Package com.itextpdf.commons.actions

Class EventManager

java.lang.Object

com.itextpdf.commons.actions.EventManager

public final class EventManager
extends java.lang.Object

Entry point for event handling mechanism. Class is a singleton, see getInstance().

Field Summary

Fields

Modifier and Type	Field	Description
private ConcurrentHashSet<IEventHandler>	handlers
private static EventManager	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	EventManager()

Method Summary

Modifier and Type	Method	Description
static void	acknowledgeAgplUsageDisableWarningMessage()	Deliberately turns off the warning message about AGPL usage.
static EventManager	getInstance()	Allows access to the instance of EventManager.
boolean	isRegistered(IEventHandler handler)	Check if the handler was registered for event handling process.
void	onEvent(IEvent event)	Handles the event.
void	register(IEventHandler handler)	Add new IEventHandler to the event handling process.
boolean	unregister(IEventHandler handler)	Removes handler from event handling process.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

private static final EventManager INSTANCE

handlers

private final ConcurrentHashSet<IEventHandler> handlers

Constructor Detail

EventManager

private EventManager()

Method Detail

getInstance

public static EventManager getInstance()

Allows access to the instance of EventManager.

Returns:

the instance of the class

acknowledgeAgplUsageDisableWarningMessage

public static void acknowledgeAgplUsageDisableWarningMessage()

Deliberately turns off the warning message about AGPL usage.

Important note. Calling of this method means that the terms of AGPL license are met.

onEvent

public void onEvent(IEvent event)

Handles the event.

Parameters:

event - to handle

register

public void register(IEventHandler handler)

Add new IEventHandler to the event handling process.

Parameters:

handler - is a handler to add

isRegistered

public boolean isRegistered(IEventHandler handler)

Check if the handler was registered for event handling process.

Parameters:

handler - is a handler to check

Returns:

true if handler has been already registered and false otherwise

unregister

public boolean unregister(IEventHandler handler)

Removes handler from event handling process.

Parameters:

handler - is a handle to remove

Returns:

true if the handler had been registered previously and was removed. False if the handler was not found among registered handlers