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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `not` operator.
#
# @example
# (! ?x ?y)
# (not ?x ?y)
#
# @see http://www.w3.org/TR/xpath-functions/#func-not
class Not < Operator::Unary
include Evaluatable
NAME = [:not, :'!']
##
# 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
def apply(operand)
case bool = boolean(operand)
when RDF::Literal::Boolean
RDF::Literal(bool.false?)
else super
end
end
end # Not
end # Operator
end; end # SPARQL::Algebra
Version data entries
11 entries across 11 versions & 1 rubygems