game/util/living.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 class livingProperty(object):
  23         def __init__(self):
  24                 self.values = {}
  25
  26         def __get__(self, obj, cls=None):
  27                 return self.values.get(obj, None)
  28
  29         def __set__(self, obj, value):
  30                 if obj in self.values and hasattr(self.values[obj], 'end'):
  31                         self.values[obj].end()
  32                 if value is None:
  33                         del self.values[obj]
  34                 else:
  35                         self.values[obj] = value
  36                         if hasattr(value, 'begin'):
  37                                 print 'Beginning:', value
  38                                 tmp1, tmp2 = value._livingObject_args, value._livingObject_kwargs
  39                                 del value._livingObject_args
  40                                 del value._livingObject_kwargs
  41                                 value.begin(*tmp1, **tmp2)
  42
  43         def __delete__(self, obj):
  44                 self.__set__(obj, None)
  45
  46 class livingObject(object):
  47         def __init__(self, *args, **kwargs):
  48                 print 'Initing:', self
  49                 super(livingObject, self).__init__()
  50                 self._livingObject_args = args
  51                 self._livingObject_kwargs = kwargs
  52
  53         def begin(self):
  54                 pass
  55
  56         def end(self):
  57                 for p in self.__dict__.keys()[:]:
  58                         delattr(self, p)
  59                 self._is_ended = True
  60
  61         def __del__(self):
  62                 if not (hasattr(self, '_is_ended') and self._is_ended):
  63                         print "Warning: Object %s is not ended but no reference is left." % (repr(self),)