Which pattern should apply in this case? 2005-03-26 - By Mich Hagdishovich
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Thanks Tareq for your prompt reply.
I did check out Decorator pattern. Unfortunately, that makes me create a
decorator after each object creation.
Perhaps there is no direct pattern to the real world problem that I presented.
thanks anyway,
best regards
Mich Hagdishovich
Genetics Software http://www.kromosoft.com
On Fri, 25 Mar 2005 20:24 , Tareq Ayub <tayub@(protected)> sent:
>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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