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# -*- coding: binary -*-
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##
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#
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# Net::DNS::RR::CNAME
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#
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#       $Id: CNAME.rb,v 1.7 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 CNAME
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      #------------------------------------------------------------
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      class CNAME < RR
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        attr_reader :cname
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        private
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        def check_name(name)
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          unless name =~ /(\w\.?)+\s*$/ and name =~ /[a-zA-Z]/
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            raise RRArgumentError, "Canonical Name not valid: #{name}"
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          end
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          name
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        end
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        def build_pack
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          @cname_pack = pack_name(@cname)
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          @rdlength = @cname_pack.size
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        end
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        def set_type
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          @type = Net::DNS::RR::Types.new("CNAME")
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        end
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        def get_data
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          @cname_pack
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        end
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        def get_inspect
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          "#@cname"
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        end
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        def subclass_new_from_hash(args)
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          if args.has_key? :cname
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            @cname = check_name args[:cname]
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          else
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            raise RRArgumentError, ":cname 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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          @cname = check_name(str)
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        end
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        def subclass_new_from_binary(data,offset)
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          @cname,offset = dn_expand(data,offset)
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          return offset
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        end
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      end # class CNAME
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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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