/usr/share/perl5/DublinCore/Record.pm is in libdublincore-record-perl 0.03-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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=head1 NAME
DublinCore::Record - Container for Dublin Core metadata elements
=head1 SYNOPSIS
use DublinCore::Record;
my $record = DublinCore::Record->new();
# later ...
# print the title
print $record->element( 'title' )->content;
## list context will retrieve all of a particular element
foreach my $element ( $record->element( 'Creator' ) ) {
print "creator: ", $element->content(), "\n";
}
## qualified dublin core
my $creation = $record->element( 'Date.created' )->content();
=head1 DESCRIPTION
DublinCore::Record is an abstract class for manipulating DublinCore metadata.
The Dublin Core is a small set of metadata elements for describing information
resources. For more information on embedding DublinCore in HTML see RFC 2731
L<http://www.ietf.org/rfc/rfc2731> or L<http://www.dublincore.org/documents/dces/>
=cut
use strict;
use warnings;
use Carp qw( croak );
use DublinCore::Element;
our $VERSION = '0.03';
our @VALID_ELEMENTS = qw(
title
creator
subject
description
publisher
contributor
date
type
format
identifier
source
language
relation
coverage
rights
);
=head1 METHODS
=head2 new()
The constructor. Takes no arguments.
$record = DublinCore::Record->new();
=cut
sub new {
my $class = shift;
my $self = {};
$self->{ "DC_$_" } = [] for @VALID_ELEMENTS;
bless $self, $class;
$self->add( @_ );
return $self;
}
=head2 add( @elements )
Adds valid DublinCore::Element objects to the record.
=cut
sub add {
my $self = shift;
for my $element ( @_ ) {
push @{ $self->{ 'DC_' . lc( $element->name ) } }, $element;
}
}
=head2 remove( @elements )
Removes valid DublinCore::Element object from the record.
=cut
sub remove {
my $self = shift;
for my $element ( @_ ) {
my $name = 'DC_' . lc( $element->name );
$self->{ $name } = [
grep { $element ne $_ } @{ $self->{ $name } }
];
}
}
=head2 element()
This method will return a relevant DublinCore::Element object. When
called in a scalar context element() will return the first relevant element
found, and when called in a list context it will return all the relevant
elements (since Dublin Core elements are repeatable).
## retrieve first title element
my $element = $record->element( 'Title' );
my $title = $element->content();
## shorthand object chaining to extract element content
my $title = $record->element( 'Title' )->content();
## retrieve all creator elements
@creators = $record->element( 'Creator' );
You can also retrieve qualified elements in a similar fashion.
my $date = $record->element( 'Date.created' )->content();
In order to fascilitate chaining element() will return an empty
DublinCore::Element object when the requested element does not
exist. You can check if you're getting an empty empty back by using
the is_empty() method.
if( $record->element( 'title' )->is_empty ) {
# no title
}
=cut
sub element {
my ( $self, $name ) = @_;
$name = lc( $name );
## must be a valid DC element (with additional qualifier)
croak( "invalid Dublin Core element: $name" )
if ! grep { $name =~ /^$_/ } @VALID_ELEMENTS;
## extract qualifier if present
my $qualifier;
( $name, $qualifier ) = split /\./, $name;
my @elements = ();
foreach my $element ( @{ $self->{ "DC_$name" } } ) {
if ( $qualifier and $element->qualifier() =~ /$qualifier/i ) {
push( @elements, $element );
} elsif ( !$qualifier ) {
push( @elements, $element );
}
}
if ( wantarray ) { return @elements };
return( $elements[ 0 ] ) if $elements[ 0 ];
## otherwise return an empty element object to fascilitate
## chaining when the element doesn't exist :
## $dc->element( 'Title' )->content().
return( DublinCore::Element->new() );
}
=head2 elements()
Returns all the Dublin Core elements found as DublinCore::Element
objects which you can then manipulate further.
foreach my $element ( $record->elements() ) {
print "name=", $element->name(), "\n";
print "content=", $element->content(), "\n";
}
=cut
sub elements {
my $self = shift;
my @elements = ();
foreach my $type ( @VALID_ELEMENTS ) {
push( @elements, @{ $self->{ "DC_$type" } } );
}
return( @elements );
}
=head2 title()
Returns a DublinCore::Element object for the title element. You can then
retrieve content, qualifier, scheme, lang attributes like so.
my $title = $record->title();
print "content: ", $title->content(), "\n";
print "qualifier: ", $title->qualifier(), "\n";
print "scheme: ", $title->scheme(), "\n";
print "language: ", $title->language(), "\n";
Since there can be multiple instances of a particular element type (title,
creator, subject, etc) you can retrieve multiple title elements by calling
title() in a list context.
my @titles = $record->title();
foreach my $title ( @titles ) {
print "title: ", $title->content(), "\n";
}
=cut
sub title {
my $self = shift;
return( $self->_getElement( 'title', wantarray ) );
}
=head2 creator()
Retrieve creator information in the same manner as title().
=cut
sub creator {
my $self = shift;
return( $self->_getElement( 'creator', wantarray ) );
}
=head2 subject()
Retrieve subject information in the same manner as title().
=cut
sub subject {
my $self = shift;
return( $self->_getElement( 'subject', wantarray ) );
}
=head2 description()
Retrieve description information in the same manner as title().
=cut
sub description {
my $self = shift;
return( $self->_getElement( 'description', wantarray ) );
}
=head2 publisher()
Retrieve publisher information in the same manner as title().
=cut
sub publisher {
my $self = shift;
return( $self->_getElement( 'publisher', wantarray ) );
}
=head2 contributor()
Retrieve contributor information in the same manner as title().
=cut
sub contributor {
my $self = shift;
return( $self->_getElement( 'contributor', wantarray ) );
}
=head2 date()
Retrieve date information in the same manner as title().
=cut
sub date {
my $self = shift;
return( $self->_getElement( 'date', wantarray ) );
}
=head2 type()
Retrieve type information in the same manner as title().
=cut
sub type {
my $self = shift;
return( $self->_getElement( 'type', wantarray ) );
}
=head2 format()
Retrieve format information in the same manner as title().
=cut
sub format {
my $self = shift;
return( $self->_getElement( 'format', wantarray ) );
}
=head2 identifier()
Retrieve identifier information in the same manner as title().
=cut
sub identifier {
my $self = shift;
return( $self->_getElement( 'identifier', wantarray ) );
}
=head2 source()
Retrieve source information in the same manner as title().
=cut
sub source {
my $self = shift;
return( $self->_getElement( 'source', wantarray ) );
}
=head2 language()
Retrieve language information in the same manner as title().
=cut
sub language {
my $self = shift;
return( $self->_getElement( 'language', wantarray ) );
}
=head2 relation()
Retrieve relation information in the same manner as title().
=cut
sub relation {
my $self = shift;
return( $self->_getElement( 'relation', wantarray ) );
}
=head2 coverage()
Retrieve coverage information in the same manner as title().
=cut
sub coverage {
my $self = shift;
return( $self->_getElement( 'coverage', wantarray ) );
}
=head2 rights()
Retrieve rights information in the same manner as title().
=cut
sub rights {
my $self = shift;
return( $self->_getElement( 'rights', wantarray ) );
}
sub _getElement {
my ( $self, $element, $wantarray ) = @_;
my $contents = $self->{ "DC_$element" };
if ( $wantarray ) {
return( @$contents );
}
elsif ( scalar( @$contents ) > 0 ) {
return( $contents->[ 0 ] );
}
return DublinCore::Element->new();
}
=head1 SEE ALSO
=over 4
=item * DublinCore::Element
=item * Dublin Core L<http://www.dublincore.org/>
=item * RFC 2731 L<http://www.ietf.org/rfc/rfc2731>
=item * perl4lib L<http://www.rice.edu/perl4lib>
=back
=head1 AUTHOR
=over 4
=item * Ed Summers E<lt>ehs@pobox.comE<gt>
=item * Brian Cassidy E<lt>bricas@cpan.orgE<gt>
=back
=head1 COPYRIGHT AND LICENSE
Copyright 2007 by Ed Summers, Brian Cassidy
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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