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module SPARQL; module Algebra class Operator ## # The SPARQL `sameTerm` operator. # # @example # (prefix ((xsd: <http://www.w3.org/2001/XMLSchema#>) # (: <http://example.org/things#>)) # (project (?x ?v) # (filter (sameTerm ?v) # (bgp (triple ?x :p ?v))))) # # @see http://www.w3.org/TR/rdf-sparql-query/#func-sameTerm class SameTerm < Operator::Binary include Evaluatable NAME = :sameTerm ## # Returns `true` if the operands are the same RDF term; returns # `false` otherwise. # # @param [RDF::Term] term1 # an RDF term # @param [RDF::Term] term2 # an RDF term # @return [RDF::Literal::Boolean] `true` or `false` # @raise [TypeError] if either operand is unbound def apply(term1, term2) RDF::Literal(term1.eql?(term2)) end ## # Returns an optimized version of this expression. # # @return [SPARQL::Algebra::Expression] def optimize if operand(0).is_a?(Variable) && operand(0).eql?(operand(1)) RDF::Literal::TRUE else super # @see Operator#optimize end end end # SameTerm end # Operator end; end # SPARQL::Algebra
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31 entries across 31 versions & 1 rubygems