Re: [aspectj-users] @DeclareParents and this.getClass()

[Roland Reckel <rreckel@xxxxxx>]

Thank you for you reply!

I read the doc now and it clearly says that "this" is the interface
type. Sorry for that, I didn't read it before :-(

But I have an other question now:
If "this" is the interface type, and casting "this" to target is bad
programming technique (and I agree!!!), how can I get the annotations of
the target (as this.getClass().getAnnotations() will not work.....)

Is there any solution to this?

Thanks for your help.
Roland 


On Mon, 2007-04-02 at 14:45 +0100, Matthew Webster wrote:
> 
> Roland, 
> 
> With "declare parents implements" in an ITD method "this" will refer
> to the interface type. That behaviour _is_ the same between the two
> programming styles. However, that is the only guarantee we can make
> (please read
> http://www.eclipse.org/aspectj/doc/released/adk15notebook/ataspectj-itds.html). With code style "this" can also refer to the "declare parents implements" target but only by casting to the correct type. In general though this is probably not good programming technique. 
> 
> Matthew Webster
> AOSD Project
> Java Technology Centre, MP146
> IBM United Kingdom Limited
> Hursley Park, Winchester,  SO21 2JN, England
> Telephone: +44 196 2816139 (external) 246139 (internal) 
> 
> 
> Roland Reckel <rreckel@xxxxxx> 
> Sent by:
> aspectj-users-bounces@xxxxxxxxxxx 
> 
> 30/03/2007 07:37 
>          Please respond to
>      aspectj-users@xxxxxxxxxxx
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> 
> 
> 
>                To
> aspectj-users@xxxxxxxxxxx 
>                cc
> 
>           Subject
> Re:
> [aspectj-users]
> @DeclareParents
> and
> this.getClass()
> 
> 
> 
> 
> 
> 
> 
> 
> I tried to do exactly the same aspect using "code style" and it worked
> perfectly. But in the doc I found this:
> "Whichever style you use, the AspectJ weaver ensures that your program
> has exactly the same semantics."
> 
> I think this is not true! "this" returns different instances in the
> different styles.
> 
> Is this a bug in the annotation style or is this intended?!?!?
> 
> I really like the annotation style with the LTW (very flexible and
> dynamic, can even compile in Continuum without ajc etc......), but for
> now it is unusable to me :-((
> 
> Please help!
> 
> Thanks
> 
> On Wed, 2007-03-28 at 14:50 +0200, Roland Reckel wrote:
> > Hi
> > 
> > I have a problem with the @DeclareParents annotation:
> > this.getClass() returns the implementation class of the Aspect and
> not
> > the "aspected" class.
> > 
> > Is this a bug? Or does any other method exist to get the aspected
> class?
> > BTW: I use AspectJ 1.5.3
> > 
> > Here an example:
> > 
> > @Aspect
> > public class PersistenceAspect {
> > 
> >     public interface IPersistentObject {
> >         void store();
> > 
> >         void delete();
> >     }
> > 
> >     public static class PersistentObjectImpl implements
> > IPersistentObject {
> > 
> >         public void store() {
> >         }
> > 
> >         public void delete() {
> >                                   System.out.println("Class: " +
> this.getClass())  // Does return
> > PersistentAspect$PersistentObjectImpl  !?!?!?!?
> >         }
> >     }
> > 
> >     @DeclareParents(value =
> "@lu.vdl.trasal.annotation.PersistentObject
> > *", defaultImpl = PersistentObjectImpl.class)
> >     private IPersistentObject implementedInterface;
> > 
> > }
> > 
> > 
> > Does anybody have the same problem? (I found some mails with the
> same
> > problem but no answer or bug report :-((
> > 
> > Thx for your help
> > 
> > 
> > _______________________________________________
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> > aspectj-users@xxxxxxxxxxx
> > https://dev.eclipse.org/mailman/listinfo/aspectj-users
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