ie
class MyBookmarkablePage extends WebPage {
public MyBookmarkablePage(PageParameters params) {
...
}
public static MyBookmarkablePage(String p1, int p2, String p3) {
PageParameters params=new PageParameters();
...fill in params...
return new MyBookmarkablePage(params);
}
}
also see IPageLink interface that is used by PageLink class. but i think this is more work, a simple Link's onclick() implementation is the path of least resistance imho.
-Igor
On 11/18/05, Eduardo Rocha <[EMAIL PROTECTED]> wrote:
If it's OK to write a little more code, you could use a factory for
the page with the same signature your constructor uses. In my opinion
this could be more elegant, but what Igor said is simpler. Something
like (not tested):
// reusable class
public interface IPageCreator {
Page newInstance();
}
// reusable class
public class PageCreatorLink extends Link {
public PageCreatorLink(String id, IPageCreator creator) {
super(id);
this.creator = creator;
}
public void onClick() {
setResponsePage(creator.newInstance());
}
}
// your class
public class MyPageCreator implements IPageCreator {
public MyPageCreator(Object provided) {
this.provided = provided;
}
public Page newInstance() {
return new MyPage(provided);
}
}
// your class
add(new PageCreatorLink("cancelLink", new MyPageCreator(provided));
maybe your page class could also be the IPageCreator, serving like a prototype:
// your class
public class MyPage extends WebPage implements IPageCreator {
....
}
The factory would be nice when you have to execute some service method
before rendering the page, so you would have more clearly separated
responsabilities, i.e., the factory would be responsible for calling
the service and the page would act just for the view. That way your
classes would be more testable too.
2005/11/18, Igor Vaynberg <[EMAIL PROTECTED]>:
> imho that is the best practice. that is what i use whenever i do not need a
> bookmarkable page. i have yet to use the PageLink class. PageLink makes it
> easier to create links to pages because it lets you specify the class name
> of the page or the created page instance. This is ok for pages that are not
> bookmarkable and take no parameters, but most of the time that is not the
> case in my experience.
>
> if you work with bookmarkable pages a lot, a static factory method that
> fills in pageparameters can help with type safety and forgotten params.
>
> -Igor
>
>
>
> On 11/18/05, Gustavo Hexsel <[EMAIL PROTECTED]> wrote:
> > Hi all,
> >
> > I wanted to know what's the best way to use Links (PageLinks,
> BookmarkablePageLinks).
> >
> > In the beginning, I was using BookmarkablePageLink's and converting
> everything to and from Strings. That obviously was flawed, as I was using
> string names and passing them back and forth (lost strong-typing,
> occasionally forgot one parameter, or mistyped the name of it). It also
> made me reload objects from the database even though I had them handy on the
> calling class.
> >
> > Then I tried using PageLink's, passing a "new
> XXXPage(whateverparameter)" in the constructor. That didn't work either, as
> pages have links back and forth, leading to stackoverflows.
> >
> > Then I moved one step up in the object hierarchy and started using
> Link's, but it seems such red tape for each link having to write:
> > add(new Link("cancelLink") {
> > public void onClick() { setResponsePage(new
> EditProviderPage(provider)); };
> > });
> >
> > Any suggestions?
> >
> >
> > []s Gus
> >
> >
> >
> >
> >
> >
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