Package org.pentaho.reporting.libraries.designtime.swing

Class WeakEventListenerList

java.lang.Object

org.pentaho.reporting.libraries.designtime.swing.WeakEventListenerList

public class WeakEventListenerList
extends Object

An event listener list that stores the listeners as weak references. This list behaves like the EventListenerList, but does not create the risk of memory leaks when maintaining listener lists for global objects.

The list is fully synchronized and safe to be used in multi-threading environments.

Author:

Thomas Morgner

Constructor Summary

Constructors

Constructor	Description
WeakEventListenerList()	Creates a new listener list with a increment of 10.

Method Summary

Modifier and Type	Method	Description
<T extends EventListener> void	add(Class<T> t, T l)	Adds a new listener of the given type to this list.
int	getListenerCount(Class<?> t)	Counts the number of listeners of a given type that are contained in this list.
<T extends EventListener> T[]	getListeners(Class<T> t)	Returns all listeners of the given type that are stored in this list.
int	getSize()	Returns the number of listeners of any type stored in this eventlistener list.
<T extends EventListener> void	remove(Class<T> t, T l)	Removes an existing listener of the given type from this eventlistener list.

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakEventListenerList

public WeakEventListenerList()

Creates a new listener list with a increment of 10.

Method Detail

add

public <T extends EventListener> void add(Class<T> t,
                                          T l)

Adds a new listener of the given type to this list.

Type Parameters:

T - the type of the listener, must be a subclass of java.util.EventListener.

Parameters:

t - the type of the listener.

l - the listener.

remove

public <T extends EventListener> void remove(Class<T> t,
                                             T l)

Removes an existing listener of the given type from this eventlistener list.

Type Parameters:

T - the type of the listener, must be a subclass of java.util.EventListener.

Parameters:

t - the type of the listener.

l - the listener.

getSize

public int getSize()

Returns the number of listeners of any type stored in this eventlistener list.

Returns:

the overall size of this list.

getListenerCount

public int getListenerCount(Class<?> t)

Counts the number of listeners of a given type that are contained in this list.

Parameters:

t - the type of the listener.

Returns:

the number of listeners.

getListeners

public <T extends EventListener> T[] getListeners(Class<T> t)

Returns all listeners of the given type that are stored in this list.

Type Parameters:

T - a implementation or derived interface of EventListener.

Parameters:

t - the type of the listener to be retrieved.

Returns:

the array containing all listeners.