| # SPDX-License-Identifier: LGPL-2.1-or-later | |
| # /*************************************************************************** | |
| # * Copyright (c) 2016 Victor Titov (DeepSOIC) <vv.titov@gmail.com> * | |
| # * * | |
| # * This file is part of the FreeCAD CAx development system. * | |
| # * * | |
| # * This library is free software; you can redistribute it and/or * | |
| # * modify it under the terms of the GNU Library General Public * | |
| # * License as published by the Free Software Foundation; either * | |
| # * version 2 of the License, or (at your option) any later version. * | |
| # * * | |
| # * This library is distributed in the hope that it will be useful, * | |
| # * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
| # * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
| # * GNU Library General Public License for more details. * | |
| # * * | |
| # * You should have received a copy of the GNU Library General Public * | |
| # * License along with this library; see the file COPYING.LIB. If not, * | |
| # * write to the Free Software Foundation, Inc., 59 Temple Place, * | |
| # * Suite 330, Boston, MA 02111-1307, USA * | |
| # * * | |
| # ***************************************************************************/ | |
| # adapted from http://stackoverflow.com/a/3603824/6285007 | |
| class FrozenClass(object): | |
| """FrozenClass: prevents adding new attributes to class outside of __init__""" | |
| __isfrozen = False | |
| def __setattr__(self, key, value): | |
| if self.__isfrozen and not hasattr(self, key): | |
| raise TypeError( | |
| "{cls} has no attribute {attr}".format(cls=self.__class__.__name__, attr=key) | |
| ) | |
| object.__setattr__(self, key, value) | |
| def _freeze(self): | |
| self.__isfrozen = True | |
| def _unfreeze(self): | |
| self.__isfrozen = False | |