1 /* 2 * Copyright (C) 2015 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.server.telecom; 18 19 import android.content.BroadcastReceiver; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.IntentFilter; 23 24 import com.android.internal.util.IndentingPrintWriter; 25 26 import java.util.Collections; 27 import java.util.Set; 28 import java.util.concurrent.ConcurrentHashMap; 29 30 /** Listens for and caches car dock state. */ 31 class DockManager { 32 interface Listener { onDockChanged(boolean isDocked)33 void onDockChanged(boolean isDocked); 34 } 35 36 /** Receiver for car dock plugged and unplugged events. */ 37 private class DockBroadcastReceiver extends BroadcastReceiver { 38 @Override onReceive(Context context, Intent intent)39 public void onReceive(Context context, Intent intent) { 40 if (Intent.ACTION_DOCK_EVENT.equals(intent.getAction())) { 41 int dockState = intent.getIntExtra( 42 Intent.EXTRA_DOCK_STATE, Intent.EXTRA_DOCK_STATE_UNDOCKED); 43 onDockChanged(dockState); 44 } 45 } 46 } 47 48 private final DockBroadcastReceiver mReceiver; 49 50 /** 51 * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is 52 * load factor before resizing, 1 means we only expect a single thread to 53 * access the map so make only a single shard 54 */ 55 private final Set<Listener> mListeners = Collections.newSetFromMap( 56 new ConcurrentHashMap<Listener, Boolean>(8, 0.9f, 1)); 57 58 private int mDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED; 59 DockManager(Context context)60 DockManager(Context context) { 61 mReceiver = new DockBroadcastReceiver(); 62 63 // Register for misc other intent broadcasts. 64 IntentFilter intentFilter = new IntentFilter(Intent.ACTION_DOCK_EVENT); 65 context.registerReceiver(mReceiver, intentFilter); 66 } 67 addListener(Listener listener)68 void addListener(Listener listener) { 69 mListeners.add(listener); 70 } 71 removeListener(Listener listener)72 void removeListener(Listener listener) { 73 if (listener != null) { 74 mListeners.remove(listener); 75 } 76 } 77 isDocked()78 boolean isDocked() { 79 switch (mDockState) { 80 case Intent.EXTRA_DOCK_STATE_DESK: 81 case Intent.EXTRA_DOCK_STATE_HE_DESK: 82 case Intent.EXTRA_DOCK_STATE_LE_DESK: 83 case Intent.EXTRA_DOCK_STATE_CAR: 84 return true; 85 default: 86 return false; 87 } 88 } 89 onDockChanged(int dockState)90 private void onDockChanged(int dockState) { 91 if (mDockState != dockState) { 92 Log.v(this, "onDockChanged: is docked?%b", dockState == Intent.EXTRA_DOCK_STATE_CAR); 93 mDockState = dockState; 94 for (Listener listener : mListeners) { 95 listener.onDockChanged(isDocked()); 96 } 97 } 98 } 99 100 /** 101 * Dumps the state of the {@link DockManager}. 102 * 103 * @param pw The {@code IndentingPrintWriter} to write the state to. 104 */ dump(IndentingPrintWriter pw)105 public void dump(IndentingPrintWriter pw) { 106 pw.println("mIsDocked: " + isDocked()); 107 } 108 } 109