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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();
- };
-