研磨设计模式解析及python代码实现——(三)适配器模式(Adapter)

一、适配器模式定义　

　　将一个类的接口转换成另外一个接口，适配器模式使得原本由于接口不兼容，而不能在一起工作的哪些类能够在一起工作。

二、python 实现

　　

 import string
 import cPickle as p
 import datetime
 import os
 class LogModel:
     logId=""
     operateUser=""
     operateTime=""
     logContent=""

     def __init__(self,id,user,time,content):
         self.logId=id
         self.operateUser=user
         self.operateTime=time
         self.logContent=content

     def setLogId(self,id):
         self.logId=id
     def setOperateUser(self,user):
         self.operateUser=user
     def setOperateTime(self,time):
         self.operateTime=time
     def setLogContent(self,content):
         self.logContent=content
     def getLogId(self):
         return self.logId
     def getOperateUser(self):
         return self.operateUser
     def getOperateTime(self):
         return self.operateTime
     def getLogContent(self):
         return self.logContent
     def toString(self):
         return "logId=%s,operateUser=%s,operateTime=%s,logContent=%s" %(self.logId,self.operateUser,self.operateTime,self.logContent)

 class LogFileOperateApi:
     def readFile(self):
         pass
     def WriteLogFile(self,list):
         pass
 class LogFileOperate(LogFileOperateApi):
     LogFilePath="AdapterLog.log"
     def __init__(self,logFilePath):
         if (logFilePath!=None)and(len(logFilePath.strip()) > 0):
             self.LogFilePath=logFilePath
     def readFile(self):
         f = file(self.LogFilePath)#open(self.LogFilePath,'r')
         if os.stat(self.LogFilePath).st_size==0:
             list=[]
         else:
             list=p.load(f)
         f.close()
         return list
     def WriteLogFile(self,list):
         f = open(self.LogFilePath, 'w')
         p.dump(list, f)
         f.close()
 class LogDbOperateApi:
     def createLog(self,logModel):
         pass
     def updateLog(self,logModel):
         pass
     def removeLog(self,logModel):
         pass
     def getAllLog(self):
         pass
 class LogDbOperate(LogDbOperateApi):
     def createLog(self,logModel):
         print "Now LogDbOperate createLog , lm=%s" %(logModel)
     def updateLog(self,logModel):
         print "Now LogDbOperate updateLog , lm=%s" %(logModel)
     def removeLog(self,logModel):
         print "Now LogDbOperate removeLog , lm=%s" %(logModel)
     def getAllLog(self):
         print "Now in LogDbOperate getAllLog"
 class TwoDirectAdapter(LogFileOperateApi,LogDbOperateApi):
     fileLog=None
     dbLog = None
     def __init__(self,fileLog,dbLog):
         self.fileLog=fileLog
         self.dbLog=dbLog
     def createLog(self,logModel):
         list=self.fileLog.readFile()
         list.append(logModel)
         self.fileLog.WriteLogFile(list)
     def updateLog(self,logModel):
         list=self.fileLog.readFile()
         for item in list:
             if item.getLogId()==logModel.getLogId():
                 item=logModel
                 break
         self.fileLog.WriteLogFile(list)
     def removeLog(self,logModel):
         list=self.fileLog.readFile()
         for item in list:
             if item.getLogId()==logModel.getLogId():
                 del item
                 break
         self.fileLog.WriteLogFile(list)
     def getAllLog(self):
         return self.fileLog.readFile()
     def readFile(self):
         return self.dbLog.getAllLog()
     def WriteLogFile(self,list):
         for item in list:
             self.dbLog.createLog(item)
 #main function
 LogFilePath="AdapterLog.log"
 f=open(LogFilePath,'w+')
 f.truncate()
 lml=LogModel("","admin",datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),"This is a test!").toString()
 list=[]
 list.append(lml)

 file_api= LogFileOperate("")
 db_api= LogDbOperate()
 file_api2=TwoDirectAdapter(file_api,db_api)
 db_api2=TwoDirectAdapter(file_api,db_api)
 db_api2.createLog(lml)

 allLog=db_api2.getAllLog()
 print "allLog:",
 print allLog
 file_api2.WriteLogFile(list)
 file_api2.readFile()