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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL GraphPattern `project` operator.
#
# @example
# (select (?v)
# (project (?v)
# (filter (= ?v 2)
# (bgp (triple ?s <http://example/p> ?v)))))
#
# @see https://www.w3.org/TR/sparql11-query/#modProjection
class Project < Operator::Binary
include Query
NAME = [:project]
##
# Executes this query on the given `queryable` graph or repository.
# Reduces the result set to the variables listed in the first operand
#
# @param [RDF::Queryable] queryable
# the graph or repository to query
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @yield [solution]
# each matching solution
# @yieldparam [RDF::Query::Solution] solution
# @yieldreturn [void] ignored
# @return [RDF::Query::Solutions]
# the resulting solution sequence
# @see https://www.w3.org/TR/sparql11-query/#sparqlAlgebra
def execute(queryable, **options, &block)
@solutions = queryable.query(operands.last, depth: options[:depth].to_i + 1, **options)
@solutions = @solutions.project(*(operands.first))
@solutions.each(&block) if block_given?
@solutions
end
end # Project
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems