1 /*
2  * Copyright (C) 2021 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.internal.os;
18 
19 import android.os.SystemClock;
20 
21 /**
22  * A wrapper for SystemClock, intended for mocking in unit tests.
23  */
24 @android.ravenwood.annotation.RavenwoodKeepWholeClass
25 public abstract class Clock {
26     /** Elapsed Realtime, see SystemClock.elapsedRealtime() */
elapsedRealtime()27     public long elapsedRealtime() {
28         throw new UnsupportedOperationException();
29     }
30 
31     /** Uptime, see SystemClock.uptimeMillis() */
uptimeMillis()32     public long uptimeMillis() {
33         throw new UnsupportedOperationException();
34     }
35 
36     /** Wall-clock time as per System.currentTimeMillis() */
currentTimeMillis()37     public long currentTimeMillis() {
38         throw new UnsupportedOperationException();
39     }
40 
41     public static final Clock SYSTEM_CLOCK = new Clock() {
42 
43         @Override
44         public long elapsedRealtime() {
45             return SystemClock.elapsedRealtime();
46         }
47 
48         @Override
49         public long uptimeMillis() {
50             return SystemClock.uptimeMillis();
51         }
52 
53         @Override
54         public long currentTimeMillis() {
55             return System.currentTimeMillis();
56         }
57     };
58 }
59