| David Scherer | 7aced17 | 2000-08-15 01:13:23 +0000 | [diff] [blame] | 1 | class Delegator: |
| 2 | |
| 3 | # The cache is only used to be able to change delegates! |
| 4 | |
| 5 | def __init__(self, delegate=None): |
| 6 | self.delegate = delegate |
| Terry Jan Reedy | acd5f81 | 2013-06-30 18:37:05 -0400 | [diff] [blame] | 7 | self.__cache = set() |
| David Scherer | 7aced17 | 2000-08-15 01:13:23 +0000 | [diff] [blame] | 8 | |
| 9 | def __getattr__(self, name): |
| 10 | attr = getattr(self.delegate, name) # May raise AttributeError |
| 11 | setattr(self, name, attr) |
| Terry Jan Reedy | acd5f81 | 2013-06-30 18:37:05 -0400 | [diff] [blame] | 12 | self.__cache.add(name) |
| David Scherer | 7aced17 | 2000-08-15 01:13:23 +0000 | [diff] [blame] | 13 | return attr |
| 14 | |
| 15 | def resetcache(self): |
| Kurt B. Kaiser | e071277 | 2007-08-23 05:25:55 +0000 | [diff] [blame] | 16 | for key in self.__cache: |
| David Scherer | 7aced17 | 2000-08-15 01:13:23 +0000 | [diff] [blame] | 17 | try: |
| 18 | delattr(self, key) |
| 19 | except AttributeError: |
| 20 | pass |
| 21 | self.__cache.clear() |
| 22 | |
| David Scherer | 7aced17 | 2000-08-15 01:13:23 +0000 | [diff] [blame] | 23 | def setdelegate(self, delegate): |
| 24 | self.resetcache() |
| 25 | self.delegate = delegate |