org.apache.fop.events

Class CompositeEventListener

java.lang.Object

org.apache.fop.events.CompositeEventListener

All Implemented Interfaces:

EventListener

public class CompositeEventListener
extends Object
implements EventListener

EventListener implementation forwards events to possibly multiple other EventListeners.

Constructor Summary

Constructors

Constructor and Description
CompositeEventListener()

Method Summary

Methods

Modifier and Type	Method and Description
void	addEventListener(EventListener listener) Adds an event listener to the broadcaster.
boolean	hasEventListeners() Indicates whether any listeners have been registered with the broadcaster.
void	processEvent(Event event) This method is called for each event that is generated.
void	removeEventListener(EventListener listener) Removes an event listener from the broadcaster.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CompositeEventListener

public CompositeEventListener()

Method Detail

addEventListener

public void addEventListener(EventListener listener)

Adds an event listener to the broadcaster. It is appended to the list of previously registered listeners (the order of registration defines the calling order).

Parameters:

listener - the listener to be added

removeEventListener

public void removeEventListener(EventListener listener)

Removes an event listener from the broadcaster. If the event listener is not registered, nothing happens.

Parameters:

listener - the listener to be removed

hasEventListeners

public boolean hasEventListeners()

Indicates whether any listeners have been registered with the broadcaster.

Returns:

true if listeners are present, false otherwise

processEvent

public void processEvent(Event event)

This method is called for each event that is generated. With the event's ID it is possible to react to certain events. Events can also simply be recorded and presented to a user. It is possible to throw an (unchecked) exception if the processing needs to be aborted because some special event occurred. This way the client can configure the behaviour of the observed application.

Parameters:

event - the event