It sounds like what you want is to have
Dog extend AbstractCreature, Mammal, and Shark extend
AbstractCreature,Fish
In the world of ITDs I think what you're looking to do is to
have the abstractness of AbtractCreature fulfilled by either
Mammal or Fish.
YOu should be able to do:
class Dog extends AbstractCreature implements Mammal {
}
And then declare the implementations for the abstract methods
in AbstractCreature as ITDs in both Mammal and Fish:
something like:
public aspect MammalImpl {
public void Mammal.methodThatsAbstractInAbstractCreature()
{
//method impl;
}
}
On 14/10/2010 17:08, Richard Gundersen wrote:
Hi
I'm struggling with a problem that I *think* AspectJ might be able
to help me with, but I'm not sure so I was hoping someone could
give me some advice.
I want to be able to change the class that a certain class'
superclass extends, if that makes sense? So (in terms that I
understand) I might have Dog, which extends AbstractCreature,
which in turn extends Mammal.
However alongside Dog, I now want to add 'Shark' which I still
want to extend AbstractCreature (because it has some useful
functionality). But, this time, I want to change the class that
AbstractCreature extends to 'Fish', rather than Mammal. Like this:
Dog <-- AbstractCreature <-- Mammal
Shark <-- AbstractCreature <-- Fish
So basically if AbstractCreature is being subclasses by a dog, it
should extend Mannal, or if by Shark, it should extend Fish.
I'm hoping there's a magical inter-type declaration annotation (or
even better a Spring/AspectJ annotation, something like
@DeclareParents perhaps) that I can add to both Dog and Shark.
I would really appreciate any help anyone can give me on this. My
real world example is some really complex code that I don't want
to duplicate/mess with too much, so AOP would seem to be a perfect
solution.
If its of any use, in my real world example, Shark extends Fish
directly, but I need to modify it so Shark now extends
AbstractCreature, and then (ultimately) Fish, not Mammal.
Thanks
Richard
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