Class: RDF::N3::Algebra::Math::AbsoluteValue

Inherits:
ResourceOperator
  • Object
show all
Defined in:
lib/rdf/n3/algebra/math/absolute_value.rb

Overview

The object is calulated as the absolute value of the subject.

See Also:

Constant Summary collapse

NAME = 
:mathAbsoluteValue
URI = 
RDF::N3::Math.absoluteValue

Instance Attribute Summary

Attributes included from Enumerable

#existentials, #universals

Instance Method Summary collapse

Methods inherited from ResourceOperator

#as_literal, #execute, #valid?

Methods included from Builtin

#each, #evaluate, #hash, #rank, #to_uri

Instance Method Details

#input_operand ⇒ RDF::Term

Input is either the subject or object

Returns:



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# File 'lib/rdf/n3/algebra/math/absolute_value.rb', line 32

def input_operand
  RDF::N3::List.new(values: operands)
end

#resolve(resource, position:) ⇒ RDF::Term

The math:absoluteValue operator takes string or number and calculates its absolute value.

Parameters:

  • resource (RDF::Term)
  • position (:subject, :object)

Returns:

See Also:

  • ResourceOperator#evaluate


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# File 'lib/rdf/n3/algebra/math/absolute_value.rb', line 17

def resolve(resource, position:)
  case position
  when :subject
    return nil unless resource.literal?
    as_literal(resource.as_number.abs)
  when :object
    return nil unless resource.literal? || resource.variable?
    resource
  end
end