game/util/worldobject.py

   1 # ###################################################
   2 # Copyright (C) 2008 The OpenAnno Team
   3 # team@openanno.org
   4 # This file is part of OpenAnno.
   5 #
   6 # OpenAnno is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the
  18 # Free Software Foundation, Inc.,
  19 # 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20 # ###################################################
  21
  22 import weakref
  23 from changelistener import Changelistener
  24
  25 class WorldObject(Changelistener):
  26         __next_id = 1
  27         __objects = weakref.WeakValueDictionary()
  28         def __init__(self, **kwargs):
  29                 super(WorldObject, self).__init__(**kwargs)
  30
  31         def getId(self):
  32                 if not hasattr(self, "_WorldObject__id"):
  33                         assert WorldObject.__next_id not in WorldObject.__objects
  34                         self.__id = WorldObject.__next_id
  35                         WorldObject.__next_id = WorldObject.__next_id + 1
  36                         WorldObject.__objects[self.__id] = self
  37                 return self.__id
  38
  39         @classmethod
  40         def getObjectById(cls, id):
  41                 return cls.__objects[id]
  42
  43         @classmethod
  44         def reset(cls):
  45                 cls.__next_id = 1
  46                 cls.__objects.clear()
  47
  48         def save(self, db):
  49                 pass
  50
  51         def load(self, db, worldid):
  52                 assert not hasattr(self, '_WorldObject__id')
  53                 assert worldid not in WorldObject.__objects
  54                 print 'loading worldobject', worldid, self
  55
  56                 self.__id = worldid
  57                 WorldObject.__objects[worldid] = self
  58
  59                 # Make sure that new WorldIDs are always higher than every other WorldObject
  60                 WorldObject.__next_id = max(self.__next_id, worldid + 1)
  61
  62         # for testing:
  63         @classmethod
  64         def get_objs(self): return self.__objects