1 /*
2  * Copyright (C) 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.permissioncontroller.permission.data
18 
19 import android.app.Application
20 import android.app.role.RoleManager
21 import android.os.UserHandle
22 import com.android.permissioncontroller.PermissionControllerApplication
23 import com.android.permissioncontroller.permission.data.RoleListenerMultiplexer.RoleHoldersChangeCallback
24 import kotlinx.coroutines.Job
25 
26 /**
27  * LiveData for a list of packages which hold a given role for a user.
28  *
29  * @param app The current application
30  * @param roleName The name of the role
31  */
32 class RoleHoldersLiveData private constructor(
33     private val app: Application,
34     private val roleName: String,
35     private val user: UserHandle
36 ) : SmartAsyncMediatorLiveData<List<String>>(), RoleHoldersChangeCallback {
37 
38     private val roleManager = app.getSystemService(RoleManager::class.java)!!
39 
40     override fun onActive() {
41         super.onActive()
42         RoleListenerMultiplexer.addCallback(roleName, user, this)
43     }
44 
45     override fun onInactive() {
46         super.onInactive()
47         RoleListenerMultiplexer.removeCallback(roleName, user, this)
48     }
49 
50     override suspend fun loadDataAndPostValue(job: Job) {
51         postValue(roleManager.getRoleHoldersAsUser(roleName, user))
52     }
53 
54     override fun onRoleHoldersChanged() {
55         updateAsync()
56     }
57 
58     /**
59      * Repository for RoleHoldersLiveData.
60      * <p> Key value is the name of the role.
61      */
62     companion object : DataRepository<Pair<String, UserHandle>, RoleHoldersLiveData>() {
63         override fun newValue(key: Pair<String, UserHandle>): RoleHoldersLiveData {
64             return RoleHoldersLiveData(PermissionControllerApplication.get(), key.first, key.second)
65         }
66     }
67 }
68