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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL Property Path `path` operator.
#
# @example
# (path :a (path+ :p) ?z)
#
# @see http://www.w3.org/TR/sparql11-query/#sparqlTranslatePathExpressions
class Path < Operator::Ternary
include Query
NAME = :path
##
# Finds solutions from `queryable` matching the path.
#
# @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 http://www.w3.org/TR/sparql11-query/#sparqlAlgebra
def execute(queryable, options = {}, &block)
debug(options) {"Path #{operands.to_sse}"}
subject, path_op, object = operands
@solutions = RDF::Query::Solutions.new
path_op.execute(queryable, options.merge(
subject: subject,
object: object,
graph_name: options.fetch(:graph_name, false),
depth: options[:depth].to_i + 1)
) do |solution|
@solutions << solution
end
debug(options) {"=> #{@solutions.inspect}"}
@solutions.uniq!
@solutions.each(&block) if block_given?
@solutions
end
end # Path
end # Operator
end; end # SPARQL::Algebra
Version data entries
10 entries across 10 versions & 1 rubygems