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# -*- coding: binary -*-
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##
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#
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# Net::DNS::RR::AAAA
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#
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# $id$
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#
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##
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require 'ipaddr'
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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 AAAA
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      #
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      class AAAA < RR
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        attr_reader :address
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        # Assign to the RR::AAAA object a new IPv6 address, which can be in the
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        # form of a string or an IPAddr object
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        #
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        #   a.address = "::1"
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        #   a.address = IPAddr.new("::1")
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        #
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        def address=(addr)
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          @address = check_address addr
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          build_pack
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        end # address=
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        private
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        def check_address(addr)
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          address = ""
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          case addr
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          when String 
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            address = IPAddr.new addr
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          when IPAddr
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            address = addr
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          else
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            raise RRArgumentError, "Unknown address type: #{addr.inspect}"
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          end
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          raise RRArgumentError, "Must specify an IPv6 address" unless address.ipv6?
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          address
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        rescue ArgumentError
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          raise RRArgumentError, "Invalid address #{addr.inspect}"
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        end
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        def build_pack
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          @address_pack = @address.hton
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          @rdlength = @address_pack.size
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        end
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        def set_type
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          @type = Net::DNS::RR::Types.new("AAAA")
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        end
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        def get_data
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          @address_pack
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        end
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        def get_inspect
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          "#@address"
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        end
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        def subclass_new_from_hash(args)
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          if args.has_key? :address 
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            @address = check_address args[:address]
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          else
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            raise RRArgumentError, ":address field is 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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          @address = check_address(str)
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        end
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        def subclass_new_from_binary(data,offset)
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          arr = data.unpack("@#{offset} n8")
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          @address = IPAddr.new sprintf("%x:%x:%x:%x:%x:%x:%x:%x",*arr)
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          return offset + 16
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        end
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      end # class AAAA
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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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