class SPARQL::Algebra::Operator::Not
The SPARQL
logical `not` operator.
@example
(! ?x) (not ?x)
Constants
- NAME
Public Instance Methods
apply(operand, **options)
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Returns the logical `NOT` (inverse) of the operand.
Note that this operator operates on the effective boolean value (EBV) of its operand.
@param [RDF::Literal::Boolean] operand
the operand
@return [RDF::Literal::Boolean] `true` or `false` @raise [TypeError] if the operand could not be coerced to a boolean literal
Calls superclass method
SPARQL::Algebra::Evaluatable#apply
# File lib/sparql/algebra/operator/not.rb, line 26 def apply(operand, **options) case bool = boolean(operand) when RDF::Literal::Boolean RDF::Literal(bool.false?) else super end end