java - How specify realization of interface in xStream? -

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the xml description of entities "messages". 

<message id="11600005" name="some_name">         <sourcepartitionid>11600</sourcepartitionid>         <destpartitionid>11700</destpartitionid>         <payloadid>1300005</payloadid>         <sourceudp>1045</sourceudp>         <destudp>1046</destudp>         <sourceip>10.4.48.0</sourceip>         <destip>10.4.49.0</destip>         <sourceport id="1045" name="sp_q_1045_11600_11700_005">             <type>queuing</type>             <maxmessagesize>8192</maxmessagesize>             <characteristic>1</characteristic>         </sourceport>         <destport id="1046" name="dp_q_1045_1046_11600_11700_005">             <type>queuing</type>             <maxmessagesize>8192</maxmessagesize>             <characteristic>1</characteristic>         </destport>     </message>

in fields sourceport , destport described object implements interface comport:

public interface comport {      enum porttype {sampling, queuing}     enum portdirection {rx,tx}      public porttype getporttype();     public portdirection getportdirection();      public int getmaxmessagesize();     public int getportcharacteristic();

at interface there 2 implementations: samplingport , queuingport. both main difference - characteristic field. tell me how make xstream based on <type> tag creates instance of corresponding implementation?

an important point: necessary consider when sourceport tag - direction field tx, , when destport tag - direction field rx

i figured out issue myself. first, need create class-converter:

public class comportconverter implements converter {      @override     public void marshal(object o, hierarchicalstreamwriter out, marshallingcontext context) {          comport comport = (comport)o;              if (comport.getportdirection()== comport.portdirection.tx){             out.startnode("sourceport");         }else {             out.startnode("destport");         }          out.addattribute("id",integer.tostring(comport.getid()));         out.addattribute("name", comport.getname());          out.startnode("type");         out.setvalue(comport.getporttype().name());         out.endnode();          out.startnode("maxmessagesize");         out.setvalue(integer.tostring(comport.getmaxmessagesize()));         out.endnode();          out.startnode("characteristic");         out.setvalue(integer.tostring(comport.getportcharacteristic()));             out.endnode();         out.close();     }      @override     public object unmarshal(hierarchicalstreamreader in, unmarshallingcontext context) {          comport result;         comport.portdirection direction=null;          if (in.getnodename().equals("sourceport")){             direction = comport.portdirection.tx;         }else if (in.getnodename().equals("destport")){             direction = comport.portdirection.rx;         }         int id = integer.parseint(in.getattribute("id"));         string name = in.getattribute("name");          in.movedown();         if (in.getvalue().equals("sampling")) result = new samplingport(id,name);         else if(in.getvalue().equals("queuing")) result = new queuingport(id,name);         else throw new illegalargumentexception("illegal port type value");         result.setportdirection(direction);         in.moveup();         in.movedown();         result.setmaxmessagesize(integer.parseint(in.getvalue()));         in.moveup();         in.movedown();         result.setportcharacteristic(integer.parseint(in.getvalue()));         in.moveup();          return result;     }      @override     public boolean canconvert(class type) {         return comport.class.isassignablefrom(type);     } }

then, need register converter

public static messagesstorage unmarshallingmessages(file file){         xstream xstream = new xstream();         xstream.processannotations(new class[]{messagesstorage.class,message.class});         xstream.registerconverter(new comportconverter());         return (messagesstorage) xstream.fromxml(file);     }

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