RE: [aspectj-users] method call and annotated field

[Eric Bodden <eric@xxxxxxxxx>]

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Rifflard Mickaël wrote:
> How to express this : Match a method call when this one is perform
> on an annotated field ?

Hi, Rifflard. Correct me if I am wrong, but did we not discuss the
same question about 6 weeks ago, when you posted the very same code
snippet?

- ----------------------------------------------------------------------
- ----------
From: aspectj-users-admin@xxxxxxxxxxx
[mailto:aspectj-users-admin@xxxxxxxxxxx] On Behalf Of Adrian Colyer
Sent: Donnerstag, 24. Februar 2005 16:53
To: aspectj-users@xxxxxxxxxxx
Subject: Re: [aspectj-users] Match a method call on a class field
with specific annotation



This is an interesting use case because.... there's no easy way to do
this.

At a call join point, we know about the the *caller*, and the
*callee*, we know the static context in which the call is being made
(within, withincode), and the dynamic context in which the call is
being made (cflow[below]), so whilst we can say:

"any call where the type of the target of the call has an annotation
@ABC..."

we don't have a way to say:

"any call where the target of the call is currently refered to by a
member variable, and that member variable has an annotation of type
@ABC..."

The closest thing you can say is

"any access to a field with annotation @MyAnnotation"  :
get(@MyAnnotation * *)

Using reflection it should be possible, but awkward to get closer
what you want:

pointcut annotatedFieldCall() : call(* *(..)) &&
if(calleeIsAFieldWithMyAnnotation(thisJoinPoint);

private static boolean calleeIsAFieldWithMyAnnotation(JoinPoint tjp)
{

  / / pseudo-code...

   Object obj = tjp.getThis();
   for-all (Field field : obj.getClass().getDeclaredFields()) {
      if (field.hasAnnotation(MyAnnotation.class) return true;
   }


   return false;
}


but it's not pretty.... (and only works for fields defined within the
calling class).

If you *could* write a pointcut to match this, how would you want it
to look?


Eric

- --
Eric Bodden
Chair I2 for Programming Languages and Program Analysis
RWTH Aachen University

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