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##############################################################################
#
# Copyright (c) 2003 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.
#
##############################################################################
"""Hookable object support
"""
class _py_hookable(object):
__slots__ = ('_original', '_implementation')
def __init__(self, *args, **kw):
if len(args) == 0 and 'implementation' in kw:
args = (kw.pop('implementation'),)
if kw:
raise TypeError('Unknown keyword arguments')
if len(args) != 1:
raise TypeError('Exactly one argument required')
self._original = self._implementation = args[0]
original = property(lambda self: self._original)
implementation = property(lambda self: self._implementation)
def sethook(self, new_callable):
old, self._implementation = self._implementation, new_callable
return old
def reset(self):
self._implementation = self._original
def __call__(self, *args, **kw):
return self._implementation(*args, **kw)
hookable = _py_hookable
try:
from ._zope_hookable import hookable
except ImportError: #pragma NO COVER
pass