NAME

RDF::Query::Algebra::Service - Algebra class for SERVICE (federation) patterns

VERSION

This document describes RDF::Query::Algebra::Service version 2.200, released 6 August 2009.

METHODS

new ( $endpoint, $pattern )

Returns a new Service structure.

construct_args

Returns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern.

endpoint

Returns the endpoint resource of the named graph expression.

pattern

Returns the graph pattern of the named graph expression.

add_bloom ( $variable, $filter )

Adds a FILTER to the enclosed GroupGraphPattern to restrict values of the named $variable to the values encoded in the $filter (a Bloom::Filter object).

sse

Returns the SSE string for this alegbra expression.

as_sparql

Returns the SPARQL string for this alegbra expression.

type

Returns the type of this algebra expression.

referenced_variables

Returns a list of the variable names used in this algebra expression.

definite_variables

Returns a list of the variable names that will be bound after evaluating this algebra expression.

qualify_uris ( \%namespaces, $base )

Returns a new algebra pattern where all referenced Resource nodes representing QNames (ns:local) are qualified using the supplied %namespaces.

fixup ( $query, $bridge, $base, \%namespaces )

Returns a new pattern that is ready for execution using the given bridge. This method replaces generic node objects with bridge-native objects.

execute ( $query, $bridge, \%bound, $context, %args )

bloom_filter_for_iterator ( $query, $bridge, $bound, $iterator, $variable, $error )

Returns a Bloom::Filter object containing the Resource and Literal values that are bound to $variable in the $iterator's data.

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>