code: @Override
      public Map<String, Object> getQueryParameters() {
          HashMap<String, Object> params = new HashMap<String, Object>();
          params.put("itemType", this.itemType.toString());
          params.put("itemId", this.itemId.toString());
          return params;
      }
docs: Get query parameters
  @return Values of query parameters (name of parameter: value of the parameter)