to make it clear,
inside the handleNavigation(...) you can do soemthing like this, to
override the default behavior:
...
@Override
public void handleNavigation(FacesContext context, String fromAction,
String outcome) {
if("home".equals(outcome))
{
String viewId ="/start.xhtml";
UIViewRoot root = context
.getApplication().getViewHandler()
.createView(context, viewId);
FacesContext.getCurrentInstance().setViewRoot(root);
}
//no "home" called, use base one...
else
{
_base.handleNavigation(context, fromAction, outcome);
}
}
...
a commandButton like
<h:commandButton .... action="home" /> would navigate to the hard
coded page "start.xhtml"
(just as an example)
-M
On 8/1/07, Matthias Wessendorf <[EMAIL PROTECTED]> 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
>
--
Matthias Wessendorf
further stuff:
blog: http://matthiaswessendorf.wordpress.com/
mail: matzew-at-apache-dot-org
