LightContext.java

/*
 * Copyright (C) 2014 The Context Engine Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package uk.ac.tvu.mdse.contextengine.contexts;

import uk.ac.tvu.mdse.contextengine.ListenerComponent;
import uk.ac.tvu.mdse.contextengine.reasoning.ContextValues;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;

public class LightContext extends ListenerComponent implements
		SensorEventListener {

	// Attributes
	private static final long serialVersionUID = -8230486605325209599L;
	public static final String LOG_TAG = "LightContext";
	public static final boolean D = true;

	// Will be kept incase of future "default" values.
	/*
	 * private static final double HIGH_LUM_VALUE = 180; private static final
	 * double MEDIUM_LUM_VALUE = 100;
	 */
	private String lastC;

	public LightContext(Context c) {

		super("LightContext", c, Sensor.TYPE_LIGHT,
				SensorManager.SENSOR_DELAY_NORMAL);
		if (D)
			Log.d(LOG_TAG, "constructor");
		// this.contextInformation = obtainContextInformation(sensorManager);
		// Log.d("LightContext", this.contextInformation);
	}

	protected String obtainContextInformation(SensorManager sm) {
		if (D)
			Log.d(LOG_TAG, "obtainContextInformation");
		// should obtain real light
		// for demo using HIGH as the obtained one
		lastC = "MEDIUM";
		return "MEDIUM";
	}

	public void checkContext(SensorEvent data) {
		if (D)
			Log.d(LOG_TAG, "checkContext");
		int v = (int) data.values[0];

		for (ContextValues cv : this.valuesSets) {
			if (cv.setNewContextValue(v))
				sendNotification(cv);
		}

		// double v = data.values[0];
		// send context value - 2nd approach
		// String highContext = this.getContextInformation(v);
		// Log.d("LightContext", "newValue" + v +" "+highContext);
		// if(!contextInformation.equalsIgnoreCase(lastC)){
		// lastC=highContext;
		// sendNotification();
		// Log.d("LightContext", "newValue set ".concat(contextInformation));
		// }
	}
}