/**
	 * Pass the event to all the {@link ILayerListener} registered on this layer.
	 * A cloned copy is passed to each listener.
	 */
	public void fireLayerEvent(ILayerEvent event) {
		if (listeners.size() > 0) {
			Iterator<ILayerListener> it = listeners.iterator();
			boolean isLastListener = false;
			do {
				ILayerListener l = it.next();
				isLastListener = !it.hasNext();  // Lookahead
				
				// Fire cloned event to first n-1 listeners; fire original event to last listener
				ILayerEvent eventToFire = isLastListener ? event : event.cloneEvent();
				l.handleLayerEvent(eventToFire);
			} while (!isLastListener);
		}
	}