docs: @Override
      public Map<String, String[]> getPrivateParameterMap() {
          if (this.portletRequestInfo != null) {
              final Map<String, List<String>> portletParameters =
                      this.portletRequestInfo.getPortletParameters();
              return ParameterMap.convertListMap(portletParameters);
          }
  
          // Only re-use render parameters on a render request
          if (this.portalRequestInfo.getUrlType() == UrlType.RENDER) {
              return this.portletWindow.getRenderParameters();
          }
  
          return Collections.emptyMap();
      }