Class: SPARQL::Algebra::Operator::LessThan

Inherits:

Compare

• Object
• Operator::Binary
• Compare
• SPARQL::Algebra::Operator::LessThan

Defined in:

lib/sparql/algebra/operator/less_than.rb

Overview

The SPARQL relational < (less than) 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/xpath-functions/#func-compare
• https://www.w3.org/TR/xpath-functions/#func-numeric-less-than
• https://www.w3.org/TR/xpath-functions/#func-boolean-less-than
• https://www.w3.org/TR/xpath-functions/#func-dateTime-less-than

Constant Summary

NAME =

:<

Instance Method Summary

• #apply(left, right, **options) ⇒ RDF::Literal::Boolean

  Returns true if the first operand is less than the second operand; returns false otherwise.

Methods inherited from Compare

#to_sparql

Methods included from Evaluatable

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

Instance Method Details

#apply(left, right, **options) ⇒ RDF::Literal::Boolean

Returns true if the first operand is less than the second operand; returns false otherwise.

Parameters:

• left (RDF::Literal) —

  a literal

• right (RDF::Literal) —

  a literal

Returns:

• (RDF::Literal::Boolean) —

  true or false

Raises:

• (TypeError) —

  if either operand is not a literal

# File 'lib/sparql/algebra/operator/less_than.rb', line 37

def apply(left, right, **options)
  RDF::Literal(super == RDF::Literal(-1))
end