Design pattern question

Markus von Ehr markus.vonehr at ipm.fhg.de
Wed Aug 21 09:48:27 CEST 2002


Hi Karl,

I don't understand what you wanna do exactly, but do you know the
BioPython project? Maybe there's already something inside matching
your problem.

http://biopython.org

Markus


Karl Schmid schrieb:
> 
> Hi,
> 
> I would like to separate an abstraction from its implementation. I think
> this is called the Bridge pattern by Gamma et al. (or at least it is a part
> of a bridge pattern).
> 
> In particular, I would like to assemble a set of DNA sequences and have the
> option to chose among different assembly algorithms. I am not sure what the
> best way to do this would be:
> 
> class SequenceAssembler:
> 
>     def __init__(self,assembler_type):
> 
>         if assembler_type == 'cap3':
>             # What should I do here?
>         elif assembler_type == 'phrap':
>             # What should I do here?
> 
>     def save_sequences():
>         pass
> 
> class Cap3Assembler(SequenceAssembler):
> 
>     def run_assembler():
>         # Cap3 specific instructions
>         pass
> 
> class PhrapAssembler(SequenceAssembler):
> 
>     def run_assembler():
>         # Phrap specific instructions
>         pass
> 
> Now I would like to instantiate the abstract class, but to obtain an
> instance of either the Cap3Assembler or PhrapAssembler class depending on
> the assembler_type variable.
> 
> >>> assembler = SequenceAssembler(assembler_type)
> 
> Is this possible?
> 
> Thank you in advance.
> 
> -- Karl Schmid



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