Class: SPARQL::Algebra::Operator::Equal

Inherits:
Compare show all
Defined in:
vendor/bundler/ruby/2.5.0/bundler/gems/sparql-b66c70fb77a0/lib/sparql/algebra/operator/equal.rb

Overview

The SPARQL relational = (equal) comparison operator.

Direct Known Subclasses

NotEqual

Constant Summary collapse

NAME =
:"="

Constants inherited from Binary

Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

ARITY, IsURI, URI

Instance Attribute Summary

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary collapse

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

Methods included from Expression

cast, #constant?, #evaluate, extension, extensions, for, #invalid?, new, #node?, open, #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) ⇒ RDF::Literal::Boolean

Returns TRUE if term1 and term2 are the same RDF term as defined in Resource Description Framework (RDF): Concepts and Abstract Syntax [CONCEPTS]; produces a type error if the arguments are both literal but are not the same RDF term *; returns FALSE otherwise. term1 and term2 are the same if any of the following is true:

  • term1 and term2 are equivalent IRIs as defined in 6.4 RDF URI References of [CONCEPTS].
  • term1 and term2 are equivalent literals as defined in 6.5.1 Literal Equality of [CONCEPTS].
  • term1 and term2 are the same blank node as described in 6.6 Blank Nodes of [CONCEPTS].

Parameters:

Returns:

Raises:

  • (TypeError)

    if either operand is not an RDF term or operands are not comperable

See Also:



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# File 'vendor/bundler/ruby/2.5.0/bundler/gems/sparql-b66c70fb77a0/lib/sparql/algebra/operator/equal.rb', line 29

def apply(term1, term2)
  term1 = term1.dup.extend(RDF::TypeCheck)
  term2 = term2.dup.extend(RDF::TypeCheck)
  RDF::Literal(term1 == term2)
end