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/*
* Copyright (C) 2019 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.pm.PackageManager
import com.android.permissioncontroller.PermissionControllerApplication
/**
* Serves as a single shared Permission Change Listener for all AppPermissionGroupLiveDatas.
*
*/
object PermissionListenerMultiplexer : PackageManager.OnPermissionsChangedListener {
private val app: Application = PermissionControllerApplication.get()
/**
* Map<UID, list of PermissionChangeCallbacks that wish to be informed when
* permissions are updated for that UID>
*/
private val callbacks = mutableMapOf<Int, MutableList<PermissionChangeCallback>>()
private val pm = app.applicationContext.packageManager
override fun onPermissionsChanged(uid: Int) {
callbacks[uid]?.toList()?.forEach { callback ->
callback.onPermissionChange()
}
}
fun addOrReplaceCallback(oldUid: Int?, newUid: Int, callback: PermissionChangeCallback) {
if (oldUid != null) {
removeCallback(oldUid, callback)
}
addCallback(newUid, callback)
}
fun addCallback(uid: Int, callback: PermissionChangeCallback) {
val wasEmpty = callbacks.isEmpty()
callbacks.getOrPut(uid, { mutableListOf() }).add(callback)
if (wasEmpty) {
pm.addOnPermissionsChangeListener(this)
}
}
fun removeCallback(uid: Int, callback: PermissionChangeCallback) {
if (!callbacks.contains(uid)) {
return
}
if (!callbacks[uid]!!.remove(callback)) {
return
}
if (callbacks[uid]!!.isEmpty()) {
callbacks.remove(uid)
}
if (callbacks.isEmpty()) {
pm.removeOnPermissionsChangeListener(this)
}
}
interface PermissionChangeCallback {
fun onPermissionChange()
}
}
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