stgit/lib/objcache.py

   1 class ObjectCache:
   2     """Cache for Python objects, for making sure that we create only one
   3     Python object per git object. This reduces memory consumption and
   4     makes object comparison very cheap."""
   5
   6     def __init__(self, create):
   7         self.__objects = {}
   8         self.__create = create
   9
  10     def __getitem__(self, name):
  11         if name not in self.__objects:
  12             self.__objects[name] = self.__create(name)
  13         return self.__objects[name]
  14
  15     def __contains__(self, name):
  16         return name in self.__objects
  17
  18     def __setitem__(self, name, val):
  19         assert name not in self.__objects
  20         self.__objects[name] = val