Which pattern should apply in this case? 2005-05-12 - By Dharmendra Sharan
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Hi Mich,
Here's a good tutorial on Decorator design pattern (googled it!), perhaps
this should help clarify the solution for you.
http://www.research.umbc.edu/~tarr/dp/lectures/Decorator-2 (See http://tor-2.ora-code.com)pp.pdf
Please let me know if you need further info. or help with regards to the
same. Thanks!,
Dharm
ps: have a good day!
-- --Original Message-- --
From: An interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)]On Behalf Of Mich
Hagdishovich
Sent: Friday, March 25, 2005 7:27 PM
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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