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RE: [aspectj-dev] Why no if-poincut for non-static expressions.
|
What happens when the aspect is 'perthis(pushPop())'; should it
be created before the pointcut is evaluated? Aspects are
guaranteed to be instantiated before advice runs, but I don't
think we want to guarantee that they will be instantiated
before pointcuts are evaluated. So I can imagine a
NullPointerException resulting from this code:
before() : if(PushUntilPop.aspectOf().state==2) {
...
}
Which is to say, you can just be a bit careful:
aspect A {
static boolean expectedState(int expected) {
A a = A.aspectOf();
return ((null != a) && (a.state == expected));
}
before() : if(expectedState(2)) {
}
}
Wes
> ------------Original Message------------
> From: Eric Bodden <eric@xxxxxxxxx>
> To: aspectj-dev@xxxxxxxxxxx
> Date: Tue, Aug-10-2004 9:39 AM
> Subject: RE: [aspectj-dev] Why no if-poincut for non-static expressions.
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Adrian Colyer wrote:
> > I recall Matthew Webster posting an answer to this one a while
> > back....
> > http://dev.eclipse.org/mhonarc/lists/aspectj-users/msg02107.html.
>
> Thanks for the quick help. Anyway - would it be possible to consider
> a feature request for this issue for later versions?
> I mean technically any "dynamic" if-pointcut could be "inlined" into
> the connected advices:
>
> int a;
>
> after(): if(a==0) && someWhateEverPointcut {
> //somecode
> }
>
> - --becomes--
>
> int a;
>
> after(): someWhateEverPointcut {
> if(a==0) {
> //somecode
> }
> }
>
> Or am I missing something?
>
> Eric
>
> - --
> Eric Bodden
> Chair I2 for Programming Languages and Program Analysis
> RWTH Aachen University
>
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>
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