public String convertBeforePath(final String path, final TreeMap<String, String> after2before) {
      String current = path;
      // backwards
      for (String key : after2before.descendingKeySet()) {
        if (Url.isAncestor(key, current)) {
          final String relativePath = Url.getRelative(key, current);
          current = Url.append(after2before.get(key), relativePath);
        }
      }
      return current;
    }
public String convertBeforePath(final String path, final TreeMap<String, String> after2before)