@Nullable
  private static RepositoryTreeNode getChild(final RepositoryTreeNode node, final Url url) {
    final List<RepositoryTreeNode> children = node.getAlreadyLoadedChildren();
    for (RepositoryTreeNode child : children) {
      if (child.getURL().equals(url)) {
        return child;
      }
    }
    return null;
  }
@Nullable
  private static RepositoryTreeNode getChild(final RepositoryTreeNode node, final Url url)