/usr/share/perl5/RDF/Trine/Node/Nil.pm is in librdf-trine-perl 1.007-2.
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
RDF::Trine::Node::Nil - RDF Node class for the nil node
=head1 VERSION
This document describes RDF::Trine::Node::Nil version 1.007
=cut
package RDF::Trine::Node::Nil;
use strict;
use warnings;
no warnings 'redefine';
use base qw(RDF::Trine::Node);
use Data::Dumper;
use Scalar::Util qw(blessed refaddr);
use Carp qw(carp croak confess);
######################################################################
my $NIL_NODE;
our ($VERSION);
BEGIN {
$VERSION = '1.007';
}
######################################################################
use overload '""' => sub { $_[0]->sse },
;
=head1 METHODS
Beyond the methods documented below, this class inherits methods from the
L<RDF::Trine::Node> class.
=over 4
=cut
=item C<< new () >>
Returns the nil-valued node.
=cut
sub new {
my $class = shift;
if (blessed($NIL_NODE)) {
return $NIL_NODE;
} else {
$NIL_NODE = bless({}, $class);
return $NIL_NODE;
}
}
=item C<< is_nil >>
Returns true if this object is the nil-valued node.
=cut
sub is_nil {
my $self = shift;
return (refaddr($self) == refaddr($NIL_NODE));
}
=item C<< sse >>
Returns the SSE string for this nil node.
=cut
sub sse {
my $self = shift;
return '(nil)';
}
=item C<< as_ntriples >>
Returns the N-Triples serialization of the nil node's IRI
<tag:gwilliams@cpan.org,2010-01-01:RT:NIL>.
=cut
sub as_ntriples {
my $self = shift;
return sprintf('<%s>', &RDF::Trine::NIL_GRAPH());
}
=item C<< type >>
Returns the type string of this node.
=cut
sub type {
return 'NIL';
}
=item C<< value >>
Returns the empty string.
=cut
sub value {
my $self = shift;
return '';
}
=item C<< equal ( $node ) >>
Returns true if the two nodes are equal, false otherwise.
=cut
sub equal {
my $self = shift;
my $node = shift;
return 0 unless (blessed($node));
if ($self->isa('RDF::Trine::Node::Nil') and $node->isa('RDF::Trine::Node::Nil')) {
return 1;
} else {
return 0;
}
}
# called to compare two nodes of the same type
sub _compare {
return 0;
}
1;
__END__
=back
=head1 BUGS
Please report any bugs or feature requests to through the GitHub web interface
at L<https://github.com/kasei/perlrdf/issues>.
=head1 AUTHOR
Gregory Todd Williams C<< <gwilliams@cpan.org> >>
=head1 COPYRIGHT
Copyright (c) 2006-2012 Gregory Todd Williams. This
program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=cut
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