Which pattern should apply in this case? 2005-03-28 - By Tubman Aharon
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I am not clearly understand your case but may be follows can help you:
You can use delegate pattern like this:
public interface X{}
public interface Y{}
public interface Z extends X,Y{}
public class Ximpl implements X {}
public class Yimpl implements Y {}
public class Zimpl implements Z {
// delegate all relevant services to XImpl or YImpl
private X x = new XImpl();
private Y y = new YImpl();
}
-- --Original Message-- --
From: An interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)] On Behalf Of Mich
Hagdishovich
Sent: Saturday, March 26, 2005 2:27 AM
To: J2EEPATTERNS-INTEREST@(protected)
Subject: Which pattern should apply in this case?
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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