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dependency.py
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dependency.py
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##############################################################################
#
# Copyright (c) 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.
#
##############################################################################
"""Subscriber function checking dependencies if a removal is performed
on an object having dependencies. It raises an exception if it's the
case.
"""
__docformat__ = 'restructuredtext'
from zope.i18nmessageid import Message
from zope.i18nmessageid import MessageFactory
from zope.location.interfaces import ILocationInfo
from zope.app.dependable.interfaces import IDependable, DependencyError
_ = MessageFactory('zope')
exception_msg = _("""
Removal of object (${object}) which has dependents (${dependents})
is not possible !
You must deactivate this object before trying to remove it.
""")
def CheckDependency(event):
object = event.object
dependency = IDependable(object, None)
if dependency is not None:
dependents = dependency.dependents()
if dependents:
mapping = {
"object": ILocationInfo(object).getPath(),
"dependents": ", ".join(dependents)
}
raise DependencyError(Message(exception_msg, mapping=mapping))