Sha256: b92c76e142966b083b114f6f63b11f7828bc5abffe708a2b21194f9d801f13c3

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Stored size: 904 Bytes

Contents

module SPARQL; module Algebra
  class Operator
    ##
    # The SPARQL logical `abs` operator.
    #
    # @example
    #   (abs ?x)
    #
    # @see http://www.w3.org/TR/sparql11-query/#func-abs
    # @see http://www.w3.org/TR/xpath-functions/#func-abs
    class Abs < Operator::Unary
      include Evaluatable

      NAME = [:abs]

      ##
      # Returns the absolute value of `arg`. An error is raised if `arg` is not a numeric value.
      # 
      # @param  [RDF::Literal] operand
      #   the operand
      # @return [RDF::Literal] literal of same type
      # @raise  [TypeError] if the operand is not a numeric value
      def apply(operand)
        case operand
          when RDF::Literal::Numeric then operand.abs
          else raise TypeError, "expected an RDF::Literal::Numeric, but got #{operand.inspect}"
        end
      end
    end # Abs
  end # Operator
end; end # SPARQL::Algebra

Version data entries

11 entries across 11 versions & 1 rubygems

Version Path
sparql-3.1.0 lib/sparql/algebra/operator/abs.rb
sparql-3.0.2 lib/sparql/algebra/operator/abs.rb
sparql-3.0.1 lib/sparql/algebra/operator/abs.rb
sparql-3.0.0 lib/sparql/algebra/operator/abs.rb
sparql-2.2.2 lib/sparql/algebra/operator/abs.rb
sparql-2.2.1 lib/sparql/algebra/operator/abs.rb
sparql-2.2.0 lib/sparql/algebra/operator/abs.rb
sparql-2.1.0 lib/sparql/algebra/operator/abs.rb
sparql-2.0.0 lib/sparql/algebra/operator/abs.rb
sparql-2.0.0.beta2 lib/sparql/algebra/operator/abs.rb
sparql-2.0.0.beta1 lib/sparql/algebra/operator/abs.rb