mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 22:55:23 +00:00
40 lines
1.8 KiB
Plaintext
40 lines
1.8 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; 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"
|
|
|
|
/**
|
|
* 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();
|
|
};
|