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 public abstract class Clock {
25     /** Elapsed Realtime, see SystemClock.elapsedRealtime() */
elapsedRealtime()26     public long elapsedRealtime() {
27         throw new UnsupportedOperationException();
28     }
29 
30     /** Uptime, see SystemClock.uptimeMillis() */
uptimeMillis()31     public long uptimeMillis() {
32         throw new UnsupportedOperationException();
33     }
34 
35     /** Wall-clock time as per System.currentTimeMillis() */
currentTimeMillis()36     public long currentTimeMillis() {
37         throw new UnsupportedOperationException();
38     }
39 
40     public static final Clock SYSTEM_CLOCK = new Clock() {
41 
42         @Override
43         public long elapsedRealtime() {
44             return SystemClock.elapsedRealtime();
45         }
46 
47         @Override
48         public long uptimeMillis() {
49             return SystemClock.uptimeMillis();
50         }
51 
52         @Override
53         public long currentTimeMillis() {
54             return System.currentTimeMillis();
55         }
56     };
57 }
58