使用適配器模式使用兩個或是多個不兼容的接口兼容。在不修改不兼容代碼的情況下使用適配器模式實現(xiàn)接口一致性。通過Adapter 類實現(xiàn)。

例子： 一個俱樂部類Club，藝術(shù)加被請到俱樂部在表演節(jié)目： organize_performance（）

Musician類 play()? 方法? Dancer 類主要是dance() 方法執(zhí)行? （external.py）?

外部模塊導入（adapter.py）創(chuàng)建一個通用的? Adapter類調(diào)整不兼容的對象。

?__init__() 方法的obj 參數(shù)是需要修改的對象，adapted_methods 是一個字典，包含與客戶端調(diào)用的方法和應該調(diào)用方法匹配的鍵值對。

chapter04/external.py

class Musician: 
    def __init__(self, name): 
        self.name = name
 
    def __str__(self): 
        return f'the musician {self.name}' 
 
    def play(self): 
        return 'plays music' 
 
class Dancer: 
    def __init__(self, name): 
        self.name = name 
 
    def __str__(self): 
        return f'the dancer {self.name}' 
 
    def dance(self): 
        return 'does a dance performance' 

chapter04/adapter.py

from external import Musician, Dancer

 
class Club: 
    def __init__(self, name): 
        self.name = name 
 
    def __str__(self): 
        return f'the club {self.name}' 
 
    def organize_event(self): 
        return 'hires an artist to perform for the people' 

        
class Adapter: 
    def __init__(self, obj, adapted_methods): 
        self.obj = obj 
        self.__dict__.update(adapted_methods) 
 
    def __str__(self): 
        return str(self.obj) 

        
def main(): 

    objects = [Club('Jazz Cafe'), Musician('Roy Ayers'), Dancer('Shane Sparks')]
    
    for obj in objects:
        if hasattr(obj, 'play') or hasattr(obj, 'dance'):
            if hasattr(obj, 'play'):
                adapted_methods = dict(organize_event=obj.play)   # 設(shè)置調(diào)用方法統(tǒng)一organize_event
            elif hasattr(obj, 'dance'):            
                adapted_methods = dict(organize_event=obj.dance)    # 設(shè)置調(diào)用方法統(tǒng)一organize_event
                
            # referencing the adapted object here
            obj = Adapter(obj, adapted_methods)
            
        print(f' 輸出 {obj} {obj.organize_event()}')  # 調(diào)用統(tǒng)一方法

  
if __name__ == "__main__": 
    main()

?輸出 the club Jazz Cafe hires an artist to perform for the people
?輸出 the musician Roy Ayers plays music
?輸出 the dancer Shane Sparks does a dance performance文章來源地址http://www.zghlxwxcb.cn/news/detail-741597.html

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