class CircusTrainCopyListing extends SimpleCopyListing {

  static Path getRootPath(Configuration conf) {
    String pathString = conf.get(CONF_ROOT_PATH);
    if (pathString == null) {
      throw new CircusTrainException("No root path was set.");
    }
    return new Path(pathString);
  }

  public  CircusTrainCopyListing(Configuration configuration, Credentials credentials);

}