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module SPARQL; module Algebra
class Operator
##
# The SPARQL relational `=` (equal) comparison operator.
#
# @example
# (= ?x ?y)
#
# @see https://www.w3.org/TR/sparql11-query/#OperatorMapping
# @see https://www.w3.org/TR/sparql11-query/#func-RDFterm-equal
class Equal < Compare
NAME = :'='
##
# Returns TRUE if `term1` and `term2` are the same RDF term as defined in Resource Description Framework (RDF): Concepts and Abstract Syntax [CONCEPTS]; produces a type error if the arguments are both literal but are not the same RDF term *; returns FALSE otherwise. `term1` and `term2` are the same if any of the following is true:
#
# * term1 and term2 are equivalent IRIs as defined in 6.4 RDF URI References of [CONCEPTS].
# * term1 and term2 are equivalent literals as defined in 6.5.1 Literal Equality of [CONCEPTS].
# * term1 and term2 are the same blank node as described in 6.6 Blank Nodes of [CONCEPTS].
#
# @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 not an RDF term or operands are not comperable
#
# @see RDF::Term#==
def apply(term1, term2)
term1 = term1.dup.extend(RDF::TypeCheck)
term2 = term2.dup.extend(RDF::TypeCheck)
RDF::Literal(term1 == term2)
end
end # Equal
end # Operator
end; end # SPARQL::Algebra
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5 entries across 5 versions & 1 rubygems