RDF::Query::Algebra::TimeGraph - Algebra class for temporal patterns
Index
Code Index:
NAME
RDF::Query::Algebra::TimeGraph - Algebra class for temporal patterns
VERSION
This document describes RDF::Query::Algebra::TimeGraph version 2.907.
METHODS
Beyond the methods documented below, this class inherits methods from the
RDF::Query::Algebra class.
new ( $interval, $pattern, $time_triples )-
Returns a new TimeGraph structure.
construct_args-
Returns a list of arguments that, passed to this class' constructor,
will produce a clone of this algebra pattern.
interval-
Returns the time interval node of the temporal graph expression.
pattern-
Returns the graph pattern of the temporal graph expression.
time_triples-
Returns the triples describing the time interval of the temporal graph.
sse-
Returns the SSE string for this algebra expression.
as_sparql-
Returns the SPARQL string for this algebra expression.
type-
Returns the type of this algebra expression.
referenced_variables-
Returns a list of the variable names used in this algebra expression.
potentially_bound-
Returns a list of the variable names used in this algebra expression that will
bind values during execution.
definite_variables-
Returns a list of the variable names that will be bound after evaluating this algebra expression.
AUTHOR
Gregory Todd Williams <gwilliams@cpan.org>
# RDF::Query::Algebra::TimeGraph
# -----------------------------------------------------------------------------
package RDF::Query::Algebra::TimeGraph;
use strict;
use warnings;
no warnings 'redefine';
use base qw(RDF::Query::Algebra);
use Data::Dumper;
use Carp qw(carp croak confess);
######################################################################
our ($VERSION);
BEGIN {
$VERSION = '2.907';
}
######################################################################
sub new {
my $class = shift;
my @data = @_; # $interval, $pattern, $triples
return bless( [ 'TIME', @data ], $class );
}
sub construct_args {
my $self = shift;
return ($self->interval, $self->pattern, $self->time_triples);
}
sub interval {
my $self = shift;
if (@_) {
my $interval = shift;
$self->[1] = $interval;
}
return $self->[1];
}
sub pattern {
my $self = shift;
return $self->[2];
}
sub time_triples {
my $self = shift;
return $self->[3];
}
sub sse {
my $self = shift;
my $context = shift;
my $prefix = shift || '';
my $indent = $context->{indent};
return sprintf(
'(time\n${prefix}${indent}%s\n${prefix}${indent}%s\n${prefix}${indent}%s)',
$self->interval->sse( $context, "${prefix}${indent}" ),
$self->pattern->sse( $context, "${prefix}${indent}" ),
$self->time_triples->sse( $context, "${prefix}${indent}" ),
);
}
sub as_sparql {
my $self = shift;
my $context = shift;
my $indent = shift;
my $nindent = $indent . "\t";
my $string = sprintf(
"TIME %s %s",
$self->interval->as_sparql( $context, $indent ),
$self->pattern->as_sparql( $context, $indent ),
);
return $string;
}
sub type {
return 'TIME';
}
sub referenced_variables {
my $self = shift;
return RDF::Query::_uniq(
map { $_->name } grep { $_->isa('RDF::Query::Node::Variable') } ($self->graph),
$self->pattern->referenced_variables,
$self->time_triples->referenced_variables,
);
}
sub potentially_bound {
my $self = shift;
return RDF::Query::_uniq(
map { $_->name } grep { $_->isa('RDF::Query::Node::Variable') } ($self->graph),
$self->pattern->potentially_bound,
$self->time_triples->potentially_bound,
);
}
sub definite_variables {
my $self = shift;
return RDF::Query::_uniq(
map { $_->name } grep { $_->isa('RDF::Query::Node::Variable') } ($self->graph),
$self->pattern->definite_variables,
$self->time_triples->definite_variables,
);
}
1;
__END__