all$/) {
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| 246 | push(@dir, splice(@dir, $i, 1));
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| 247 | }
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| 248 | }
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| 249 |
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| 250 | # read XML metadata files (if supplied)
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| 251 | my $additionalmetadata = 0; # is there extra metadata available?
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| 252 | my %extrametadata; # maps from filespec to extra metadata keys
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| 253 | my @extrametakeys; # keys of %extrametadata in order read
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| 254 |
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| 255 | my $dirsepre = &util::get_re_dirsep();
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| 256 | my $dirsep = &util::get_dirsep();
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| 257 | my $local_dirname = $dirname;
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| 258 | $local_dirname =~ s/^$base_dir($dirsepre)//;
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| 259 | $local_dirname .= $dirsep;
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| 260 |
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| 261 | if (defined $self->{'subdir_extrametakeys'}->{$local_dirname}) {
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| 262 | print STDERR "**** Matching on dirname = $local_dirname\n";
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| 263 | my $extrakeys = $self->{'subdir_extrametakeys'}->{$local_dirname};
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| 264 | foreach my $ek (@$extrakeys) {
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| 265 | my $extrakeys_re = $ek->{'re'};
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| 266 | my $extrakeys_md = $ek->{'md'};
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| 267 | push(@extrametakeys,$extrakeys_re);
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| 268 | $extrametadata{$extrakeys_re} = $extrakeys_md;
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| 269 | }
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| 270 | delete($self->{'subdir_extrametakeys'}->{$local_dirname});
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| 271 | }
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| 272 |
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| 273 | if ($read_metadata_files) {
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| 274 | #read the directory "metadata.xml" file
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| 275 | my $metadatafile = &util::filename_cat ($dirname, 'metadata.xml');
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| 276 | if (-e $metadatafile) {
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| 277 | print $outhandle "RecPlug: found metadata in $metadatafile\n"
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| 278 | if ($verbosity);
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| 279 | $self->read_metadata_xml_file($metadatafile, \%extrametadata, \@extrametakeys);
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| 280 | $additionalmetadata = 1;
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| 281 | }
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| 282 | }
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| 283 |
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| 284 | # import each of the files in the directory
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| 285 | my $out_metadata;
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| 286 | my $num_files = scalar(@dir);
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| 287 | for (my $i = 0; $i < scalar(@dir); $i++) {
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| 288 | my $subfile = $dir[$i];
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| 289 | my $this_file_base_dir = $base_dir;
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| 290 | last if ($maxdocs != -1 && $count >= $maxdocs);
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| 291 | next if ($subfile =~ /^\.\.?$/);
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| 292 | #next if ($read_metadata_files && $subfile =~ /metadata\.xml$/);
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| 293 |
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| 294 | # Recursively read each $subfile
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| 295 | print $outhandle "RecPlug metadata recurring: $subfile\n" if ($verbosity > 2);
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| 296 |
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| 297 | $count += &plugin::metadata_read ($pluginfo, $this_file_base_dir,
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| 298 | &util::filename_cat($file, $subfile),
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| 299 | $out_metadata, \@extrametakeys, \%extrametadata,
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| 300 | $processor, $maxdocs, $gli);
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| 301 | $additionalmetadata = 1;
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| 302 | }
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| 303 |
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| 304 | # filter out any extrametakeys that mention subdirectories and store
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| 305 | # for later use (i.e. when that sub-directory is being processed)
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| 306 |
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| 307 | foreach my $ek (@extrametakeys) {
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| 308 | my ($subdir_re,$extrakey_dir) = &File::Basename::fileparse($ek);
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| 309 | $extrakey_dir =~ s/\\\./\./g; # remove RE syntax
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| 310 |
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| 311 | my $dirsep_re = &util::get_re_dirsep();
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| 312 |
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| 313 | if ($ek =~ m/$dirsep_re/) { # specifies at least one directory
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| 314 | my $md = $extrametadata{$ek};
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| 315 |
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| 316 | my $subdir_extrametakeys = $self->{'subdir_extrametakeys'};
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| 317 | print STDERR "*** pushing on $subdir_re for $extrakey_dir\n";
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| 318 |
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| 319 | my $subdir_rec = { 're' => $subdir_re, 'md' => $md };
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| 320 | push(@{$subdir_extrametakeys->{$extrakey_dir}},$subdir_rec);
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| 321 | }
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| 322 | }
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| 323 |
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| 324 | # import each of the files in the directory
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| 325 | $count=0;
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| 326 | for (my $i = 0; $i <= scalar(@dir); $i++) {
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| 327 | # When every file in the directory has been done, pause for a moment (figuratively!)
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| 328 | # If the -recheck_directories argument hasn't been provided, stop now (default)
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| 329 | # Otherwise, re-read the contents of the directory to check for new files
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| 330 | # Any new files are added to the @dir list and are processed as normal
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| 331 | # This is necessary when documents to be indexed are specified in bibliographic DBs
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| 332 | # These files are copied/downloaded and stored in a new folder at import time
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| 333 | if ($i == $num_files) {
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| 334 | last unless $self->{'recheck_directories'};
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| 335 |
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| 336 | # Re-read the files in the directory to see if there are any new files
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| 337 | last if (!opendir (DIR, $dirname));
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| 338 | my @dirnow = readdir (DIR);
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| 339 | closedir (DIR);
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| 340 |
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| 341 | # We're only interested if there are more files than there were before
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| 342 | last if (scalar(@dirnow) <= scalar(@dir));
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| 343 |
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| 344 | # Any new files are added to the end of @dir to get processed by the loop
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| 345 | my $j;
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| 346 | foreach my $subfilenow (@dirnow) {
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| 347 | for ($j = 0; $j < $num_files; $j++) {
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| 348 | last if ($subfilenow eq $dir[$j]);
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| 349 | }
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| 350 | if ($j == $num_files) {
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| 351 | # New file
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| 352 | push(@dir, $subfilenow);
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| 353 | }
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| 354 | }
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| 355 | # When the new files have been processed, check again
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| 356 | $num_files = scalar(@dir);
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| 357 | }
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| 358 |
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| 359 | my $subfile = $dir[$i];
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| 360 | my $this_file_base_dir = $base_dir;
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| 361 | last if ($maxdocs != -1 && $count >= $maxdocs);
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| 362 | next if ($subfile =~ /^\.\.?$/);
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| 363 | next if ($read_metadata_files && $subfile =~ /metadata\.xml$/);
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| 364 |
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| 365 | # Follow Windows shortcuts
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| 366 | if ($subfile =~ /(?i)\.lnk$/ && $ENV{'GSDLOS'} =~ /^windows$/i) {
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| 367 | require Win32::Shortcut;
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| 368 | my $shortcut = new Win32::Shortcut(&util::filename_cat($dirname, $subfile));
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| 369 | if ($shortcut) {
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| 370 | # The file to be processed is now the target of the shortcut
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| 371 | $this_file_base_dir = "";
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| 372 | $file = "";
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| 373 | $subfile = $shortcut->Path;
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| 374 | }
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| 375 | }
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| 376 |
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| 377 | # check for a symlink pointing back to a leading directory
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| 378 | if (-d "$dirname/$subfile" && -l "$dirname/$subfile") {
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| 379 | # readlink gives a "fatal error" on systems that don't implement
|
|---|
| 380 | # symlinks. This assumes the the -l test above would fail on those.
|
|---|
| 381 | my $linkdest=readlink "$dirname/$subfile";
|
|---|
| 382 | if (!defined ($linkdest)) {
|
|---|
| 383 | # system error - file not found?
|
|---|
| 384 | warn "RecPlug: symlink problem - $!";
|
|---|
| 385 | } else {
|
|---|
| 386 | # see if link points to current or a parent directory
|
|---|
| 387 | if ($linkdest =~ m@^[\./\\]+$@ ||
|
|---|
| 388 | index($dirname, $linkdest) != -1) {
|
|---|
| 389 | warn "RecPlug: Ignoring recursive symlink ($dirname/$subfile -> $linkdest)\n";
|
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| 390 | next;
|
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| 391 | ;
|
|---|
| 392 | }
|
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| 393 | }
|
|---|
| 394 | }
|
|---|
| 395 |
|
|---|
| 396 | print $outhandle "RecPlug: preparing metadata for $subfile\n" if ($verbosity > 2);
|
|---|
| 397 |
|
|---|
| 398 | # Make a copy of $in_metadata to pass to $subfile
|
|---|
| 399 | $out_metadata = {};
|
|---|
| 400 | &combine_metadata_structures($out_metadata, $in_metadata);
|
|---|
| 401 |
|
|---|
| 402 | # Next add metadata read in XML files (if it is supplied)
|
|---|
| 403 | if ($additionalmetadata == 1) {
|
|---|
| 404 | my ($filespec, $mdref);
|
|---|
| 405 | foreach $filespec (@extrametakeys) {
|
|---|
| 406 | if ($subfile =~ /^$filespec$/) {
|
|---|
| 407 | print $outhandle "File \"$subfile\" matches filespec \"$filespec\"\n"
|
|---|
| 408 | if ($verbosity > 2);
|
|---|
| 409 | $mdref = $extrametadata{$filespec};
|
|---|
| 410 | &combine_metadata_structures($out_metadata, $mdref);
|
|---|
| 411 | }
|
|---|
| 412 | }
|
|---|
| 413 | }
|
|---|
| 414 |
|
|---|
| 415 | # Recursively read each $subfile
|
|---|
| 416 | print $outhandle "RecPlug recurring: $subfile\n" if ($verbosity > 2);
|
|---|
| 417 |
|
|---|
| 418 | $count += &plugin::read ($pluginfo, $this_file_base_dir,
|
|---|
| 419 | &util::filename_cat($file, $subfile),
|
|---|
| 420 | $out_metadata, $processor, $maxdocs, $gli);
|
|---|
| 421 | }
|
|---|
| 422 |
|
|---|
| 423 | return $count;
|
|---|
| 424 | }
|
|---|
| 425 |
|
|---|
| 426 |
|
|---|
| 427 |
|
|---|
| 428 | # Read a manually-constructed metadata file and store the data
|
|---|
| 429 | # it contains in the $metadataref structure.
|
|---|
| 430 | #
|
|---|
| 431 | # (metadataref is a reference to a hash whose keys are filenames
|
|---|
| 432 | # and whose values are metadata hash structures.)
|
|---|
| 433 |
|
|---|
| 434 | sub read_metadata_xml_file {
|
|---|
| 435 | my $self = shift(@_);
|
|---|
| 436 | my ($filename, $metadataref, $metakeysref) = @_;
|
|---|
| 437 | $self->{'metadataref'} = $metadataref;
|
|---|
| 438 | $self->{'metakeysref'} = $metakeysref;
|
|---|
| 439 |
|
|---|
| 440 | eval {
|
|---|
| 441 | $self->{'parser'}->parsefile($filename);
|
|---|
| 442 | };
|
|---|
| 443 |
|
|---|
| 444 | if ($@) {
|
|---|
| 445 | die "RecPlug: ERROR $filename is not a well formed metadata.xml file ($@)\n";
|
|---|
| 446 | }
|
|---|
| 447 | }
|
|---|
| 448 |
|
|---|
| 449 | sub Doctype {
|
|---|
| 450 | my ($expat, $name, $sysid, $pubid, $internal) = @_;
|
|---|
| 451 |
|
|---|
| 452 | # allow the short-lived and badly named "GreenstoneDirectoryMetadata" files
|
|---|
| 453 | # to be processed as well as the "DirectoryMetadata" files which should now
|
|---|
| 454 | # be created by import.pl
|
|---|
| 455 | die if ($name !~ /^(Greenstone)?DirectoryMetadata$/);
|
|---|
| 456 | }
|
|---|
| 457 |
|
|---|
| 458 | sub StartTag {
|
|---|
| 459 | my ($expat, $element) = @_;
|
|---|
| 460 |
|
|---|
| 461 | if ($element eq "FileSet") {
|
|---|
| 462 | $self->{'saved_targets'} = [];
|
|---|
| 463 | $self->{'saved_metadata'} = {};
|
|---|
| 464 | }
|
|---|
| 465 | elsif ($element eq "FileName") {
|
|---|
| 466 | $self->{'in_filename'} = 1;
|
|---|
| 467 | }
|
|---|
| 468 | elsif ($element eq "Metadata") {
|
|---|
| 469 | $self->{'metadata_name'} = $_{'name'};
|
|---|
| 470 | if ((defined $_{'mode'}) && ($_{'mode'} eq "accumulate")) {
|
|---|
| 471 | $self->{'metadata_accumulate'} = 1;
|
|---|
| 472 | } else {
|
|---|
| 473 | $self->{'metadata_accumulate'} = 0;
|
|---|
| 474 | }
|
|---|
| 475 | }
|
|---|
| 476 | }
|
|---|
| 477 |
|
|---|
| 478 | sub EndTag {
|
|---|
| 479 | my ($expat, $element) = @_;
|
|---|
| 480 |
|
|---|
| 481 | if ($element eq "FileSet") {
|
|---|
| 482 | push (@{$self->{'metakeysref'}}, @{$self->{'saved_targets'}});
|
|---|
| 483 | foreach my $target (@{$self->{'saved_targets'}}) {
|
|---|
| 484 | $self->{'metadataref'}->{$target} = $self->{'saved_metadata'};
|
|---|
| 485 | }
|
|---|
| 486 | }
|
|---|
| 487 | elsif ($element eq "FileName") {
|
|---|
| 488 | $self->{'in_filename'} = 0;
|
|---|
| 489 | }
|
|---|
| 490 | elsif ($element eq "Metadata") {
|
|---|
| 491 | $self->{'metadata_name'} = "";
|
|---|
| 492 | }
|
|---|
| 493 |
|
|---|
| 494 | }
|
|---|
| 495 |
|
|---|
| 496 | sub Text {
|
|---|
| 497 |
|
|---|
| 498 | if ($self->{'in_filename'}) {
|
|---|
| 499 | # $_ == FileName content
|
|---|
| 500 | push (@{$self->{'saved_targets'}}, $_);
|
|---|
| 501 | }
|
|---|
| 502 | elsif (defined ($self->{'metadata_name'}) && $self->{'metadata_name'} ne "") {
|
|---|
| 503 | # $_ == Metadata content
|
|---|
| 504 | my $mname = $self->{'metadata_name'};
|
|---|
| 505 | if (defined $self->{'saved_metadata'}->{$mname}) {
|
|---|
| 506 | if ($self->{'metadata_accumulate'}) {
|
|---|
| 507 | # accumulate mode - add value to existing value(s)
|
|---|
| 508 | if (ref ($self->{'saved_metadata'}->{$mname}) eq "ARRAY") {
|
|---|
| 509 | push (@{$self->{'saved_metadata'}->{$mname}}, $_);
|
|---|
| 510 | } else {
|
|---|
| 511 | $self->{'saved_metadata'}->{$mname} =
|
|---|
| 512 | [$self->{'saved_metadata'}->{$mname}, $_];
|
|---|
| 513 | }
|
|---|
| 514 | } else {
|
|---|
| 515 | # override mode
|
|---|
| 516 | $self->{'saved_metadata'}->{$mname} = $_;
|
|---|
| 517 | }
|
|---|
| 518 | } else {
|
|---|
| 519 | if ($self->{'metadata_accumulate'}) {
|
|---|
| 520 | # accumulate mode - add value into (currently empty) array
|
|---|
| 521 | $self->{'saved_metadata'}->{$mname} = [$_];
|
|---|
| 522 | } else {
|
|---|
| 523 | # override mode
|
|---|
| 524 | $self->{'saved_metadata'}->{$mname} = $_;
|
|---|
| 525 | }
|
|---|
| 526 | }
|
|---|
| 527 | }
|
|---|
| 528 | }
|
|---|
| 529 |
|
|---|
| 530 | # This Char function overrides the one in XML::Parser::Stream to overcome a
|
|---|
| 531 | # problem where $expat->{Text} is treated as the return value, slowing
|
|---|
| 532 | # things down significantly in some cases.
|
|---|
| 533 | sub Char {
|
|---|
| 534 | $_[0]->{'Text'} .= $_[1];
|
|---|
| 535 | return undef;
|
|---|
| 536 | }
|
|---|
| 537 |
|
|---|
| 538 | # Combine two metadata structures. Given two references to metadata
|
|---|
| 539 | # element structures, add every field of the second ($mdref2) to the first
|
|---|
| 540 | # ($mdref1).
|
|---|
| 541 | #
|
|---|
| 542 | # Afterwards $mdref1 will be updated, and $mdref2 will be unchanged.
|
|---|
| 543 | #
|
|---|
| 544 | # We have to be careful about the way we merge metadata when one metadata
|
|---|
| 545 | # structure is in "override" mode and one is in "merge" mode. In fact, we
|
|---|
| 546 | # use the mode from the second structure, $mdref2, because it is generally
|
|---|
| 547 | # defined later (lower in the directory structure) and is therefore more
|
|---|
| 548 | # "local" to the document concerned.
|
|---|
| 549 | #
|
|---|
| 550 | # Another issue is the use of references to pass metadata around. If we
|
|---|
| 551 | # simply copy one metadata structure reference to another, then we're
|
|---|
| 552 | # effectively just copyinga pointer, and changes to the new referene
|
|---|
| 553 | # will affect the old (copied) one also. This also applies to ARRAY
|
|---|
| 554 | # references used as metadata element values (hence the "clonedata"
|
|---|
| 555 | # function below).
|
|---|
| 556 |
|
|---|
| 557 | sub combine_metadata_structures {
|
|---|
| 558 | my ($mdref1, $mdref2) = @_;
|
|---|
| 559 | my ($key, $value1, $value2);
|
|---|
| 560 |
|
|---|
| 561 | foreach $key (keys %$mdref2) {
|
|---|
| 562 |
|
|---|
| 563 | $value1 = $mdref1->{$key};
|
|---|
| 564 | $value2 = $mdref2->{$key};
|
|---|
| 565 |
|
|---|
| 566 | # If there is no existing value for this metadata field in
|
|---|
| 567 | # $mdref1, so we simply copy the value from $mdref2 over.
|
|---|
| 568 | if (!defined $value1) {
|
|---|
| 569 | $mdref1->{$key} = &clonedata($value2);
|
|---|
| 570 | }
|
|---|
| 571 | # Otherwise we have to add the new values to the existing ones.
|
|---|
| 572 | # If the second structure is accumulated, then acculate all the
|
|---|
| 573 | # values into the first structure
|
|---|
| 574 | elsif ((ref $value2) eq "ARRAY") {
|
|---|
| 575 | # If the first metadata element is a scalar we have to
|
|---|
| 576 | # convert it into an array before we add anything more.
|
|---|
| 577 | if ((ref $value1) ne 'ARRAY') {
|
|---|
| 578 | $mdref1->{$key} = [$value1];
|
|---|
| 579 | $value1 = $mdref1->{$key};
|
|---|
| 580 | }
|
|---|
| 581 | # Now add the value(s) from the second array to the first
|
|---|
| 582 | $value2 = &clonedata($value2);
|
|---|
| 583 | push @$value1, @$value2;
|
|---|
| 584 | }
|
|---|
| 585 | # Finally, If the second structure is not an array erference, we
|
|---|
| 586 | # know it is in override mode, so override the first structure.
|
|---|
| 587 | else {
|
|---|
| 588 | $mdref1->{$key} = &clonedata($value2);
|
|---|
| 589 | }
|
|---|
| 590 | }
|
|---|
| 591 | }
|
|---|
| 592 |
|
|---|
| 593 |
|
|---|
| 594 | # Make a "cloned" copy of a metadata value.
|
|---|
| 595 | # This is trivial for a simple scalar value,
|
|---|
| 596 | # but not for an array reference.
|
|---|
| 597 |
|
|---|
| 598 | sub clonedata {
|
|---|
| 599 | my ($value) = @_;
|
|---|
| 600 | my $result;
|
|---|
| 601 |
|
|---|
| 602 | if ((ref $value) eq 'ARRAY') {
|
|---|
| 603 | $result = [];
|
|---|
| 604 | foreach my $item (@$value) {
|
|---|
| 605 | push @$result, $item;
|
|---|
| 606 | }
|
|---|
| 607 | } else {
|
|---|
| 608 | $result = $value;
|
|---|
| 609 | }
|
|---|
| 610 | return $result;
|
|---|
| 611 | }
|
|---|
| 612 |
|
|---|
| 613 |
|
|---|
| 614 | 1;
|
|---|
