@Override
  protected IterationResultHolder doChecks(final TreeNode node) {
    if (! (node instanceof RepositoryTreeNode)) {
      return IterationResultHolder.RESULT;
    }
    if (! node.isLeaf()) {
      // folder. folders come first
      return IterationResultHolder.SKIP;
    }
    return IterationResultHolder.DO_NOTHING;
  }
@Override
  protected IterationResultHolder doChecks(final TreeNode node)