private static File[] getMapFiles(final File dir) {
    if (dir == null) {
      return new File[0];
    }
    File[] ret = dir.listFiles(FileFilters.filesWithExtension("xml"));
    if (ret == null) {
      LOG.error("cannot read directory: " + dir.getAbsolutePath());
      return new File[0];
    }
    return ret;
  }
private static File[] getMapFiles(final File dir)