#--
#Copyright 2007 Nominet UK
#
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License. 
#You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0 
#
#Unless required by applicable law or agreed to in writing, software 
#distributed under the License is distributed on an "AS IS" BASIS, 
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
#See the License for the specific language governing permissions and 
#limitations under the License.
#++
module Dnsruby
  class RR
    #Class for DNS Mail Exchanger (MX) resource records.
    #RFC 1035 Section 3.3.9
    class MX < RR
      ClassValue = nil #:nodoc: all
      TypeValue= Types::MX #:nodoc: all
      
      #The preference for this mail exchange.
      attr_accessor :preference
      #The name of this mail exchange.
      attr_accessor :exchange
      
      def from_hash(hash) #:nodoc: all
        @preference = hash[:preference]
        @exchange = Name.create(hash[:exchange])
      end
      
      def from_data(data) #:nodoc: all
        @preference, @exchange = data
      end
      
      def from_string(input) #:nodoc: all
        if (input.length > 0)
          names = input.split(" ")
          @preference = names[0].to_i
          @exchange = Name.create(names[1])
        end
      end
      
      def rdata_to_string #:nodoc: all
        if (@preference!=nil)
          return "#{@preference} #{@exchange.to_s(true)}"
        else
          return ""
        end
      end
      
      def encode_rdata(msg, canonical=false) #:nodoc: all
        msg.put_pack('n', @preference, canonical)
        msg.put_name(@exchange, canonical)
      end
      
      def self.decode_rdata(msg) #:nodoc: all
        preference, = msg.get_unpack('n')
        exchange = msg.get_name
        return self.new([preference, exchange])
      end
    end 
  end
end