public JSONObject describeClass(Class<?> clazz) throws Exception {
   JSONObject desc = new JSONObject();
   desc.put("name", clazz.getName());
   if (clazz.isEnum()) {
     @SuppressWarnings("unchecked")
     Class<Enum<?>> enumClass = (Class<Enum<?>>) clazz;
     ArrayList<String> enumNames = Lists.newArrayList();
     for (Enum<?> e : enumClass.getEnumConstants()) {
       enumNames.add(e.name());
     }
     desc.put("enum", enumNames);
   }
   UI_TYPE ui_type = UI_TYPE.getEnumFor(clazz);
   if (ui_type != null) {
     desc.put("uiType", ui_type.getName());
   }
   desc.put("properties", getClassProperties(clazz, 0));
   return desc;
 }