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.car.watchdog;
18 
19 import java.time.Instant;
20 import java.time.ZoneOffset;
21 import java.time.ZonedDateTime;
22 import java.time.temporal.ChronoUnit;
23 
24 /**
25  * Provider for the current value of "now" for users of {@code java.time}.
26  */
27 public abstract class TimeSource {
28     public static final ZoneOffset ZONE_OFFSET = ZoneOffset.UTC;
29 
30     /** Returns the current instant from the time source implementation. */
now()31     public abstract Instant now();
32 
33     /** Returns the current date time for the UTC timezone. */
getCurrentDateTime()34     public ZonedDateTime getCurrentDateTime() {
35         return now().atZone(ZONE_OFFSET);
36     }
37 
38     /** Returns the current date for the UTC timezone without time. */
getCurrentDate()39     public ZonedDateTime getCurrentDate() {
40         return now().atZone(ZONE_OFFSET).truncatedTo(ChronoUnit.DAYS);
41     }
42 }
43