Package org.zkoss.zk.ui.util

Interface InitiatorExt

All Known Implementing Classes:

Composition, GenericInitiator

public interface InitiatorExt

An extra interface that can be implemented with Initiator to have the better control.

Since:

3.0.0

Author:

tomyeh

See Also:

• Initiator

Method Summary

Modifier and Type	Method	Description
void	doAfterCompose(Page page, Component[] comps)	Called after all components are created (a.k.a., composed), and before any event is processed.
boolean	doCatch(Throwable ex)	Called when an exception occurs during the evaluation of the page.
void	doFinally()	Do the cleanup after the page has been evaluated.

Method Details

doAfterCompose

void doAfterCompose(Page page,
 Component[] comps)
             throws Exception

Called after all components are created (a.k.a., composed), and before any event is processed.

It won't be called if an un-caught exception occurs when creating components.

Parameters:

page - the page that new components are attached to. It is the same as Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map<java.lang.String, java.lang.Object>)'s page argument.

comps - the root components being created (never null, but the length might be zero). Note: It is not necessary the same as Page.getRoots(), since this method might be called thru Executions.createComponents(java.lang.String, org.zkoss.zk.ui.Component, java.util.Map<?, ?>).

Throws:

Exception

Since:

3.0.0

doCatch

boolean doCatch(Throwable ex)
         throws Exception

Called when an exception occurs during the evaluation of the page.

If you don't want to handle the exception, simply returns false. boolean doCatch(Throwable ex) {return false;}

An exception thrown in this method is simply logged. It has no effect on the execution. If you want to ignore the exception, just return true.

Notice: this method won't be called if the exception occurs in Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map<java.lang.String, java.lang.Object>).

Parameters:

ex - the exception being thrown

Returns:

whether to ignore the exception. If false is returned, the exception will be re-thrown. Note: once an initiator's doCatch returns true, the exception will be ignored and it means doCatch of the following initiators won't be called. Prior to ZK 3.0.0, void is returned and it means always re-thrown

Throws:

Exception

doFinally

void doFinally()
        throws Exception

Do the cleanup after the page has been evaluated. It won't be called if Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map<java.lang.String, java.lang.Object>) throws an exception. However,it is always called no matter whether doCatch(java.lang.Throwable) is called.

An exception thrown in this method is simply logged. It has no effect on the execution.

Throws:

Exception