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module SPARQL; module Algebra
  class Operator
    ##
    # The SPARQL logical `tz` operator.
    #
    # Returns the timezone part of `arg` as a simple literal. Returns the empty string if there is no timezone.
    #
    # @example
    #     (prefix ((: <http://example.org/>))
    #       (project (?s ?x)
    #         (extend ((?x (tz ?date)))
    #           (bgp (triple ?s :date ?date)))))
    #
    # @see http://www.w3.org/TR/sparql11-query/#func-tz
    class TZ < Operator::Unary
      include Evaluatable

      NAME = :tz

      ##
      # Returns the timezone part of arg as a simple literal. Returns the empty string if there is no timezone.
      #
      # @param  [RDF::Literal] operand
      #   the operand
      # @return [RDF::Literal]
      # @raise  [TypeError] if the operand is not a simple literal
      def apply(operand)
        raise TypeError, "expected an RDF::Literal::DateTime, but got #{operand.inspect}" unless operand.is_a?(RDF::Literal::DateTime)
        operand.tz
      end
    end # TZ
  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/tz.rb
sparql-3.0.2 lib/sparql/algebra/operator/tz.rb
sparql-3.0.1 lib/sparql/algebra/operator/tz.rb
sparql-3.0.0 lib/sparql/algebra/operator/tz.rb
sparql-2.2.2 lib/sparql/algebra/operator/tz.rb
sparql-2.2.1 lib/sparql/algebra/operator/tz.rb
sparql-2.2.0 lib/sparql/algebra/operator/tz.rb
sparql-2.1.0 lib/sparql/algebra/operator/tz.rb
sparql-2.0.0 lib/sparql/algebra/operator/tz.rb
sparql-2.0.0.beta2 lib/sparql/algebra/operator/tz.rb
sparql-2.0.0.beta1 lib/sparql/algebra/operator/tz.rb