Class explanation

[mcal]

Hey guys, i have a problem with this class. I can't understand exactly what is really doing. Can someone pls help me understand it? Thanks a lot.

This is the code:

Code:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
 
import javax.swing.event.EventListenerList;
 
public class ActionSupport {
 
	protected EventListenerList listenerList = new EventListenerList();
	private Object bean;
 
	public ActionSupport(Object registeredBean) {
		this.bean = registeredBean;
	}
 
	public void fireActionPerformed(String actionCommand) {
		
		Object[] listeners = listenerList.getListenerList();
		ActionEvent e = null;
		
		for (int i = listeners.length - 2; i >= 0; i -= 2) {
			if (listeners[i] == ActionListener.class) {
				e = new ActionEvent(bean, ActionEvent.ACTION_PERFORMED, actionCommand, Calendar.getInstance().getTimeInMillis(), 0);
				((ActionListener) listeners[i + 1]).actionPerformed(e);
			}
		}
	}
 
	public void addActionListener(ActionListener l) {
		listenerList.add(ActionListener.class, l);
	}
 
	public void removeActionListener(ActionListener l) {
		listenerList.remove(ActionListener.class, l);
	}
}

[roots]

It is multiplexing the callback to more than one classes . Different listeners can be registered to this class and when the action is triggered this class calls all the listeners.