# File resolv.rb, line 1546
        def self.decode_rdata(msg)
          preference, = msg.get_unpack('n')
          exchange = msg.get_name
          return self.new(preference, exchange)
        end

# File resolv.rb, line 1535
        def initialize(preference, exchange)
          @preference = preference
          @exchange = exchange
        end

# File resolv.rb, line 1541
        def encode_rdata(msg)
          msg.put_pack('n', @preference)
          msg.put_name(@exchange)
        end