1 /* 2 * Copyright (C) 2016 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.packageinstaller; 18 19 import android.annotation.NonNull; 20 import android.content.BroadcastReceiver; 21 import android.content.Context; 22 import android.content.Intent; 23 24 /** 25 * Receives uninstall events and persists them using a {@link EventResultPersister}. 26 */ 27 public class UninstallEventReceiver extends BroadcastReceiver { 28 private static final Object sLock = new Object(); 29 private static EventResultPersister sReceiver; 30 31 /** 32 * Get the event receiver persisting the results 33 * 34 * @return The event receiver. 35 */ getReceiver(@onNull Context context)36 @NonNull private static EventResultPersister getReceiver(@NonNull Context context) { 37 synchronized (sLock) { 38 if (sReceiver == null) { 39 sReceiver = new EventResultPersister( 40 TemporaryFileManager.getUninstallStateFile(context)); 41 } 42 } 43 44 return sReceiver; 45 } 46 47 @Override onReceive(Context context, Intent intent)48 public void onReceive(Context context, Intent intent) { 49 getReceiver(context).onEventReceived(context, intent); 50 } 51 52 /** 53 * Add an observer. If there is already an event for this id, call back inside of this call. 54 * 55 * @param context A context of the current app 56 * @param id The id the observer is for or {@code GENERATE_NEW_ID} to generate a new one. 57 * @param observer The observer to call back. 58 * 59 * @return The id for this event 60 */ addObserver(@onNull Context context, int id, @NonNull EventResultPersister.EventResultObserver observer)61 static int addObserver(@NonNull Context context, int id, 62 @NonNull EventResultPersister.EventResultObserver observer) 63 throws EventResultPersister.OutOfIdsException { 64 return getReceiver(context).addObserver(id, observer); 65 } 66 67 /** 68 * Remove a observer. 69 * 70 * @param context A context of the current app 71 * @param id The id the observer was added for 72 */ removeObserver(@onNull Context context, int id)73 static void removeObserver(@NonNull Context context, int id) { 74 getReceiver(context).removeObserver(id); 75 } 76 77 /** 78 * @param context A context of the current app 79 * 80 * @return A new uninstall id 81 */ getNewId(@onNull Context context)82 static int getNewId(@NonNull Context context) throws EventResultPersister.OutOfIdsException { 83 return getReceiver(context).getNewId(); 84 } 85 } 86