1/*
2 * Copyright (C) 2014 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
17package com.android.server.policy;
18
19import android.os.Handler;
20import android.content.Context;
21import android.hardware.Sensor;
22import android.hardware.SensorManager;
23import android.hardware.TriggerEvent;
24import android.hardware.TriggerEventListener;
25
26import java.io.PrintWriter;
27
28/**
29 * Watches for wake gesture sensor events then invokes the listener.
30 */
31public abstract class WakeGestureListener {
32    private static final String TAG = "WakeGestureListener";
33
34    private final SensorManager mSensorManager;
35    private final Handler mHandler;
36
37    private final Object mLock = new Object();
38
39    private boolean mTriggerRequested;
40    private Sensor mSensor;
41
42    public WakeGestureListener(Context context, Handler handler) {
43        mSensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
44        mHandler = handler;
45
46        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_WAKE_GESTURE);
47    }
48
49    public abstract void onWakeUp();
50
51    public boolean isSupported() {
52        synchronized (mLock) {
53            return mSensor != null;
54        }
55    }
56
57    public void requestWakeUpTrigger() {
58        synchronized (mLock) {
59            if (mSensor != null && !mTriggerRequested) {
60                mTriggerRequested = true;
61                mSensorManager.requestTriggerSensor(mListener, mSensor);
62            }
63        }
64    }
65
66    public void cancelWakeUpTrigger() {
67        synchronized (mLock) {
68            if (mSensor != null && mTriggerRequested) {
69                mTriggerRequested = false;
70                mSensorManager.cancelTriggerSensor(mListener, mSensor);
71            }
72        }
73    }
74
75    public void dump(PrintWriter pw, String prefix) {
76        synchronized (mLock) {
77            pw.println(prefix + TAG);
78            prefix += "  ";
79            pw.println(prefix + "mTriggerRequested=" + mTriggerRequested);
80            pw.println(prefix + "mSensor=" + mSensor);
81        }
82    }
83
84    private final TriggerEventListener mListener = new TriggerEventListener() {
85        @Override
86        public void onTrigger(TriggerEvent event) {
87            synchronized (mLock) {
88                mTriggerRequested = false;
89                mHandler.post(mWakeUpRunnable);
90            }
91        }
92    };
93
94    private final Runnable mWakeUpRunnable = new Runnable() {
95        @Override
96        public void run() {
97            onWakeUp();
98        }
99    };
100}
101