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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL Property Path `notoneof` (NegatedPropertySet) operator.
#
# @example
# (notoneof ex:p1 ex:p2)
#
# @see http://www.w3.org/TR/sparql11-query/#eval_negatedPropertySet
class NotOneOf < Operator
include Query
NAME = :notoneof
##
# Equivalant to:
#
# (path (:x (noteoneof :p :q) :y))
# => (filter (notin ??p :p :q) (bgp (:x ??p :y)))
#
# @note all operands are terms, and not operators, so this can be done by filtering results usin
#
# @param [RDF::Queryable] queryable
# the graph or repository to query
# @param [Hash{Symbol => Object}] options
# any additional keyword options
# @option options [RDF::Term, RDF::Variable] :subject
# @option options [RDF::Term, RDF::Variable] :object
# @yield [solution]
# each matching solution
# @yieldparam [RDF::Query::Solution] solution
# @yieldreturn [void] ignored
# @see http://www.w3.org/TR/rdf-sparql-query/#sparqlAlgebra
def execute(queryable, options = {}, &block)
debug(options) {"NotOneOf #{operands.to_sse}"}
subject, object = options[:subject], options[:object]
v = RDF::Query::Variable.new
v.distinguished = false
bgp = RDF::Query.new do |q|
q.pattern [subject, v, object]
end
query = Filter.new(NotIn.new(v, *operands), bgp)
queryable.query(query, options.merge(depth: options[:depth].to_i + 1)) do |solution|
solution.bindings.delete(v.to_sym)
debug(options) {"(solution)-> #{solution.to_hash.to_sse}"}
block.call(solution)
end
end
end # NotOneOf
end # Operator
end; end # SPARQL::Algebra
Version data entries
6 entries across 6 versions & 1 rubygems