Re: [aspectj-users] Match a method call on a class field with specific a

[Adrian Colyer <adrian_colyer@xxxxxxxxxx>]

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?

-- Adrian
Adrian_Colyer@xxxxxxxxxx

Rifflard Mickaël <Mickael.Rifflard@xxxxxxxxxxxxxx>
Sent by: aspectj-users-admin@xxxxxxxxxxx

23/02/2005 08:22

Please respond to
aspectj-users@xxxxxxxxxxx

To	<aspectj-users@xxxxxxxxxxx>
cc
Subject	[aspectj-users] Match a method call on a class field with specific annotation

Hi all,

I don't succeed to express with AspectJ 5 this _expression_ :

                
Match a method call on a class field with specific annotation
                
(Of course, I don't know the name of the class and field)

Exemple : 

                
public class MyClass {

                
                 @MyAnnotation
                
                 public
static SortedMap myMap1 = new TreeMap();

                
                 public
static SortedMap myMap2 = new TreeMap();

                
                 public
static void main(String[] args) {
                
                 
               
myMap1.put("key","value"); // Match this method call
                
                 
               
myMap2.put("key","value"); // Don't match this method
call
                
                 }
                
}

Any suggestion would be appreciated,

Regards

                
Mickaël Rifflard


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