code: @Override
      protected String getLinkToCurrentPage(HttpServletRequest req) {
          return "mskShowCumulatedProducers" + '?' + PARAM_DECORATOR + '=' + req.getParameter(PARAM_DECORATOR) +
                  (!StringUtils.isEmpty(req.getParameter(PARAM_CATEGORY)) ? ('&' + PARAM_CATEGORY + '=' + req.getParameter(PARAM_CATEGORY)) : "") +
                  (!StringUtils.isEmpty(req.getParameter(PARAM_SUBSYSTEM)) ? ('&' + PARAM_SUBSYSTEM + '=' + req.getParameter(PARAM_SUBSYSTEM)) : "");
      }
docs: {@inheritDoc}