1 /*
2  * Copyright (C) 2024 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.settings.datausage
18 
19 import android.content.Context
20 import com.android.settings.R
21 import com.android.settings.widget.MainSwitchBarMetadata
22 import com.android.settingslib.datastore.AbstractKeyedDataObservable
23 import com.android.settingslib.datastore.DataChangeReason
24 import com.android.settingslib.datastore.KeyValueStore
25 import com.android.settingslib.metadata.PreferenceLifecycleProvider
26 import com.android.settingslib.metadata.ReadWritePermit
27 import com.android.settingslib.metadata.SensitivityLevel
28 
29 class DataSaverMainSwitchPreference : MainSwitchBarMetadata, PreferenceLifecycleProvider {
30 
31     override val key
32         get() = KEY
33 
34     override val title
35         get() = R.string.data_saver_switch_title
36 
storagenull37     override fun storage(context: Context) = createDataStore(context)
38 
39     override fun getReadPermit(context: Context, myUid: Int, callingUid: Int) =
40         ReadWritePermit.ALLOW
41 
42     override fun getWritePermit(context: Context, value: Boolean?, myUid: Int, callingUid: Int) =
43         ReadWritePermit.ALLOW
44 
45     override val sensitivityLevel
46         get() = SensitivityLevel.NO_SENSITIVITY
47 
48     @Suppress("UNCHECKED_CAST")
49     private class DataSaverStore(private val dataSaverBackend: DataSaverBackend) :
50         AbstractKeyedDataObservable<String>(), KeyValueStore, DataSaverBackend.Listener {
51 
52         override fun contains(key: String) = key == KEY
53 
54         override fun <T : Any> getValue(key: String, valueType: Class<T>): T? =
55             dataSaverBackend.isDataSaverEnabled as T?
56 
57         override fun <T : Any> setValue(key: String, valueType: Class<T>, value: T?) {
58             dataSaverBackend.isDataSaverEnabled = value as Boolean
59         }
60 
61         override fun onFirstObserverAdded() = dataSaverBackend.addListener(this)
62 
63         override fun onLastObserverRemoved() = dataSaverBackend.remListener(this)
64 
65         override fun onDataSaverChanged(isDataSaving: Boolean) =
66             notifyChange(KEY, DataChangeReason.UPDATE)
67     }
68 
69     companion object {
70         const val KEY = "use_data_saver"
71 
72         /** Creates [KeyValueStore] for data saver preference. */
createDataStorenull73         fun createDataStore(context: Context): KeyValueStore =
74             DataSaverStore(DataSaverBackend(context))
75     }
76 }
77