private static void _scanFileDir(URL url, int i, int maxLevels, URLScanHandler handler) {
if (i > maxLevels) return;
handler.handle(url, i);
i++;
handler.startChildren(i);
URLDirectory dir = new URLDirectory(url);
for (URL u : dir.list(null)) {
_scanFileDir(u, i, maxLevels, handler);
}
handler.endChildren(i);
}
