Contents

module RDF; class Literal
  ##
  # An integer literal.
  #
  # @see   http://www.w3.org/TR/xmlschema-2/#integer
  # @since 0.2.1
  class Integer < Decimal
    DATATYPE = XSD.integer
    GRAMMAR  = /^[\+\-]?\d+$/.freeze

    ##
    # @param  [Integer, #to_i] value
    # @option options [String] :lexical (nil)
    def initialize(value, options = {})
      @datatype = RDF::URI(options[:datatype] || DATATYPE)
      @string   = options[:lexical] if options.has_key?(:lexical)
      @string   = value if !defined?(@string) && value.is_a?(String)
      @object   = case
        when value.is_a?(::String)    then Integer(value) rescue nil
        when value.is_a?(::Integer)   then value
        when value.respond_to?(:to_i) then value.to_i
        else Integer(value.to_s) rescue nil
      end
    end

    ##
    # Converts the literal into its canonical lexical representation.
    #
    # @return [Literal]
    # @see    http://www.w3.org/TR/xmlschema-2/#integer
    def canonicalize
      @string = @object.to_s if @object
      self
    end

    ##
    # Returns the value as a string.
    #
    # @return [String]
    def to_s
      @string || @object.to_s
    end

    ##
    # Returns the value as an integer.
    #
    # @return [Integer]
    def to_i
      @object.to_i
    end

    ##
    # Returns the value as a floating point number.
    #
    # @return [Float]
    def to_f
      @object.to_f
    end

    ##
    # Returns the value as a decimal number.
    #
    # @return [BigDecimal]
    def to_d
      @object.respond_to?(:to_d) ? @object.to_d : BigDecimal(@object.to_s)
    end

    ##
    # Returns the value as a rational number.
    #
    # @return [Rational]
    def to_r
      @object.to_r
    end
  end # class Integer
end; end # class RDF::Literal

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
rdf-0.2.2	lib/rdf/model/literal/integer.rb