1 /*
2  * Copyright (C) 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.bedstead.nene.utils;
18 
19 /**
20  * Generic {@link AutoCloseable} used to undo changes in device state.
21  *
22  * <p>Typical usage:
23  * <pre>
24  * try (UndoableContext v = TestApis.packages().setVerifyAdbInstalls(false)) {
25  *    // The result of setVerifyAdvInstalls(false) is valid here
26  * }
27  * // it is not valid here
28  * </pre>
29  */
30 public class UndoableContext implements AutoCloseable {
31 
32     public static final UndoableContext EMPTY = new UndoableContext(() -> {});
33 
34     private final Runnable mUndo;
35 
UndoableContext(Runnable undo)36     public UndoableContext(Runnable undo) {
37         mUndo = undo;
38     }
39 
40     @Override
close()41     public void close() {
42         mUndo.run();
43     }
44 }
45