docs: @RequestMapping(params = "action=export")
      public ModelAndView getExportView(PortletRequest request) {
          Map<String, Object> model = new HashMap<String, Object>();
  
          // add a list of all permitted export types
          final Iterable<IPortalDataType> exportPortalDataTypes =
                  this.portalDataHandlerService.getExportPortalDataTypes();
          final List<IPortalDataType> types =
                  getAllowedTypes(request, IPermission.EXPORT_ACTIVITY, exportPortalDataTypes);
          model.put("supportedTypes", types);
  
          return new ModelAndView("/jsp/ImportExportPortlet/export", model);
      }