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73 lines
3.3 KiB
Plaintext
73 lines
3.3 KiB
Plaintext
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Michiel van Leeuwen (mvl@exedo.nl).
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Witte (dwitte@stanford.edu)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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/**
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* This interface provides a mechanism to control an output stream
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* that takes care not to overwrite an existing target until it is known
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* that all writes to the destination succeeded.
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*
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* An object that supports this interface is intended to also support
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* nsIOutputStream.
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*
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* For example, a file output stream that supports this interface writes to
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* a temporary file, and moves it over the original file when |finish| is
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* called only if the stream can be successfully closed and all writes
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* succeeded. If |finish| is called but something went wrong during
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* writing, it will delete the temporary file and not touch the original.
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* If the stream is closed by calling |close| directly, or the stream
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* goes away, the original file will not be overwritten, and the temporary
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* file will be deleted.
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*
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* Currently, this interface is implemented only for file output streams.
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*/
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[scriptable, uuid(5f914307-5c34-4e1f-8e32-ec749d25b27a)]
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interface nsISafeOutputStream : nsISupports
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{
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/**
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* Call this method to close the stream and cause the original target
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* to be overwritten. Note: if any call to |write| failed to write out
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* all of the data given to it, then calling this method will |close| the
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* stream and return failure. Further, if closing the stream fails, this
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* method will return failure. The original target will be overwritten only
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* if all calls to |write| succeeded and the stream was successfully closed.
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*/
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void finish();
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};
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