Hi Howard,
This is a very nice feature, in my app, I have many small tables, say 30, so
to edit those 30 objects I have to create 30 page classes without template,
that's a big saving. I'd like to save further, is there a way that we can
create a generic page class that can be called from other pages? if this is
possible then we save another 30 page classes. if this is not possbile I am
thinking of 'embedding' the edit class in a main page class, say:
// main page class for applicants
public class AdminApplicant {
// nested page class for the AdminApplicant.tml to call edit objects
public class Edit extends EditPage<Applicant> {
};
}
but the "embedded" Edit class is not visible in the AdminApplicant.tml, is
there a way to make this works?
Thanks,,
A.C.
Howard Lewis Ship wrote:
>
> To be more specified,
>
> you can define a base class:
>
> package com.myapp.base;
>
> public class EditPage<T> {
>
> @Persist private T _object;
>
> public T getObject() { return _object; }
>
> public void setObject(T object) { _object = object; }
>
> . . .
> }
>
> So you can create a page that can edit an arbitrary object. EditPage
> will have its own Tapestry template containing, say, a BeanEditForm.
>
> Now, you can define a new class:
>
> package com.myapp.pages;
>
> public class EditAccount extends EditPage<Account>
> {
> }
>
> EditAccount will inherit logic and template from EditPage.
>
> Further, the getObject() and setObject() properties will be bound to
> the type Account. This takes some doing, as the type of property
> object of class EditPage is nominally java.lang.Object (due to type
> erasure). However, Tapestry does a bit of work with reflection to
> deduce the effective type of the property (Account).
>
> This is a very, very high level of reuse ... and once again, we are
> leveraging Java's type system to help us, rather than traditional Java
> coding where we spend our time "appeasing" the type system.
>
>
>
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