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Dear Elizabeth,
Thank you for your information ^^ I have had such a
long time to find the answer :)
----- Original Message -----
Sent: Tuesday, December 13, 2005 3:18
AM
Subject: RE: [aspectj-users] the use of
inter-type declaration for extending a class
Thanks Ron, I can ask for no higher praise! (although maybe a free copy
of Ramnivas' next book for all the marketing I have been
doing)
Elizabeth
Elizabeth,
You should ask Tra
to share 50% of the credit he gets on this assignment... at least it sure
sounds like he's a student trying to use the mailing list to do his
homework. You get an A for the answer though
;-)
From:
aspectj-users-bounces@xxxxxxxxxxx [mailto:aspectj-users-bounces@xxxxxxxxxxx]
On Behalf Of Echlin Harmer,
Elizabeth
Sent: Monday,
December 12, 2005 9:37 AM
To: 'Tra My'; 'aspectj-users@xxxxxxxxxxx'
Subject: RE: [aspectj-users] the use of
inter-type declaration for extending a
class
(I am quoting
Ramnivas Laddad, if you don't have a copy of AspectJ in Action, run out and
get one!)
"A crosscutting
concern often needs to affect a set of classes or interfaces that share a
common base type". (Graphics objects like pointers and menus in Swing come
to mind). We can't go and change the class definition for Menu to inherit
from mySpecialComponent instead of inheriting from Component. Even if you
are working with a set of classes that you control, the whole point of the
aspect is to separate concerns, not to hard-code them into your classes. So
you create mySpecialComponent extends Component, and then define an aspect
to insert the cross-cutting concern into the appropriate children of
Component. "The result of such an arrangement is the decoupling of the
aspect from the application-specific class, thus making the aspect more
re-usable."
-----Original
Message-----
From:
aspectj-users-bounces@xxxxxxxxxxx
[mailto:aspectj-users-bounces@xxxxxxxxxxx]On Behalf Of Tra My
Sent: December 7, 2005 10:55
AM
To: aspectj-users@xxxxxxxxxxx
Subject: [aspectj-users] the use of
inter-type declaration for extending a class
As I know, in AspectJ there's
a declaration like below, with A and B are
classes
declare
parents: A extends B;
My question is: is there
any real use of this kind of declaration? I think to change A's parent, we
have an easier choice: change directly in class A's definition. Is there
any reason why we should use this AspectJ declaration ? I hope the AspectJ
authors have a reason to think of this
declaration.
A small example would be very
good.
I desperately need the answer
for this question, any help would be greatly
appreciated.
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