de.mhus.lib.core

Class MEventHandler<L>

java.lang.Object

de.mhus.lib.core.MLog

de.mhus.lib.core.MEventHandler<L>

All Implemented Interfaces:

ILog

Direct Known Subclasses:

MObserverHandler

public class MEventHandler<L>
extends MLog

MEventHandler class.

Version:

$Id: $Id

Author:

mikehummel

Constructor Summary

Constructors

Constructor and Description
MEventHandler() Create the handler in normal mode.
MEventHandler(boolean weakHandler) Create the handler and specify if all listeners have to be weak.

Method Summary

Modifier and Type	Method and Description
boolean	contains(L listener) Returns true if the listener instance is already registered for this event handler.
void	fire(Method method, Object... values) fire.
Iterable<L>	getListeners() Use this to iterate into the listeners and if you be sure the listeners do not try to change the event handler (register/unregister).
Object[]	getListenersArray() Returns a array of all registered (normal or weak) listeners.
boolean	isWeakHandler() Return true if the handler only store weak references (also by register()).
void	register(L listener) Register a listener for this kind of events.
void	registerWeak(L listener) Register the listener as a weak reference.
int	size() Amount of registered listeners.
void	unregister(L listener) Unregister normal or weak listener from the handler.

Methods inherited from class de.mhus.lib.core.MLog

log

Methods inherited from class java.lang.Object

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

Constructor Detail

MEventHandler

public MEventHandler()

Create the handler in normal mode.

MEventHandler

public MEventHandler(boolean weakHandler)

Create the handler and specify if all listeners have to be weak.

Parameters:

weakHandler - If true handler is in weak mode. All registered handlers are weak.

Method Detail

register

public void register(L listener)

Register a listener for this kind of events. If the handler is weak the listener will registered weak. A listener can only register one time. A second registration will be ignored.

Parameters:

listener - Listener for the events.

unregister

public void unregister(L listener)

Unregister normal or weak listener from the handler.

Parameters:

listener - Listener for the events.

registerWeak

public void registerWeak(L listener)

Register the listener as a weak reference.

Parameters:

listener - Listener for the events.

contains

public boolean contains(L listener)

Returns true if the listener instance is already registered for this event handler.

Parameters:

listener - Listener for the events.

Returns:

true if the listener is registered as normal or weak.

getListenersArray

public Object[] getListenersArray()

Returns a array of all registered (normal or weak) listeners. The list should not be cashed - this will prevent weak listeners to be removed from the memory. The list should be used to fire events to the listeners if the listeners are able to change the event handler (register / unregister).

Returns:

All registered listeners

getListeners

public Iterable<L> getListeners()

Use this to iterate into the listeners and if you be sure the listeners do not try to change the event handler (register/unregister). This method will save resources if only normal or only weak listeners are registered.

Returns:

Iterable object for all listeners.

size

public int size()

Amount of registered listeners.

Returns:

a int.

isWeakHandler

public boolean isWeakHandler()

Return true if the handler only store weak references (also by register()).

Returns:

flag

fire

public void fire(Method method,
                 Object... values)

fire.

Parameters:

method - a Method object.

values - a Object object.