generic converter for Json -> object #VRaptor

Jsonable.java

public interface Jsonable { }

JsonableConverter.java

@Convert(Jsonable.class)
public class JsonableConverter implements Converter<Jsonable> {
   private XStreamBuilder builder;

   public JsonableConverter(XStreamBuilder builder) {
       this.builder = builder;
   }
    
   public Jsonable convert(String value, Class<? extends Jsonable> type, ResourceBundle bundle) {
      if (Strings.isNullOrEmpty(value)) return null;

      XStream stream = builder.jsonInstance();

      String json = String.format("{\"%s\" : %s}", type.getName(), value);

      return stream.fromXML(json);
   }

}