Wed Dec 26 16:00:00 GMT 2001

StateDemo

#: c04:StateDemo.py # Simple demonstration of the State pattern. class State_d: def __init__(self, imp): self.__implementation = imp def changeImp(self, newImp): self.__implementation = newImp # Delegate calls to the implementation: def __getattr__(self, name): return getattr(self.__implementation, name) class Implementation1: def f(self): print "Fiddle de dum, Fiddle de dee," def g(self): print "Eric the half a bee." def h(self): print "Ho ho ho, tee hee hee," class Implementation2: def f(self): print "We're Knights of the Round Table." def g(self): print "We dance whene'er we're able." def h(self): print "We do routines and chorus scenes" def run(b): b.f() b.g() b.h() b.g() b = State_d(Implementation1()) run(b) b.changeImp(Implementation2()) run(b) #:~


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