[
Date Prev][
Date Next][
Thread Prev][
Thread Next][
Date Index][
Thread Index]
[
List Home]
|
Re: [aspectj-users] Selecting arithmetic operation join points. Is it possible?
|
> > For example I'd like to be able to select integer subtraction:
> >
> > Integer i = 5;
> > Integer j = 2;
> > Integer r = i - j;
> >
> > Maybe if Java supported operator overloading that would be fairly easy.
> >
> > 1. So is something like this possible now? I'm pretty sure it is not.
>
> You are right, it is not possible.
>
> > 2. Would this be possible to implement? How? Effort?
> > 3. Is something like this planned for future AspectJ versions?
>
> I cannot speak for the developers, but I do not think you will ever see this feature in AspectJ.
>
> >
>
> Regards
I'm not sure I see why not. Please consider the following example:
public aspect StringConcat {
public pointcut concat() : call(* java.lang.StringBuffer.append(..));
before() : concat() {
System.out.println("About to concatenate!");
}
}
public class Tester {
public static void main(String[] args) {
String a = "a";
String b = "b";
System.out.println(a + b);
}
}
When main() is executed the result is:
=======================
About to concatenate!
ab
=======================
So we actually have a real example where the + operator is overloaded and the resulting code is directly in the client byte code.
Now I'm not too familiar with the Java byte code spec but I don't see why the same cannot be done for e.g. Integer or event the primitive types?
Thank you.
MP
