private Node findChild(@NotNull Object element) {
      List<Node> list = children.get();
      if (list != null) {
        if (!list.isEmpty()) {
          int hashCode = element.hashCode();
          Node result = ContainerUtil.find(list, node -> node.matches(element, hashCode));
          if (result != null) return result; // found child node that matches given element
        }
        if (LOG.isTraceEnabled()) LOG.debug("node '", getElement(), "' have no child: ", element);
      }
      else {
        if (LOG.isTraceEnabled()) LOG.debug("node '", getElement(), "' have no loaded children");
      }
      return null;
    }
private Node findChild(@NotNull Object element)