Source code for persistent
##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
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"""Prefer C implementations of Persistent / PickleCache / TimeStamp.
Fall back to pure Python implementations.
"""
import sys
__all__ = [
'IPersistent',
'Persistent',
'GHOST',
'UPTODATE',
'CHANGED',
'STICKY',
'PickleCache',
'TimeStamp',
]
from persistent._compat import PURE_PYTHON
from persistent.interfaces import IPersistent
from persistent.interfaces import IPickleCache
import persistent.timestamp as TimeStamp
from persistent import persistence as pyPersistence
from persistent import picklecache as pyPickleCache
try:
# Be careful not to shadow the modules
from persistent import cPersistence as _cPersistence
from persistent import cPickleCache as _cPickleCache
except ImportError: # pragma: no cover
_cPersistence = None
_cPickleCache = None
else:
# Make an interface declaration for Persistent
# Note that the Python version already does this.
from zope.interface import classImplements
classImplements(_cPersistence.Persistent, IPersistent)
classImplements(_cPickleCache.PickleCache, IPickleCache)
_persistence = pyPersistence if PURE_PYTHON or _cPersistence is None else _cPersistence
_picklecache = pyPickleCache if PURE_PYTHON or _cPickleCache is None else _cPickleCache
Persistent = _persistence.Persistent
GHOST = _persistence.GHOST
UPTODATE = _persistence.UPTODATE
CHANGED = _persistence.CHANGED
STICKY = _persistence.STICKY
PickleCache = _picklecache.PickleCache
sys.modules['persistent.TimeStamp'] = sys.modules['persistent.timestamp']