InputEventProvider.java

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package com.buglabs.bug.input.pub;

import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.Iterator;

import org.osgi.service.log.LogService;

import com.buglabs.bug.buttons.ButtonEvent;
import com.buglabs.bug.buttons.IButtonEventListener;
import com.buglabs.bug.buttons.IButtonEventProvider;
import com.buglabs.bug.jni.common.FCNTL_H;
import com.buglabs.bug.jni.input.InputDevice;
import com.buglabs.bug.jni.input.InputEvent;

public class InputEventProvider extends Thread implements IButtonEventProvider {

	private ArrayList listeners;
	private final LogService log;
	private String inputDevice;

	public InputEventProvider(String inputDevice, LogService log) {
		this.log = log;
		listeners = new ArrayList();
		this.inputDevice = inputDevice;
	}

	public void addListener(IButtonEventListener listener) {
		synchronized (listeners) {
			if (!listeners.contains(listener)) {
				listeners.add(listener);
			}
		}
	}

	public void removeListener(IButtonEventListener listener) {
		synchronized (listeners) {
			listeners.remove(listener);
		}
	}

	public void run() {
		log.log(LogService.LOG_DEBUG, this.getClass().getName() + ": Opening input device: " + inputDevice);
		InputDevice dev = new InputDevice();
		if (dev.open(inputDevice, FCNTL_H.O_RDWR) < 0) {
			log.log(LogService.LOG_ERROR, "Unable to open input device: " + inputDevice);
		}

		while (!isInterrupted()) {
			try {
				//block on reading events from JNI
				InputEvent[] inputEvents = dev.readEvents();

				synchronized (listeners) {
					//process each event
					for (int i = 0; i < inputEvents.length; ++i) {
						//get reference to the listners
						Iterator iter = listeners.iterator();
						//create a new ButtonEvent object
						ButtonEvent b = new ButtonEvent(inputEvents[i].code, 0, inputEvents[i].code, convertButtonAction(inputEvents[i].value), this.getClass().toString());
						log.log(LogService.LOG_DEBUG, this.getClass().getName() + ": Input event: " + inputEvents[i].code);
						//for each event, iterate through 
						while (iter.hasNext()) {
							IButtonEventListener l = (IButtonEventListener) iter.next();
							try {
								l.buttonEvent(b);
							} catch (Exception e) {
								log.log(LogService.LOG_ERROR, "Button event client threw an exception.", e);
							}
						}
					}
				}
			} catch (ConcurrentModificationException e) {
				log.log(LogService.LOG_ERROR, "Concurrency issue", e);
			}
		}

		dev.close();
	}

	private long convertButtonAction(long value) {
		if (value == 1) {
			return ButtonEvent.KEY_DOWN;
		}

		if (value == 0) {
			return ButtonEvent.KEY_UP;
		}

		return value;
	}

	public void tearDown() {
		interrupt();
	}
}