Contents

module Reddy
  class BNode
    attr_accessor :identifier
    def initialize(identifier = nil)
      if identifier != nil && self.valid_id?(identifier) != false
        @identifier = identifier
      else
        @identifier = "bn" + self.hash.to_i.abs.to_s
	# perhaps this needs to be slightly cleverer - check whether it's negative, and if it is, append an extra bit on the end aaaaaas distinction. TODO
      end
    end

    def eql? (other)
      other.is_a?(self.class) && other.identifier == self.identifier
    end

    alias_method :==, :eql?

    ## 
    # Exports the BNode in N-Triples form.
    #
    # ==== Example
    #   b = BNode.new; b.to_n3  # => returns a string of the BNode in n3 form
    #
    # ==== Returns
    # @return [String] The BNode in n3.
    #
    # @author Tom Morris

    def to_n3
      "_:" + @identifier
    end


    ## 
    # Exports the BNode in N-Triples form.
    #
    # ==== Example
    #   b = BNode.new; b.to_ntriples  # => returns a string of the BNode in N-Triples form
    #
    # ==== Returns
    # @return [String] The BNode in N-Triples.
    #
    # @author Tom Morris

    def to_ntriples
      self.to_n3
    end

    ##
    # Returns the identifier as a string.
    # 
    # === Returns
    # @return [String] Blank node identifier.
    #
    # @author Tom Morris
    def to_s
      @identifier
    end  

    protected
    def valid_id? name
      if name =~ /^[a-zA-Z_][a-zA-Z0-9]*$/
        true
      else
        false
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
reddy-0.1.0	lib/reddy/bnode.rb