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# -*- coding: binary -*-
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##
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#
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# Net::DNS::RR::MX
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#
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#       $Id: MX.rb,v 1.8 2006/07/28 07:33:36 bluemonk Exp $     
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#
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##
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module Net
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  module DNS
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    class RR
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      #------------------------------------------------------------
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      # RR type MX
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      #------------------------------------------------------------
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      class MX < RR
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        attr_reader :preference, :exchange
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        private
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        def check_mx(str)
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          if str.strip =~ /^(\d+)\s+(\S+)$/
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            return $1.to_i,$2
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          else
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            raise RRArgumentError, "MX section not valid"
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          end
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        end
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        def build_pack
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          @mx_pack = [@preference].pack("n") + pack_name(@exchange)
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          @rdlength = @mx_pack.size
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        end
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        def set_type
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          @type = Net::DNS::RR::Types.new("MX")
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        end
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        def get_data
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          @mx_pack
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        end
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        def get_inspect
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          "#@preference #@exchange"
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        end
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        def subclass_new_from_hash(args)
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          if args.has_key? :preference and args.has_key? :exchange
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            @preference = args[0][:preference].to_i
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            @exchange =  args[0][:exchange]
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          else
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            raise RRArgumentError, ":preference and :exchange fields are mandatory but missing"
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          end
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        end
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        def subclass_new_from_string(str)
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          @preference,@exchange = check_mx(str)
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        end
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        def subclass_new_from_binary(data,offset)
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          @preference = data.unpack("@#{offset} n")[0]
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          offset += 2
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          @exchange,offset = dn_expand(data,offset)
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          return offset
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        end
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      end # class MX
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    end # class RR
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  end # module DNS
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end # module Net
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