class SPARQL::Algebra::Operator::Equal
The SPARQL
relational `=` (equal) comparison operator.
@example
(= ?x ?y)
@see www.w3.org/TR/sparql11-query/#OperatorMapping @see www.w3.org/TR/sparql11-query/#func-RDFterm-equal
Constants
- NAME
Public Instance Methods
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#==
# File lib/sparql/algebra/operator/equal.rb, line 29 def apply(term1, term2, **options) term1 = term1.dup.extend(RDF::TypeCheck) term2 = term2.dup.extend(RDF::TypeCheck) RDF::Literal(term1 == term2) end