/usr/share/perl5/RDF/Query/Node/Blank.pm is in librdf-query-perl 2.916-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | # RDF::Query::Node::Blank
# -----------------------------------------------------------------------------
=head1 NAME
RDF::Query::Node::Blank - RDF Node class for blank nodes
=head1 VERSION
This document describes RDF::Query::Node::Blank version 2.916.
=head1 METHODS
Beyond the methods documented below, this class inherits methods from the
L<RDF::Query::Node> and L<RDF::Trine::Node::Blank> classes.
=over 4
=cut
package RDF::Query::Node::Blank;
use strict;
use warnings;
no warnings 'redefine';
use base qw(RDF::Query::Node RDF::Trine::Node::Blank);
use Data::Dumper;
use Scalar::Util qw(blessed);
use Carp qw(carp croak confess);
######################################################################
our ($VERSION);
BEGIN {
$VERSION = '2.916';
}
######################################################################
use overload '<=>' => \&_cmp,
'cmp' => \&_cmp,
'<' => sub { _cmp(@_[0,1]) == -1 },
'>' => sub { _cmp(@_[0,1]) == 1 },
'!=' => sub { _cmp(@_[0,1]) != 0 },
'==' => sub { _cmp(@_[0,1]) == 0 },
'+' => sub { $_[0] },
'""' => sub { $_[0]->sse },
;
sub _cmp {
my $nodea = shift;
my $nodeb = shift;
my $l = Log::Log4perl->get_logger("rdf.query.node.blank");
$l->debug("blank comparison: " . Dumper($nodea, $nodeb));
return 1 unless blessed($nodeb);
return -1 if ($nodeb->isa('RDF::Trine::Node::Nil'));
return -1 if ($nodeb->isa('RDF::Query::Node::Literal'));
return -1 if ($nodeb->isa('RDF::Query::Node::Resource'));
return 1 unless ($nodeb->isa('RDF::Query::Node::Blank'));
my $cmp = $nodea->blank_identifier cmp $nodeb->blank_identifier;
$l->debug("-> $cmp");
return $cmp;
}
=item C<< new ( [ $name ] ) >>
Returns a new Blank node object. If C<< $name >> is supplied, it will be used as
the blank node identifier. Otherwise a time-based identifier will be generated
and used.
=cut
sub new {
my $class = shift;
my $name = shift;
unless (defined($name)) {
$name = 'r' . time() . 'r' . $RDF::Trine::Node::Blank::COUNTER++;
}
return $class->_new( $name );
}
=item C<< as_sparql >>
Returns the SPARQL string for this node.
=cut
sub as_sparql {
my $self = shift;
return $self->sse;
}
=item C<< as_hash >>
Returns the query as a nested set of plain data structures (no objects).
=cut
sub as_hash {
my $self = shift;
my $context = shift;
return {
type => 'node',
blank => $self->blank_identifier,
};
}
=item C<< make_distinguished_variable >>
Returns a new variable based on this blank node.
=cut
sub make_distinguished_variable {
my $self = shift;
my $id = $self->blank_identifier;
my $name = '__ndv_' . $id;
my $var = RDF::Query::Node::Variable->new( $name );
return $var;
}
1;
__END__
=back
=head1 AUTHOR
Gregory Todd Williams <gwilliams@cpan.org>
=cut
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