private @NotNull Counters calculatePosition(@NotNull DefaultMutableTreeNode foundNode) {
    Counters counters = new Counters();
    @SuppressWarnings("unchecked")
    Enumeration<TreeNode> enumeration = ((DefaultMutableTreeNode)foundNode.getRoot()).preorderEnumeration();
    while (enumeration.hasMoreElements()) {
      TreeNode node = enumeration.nextElement();
      if (node instanceof DefaultMutableTreeNode && isOccurrenceNode((DefaultMutableTreeNode)node)) {
        counters.myOccurencesCount++;
      }
      if (node == foundNode) {
        counters.myFoundOccurenceNumber = counters.myOccurencesCount;
      }
    }
    return counters;
  }
private @NotNull Counters calculatePosition(@NotNull DefaultMutableTreeNode foundNode)