Consider the following:
I create the following interface:
interface FooComponent {
}
that I make my own extension of a third party library's class
implement:
class FooComponentImpl extends ThirdPartyFooComponent
implements FooComponent {
}
I add "shadow" methods to FooComponent to allow me to access
FooComponentImpl (and, more importantly, ThirdPartyFooComponent)
methods via the FooComponent interface.
I want to keep ModelImpl agnostic to this third party library, so I
write it in terms of FooComponent interface instead of
FooComponentImpl:
class ModelImpl implements Model {
@Inject private FooComponent _comp;
}
This allows me to inject a fake FooComponent for a unit test:
class FakeFooComponent implements FooComponent {
}
ViewImpl however needs to be written in terms of the Third Party
library's classes in order to use that library's API:
class ViewImpl extends ThirdPartyContainer
implements View {
@Inject private FooComponentImpl _comp;
void init() {
// add() is a ThirdPartyFooComponent API method written
// in terms of ThirdPartyFooComponent
add(_comp);
}
}
I never plan on injecting anything other than a FooComponentImpl into
ViewImpl.
How do I inject the same instance into both ModelImpl and ViewImpl,
given that they are different types? I can annotate each with
@Named("component1") and add that to the binding:
bind(FooComponent.class)
.annotatedWith(Names.named("component1")
.to(FooComponentImpl.class)
.in(Scopes.SINGLETON);
but Guice can't resolve the inject request in ViewImpl because it's
written in terms of FooComponentImpl, not FooComponent.
Is what I'm asking for even possible to do in Guice? I really don't
want to have to write ViewImpl like this:
class ViewImpl extends ThirdPartyContainer
implements View {
@Inject private FooComponent _comp;
void init() {
// add() is a ThirdPartyFooComponent API method written
// in terms of ThirdPartyFooComponent
add(ThirdPartyFooComponent.class.cast(_comp));
}
}
Thanks in advance for your time.
-Russ
--
You received this message because you are subscribed to the Google Groups
"google-guice" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-guice?hl=en.
