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# -*- coding: binary -*-
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##
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#
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# Net::DNS::RR::SOA
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#
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#       $Id: SOA.rb,v 1.4 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 SOA
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      #------------------------------------------------------------
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      class SOA < RR
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        attr_reader :mname, :rname, :serial, :refresh, :retry, :expire, :minimum
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        private
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        def build_pack
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          @soa_pack = pack_name(@mname)
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          @soa_pack += pack_name(@rname)
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          @soa_pack += [@serial,@refresh,@retry,@expire,@minimum].pack("N5")
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        end
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        def set_type
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          @type = Net::DNS::RR::Types.new("SOA")
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        end
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        def get_data
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          @soa_pack
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        end
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        def get_inspect
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          "#@mname #@rname #@serial #@refresh #@retry #@expire #@minimum"
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        end
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        def subclass_new_from_hash(args)
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          if args.has_key? :rdata
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            subclass_new_from_string(args[:rdata])
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          else
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            [:mname,:rname,:serial,:refresh,:retry,:expire,:minimum].each do |key|
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              raise RRArgumentError, "Missing field :#{key}" unless args.has_key? key
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            end
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            @mname = args[:mname] if valid? args[:mname] 
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            @rname = args[:rname] if valid? args[:rname]
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            @serial = args[:serial] if number? args[:serial] 
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            @refresh = args[:refresh] if number? args[:refresh] 
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            @retry = args[:retry] if number? args[:retry] 
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            @expire = args[:expire] if number? args[:expire] 
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            @minimum = args[:minimum] if number? args[:minimum] 
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          end
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        end
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        def number?(num)
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          if num.kind_of? Integer and num > 0
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            true
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          else
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            raise RRArgumentError, "Wrong format field: #{num} not a number or less than zero"
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          end
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        end
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        def subclass_new_from_string(str)
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          mname,rname,serial,refresh,ret,expire,minimum = str.strip.split(" ")
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          @mname = mname if valid? mname
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          @rname = rname if valid? rname
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          @serial,@refresh,@retry,@expire,@minimum = [serial,refresh,ret,expire,minimum].collect do |i| 
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            i.to_i if valid? i.to_i
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          end
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        end
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        def subclass_new_from_binary(data,offset)
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          @mname,offset = dn_expand(data,offset)
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          @rname,offset = dn_expand(data,offset)
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          @serial,@refresh,@retry,@expire,@minimum = data.unpack("@#{offset} N5")
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          return offset + 5*Net::DNS::INT32SZ
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        end
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      end # class SOA
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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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