private static int countNodes(MetadataTreeNode tree) {
        if (tree == null) {
            return 0;
        }

        int count = 1;
        MetadataTreeNode[] kids = tree.getChildren();
        if (kids == null || kids.length < 1) {
            return count;
        }
        for (MetadataTreeNode n : kids) {
            count += countNodes(n);
        }

        return count;