Re: [aspectj-users] Newbie question

[Andrew Clement <CLEMAS@xxxxxxxxxx>]

Hi William,

Until recently we had a limitation
on binding things multiple times - and we'd 
produce an error - *this was regardless
of whether you (as the developer) know 
they are binding to the same thing*.

Actually when I ran your testcode on
AspectJ 1.5.0M1 it is the first set that 
fails for me and the second set that
work.  This is what I expected, because if 
you 'expand' the methods() pointcut
in the first case it looks like:

pointcut methods(TestClass tc): ((target(tc)
&& call(public * set*(..)) && args(int)) || 
         
                     
 (target(tc) && call(public * get*(..)));

and according to the rules about binding,
we see 'tc' twice on the right and
fail.

But, that has been fixed since 1.5.0M1
and if you download
the current build, it will succeed
with either variant of your pointcuts:

http://download.eclipse.org/technology/ajdt/dev/aspectj-DEVELOPMENT.jar

There is currently no AJDT that contains
this level of AspectJ but there will
be shortly...

cheers,
Andy.
---
Andy Clement
AspectJ
clemas@xxxxxxxxxx

W.Leeson@xxxxxxx
Sent by: aspectj-users-admin@xxxxxxxxxxx

17/01/2005 10:20

Please respond to
aspectj-users@xxxxxxxxxxx

To	aspectj-users@xxxxxxxxxxx
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Subject	[aspectj-users] Newbie question

Hi All, 
        Just started using AspectJ on Friday last week
and have being doing a bit of experimentation but have a quick question
about the following pointcut definitions 
  
// 1st 
 pointcut setMethods(TestClass tc): target(tc) && call(public *
set*(..)) && args(int); 
 pointcut getMethods(TestClass tc): target(tc) && call(public *
get*(..)); 
 pointcut methods(TestClass tc): (setMethods(tc) || getMethods(tc));
        
// 2nd 
 pointcut setMethods(): call(public * set*(..)) && args(int);
 pointcut getMethods(): call(public * get*(..)); 
 pointcut methods(TestClass tc): target(tc) && (setMethods() ||
getMethods()); 

Now what I don't understand is why does the first version of methods work
and the second one produce the following error 

Cannot use target() to match at this location and bind to formal type 'TestClass'
- the formal is already bound to 'TestClass'. The secondary source location
points to the problematic target(). 
        -TestAspect.before(TestClass):methods..
        -TestAspect.after(TestClass):methods..

at the following code fragment 

        tc.setValue(0); 

From my understanding I think they should evaluate to the same thing. I
am sure I am missing something some thing fundamental here.

Regards, 
William Leeson
Software Development

PILZ Ireland Industrial Automation,
Business & Technology Park, Model Farm Road, Cork, Ireland.
Telephone +353 (021)  4804-982, Fax +353 (021) 4804-994
E-Mail: mailto:w.leeson@xxxxxxx, Internet: http://www.pilz.ie

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