Package org.zkoss.zk.ui.util

Class GenericInitiator

java.lang.Object

org.zkoss.zk.ui.util.GenericInitiator

All Implemented Interfaces:

Initiator, InitiatorExt

public abstract class GenericInitiator
extends Object
implements Initiator, InitiatorExt

A skeletal implementation that provides does-nothing for all methods, such that the deriving class needs only to implement the required method.

Since:

5.0.5

Author:

tomyeh

Constructor Summary

Constructors

Constructor	Description
GenericInitiator()

Method Summary

Modifier and Type	Method	Description
void	doAfterCompose(Page page)	It is used only for backward compatibility.
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)	Does nothing but returns false so the exception will be thrown.
void	doFinally()	Do the cleanup after the page has been evaluated.
void	doInit(Page page, Map<String,Object> args)	Does the initializes before the page is evaluated.

Methods inherited from class java.lang.Object

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

Constructor Details

GenericInitiator

public GenericInitiator()

Method Details

doInit

public void doInit(Page page,
 Map<String,Object> args)
            throws Exception

Description copied from interface: Initiator

Does the initializes before the page is evaluated.

Note: when it is called, Page.getDesktop(), Page.getId() and Page.getTitle() all return null, since the page is not initialized yet. To get the current desktop, you have to use Execution.getDesktop() (from Executions.getCurrent()) instead. On the other hand, you can set the page's ID, title or style in this method (to override the declarations in the page definition) by Page.setId(java.lang.String), Page.setTitle(java.lang.String) and Page.setStyle(java.lang.String). In additions, Page.getRequestPath() and Page.getAttribute(java.lang.String, int) are all available.

Specified by:

doInit in interface Initiator

Parameters:

page - the page being evaluated

args - a map of arguments. Prior to 3.6.2, it is an array. To upgrade, use args.get("arg0") instead of args[0], args.get("arg1") instead of args[1] and so on. Of course, it is better to have a more meaningful name for each argument. If no argument is specified, args is an empty map (never null).

Throws:

Exception

doAfterCompose

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

Description copied from interface: InitiatorExt

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.

Specified by:

doAfterCompose in interface InitiatorExt

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

doAfterCompose

public void doAfterCompose(Page page)

It is used only for backward compatibility. Don't use it.

doCatch

public boolean doCatch(Throwable ex)
                throws Exception

Does nothing but returns false so the exception will be thrown.

Specified by:

doCatch in interface InitiatorExt

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

public void doFinally()
               throws Exception

Description copied from interface: InitiatorExt

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 InitiatorExt.doCatch(java.lang.Throwable) is called.

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

Specified by:

doFinally in interface InitiatorExt

Throws:

Exception