Which pattern should apply in this case? 2005-03-25 - By Tareq Ayub
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Take a look at the Decorator pattern (Gang of four). A great way to extend
behavior without changing the original model.
On 3/25/05 6:26 PM, "Mich Hagdishovich" <mich.hagdishovich@(protected)>
wrote:
> First of all, I apologize for such a descriptive subject, I did not find an
> adequate way of summarizing the exact question:
>
> I have a set of base classes that work well within a product, but I need to
> extend them for another product (and keep the existing product).
>
> The exact class diagram is as follows:
>
> I have a base class "A_0" that is extended by 40 or so other classes (A_1 ..
> A_40). This infrastructure constitutes module "M1" of my product "P1".
>
> Now, I need to have a module "M2", of product "P2". Module "M2" is exactly
> like module "M1", but with an added feature (method).
>
> For now, what I have done is, I have added the feature (method) to "A_0", and
> this method is not used by anything within P1, but this way M2 is the same as
> M1, and I can reuse the same jar.
>
> I was thinking if there is a cleaner solution to this. Please note that I
> cannot simply extend the classes, as the concrete classes A_1 .. A_40 are
> already there, and if I extend them, I would be created B_1 extends A_1 ;..
> B_40 extends A_40, with an exact same method added, and that seems to be an
> even (much) worse solution.
>
> thanks,
>
> Mich Hagdishovich
> Genetics Software www.kromosoft.com
>
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