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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ 
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Directory Enumerator Interface.
 *
 * The Initial Developer of the Original Code is Google Inc.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Ben Goodger <ben@mozilla.org>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#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();
};