1 /*
2  * Copyright 2020 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.calendar;
18 
19 import android.content.ContentResolver;
20 import android.os.HandlerThread;
21 import android.util.Log;
22 
23 import androidx.annotation.Nullable;
24 import androidx.lifecycle.ViewModel;
25 
26 import com.android.car.calendar.common.EventDescriptions;
27 import com.android.car.calendar.common.EventLocations;
28 import com.android.car.calendar.common.EventsLiveData;
29 
30 import java.time.Clock;
31 import java.util.Locale;
32 
33 class CarCalendarViewModel extends ViewModel {
34     private static final String TAG = "CarCalendarViewModel";
35     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
36 
37     private final HandlerThread mHandlerThread = new HandlerThread("CarCalendarBackground");
38     private final Clock mClock;
39     private final ContentResolver mResolver;
40     private final Locale mLocale;
41 
42     @Nullable private EventsLiveData mEventsLiveData;
43 
CarCalendarViewModel(ContentResolver resolver, Locale locale, Clock clock)44     CarCalendarViewModel(ContentResolver resolver, Locale locale, Clock clock) {
45         if (DEBUG) Log.d(TAG, "Creating view model");
46         mResolver = resolver;
47         mHandlerThread.start();
48         mLocale = locale;
49         mClock = clock;
50     }
51 
52     /** Creates an {@link EventsLiveData} lazily and always returns the same instance. */
getEventsLiveData()53     EventsLiveData getEventsLiveData() {
54         if (mEventsLiveData == null) {
55             mEventsLiveData =
56                     new EventsLiveData(
57                             mClock,
58                             mHandlerThread.getThreadHandler(),
59                             mResolver,
60                             new EventDescriptions(mLocale),
61                             new EventLocations());
62         }
63         return mEventsLiveData;
64     }
65 
66     @Override
onCleared()67     protected void onCleared() {
68         super.onCleared();
69         mHandlerThread.quitSafely();
70     }
71 }
72