/usr/share/perl5/RDF/Query/Expression/Alias.pm is in librdf-query-perl 2.918-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | # RDF::Query::Expression::Alias
# -----------------------------------------------------------------------------
=head1 NAME
RDF::Query::Expression::Alias - Class for aliasing expressions with variable names
=head1 VERSION
This document describes RDF::Query::Expression::Alias version 2.918.
=cut
package RDF::Query::Expression::Alias;
use strict;
use warnings;
no warnings 'redefine';
use base qw(RDF::Query::Expression);
use Data::Dumper;
use Scalar::Util qw(blessed);
use Carp qw(carp croak confess);
######################################################################
our ($VERSION);
BEGIN {
$VERSION = '2.918';
}
######################################################################
=head1 METHODS
Beyond the methods documented below, this class inherits methods from the
L<RDF::Query::Expression> class.
=over 4
=cut
=item C<< name >>
Returns the variable name of the aliased expression.
=cut
sub name {
my $self = shift;
return $self->alias->name;
}
=item C<< alias >>
Returns the variable object of the aliased expression.
=cut
sub alias {
my $self = shift;
my ($alias) = $self->operands;
return $alias;
}
=item C<< expression >>
Returns the expression object of the aliased expression.
=cut
sub expression {
my $self = shift;
return ($self->operands)[1];
}
=item C<< sse >>
Returns the SSE string for this algebra expression.
=cut
sub sse {
my $self = shift;
my $context = shift;
return sprintf(
'(alias ?%s %s)',
$self->name,
$self->expression->sse( $context ),
);
}
=item C<< as_sparql >>
Returns the SPARQL string for this algebra expression.
=cut
sub as_sparql {
my $self = shift;
my $context = shift;
my $indent = shift;
my $alias = $self->alias;
my $expr = $self->expression;
return sprintf("(%s AS %s)", $expr->as_sparql, $alias->as_sparql);
}
=item C<< evaluate ( $query, \%bound, $context ) >>
Evaluates the expression using the supplied bound variables.
Will return a RDF::Query::Node object.
=cut
sub evaluate {
my $self = shift;
my $query = shift;
my $bound = shift;
my $ctx = shift;
my $expr = $self->expression;
my $value = $query->var_or_expr_value( $bound, $expr, $ctx );
return $value;
}
=item C<< as_hash >>
Returns the alias as a nested set of plain data structures (no objects).
=cut
sub as_hash {
my $self = shift;
my $context = shift;
return {
type => 'alias',
alias => $self->alias->as_hash,
expression => $self->expression->as_hash,
};
}
1;
__END__
=back
=head1 AUTHOR
Gregory Todd Williams <gwilliams@cpan.org>
=cut
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