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Contents

module SPARQL; module Algebra
  class Operator
    ##
    # The SPARQL logical `year` operator.
    #
    # @example
    #     (prefix ((: <http://example.org/>))
    #       (project (?s ?x)
    #         (extend ((?x (year ?date)))
    #           (bgp (triple ?s :date ?date)))))
    #
    # @see http://www.w3.org/TR/sparql11-query/#func-year
    class Year < Operator::Unary
      include Evaluatable

      NAME = :year

      ##
      # Returns the year part of arg as an integer.
      #
      # @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)
        RDF::Literal(operand.object.year)
      end
    end # Year
  end # Operator
end; end # SPARQL::Algebra

Version data entries

17 entries across 17 versions & 1 rubygems

Version Path
sparql-1.99.1 lib/sparql/algebra/operator/year.rb
sparql-1.1.9.1 lib/sparql/algebra/operator/year.rb
sparql-1.99.0 lib/sparql/algebra/operator/year.rb
sparql-1.1.9 lib/sparql/algebra/operator/year.rb
sparql-1.1.8 lib/sparql/algebra/operator/year.rb
sparql-1.1.7 lib/sparql/algebra/operator/year.rb
sparql-1.1.6 lib/sparql/algebra/operator/year.rb
sparql-1.1.5 lib/sparql/algebra/operator/year.rb
sparql-1.1.4 lib/sparql/algebra/operator/year.rb
sparql-1.1.3 lib/sparql/algebra/operator/year.rb
sparql-1.1.2.1 lib/sparql/algebra/operator/year.rb
sparql-1.1.2 lib/sparql/algebra/operator/year.rb
sparql-1.1.1 lib/sparql/algebra/operator/year.rb
sparql-1.1.0 lib/sparql/algebra/operator/year.rb
sparql-1.1.0p0 lib/sparql/algebra/operator/year.rb
sparql-1.0.8 lib/sparql/algebra/operator/year.rb
sparql-1.0.7 lib/sparql/algebra/operator/year.rb