Class: SPARQL::Algebra::Operator::NotEqual

Inherits:
Equal show all
Defined in:
lib/sparql/algebra/operator/not_equal.rb

Overview

The SPARQL relational != (not equal) comparison operator.

[114] RelationalExpression ::= NumericExpression ('!=' NumericExpression)?

Examples:

SPARQL Grammar

PREFIX  xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX  : <http://example.org/things#>
SELECT  ?x
WHERE { ?x :p ?v . FILTER ( ?v != 1 ) }

SSE

(prefix
 ((xsd: <http://www.w3.org/2001/XMLSchema#>) (: <http://example.org/things#>))
 (project (?x) (filter (!= ?v 1) (bgp (triple ?x :p ?v)))))

See Also:

Constant Summary collapse

NAME = 
:'!='

Instance Method Summary collapse

Methods inherited from Compare

#to_sparql

Methods included from Evaluatable

#evaluate, #memoize, #replace_aggregate!, #replace_vars!

Instance Method Details

#apply(term1, term2, **options) ⇒ RDF::Literal::Boolean

Returns true if the operands are not equal; returns false otherwise.

Comparing unknown datatypes might have different lexical forms but be the same value.

Parameters:

Returns:

  • (RDF::Literal::Boolean) —

    true or false

Raises:

  • (TypeError) —

    if either operand is not an RDF term



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# File 'lib/sparql/algebra/operator/not_equal.rb', line 36

def apply(term1, term2, **options)
  RDF::Literal(super.false?)
end