public Entry ensureDirectoryExists(String path) {
    Entry parent = this;
    for (String each : Paths.split(path)) {
      Entry nextParent = parent.findChild(each);
      if (nextParent == null) {
        parent.addChild(nextParent = new DirectoryEntry(each));
      }
      parent = nextParent;
    }
    return parent;
  }
public Entry ensureDirectoryExists(String path)