edu.mit.media.funf.probe.builtin.SensorProbe.java Source code

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Here is the source code for edu.mit.media.funf.probe.builtin.SensorProbe.java

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/**
 * 
 * Funf: Open Sensing Framework
 * Copyright (C) 2010-2011 Nadav Aharony, Wei Pan, Alex Pentland.
 * Acknowledgments: Alan Gardner
 * Contact: nadav@media.mit.edu
 * 
 * This file is part of Funf.
 * 
 * Funf is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 * 
 * Funf is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with Funf. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package edu.mit.media.funf.probe.builtin;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import edu.mit.media.funf.Schedule;
import edu.mit.media.funf.config.Configurable;
import edu.mit.media.funf.probe.Probe.Base;
import edu.mit.media.funf.probe.Probe.ContinuousProbe;
import edu.mit.media.funf.probe.builtin.ProbeKeys.SensorKeys;
import edu.mit.media.funf.time.TimeUtil;
import edu.mit.media.funf.util.LogUtil;

@Schedule.DefaultSchedule(interval = SensorProbe.DEFAULT_PERIOD, duration = SensorProbe.DEFAULT_DURATION)
public abstract class SensorProbe extends Base implements ContinuousProbe, SensorKeys {

    public static final double DEFAULT_PERIOD = 3600;
    public static final double DEFAULT_DURATION = 60;

    @Configurable
    private String sensorDelay = SENSOR_DELAY_FASTEST;

    public static final String SENSOR_DELAY_FASTEST = "FASTEST", SENSOR_DELAY_GAME = "GAME", SENSOR_DELAY_UI = "UI",
            SENSOR_DELAY_NORMAL = "NORMAL";

    private SensorManager sensorManager;
    private Sensor sensor;
    private SensorEventListener sensorListener;

    @Override
    protected void onEnable() {
        super.onEnable();
        sensorManager = (SensorManager) getContext().getSystemService(Context.SENSOR_SERVICE);
        sensor = sensorManager.getDefaultSensor(getSensorType());
        final String[] valueNames = getValueNames();
        sensorListener = new SensorEventListener() {

            @Override
            public void onSensorChanged(SensorEvent event) {
                JsonObject data = new JsonObject();
                data.addProperty(TIMESTAMP, TimeUtil.uptimeNanosToTimestamp(event.timestamp));
                data.addProperty(ACCURACY, event.accuracy);
                int valuesLength = Math.min(event.values.length, valueNames.length);
                for (int i = 0; i < valuesLength; i++) {
                    String valueName = valueNames[i];
                    data.addProperty(valueName, event.values[i]);
                }
                sendData(data);
            }

            @Override
            public void onAccuracyChanged(Sensor sensor, int accuracy) {
            }
        };
    }

    @Override
    protected void onStart() {
        super.onStart();
        getSensorManager().registerListener(sensorListener, sensor, getSensorDelay(sensorDelay));
    }

    @Override
    protected void onStop() {
        getSensorManager().unregisterListener(sensorListener);
    }

    protected SensorManager getSensorManager() {
        if (sensorManager == null) {
            sensorManager = (SensorManager) getContext().getSystemService(Context.SENSOR_SERVICE);
        }
        return sensorManager;
    }

    protected int getSensorDelay(String specifiedSensorDelay) {
        int sensorDelay = -1;
        JsonElement el = getGson().toJsonTree(specifiedSensorDelay);
        if (!el.isJsonNull()) {
            try {
                int sensorDelayInt = el.getAsInt();
                if (sensorDelayInt == SensorManager.SENSOR_DELAY_FASTEST
                        || sensorDelayInt == SensorManager.SENSOR_DELAY_GAME
                        || sensorDelayInt == SensorManager.SENSOR_DELAY_UI
                        || sensorDelayInt == SensorManager.SENSOR_DELAY_NORMAL) {
                    sensorDelay = sensorDelayInt;
                }
            } catch (NumberFormatException e) {
            } catch (ClassCastException e) {
            } catch (IllegalStateException e) {
            }
        }

        if (sensorDelay < 0) {
            try {
                String sensorDelayString = el.getAsString().toUpperCase().replace("SENSOR_DELAY_", "");
                if (SENSOR_DELAY_FASTEST.equals(sensorDelayString)) {
                    sensorDelay = SensorManager.SENSOR_DELAY_FASTEST;
                } else if (SENSOR_DELAY_GAME.equals(sensorDelayString)) {
                    sensorDelay = SensorManager.SENSOR_DELAY_GAME;
                } else if (SENSOR_DELAY_UI.equals(sensorDelayString)) {
                    sensorDelay = SensorManager.SENSOR_DELAY_UI;
                } else if (SENSOR_DELAY_NORMAL.equals(sensorDelayString)) {
                    sensorDelay = SensorManager.SENSOR_DELAY_NORMAL;
                }
            } catch (ClassCastException cce) {
                Log.w(LogUtil.TAG, "Unknown sensor delay value: " + specifiedSensorDelay);
            }
        }

        if (sensorDelay < 0) {
            sensorDelay = SensorManager.SENSOR_DELAY_FASTEST;
        }

        return sensorDelay;
    }

    public abstract int getSensorType();

    public abstract String[] getValueNames();
}