ExposureVirtualSensor.java

package tinygsn.model.vsensor;

import org.epfl.locationprivacy.util.Utils;

import java.io.Serializable;
import java.util.ArrayList;

import tinygsn.beans.DataField;
import tinygsn.beans.DataTypes;
import tinygsn.beans.StaticData;
import tinygsn.beans.StreamElement;

import static android.os.Debug.startMethodTracing;
import static android.os.Debug.stopMethodTracing;

public class ExposureVirtualSensor extends AbstractVirtualSensor {


	private static final long serialVersionUID = -3819903462891465980L;

	private ArrayList<StreamElement> buffer = new ArrayList<StreamElement>();

	private DataField[] outputStructure = new DataField[]{new DataField("exposure",DataTypes.DOUBLE),new DataField("start",DataTypes.BIGINT),new DataField("end",DataTypes.BIGINT)};

	private String LOGTAG = "ExposureVirtualSensor";

	@Override
	public boolean initialize() {

		return true;
	}

	@Override
	public void dispose() {
	}

	@Override
	public DataField[] getOutputStructure(DataField[] in){
		return outputStructure;
	}

	@Override
	public void dataAvailable(String inputStreamName, StreamElement streamElement) {

		if ((boolean) Utils.getBuildConfigValue(StaticData.globalContext, "PERFORMANCE")) {
			startMethodTracing("Android/data/tinygsn.gui.android/" + LOGTAG + "_" + inputStreamName + "_" + System.currentTimeMillis());
		}
		log("dataAvailable_" + LOGTAG + "_" + inputStreamName, "===========================================");
		log("dataAvailable_" + LOGTAG + "_" + inputStreamName, "Starting to process data in dataAvailable");
		long startLogTime = System.currentTimeMillis();

		streamElement = super.anonymizeData(inputStreamName, streamElement);

		if(inputStreamName.endsWith("MET")){
			double va = (Double)streamElement.getData("VA");
			long s = ((Double)streamElement.getData("start")).longValue();
			long e = ((Double)streamElement.getData("end")).longValue();

			double sum = 0.0;
			for (StreamElement se:buffer){
				sum += ((Double)se.getData("o3"))/1000.0;
			}
			if (buffer.size()>0)
			    sum /= 1.0*buffer.size();
			double exposure = va * sum * (e-s)/60000.0;

			long endLogTime = System.currentTimeMillis();
			log("dataAvailable_" + LOGTAG + "_" + inputStreamName, "Total Time to process data in dataAvailable() (without dataProduced()) : " + (endLogTime - startLogTime) + " ms.");

			dataProduced(new StreamElement(outputStructure, new Serializable[]{exposure,s,e}, streamElement.getTimeStamp()));
			buffer.clear();
		}else{
			buffer.add(streamElement);
		}
		if ((boolean) Utils.getBuildConfigValue(StaticData.globalContext, "PERFORMANCE") || (boolean) Utils.getBuildConfigValue(StaticData.globalContext, "GPSPERFORMANCE")) {
			stopMethodTracing();
		}
	}

}