Class: SPARQL::Algebra::Operator::Not

Inherits:

Unary

• Object
• SPARQL::Algebra::Operator
• Unary
• SPARQL::Algebra::Operator::Not

show all

Includes:

Evaluatable

Defined in:

lib/sparql/algebra/operator/not.rb

Overview

(! ?x ?y)
(not ?x ?y)

Constant Summary

NAME =

[:not, :!']

Constants inherited from Unary

Unary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY

Instance Attribute Summary

Attributes inherited from SPARQL::Algebra::Operator

#operands, #options

Instance Method Summary (collapse)

• - (RDF::Literal::Boolean) apply(operand)

  Returns the logical NOT (inverse) of the operand.

Methods included from Evaluatable

#evaluate, #memoize

Methods inherited from Unary

#initialize

Methods inherited from SPARQL::Algebra::Operator

arity, base_uri, #base_uri, base_uri=, #boolean, #constant?, #eql?, #evaluatable?, evaluate, #executable?, for, #initialize, #inspect, #operand, #optimize, prefixes, #prefixes, prefixes=, #to_sse, #to_sxp, #variable?

Methods included from Expression

cast, #constant?, #evaluate, for, new, open, #optimize, parse, #to_sse, #variable?

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# File 'lib/sparql/algebra/operator/not.rb', line 26

def apply(operand)
  case bool = boolean(operand)
    when RDF::Literal::Boolean
      RDF::Literal(bool.false?)
    else super
  end
end