Pavel Maltsev | 1ecdd6c | 2016-03-02 16:33:44 -0800 | [diff] [blame^] | 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 | package com.android.car.cluster.renderer; |
| 17 | |
| 18 | import android.annotation.Nullable; |
| 19 | import android.car.cluster.renderer.NavigationRenderer; |
| 20 | import android.graphics.Bitmap; |
| 21 | import android.os.Handler; |
| 22 | import android.os.Looper; |
| 23 | import android.os.Message; |
| 24 | |
| 25 | /** |
| 26 | * A wrapper over {@link NavigationRenderer} that runs all its methods in the context of provided |
| 27 | * looper. It is guaranteed that all calls will be invoked in order they were called. |
| 28 | */ |
| 29 | public class ThreadSafeNavigationRenderer extends NavigationRenderer { |
| 30 | |
| 31 | private final Handler mHandler; |
| 32 | |
| 33 | private final static int MSG_NAV_START = 1; |
| 34 | private final static int MSG_NAV_STOP = 2; |
| 35 | private final static int MSG_NAV_NEXT_TURN = 3; |
| 36 | private final static int MSG_NAV_NEXT_TURN_DISTANCE = 4; |
| 37 | |
| 38 | /** Creates thread-safe {@link NavigationRenderer}. Returns null if renderer == null */ |
| 39 | @Nullable |
| 40 | public static NavigationRenderer createFor(Looper looper, NavigationRenderer renderer) { |
| 41 | return renderer == null ? null : new ThreadSafeNavigationRenderer(looper, renderer); |
| 42 | } |
| 43 | |
| 44 | private ThreadSafeNavigationRenderer(Looper looper, NavigationRenderer renderer) { |
| 45 | mHandler = new NavigationRendererHandler(looper, renderer); |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | public void onStartNavigation() { |
| 50 | mHandler.sendMessage(mHandler.obtainMessage(MSG_NAV_START)); |
| 51 | } |
| 52 | |
| 53 | @Override |
| 54 | public void onStopNavigation() { |
| 55 | mHandler.sendMessage(mHandler.obtainMessage(MSG_NAV_STOP)); |
| 56 | } |
| 57 | |
| 58 | @Override |
| 59 | public void onNextTurnChanged(int event, String road, int turnAngle, int turnNumber, |
| 60 | Bitmap image, int turnSide) { |
| 61 | mHandler.sendMessage(mHandler.obtainMessage(MSG_NAV_NEXT_TURN, |
| 62 | new NextTurn(event, road, turnAngle, turnNumber, image, turnSide))); |
| 63 | } |
| 64 | |
| 65 | @Override |
| 66 | public void onNextTurnDistanceChanged(int distanceMeters, int timeSeconds) { |
| 67 | mHandler.sendMessage(mHandler.obtainMessage( |
| 68 | MSG_NAV_NEXT_TURN_DISTANCE, distanceMeters, timeSeconds)); |
| 69 | } |
| 70 | |
| 71 | private static class NavigationRendererHandler extends RendererHandler<NavigationRenderer> { |
| 72 | |
| 73 | NavigationRendererHandler(Looper looper, NavigationRenderer renderer) { |
| 74 | super(looper, renderer); |
| 75 | } |
| 76 | |
| 77 | @Override |
| 78 | public void handleMessage(Message msg, NavigationRenderer renderer) { |
| 79 | |
| 80 | switch (msg.what) { |
| 81 | case MSG_NAV_START: |
| 82 | renderer.onStartNavigation(); |
| 83 | break; |
| 84 | case MSG_NAV_STOP: |
| 85 | renderer.onStopNavigation(); |
| 86 | break; |
| 87 | case MSG_NAV_NEXT_TURN: |
| 88 | NextTurn nt = (NextTurn) msg.obj; |
| 89 | renderer.onNextTurnChanged(nt.event, nt.road, nt.turnAngle, nt.turnNumber, |
| 90 | nt.bitmap, nt.turnSide); |
| 91 | break; |
| 92 | case MSG_NAV_NEXT_TURN_DISTANCE: |
| 93 | renderer.onNextTurnDistanceChanged(msg.arg1, msg.arg2); |
| 94 | break; |
| 95 | default: |
| 96 | throw new IllegalArgumentException("Msg: " + msg.what); |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | private static class NextTurn { |
| 102 | private final int event; |
| 103 | private final String road; |
| 104 | private final int turnAngle; |
| 105 | private final int turnNumber; |
| 106 | private final Bitmap bitmap; |
| 107 | private final int turnSide; |
| 108 | |
| 109 | NextTurn(int event, String road, int turnAngle, int turnNumber, Bitmap bitmap, |
| 110 | int turnSide) { |
| 111 | this.event = event; |
| 112 | this.road = road; |
| 113 | this.turnAngle = turnAngle; |
| 114 | this.turnNumber = turnNumber; |
| 115 | this.bitmap = bitmap; |
| 116 | this.turnSide = turnSide; |
| 117 | } |
| 118 | } |
| 119 | } |