组合模式

 1 class IFile(object):
 2     def __init__(self,name):
 3         self._name = name
 4     def Add(self,com):
 5         pass
 6     def Display(self,nDepth):
 7         pass
 8 
 9 class File(IFile):
10     def Add(self,file):
11         print "can‘t add file"
12     def Display(self,nDepth):
13         strtemp = ""
14         for i in range(nDepth):
15             strtemp = strtemp + "-"
16         strtemp = strtemp + self._name
17         print strtemp
18 
19 class Folder(IFile):
20     def __init__(self, name):
21         super(Folder, self).__init__(name)
22         #self._name = name
23         self._filelist = []
24 
25     def Add(self,file):
26         self._filelist.append(file)
27     def Display(self,nDepth):
28         strtemp = ""
29         for i in range(nDepth):
30             strtemp = strtemp + "-"
31         strtemp = strtemp + self._name
32         print strtemp
33         for file in self._filelist:
34             file.Display(nDepth + 2)
35 
36 if __name__ == "__main__":
37     p = Folder("FolderOne")
38     p.Add(File("FolderOne_file1"))
39     p.Add(File("FolderOne_file2"))
40     
41     p2 = Folder(‘FolderTwo‘)
42     p.Add(p2)
43 
44     p1 = Folder("FolderThree")
45     p1.Add(File("FolderThree_file1"))
46     
47     p2.Add(p1)
48     
49     p.Display(1);