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/* -*- Mode: C++; tab-width: 2; 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 mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Michiel van Leeuwen (mvl@exedo.nl).
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Daniel Witte (dwitte@stanford.edu)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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"

/**
 * This interface provides a mechanism to control an output stream
 * that takes care not to overwrite an existing target until it is known
 * that all writes to the destination succeeded.
 * 
 * An object that supports this interface is intended to also support
 * nsIOutputStream.
 *
 * For example, a file output stream that supports this interface writes to
 * a temporary file, and moves it over the original file when |finish| is
 * called only if the stream can be successfully closed and all writes
 * succeeded.  If |finish| is called but something went wrong during
 * writing, it will delete the temporary file and not touch the original.
 * If the stream is closed by calling |close| directly, or the stream
 * goes away, the original file will not be overwritten, and the temporary
 * file will be deleted.
 *
 * Currently, this interface is implemented only for file output streams.
 */
[scriptable, uuid(5f914307-5c34-4e1f-8e32-ec749d25b27a)]
interface nsISafeOutputStream : nsISupports
{
    /**
     * Call this method to close the stream and cause the original target
     * to be overwritten. Note: if any call to |write| failed to write out
     * all of the data given to it, then calling this method will |close| the
     * stream and return failure. Further, if closing the stream fails, this
     * method will return failure. The original target will be overwritten only
     * if all calls to |write| succeeded and the stream was successfully closed.
     */
    void finish();
};