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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 https://www.w3.org/TR/sparql11-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 true if variable operand1 is a bound variable and equals operand2
#
# @return [SameTerm] a copy of `self`
# @see SPARQL::Algebra::Expression#optimize
def optimize(**options)
if operand(0).is_a?(Variable) && operand(0).bound? && operand(0).eql?(operand(1))
RDF::Literal::TRUE
else
super # @see Operator#optimize!
end
end
end # SameTerm
end # Operator
end; end # SPARQL::Algebra
Version data entries
5 entries across 5 versions & 1 rubygems