docs: public final TradingCatalog findTradingCatalogById(
      final List<TradingCatalog> pCatalogs,
        final Long pId) {
      for (TradingCatalog cat : pCatalogs) {
        if (cat.getCatalog().getItsId().equals(pId)) {
          return cat;
        }
        if (cat.getSubcatalogs().size() > 0) {
          //recursion:
          TradingCatalog tc = findTradingCatalogById(cat.getSubcatalogs(), pId);
          if (tc != null) {
            return tc;
          }
        }
      }
      return null;
    }