PermissionController/src/com/android/permissioncontroller/permission/data/SelectedVoiceInteractionServiceLiveData.kt

/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.permissioncontroller.permission.data

import android.app.Application
import android.content.ComponentName
import android.os.UserHandle
import android.provider.Settings
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.utils.Utils
import kotlinx.coroutines.Job

/**
 * A LiveData which tracks selected voice interaction service package
 *
 * @param app The current application
 * @param user The user the services should be determined for
 */
class SelectedVoiceInteractionServiceLiveData(
    private val app: Application,
    private val user: UserHandle
) : SmartAsyncMediatorLiveData<String?>() {

    override suspend fun loadDataAndPostValue(job: Job) {
        if (job.isCancelled) {
            return
        }

        val packageName = Settings.Secure.getString(
                Utils.getUserContext(app, user).contentResolver,
                // Settings.Secure.VOICE_INTERACTION_SERVICE
                "voice_interaction_service")
            ?.let(ComponentName::unflattenFromString)
            ?.packageName

        postValue(packageName)
    }

    /**
     * Repository for [SelectedVoiceInteractionServiceLiveData]
     *
     * <p> Key value is a user, value is its corresponding LiveData.
     */
    companion object : DataRepositoryForPackage<UserHandle,
            SelectedVoiceInteractionServiceLiveData>() {
        override fun newValue(key: UserHandle): SelectedVoiceInteractionServiceLiveData {
            return SelectedVoiceInteractionServiceLiveData(
                PermissionControllerApplication.get(), key)
        }
    }
}