1 /*
2  * Copyright (C) 2022 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.systemui.complication;
18 
19 import androidx.lifecycle.LiveData;
20 import androidx.lifecycle.Transformations;
21 import androidx.lifecycle.ViewModel;
22 
23 import java.util.Collection;
24 import java.util.stream.Collectors;
25 
26 import javax.inject.Inject;
27 
28 /**
29  * {@link ComplicationCollectionViewModel} is an abstraction for observing and accessing
30  * {@link ComplicationViewModel} for registered {@link Complication}.
31  */
32 public class ComplicationCollectionViewModel extends ViewModel {
33     private final LiveData<Collection<ComplicationViewModel>> mComplications;
34     private final ComplicationViewModelTransformer mTransformer;
35 
36     /**
37      * Injectable constructor for {@link ComplicationCollectionViewModel}. Note that this cannot
38      * be implicitly injected. Clients must bind scoped instance values through the corresponding
39      * dagger subcomponent.
40      */
41     @Inject
ComplicationCollectionViewModel( ComplicationCollectionLiveData complications, ComplicationViewModelTransformer transformer)42     public ComplicationCollectionViewModel(
43             ComplicationCollectionLiveData complications,
44             ComplicationViewModelTransformer transformer) {
45         mComplications = Transformations.map(complications, collection -> convert(collection));
46         mTransformer = transformer;
47     }
48 
convert(Collection<Complication> complications)49     private Collection<ComplicationViewModel> convert(Collection<Complication> complications) {
50         return complications
51                 .stream()
52                 .map(complication -> mTransformer.getViewModel(complication))
53                 .collect(Collectors.toSet());
54     }
55 
56     /**
57      * Returns {@link LiveData} for the collection of {@link Complication} represented as
58      * {@link ComplicationViewModel}.
59      */
getComplications()60     public LiveData<Collection<ComplicationViewModel>> getComplications() {
61         return mComplications;
62     }
63 }
64