Design pattern question

Uwe Schmitt uwe.schmitt at procoders.net
Wed Aug 21 11:51:06 CEST 2002


Karl Schmid <schmid at ice.mpg.de> wrote:

> 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? 

you cold use someething like a plugin, but then the interface and
implementation is not really seperated:


    class GeneralAssembler:

	  def __init__(self, algorithmclass):
	      self.algorithmclass = algorithmclass
	  def run(self, data):
	      # do something with self.algorithmclass and data
	      # maybe self.algorithmclass.calculate(data) ...


    class Algorithm1:

	  def calculate(data):
	      ...


    class Algorithm2:

	  def calculate(data):
	      ...
     

now you can use 

    myassembler=GeneralAssembler(Algorithm1())
    myassembler.run(data)

o.k. ?

Greetings, Uwe


-- 
Dr. rer. nat. Uwe Schmitt      Computer science is no more about Computers,
uwe.schmitt at procoders.net      than astronomy is about telescopes. (Dijkstra)
http://www.procoders.net           



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