Hi Andy
Thank you for your reply. I have simplified and reprashed the
question, hoping for an answer. If not i'll register a bug.
Thanks / Andreas
On 11/08/2009, at 23.17, Andy Clement <[email protected]> wrote:
Hi,
seems like a generics aspects bug, although maybe a limitation.
That is a pretty sophisticated aspect and I'd need to spend some
time with pen and paper working out if what you are trying to do is
(a) possible (b) supported. I would raise an AspectJ bug for
clarification of this.
Andy
2009/8/9 Andreas Møller Holst <[email protected]>
Hi
Im new to AOP and AspectJ. Currently Im studying an aspect oriented
library to support associations as cross cutting concerns.
In this library I have an aspect /SimpleStaticRel/ that alters the
type hirarchy and introduce new members to the formal type
parameters /FROM/ and /TO/.
Below I present a snippet of the original implementation which is
relevant to my question.
#1:
If I declare /final private HashSet<TO> Fwd.fwd = new HashSet<TO>
();/ I get the follwoing compile error: The method add(TO) in the
type HashSet<TO> is not applicable for the arguments (TO)
forward.fwd.add(_t);
#2:
Here I have made a test which shows me that its possible to
parameterize a HashSet with generic type /FROM/. This HashSet is a
member of the aspect and is not introduced as a member of FROM.
Why is it ok to parameterize in this situation?
----------------------------- -----------------------------
----------------------------- -----------------------------
-----------------------------
import java.util.*;
public abstract aspect SimpleStaticRel <FROM,TO>{
public static interface Fwd {}
//public static interface Bwd {}
declare parents : FROM implements Fwd;
// #1
final private HashSet<TO> Fwd.fwd = new HashSet<TO>();
//final private HashSet Fwd.fwd = new HashSet();
// #2
private HashSet<TO> myHash = new HashSet<TO>();
public boolean add(FROM _f, TO _t) {
myHash.add(_t);
return true;
}
public boolean andreasAdd(FROM _f, TO _t) {
Fwd forward = (Fwd) _f;
forward.fwd.add(_t);
return true;
}
}
Thank you / dres
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