AsyncEventSupport.java

package com.dragome.forms.bindings.client.command;

import com.dragome.forms.bindings.client.channel.Channel;

/**
 * 
 */
public class AsyncEventSupport<R, E>
{
	private AsyncEventsImpl<R, E> alwaysEvents= new AsyncEventsImpl<R, E>();
	private AsyncEventsImpl<R, E> onNextCallEvents;

	public AsyncEvents<R, E> onNextCall()
	{
		if (onNextCallEvents == null)
		{
			onNextCallEvents= new AsyncEventsImpl();
		}
		return onNextCallEvents;
	}

	public AsyncEvents<R, E> always()
	{
		return alwaysEvents;
	}

	public Trigger prepareEvents()
	{
		Trigger trigger= new Trigger(alwaysEvents, onNextCallEvents);
		onNextCallEvents= null;
		return trigger;
	}

	protected Channel<R> getResultChannel()
	{
		return alwaysEvents.getResultChannel();
	}

	protected Channel<E> getErrorChannel()
	{
		return alwaysEvents.getErrorChannel();
	}

	public class Trigger
	{
		AsyncEventsImpl<R, E>[] events;

		public Trigger(AsyncEventsImpl<R, E>... events)
		{
			this.events= events;
		}

		public void fireStart()
		{
			for (AsyncEventsImpl<R, E> event : events)
			{
				if (event != null)
				{
					event.fireStart();
				}
			}
		}

		public void fireSuccess(R result)
		{
			for (AsyncEventsImpl<R, E> event : events)
			{
				if (event != null)
				{
					event.fireSuccess(result);
				}
			}
		}

		public void fireError(E error)
		{
			for (AsyncEventsImpl<R, E> event : events)
			{
				if (event != null)
				{
					event.fireError(error);
				}
			}
		}

		public void fireFinished()
		{
			for (AsyncEventsImpl<R, E> event : events)
			{
				if (event != null)
				{
					event.fireFinish();
				}
			}

		}
	}

}