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985c397 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | # 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
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