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module SPARQL; module Algebra
class Operator
##
# The SPARQL relational `!=` (not equal) comparison operator.
#
# [114] RelationalExpression ::= NumericExpression ('!=' NumericExpression)?
#
# @example SPARQL Grammar
# PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
# PREFIX : <http://example.org/things#>
# SELECT ?x
# WHERE { ?x :p ?v . FILTER ( ?v != 1 ) }
#
# @example SSE
# (prefix
# ((xsd: <http://www.w3.org/2001/XMLSchema#>) (: <http://example.org/things#>))
# (project (?x) (filter (!= ?v 1) (bgp (triple ?x :p ?v)))))
#
# @see https://www.w3.org/TR/sparql11-query/#OperatorMapping
# @see https://www.w3.org/TR/sparql11-query/#func-RDFterm-equal
class NotEqual < Equal
NAME = :'!='
##
# Returns `true` if the operands are not equal; returns `false`
# otherwise.
#
# Comparing unknown datatypes might have different lexical forms but be the same value.
#
# @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
def apply(term1, term2, **options)
RDF::Literal(super.false?)
end
end # NotEqual
end # Operator
end; end # SPARQL::Algebra
Version data entries
8 entries across 8 versions & 1 rubygems