@Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("directory", directory)
        .add("name", name)
        .add("file", file)
        .toString();
  }
Returns the file this entry links to or {@code null} if the file does not exist
jimfs/src/main/java/com/google/common/jimfs/DirectoryEntry.java