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      1 /*
      2  * Copyright (C) 2015 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.tv.testing;
     18 
     19 import com.android.tv.util.Clock;
     20 
     21 import java.util.concurrent.TimeUnit;
     22 
     23 /**
     24  * Fake implementation of Clock suitable for testing.
     25  *
     26  * <p>The current time only changes if {@link #setCurrentTimeMillis(long)}, {@link #increment} or
     27  * {@link #sleep(long)} is called.
     28  */
     29 public class FakeClock implements Clock {
     30     /**
     31      * Creates a fake clock with the time set to now and the boot time set to now - 100,000.
     32      */
     33     public static FakeClock createWithCurrentTime() {
     34         long now = System.currentTimeMillis();
     35         return new FakeClock(now, now - 100_000);
     36     }
     37 
     38     /**
     39      * Creates a fake clock with the time set to zero.
     40      */
     41     public static FakeClock createWithTimeOne() {
     42         return new FakeClock(1L, 0L);
     43     }
     44 
     45 
     46     private long mCurrentTimeMillis;
     47 
     48     private long mBootTimeMillis;
     49 
     50     private FakeClock(long currentTimeMillis, long bootTimeMillis) {
     51         mCurrentTimeMillis = currentTimeMillis;
     52         mBootTimeMillis = bootTimeMillis;
     53     }
     54 
     55     public void setCurrentTimeMillis(long ms) {
     56         if (ms < mBootTimeMillis) {
     57             throw new IllegalStateException("current time can not be before boot time");
     58         }
     59         mCurrentTimeMillis = ms;
     60     }
     61 
     62     public void setBootTimeMillis(long ms) {
     63         if (ms > mCurrentTimeMillis) {
     64             throw new IllegalStateException("boot time can not be after current time");
     65         }
     66         mBootTimeMillis = ms;
     67     }
     68 
     69     /**
     70      * Increment the current time by one unit of time.
     71      *
     72      * @param unit The time unit to increment by.
     73      */
     74     public void increment(TimeUnit unit) {
     75         increment(unit, 1);
     76     }
     77 
     78     /**
     79      * Increment the current time by {@code amount} unit of time.
     80      *
     81      * @param unit The time unit to increment by.
     82      * @param amount The amount of time units to increment by.
     83      */
     84     public void increment(TimeUnit unit, long amount) {
     85         mCurrentTimeMillis += unit.toMillis(amount);
     86     }
     87 
     88     @Override
     89     public long currentTimeMillis() {
     90         return mCurrentTimeMillis;
     91     }
     92 
     93     @Override
     94     public long elapsedRealtime() {
     95         return mCurrentTimeMillis - mBootTimeMillis;
     96     }
     97 
     98     /**
     99      * Sleep does not block it just updates the current time.
    100      */
    101     @Override
    102     public void sleep(long ms) {
    103         // TODO: implement blocking if needed.
    104         mCurrentTimeMillis += ms;
    105     }
    106 }
    107