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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL GraphPattern `base` operator.
#
# @example
# (base <http://example.org/>
# (bgp (triple <a> <b> 123.0)))
#
# @see https://www.w3.org/TR/sparql11-query/#QSynIRI
class Base < Binary
include Query
NAME = [:base]
##
# Executes this query on the given `queryable` graph or repository.
# Really a pass-through, as this is a syntactic object used for providing
# context for relative URIs.
#
# @param [RDF::Queryable] queryable
# the graph or repository to query
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @yield [solution]
# each matching solution, statement or boolean
# @yieldparam [RDF::Statement, RDF::Query::Solution, Boolean] solution
# @yieldreturn [void] ignored
# @return [RDF::Queryable, RDF::Query::Solutions]
# the resulting solution sequence
# @see https://www.w3.org/TR/sparql11-query/#sparqlAlgebra
def execute(queryable, **options, &block)
debug(options) {"Base #{operands.first}"}
Operator.base_uri = operands.first
queryable.query(operands.last, depth: options[:depth].to_i + 1, **options, &block)
end
##
# Return optimized query
#
# @return [Base] a copy of `self`
# @see SPARQL::Algebra::Expression#optimize
def optimize(**options)
Operator.base_uri = operands.first
operands.last.optimize(**options)
end
# Query results in a boolean result (e.g., ASK)
# @return [Boolean]
def query_yields_boolean?
operands.last.query_yields_boolean?
end
# Query results statements (e.g., CONSTRUCT, DESCRIBE, CREATE)
# @return [Boolean]
def query_yields_statements?
operands.last.query_yields_statements?
end
end # Base
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems