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##############################################################################
#
# Copyright (c) 2003-2009 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.
#
##############################################################################
"""Location copying/pickling support
"""
__docformat__ = 'restructuredtext'
from zope.interface import implementer
from zope.location.location import inside
try:
from zope.copy.interfaces import ICopyHook, ResumeCopy
except ImportError: # pragma: no cover
raise NotImplementedError("zope.location.pickling is not supported "
"because zope.copy is not available")
@implementer(ICopyHook)
class LocationCopyHook(object):
"""Copy hook to preserve copying referenced objects that are not
located inside object that's being copied.
"""
def __init__(self, context):
self.context = context
def __call__(self, toplevel, register):
if not inside(self.context, toplevel):
return self.context
raise ResumeCopy
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