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

Inherits:

Equal

• Object
• SPARQL::Algebra::Operator
• Binary
• Compare
• Equal
• SPARQL::Algebra::Operator::NotEqual

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:

• https://www.w3.org/TR/sparql11-query/#OperatorMapping
• https://www.w3.org/TR/sparql11-query/#func-RDFterm-equal

Constant Summary

NAME =

:'!='

Constants inherited from Binary

Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI, URI

Constants included from Expression

Expression::PATTERN_PARENTS

Instance Attribute Summary

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary

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

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

Methods inherited from Compare

#to_sparql

Methods included from Evaluatable

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

Methods inherited from Binary

#initialize

Methods inherited from SPARQL::Algebra::Operator

#aggregate?, arity, #base_uri, base_uri, base_uri=, #bind, #boolean, #constant?, #deep_dup, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, to_sparql, #to_sparql, #to_sxp, #to_sxp_bin, #validate!, #variable?, #variables, #vars

Methods included from Expression

cast, #constant?, #evaluate, extension, extension?, extensions, for, #invalid?, new, #node?, open, #optimize, #optimize!, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?

Constructor Details

This class inherits a constructor from SPARQL::Algebra::Operator::Binary

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:

• term1 (RDF::Term) —

  an RDF term

• term2 (RDF::Term) —

  an RDF term

Returns:

• (RDF::Literal::Boolean) —

  true or false

Raises:

• (TypeError) —

  if either operand is not an RDF term

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

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