class Configuration implements Iterable<Map.Entry<String,String>>,
                                      Writable {

  public File getFile(String dirsProp, String path)
    throws IOException {
    String[] dirs = getTrimmedStrings(dirsProp);
    int hashCode = path.hashCode();
    for (int i = 0; i < dirs.length; i++) {  // try each local dir
      int index = (hashCode+i & Integer.MAX_VALUE) % dirs.length;
      File file = new File(dirs[index], path);
      File dir = file.getParentFile();
      if (dir.exists() || dir.mkdirs()) {
        return file;
      }
    }
    throw new IOException("No valid local directories in property: "+dirsProp);
  }

  public  Configuration();
  public  Configuration(boolean loadDefaults);
  @SuppressWarnings("unchecked") public  Configuration(Configuration other);

}