docs: public void setSafetyLevel(String photoId, String safetyLevel, Boolean hidden) throws FlickrException {
          Map<String, Object> parameters = new HashMap<String, Object>();
          parameters.put("method", METHOD_SET_SAFETYLEVEL);
  
          parameters.put("photo_id", photoId);
  
          if (safetyLevel != null) {
              parameters.put("safety_level", safetyLevel);
          }
  
          if (hidden != null) {
              parameters.put("hidden", hidden.booleanValue() ? "1" : "0");
          }
  
          Response response = transport.post(transport.getPath(), parameters, apiKey, sharedSecret);
          if (response.isError()) {
              throw new FlickrException(response.getErrorCode(), response.getErrorMessage());
          }
      }