/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ 
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIFile;

/**
 * This interface provides a means for enumerating the contents of a directory.
 * It is similar to nsISimpleEnumerator except the retrieved entries are QI'ed 
 * to nsIFile, and there is a mechanism for closing the directory when the 
 * enumeration is complete.
 */
[scriptable, uuid(31f7f4ae-6916-4f2d-a81e-926a4e3022ee)]
interface nsIDirectoryEnumerator : nsISupports
{
  /**
   * Retrieves the next file in the sequence. The "nextFile" element is the 
   * first element upon the first call. This attribute is null if there is no 
   * next element.
   */
  readonly attribute nsIFile nextFile;

  /**
   * Closes the directory being enumerated, releasing the system resource.
   * @throws NS_OK if the call succeeded and the directory was closed.
   *         NS_ERROR_FAILURE if the directory close failed. 
   *         It is safe to call this function many times. 
   */
  void close();
};