Thank you ... that helps... Michael
Matthias Wessendorf-4 wrote:
>
> On 8/1/07, MichaelWa <[EMAIL PROTECTED]> wrote:
>>
>> Can someone help me to understand the following piece of code.
>> 1. I noticed that JSF will call NavigationHandlerImpl(NavigationHandler
>> base) constructor instead of default NavigationHandlerImpl() why?
>> 2. JSF also will send the instance of NavigationHandlerImpl as parameter
>> when it calls constructor NavigationHandlerImpl(NavigationHandler base),
>> why?
>
> decorator pattern is used.
> every jsf-impl has a default impl. of the abstract navhandler class.
> the used one is "pushed" into your custom.
>
> that allows you to *delegate* back to the default, in case of there is
> something that
> you thnk the base does
> use-cases:
> Spring-Web-Flow / Shale: Dialog-Framework
>
>> 3.More intersted is this piece of code will handle navigation correctly
>> (just like default NavigationHandler) if I config it into my JSF
>> application, why?
>
> not sure I get it...
> but you are doing nothing in here.
> just *delegating* to the default one (base one)
>
> -M
>
>>
>> Here is the code:
>>
>> import javax.faces.application.NavigationHandler;
>> import javax.faces.context.FacesContext;
>>
>> public class NavigationHandlerImpl extends NavigationHandler {
>>
>> NavigationHandler _base;
>>
>> public NavigationHandlerImpl(NavigationHandler base){
>> super();
>> _base = base;
>> }
>>
>> public NavigationHandlerImpl(){
>> super();
>> }
>>
>> @Override
>> public void handleNavigation(FacesContext fc, String
>> actionMethod, String
>> actionName) {
>> _base.handleNavigation(fc, actionMethod, actionName);
>> }
>>
>> }
>>
>>
>> here is my configutation:
>>
>> <application>
>>
>> <navigation-handler>com.abc.web.nav.NavigationHandlerImpl</navigation-handler>
>> </application>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/NavigationHandler-tf4200242.html#a11946094
>> Sent from the MyFaces - Users mailing list archive at Nabble.com.
>>
>>
>
>
> --
> Matthias Wessendorf
>
> further stuff:
> blog: http://matthiaswessendorf.wordpress.com/
> mail: matzew-at-apache-dot-org
>
>
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