Re: [aspectj-users] Inter-Type Declaration Help Needed

[Kevin Shale <Shale@xxxxxx>]

Two very workable solutions ... thanks Andrew !!!!



------------------------------------------------------------

Or, of course:

interface A {public void ma();}
interface B {public void mb();}

class C implements B {
  public void mb() {}
}

aspect X {
  public void A.ma() {}

  declare parents: B+ && !B implements A;
}


On 12/12/2007, Andy Clement <andrew.clement@xxxxxxxxx> wrote:
> A variant that I just wrote (does use the hasmethod feature...)
>
> --- A.java ----- 8< -----
> interface A {public void ma();}
>
> interface B {public void mb();}
>
> // Implementor of B
> class C implements B {
>   public void mb() {}
> }
>
> aspect X {
>   // Give implementors of A a default implementation of the method
>   public void A.ma() {}
>
>   // For any type that is not B and has a method defined that was
> declared in B, make it implement A
>   declare parents: !B && hasmethod(* B.*(..)) implements A;
> }
> -----8<------
>
> $ ajc -1.5 -XhasMember -showWeaveInfo A.java
> Extending interface set for type 'C' (A.java) to include 'A' (A.java)
>
> Type 'C' (A.java) has intertyped method from 'X' (A.java:'void A.ma()')
>
> Type 'A' (A.java) has intertyped method from 'X' (A.java:'void A.ma()')
>
>
> On 12/12/2007, Bhaskar Maddala <maddalab@xxxxxxxxx> wrote:
> > My attempt at trying to implement what I understand from your
> > question, note though I am a newbie
> >
> > public interface Foo {
> >     public void doFoo();
> > }
> >
> > public interface Bar {
> >     public void doBar();
> > }
> >
> > public class FooImpl implements Foo {
> >     public void doFoo() {
> >         System.out.println("you got fooed");
> >     }
> > }
> >
> > public class BarImpl implements Bar {
> >     public void doBar() {
> >         System.out.println("you got barred");
> >     }
> > }
> >
> > import foo.Foo;
> > import bar.Bar;
> > import bar.BarImpl;
> >
> > public aspect FooBar {
> >     declare parents : Foo extends Bar;
> >
> >     public void Foo.doBar() {
> >        Bar bar = new BarImpl();
> >        bar.doBar();
> >     }
> > }
> >
> > import bar.Bar;
> > import foo.Foo;
> > import foo.FooImpl;
> >
> > public class Main {
> >     public static void main(String[] args) {
> >         Foo foo = new FooImpl();
> >         foo.doFoo();
> >         ((Bar)foo).doBar();
> >     }
> > }
> >
> > Result of running Main
> >
> > you got fooed
> > you got barred
> >
> > Hope that helps
> >
> > Bhaskar
> >
> >
> >
> >
> > On Dec 12, 2007 11:40 AM, Kevin Shale <Shale@xxxxxx> wrote:
> > > Hi, I am a relative newbie to AspectJ and I have a problem to solve.
> > >
> > > In Java I have two interfaces A and B which are not related to each other via extends.
> > >
> > > Each interface has a number of concrete implementation classes.
> > >
> > > I am looking for a way to use AspectJ to force every class which implements interface B to also implement interface A with methods defined in the aspect.
> > >
> > > How would I go about programming this?
> > >
> > > Best Regards
> > > Kevin
> > > _______________________________________________________________________
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> > >
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> >
>
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