blob: d514702ac46e7c56c5e0b115cea162244c15be40 [file] [log] [blame]
timothy@apple.com27b08c92013-06-11 19:16:26 +00001/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
drousso@apple.com0b21e4c2017-08-02 03:09:57 +000026WI.Revision = class Revision
timothy@apple.com27b08c92013-06-11 19:16:26 +000027{
timothy@apple.com27b08c92013-06-11 19:16:26 +000028 // Public
29
joepeck@webkit.org861f3fe2015-03-20 00:18:15 +000030 apply()
timothy@apple.com27b08c92013-06-11 19:16:26 +000031 {
32 // Implemented by subclasses.
33 console.error("Needs to be implemented by a subclass.");
joepeck@webkit.org861f3fe2015-03-20 00:18:15 +000034 }
timothy@apple.com27b08c92013-06-11 19:16:26 +000035
joepeck@webkit.org861f3fe2015-03-20 00:18:15 +000036 revert()
timothy@apple.com27b08c92013-06-11 19:16:26 +000037 {
38 // Implemented by subclasses.
39 console.error("Needs to be implemented by a subclass.");
joepeck@webkit.org861f3fe2015-03-20 00:18:15 +000040 }
timothy@apple.com27b08c92013-06-11 19:16:26 +000041
joepeck@webkit.org861f3fe2015-03-20 00:18:15 +000042 copy()
timothy@apple.com27b08c92013-06-11 19:16:26 +000043 {
44 // Override by subclasses.
45 return this;
46 }
47};