code: private String prepareQueryParameters(Map<J4pQueryParameter, String> pProcessingOptions) {
          if (pProcessingOptions != null && pProcessingOptions.size() > 0) {
              StringBuilder queryParams = new StringBuilder();
              for (Map.Entry<J4pQueryParameter,String> entry : pProcessingOptions.entrySet()) {
                  queryParams.append(entry.getKey().getParam()).append("=").append(entry.getValue()).append("&");
              }
              return queryParams.substring(0,queryParams.length() - 1);
          } else {
              return null;
          }
      }
docs: prepare query parameters