Re: (no subject)

by Simone Gianni-2 :: Rate this Message:

Hi Ravi,
you can declare a pointcut around the creation of any ArrayList,
returning MyArrayList as long as they are assign-compatible.

That means that as long as :

public class MyArrayList extends ArrayList { ...

you can write :

ArrayList around() : call(* ArrayList.new()) {
return new MyArrayList();
}

This will replace do the trick. You can narrow it down to some classes
using within, withincode etc..

ArrayList around() : call(* ArrayList.new()) && within(com.mycompany.*) {
return new MyArrayList();
}

And you can add other advice to add parameters :

ArrayList around(int size) : call(* ArrayList.new(int)) && args(size) {
return new MyArrayList(size);
}

etc...

In my Apache Magma Lab I use this kind of advice extensively to offer a
simpler alternative to the factory pattern/dependency injection/context
pollution.

Hope this helps,
Simone

Ravi Chandra wrote:

> hi,
>
> I am trying hard to get a solution to this problem since last 4 days..
> but no luck; the issue is as below:
>
> I have java classes of this form
>
> public class UserAttributes implements Interceptable {
> private List<String> alias;
>
> private void someMethod(){
> *alias = new ArrayList(); // point 1*
> .... etc etc
> }
> }
>
> Now the problem is :
>
> When ever a variable is assigned to new ArrayList() i want it to be
> changed to new MyArrayList() instead
>
> i.e..: the point 1 above changes to an eqvivalent of
>
> *alias = new MYArrayList();*
>
> I am able to get this done
>
> aspect abc {
> pointcut listCut(Interceptable m, IN in):target(m) &&
> set(java.util.List+ *);
> after(Interceptable m, IN in):listCut(m,in){
> *UserAttributes.setAlias( new MyArrayList());*
> }
> }
>
> *but the point cut is getting very class specific. *I have abt 1000
> classes which have to be modified this way where ever the ArrayList is
> being used, now with this approach i need to write 1000 files; isnt
> there a generic way to do this?
>
> Any pointers/ help ? please suggest.
>
> regards,
> ravi
>
> ------------------------------------------------------------------------
>
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> aspectj-users@...
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>

--
Simone Gianni CEO Semeru s.r.l. Apache Committer
http://www.simonegianni.it/

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