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Python-設計模式-備忘錄模式

Python
設計模式
備忘錄模式



class Memento: 
   def __init__(self, state): 
      self.state = state 
   def GetState(self): 
      return self.state 

 class Origniator: 
   def __init__(self): 
      self.state = '' 
   def GetState(self): 
      return self.state 
   def SetState(self, state): 
      self.state = state 
   def SaveStateToMemeto(self): 
      return Memento(self.state) 
   def getStateFromMemeto(self, Memento): 
      self.state = Memento.GetState() 

 class CareTaker: 
   def __init__(self): 
      self. MementoList = [] 
   def Add(self, memento): 
      self.MementoList.append(memento) 
   def GetMementoIndex(self, index): 
      return self.MementoList[index] 

 O = Origniator() 
C = CareTaker() 
O.SetState('1 state 1') 
O.SetState('2 state 2') 
C.Add(O.SaveStateToMemeto()) 
O.SetState('3 state 3') 
C.Add(O.SaveStateToMemeto()) 
O.SetState('4 state 4') 
print('Current State : ' + O.GetState()) 
O.getStateFromMemeto(C.GetMementoIndex(0)) 
print('First State : ' + O.GetState()) 
O.getStateFromMemeto(C.GetMementoIndex(1)) 
print('Second State : ' + O.GetState())


程式碼說明


定義memeto，定義操作類別，定義儲存類別，操作。
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