There's an outstanding issue about this; may be a tough nut to crack.
On Thu, May 22, 2008 at 9:13 AM, Toby Hobson <[EMAIL PROTECTED]> wrote:
> Funny you should ask that Dan ... I was just struggling with something very
> similar:
>
> BasePage.java
>
> public abstract class BasePage<T extends Serializable> {
>
> @Inject
> private Session session;
>
> @Property
> private List<T> items
>
> private Class entityClass;
>
> public BasePage(Class entityClass) {
> this.entity = entuty
> }
>
> void onActivate() {
> items = (List<T>) session.createCriteria(entityClass).list();
> }
>
> }
>
> ListUsers.java
>
> public class ListUsers extends BasePage<User> {
> public ListUsers() {
> super(User.class);
> }
> }
>
> The theory was that I could reuse the logic in the BasePage.java (and
> BasePage.tml) but it doesn't seem to work.
>
> ----- Original Message ----
> From: Dan Adams <[EMAIL PROTECTED]>
> To: Tapestry users <users@tapestry.apache.org>
> Sent: Thursday, 22 May, 2008 4:51:33 PM
> Subject: Generics with contexts?
>
> I have a base class for add/edit pages that is genericized (sp?) to accepts
> as the entity to edit as the activitation context when editing:
>
> void onActivate(E entity) {
> adding = false;
> this.entity = entity;
> }
>
> E onPassivate() {
> if (entity == null || entity.getId() == null)
> return null;
>
> return entity;
> }
>
> The problem is that this isn't supported because tapestry doesn't know at
> runtime what the type is. How have people got around this kind of thing? One
> solution is to have onActivate() be in the subclass and call the one in the
> superclass but that seems artificial and gross. Another solution would be to
> have it accept the id of the entity rather than the entity and the load it by
> id. Any other suggestions?
>
> Dan Adams
> Senior Software Engineer
> Interactive Factory
> p: 617.235.5857
>
>
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>
>
>
>
--
Howard M. Lewis Ship
Creator Apache Tapestry and Apache HiveMind
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