oracle.cabo.servlet.event
Class NullEventHandler

java.lang.Object
  |
  +--oracle.cabo.servlet.event.NullEventHandler

All Implemented Interfaces:

EventHandler

public class NullEventHandler

extends java.lang.Object

implements EventHandler

Implementation of a do-nothing EventHandler. This is useful for avoiding UnhandledEventExceptions in debugging code.

Constructor Summary

NullEventHandler()

Method Summary

EventResult	handleEvent(BajaContext context, Page page, PageEvent event) Handle an event.
static EventHandler	sharedInstance() Returns a shared instance of this class.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullEventHandler

public NullEventHandler()

Method Detail

sharedInstance

public static EventHandler sharedInstance()

Returns a shared instance of this class.

handleEvent

public EventResult handleEvent(BajaContext context,
                               Page page,
                               PageEvent event)
                        throws java.lang.Throwable

Description copied from interface: EventHandler

Handle an event. Clients return an EventResult object that encapsulates the resulsts. If handleEvent() returns null, the PageBroker will simply redisplay the same page. Otherwise, the result will be passed to the PageFlowEngine to determine the Page to render.

Note: while the Page object is mutable, any calls that set properties, etc., will be ignored unless the Page is itself returned inside the EventResult.

Specified by:

handleEvent in interface EventHandler

Following copied from interface: oracle.cabo.servlet.event.EventHandler

Parameters:

context - the BajaContext

page - the page the client is requesting

event - the event on that page, or null if the client is just requesting a page display

Returns:

an object encapsulating results of this event

Throws:

java.lang.Throwable - if any processing of the event fails