AccelerationWS.java

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package com.buglabs.bug.module.lcd;

import java.util.List;

import org.osgi.service.log.LogService;

import com.buglabs.bug.accelerometer.pub.AccelerometerSample;
import com.buglabs.bug.accelerometer.pub.IAccelerometerSampleProvider;
import com.buglabs.services.ws.IWSResponse;
import com.buglabs.services.ws.PublicWSDefinition;
import com.buglabs.services.ws.PublicWSProvider2;
import com.buglabs.services.ws.WSResponse;
import com.buglabs.util.xml.XmlNode;

/**
 * A web service for acceleration data.
 * @author kgilmer
 *
 */
public class AccelerationWS implements PublicWSProvider2 {
	private IAccelerometerSampleProvider acc;
	private final LogService log;
	private String serviceName = "Acceleration";

	public AccelerationWS(IAccelerometerSampleProvider acc, LogService log) {
		this.acc = acc;
		this.log = log;
	}

	public PublicWSDefinition discover(int operation) {
		if (operation == PublicWSProvider2.GET) {
			return new PublicWSDefinition() {

				public List getParameters() {
					return null;
				}

				public String getReturnType() {
					return "text/xml";
				}
			};
		}

		return null;
	}

	public IWSResponse execute(int operation, String input) {
		if (operation == PublicWSProvider2.GET) {
			return new WSResponse(getAccelerationXml(), "text/xml");
		}
		return null;
	}

	private Object getAccelerationXml() {
		XmlNode root = new XmlNode("Acceleration");
		try {
			XmlNode sample = new XmlNode("sample");
			AccelerometerSample accSample = acc.readSample();

			if (accSample != null) {
				// x y z
				sample.addAttribute("x", Float.toString(accSample.getAccelerationX()));
				sample.addAttribute("y", Float.toString(accSample.getAccelerationY()));
				sample.addAttribute("z", Float.toString(accSample.getAccelerationZ()));

				root.addChild(sample);
			}
		} catch (Exception e) {
			log.log(LogService.LOG_ERROR, "Error occurred while geting acceleration XML.", e);
			return null;
		} 

		return root.toString();
	}

	public String getDescription() {
		return "Returns a sample from the accelerometer";
	}

	public String getPublicName() {
		return serviceName;
	}

	public void setPublicName(String name) {
		serviceName = name;
	}
}