Am not sure it totally solves your issue but you've seen how to get a
TypeLiteral from a Class right?
http://google-guice.googlecode.com/svn/trunk/javadoc/com/google/inject/TypeLiteral.html#get(java.lang.Class)
2008/10/3 Rahul <[EMAIL PROTECTED]>:
>
>
> Context: I have a Store interface for saving various Entities -
> Project, ProjectGroup, ProjectNotifier - all extending from
> CommonUpdatableEntity:
>
> public interface Store<T extends CommonUpdatableEntity, Q extends
> Query<T>> {
> public T save(T entity) throws StoreException;
> // ...omitted for brevity.
> }
>
>
> and its implementation:
>
> public class JpaStore<T extends CommonUpdatableEntity, Q extends
> Query<T>> implements Store<T, Q> {
> @Transactional
> public T save(T entity) throws StoreException {
> // ...omitted for brevity.
> return savedEntity;
> }
> }
>
>
> configured via a module:
>
> public class StoreModule extends AbstractModule {
> protected void configure() {
> bind(new TypeLiteral<Store<Project, Query<Project>>>() {
> }).to(new TypeLiteral<JpaStore<Project, Query<Project>>>() {
> });
> bind(new TypeLiteral<Store<ProjectGroup, Query<ProjectGroup>>>() {
> }).to(
> new TypeLiteral<JpaStore<ProjectGroup, Query<ProjectGroup>>>()
> {
> });
> bind(new TypeLiteral<Store<ProjectNotifier,
> Query<ProjectNotifier>>>() {
> }).to(
> new TypeLiteral<JpaStore<ProjectNotifier,
> Query<ProjectNotifier>>>() {
> });
> }
> }
>
> In my web actions (Controllers of MVC), I would like to retrieve the
> appropriate Store instance based on the Entity the action is creating/
> updating.
>
> To mimic this, I quickly created the following unit test which
> attempts to get a Store instance in a similar manner:
>
> public class StoreTest{
> @Inject
> Injector injector;
>
> //...omitted
>
> @Test
> public void testCreateProject() throws StoreException {
> Project project = new Project();
> project.setName("sample-project");
> Store<Project, Query<Project>> store =
> getStoreInstance(Project.class);
> Assert.assertTrue(null == project.getId()); // FAILS TO GET A
> STORE INSTANCE
> project = store.save(project);
> }
>
> private <T extends CommonUpdatableEntity> Store<T, Query<T>>
> getStoreInstance(Class<T> entity) {
> List<Binding<Store<T, Query<T>>>> bindings =
> injector.findBindingsByType(new TypeLiteral<Store<T, Query<T>>>() {
> });
> if (bindings.size() > 0) {
> return bindings.get(0).getProvider().get();
> }
> return null;
> }
>
> }
>
> So, basically I want:
> - a JpaStore<Project, Query<Project>> instance for Project.class
> - a JpaStore<ProjectGroup, Query<ProjectGroup>> instance for
> ProjectGroup.class
> - so on ...
>
> My question - How can I do such an instance retrieval using Guice API
> at runtime?
>
> Thanks,
>
> Rahul
>
> >
>
--
James
-------
http://macstrac.blogspot.com/
Open Source Integration
http://open.iona.com
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