Hi Joe,
you are right, but I think the spec is clear enough here. The delegate has to
have the same type parameters as the decorator and the decorated bean has to
match the delegate in clearly specified way.
So the following all should work:
@Decorator
public class TestDecorator implements GenericInterface {
@Inject @Any @Delegate
private GenericInterface delegate;
}
@Decorator
public class TestDecorator implements GenericInterface<?> {
@Inject @Any @Delegate
private GenericInterface<?> delegate;
}
@Decorator
public class TestDecorator<T> implements GenericInterface<T> {
@Inject @Any @Delegate
private GenericInterface<T> delegate;
}
@Decorator
public class TestDecorator implements GenericInterface<ConcreteClass> {
@Inject @Any @Delegate
private GenericInterface<ConcreteClass> delegate;
}
I am afraid, that all does not work with OWB. I have tracked it down to the
ClassUtil.setInterfaceTypeHierarchy. It does not respect actual type-arguments.
I create a Jira-Issue and try to provide a fix for this.
Regards,
Arne
Von: Joseph Bergmark [mailto:[email protected]]
Gesendet: Mittwoch, 20. April 2011 17:10
An: [email protected]
Betreff: Re: Decorators with generic type-arguments
I took a quick look at the spec, I didn't find much at all about Decorators
with generic types. The only snippet I found was in 8.1.3, where it basically
says that if the Decorated type is a parameterized type, then the delegate type
has to have the same type parameters as the decorated type, otherwise it is a
definition error.
It seems to me there is probably an OWB bug here, but the spec doesn't provide
a lot of guidance beyond the single definition error.
Sincerely,
Joe
On Wed, Apr 20, 2011 at 9:40 AM, Arne Limburg
<[email protected]<mailto:[email protected]>> wrote:
Hi,
Currently I try to get a Decorator working, that decorates an interface with a
generic type argument. Although the Spec is quite clear about how to handle
this (in 8.3.1) I am afraid, OpenWebBeans cannot handle it:
This is the scenario
@Decorator
public class TestDecorator<A extends Annotation> implements GenericInterface<A>
{
@Inject @Any @Delegate
private GenericInterface<A> delegate;
}
public class TestBean implements GenericInterface<Scope> {
...
}
I have tried various combinations of actual type arguments in the Decorator
(like Wildcard, raw type, ...). The above leads to a definition error. Some
other combinations lead to a behavior where the Decorator is not applied. Even
declaring the Decorator with the same actual type variable (Scope in the
example) does not work?
Would you consider this a bug or do I read the spec wrong and this is not
supported.
Shall I fill a Jira Issue?
Regards,
Arne
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