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patch.py

##############################################################################
#
# Copyright (c) 2003-2005 struktur AG and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (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.
#
##############################################################################
"""
$Id: patch.py 20970 2006-03-18 01:57:43Z dreamcatcher $
"""

from Products.CMFSquidTool.utils import logger

log = logger.debug

PATTERN = '__cmfsquidtool_%s__'
def call(self, __name__, *args, **kw):
    return getattr(self, PATTERN % __name__)(*args, **kw)

WRAPPER = '__cmfsquidtool_is_wrapper_method__'
ORIG_NAME = '__cmfsquidtool_original_method_name__'
def isWrapperMethod(meth):
    return getattr(meth, WRAPPER, False)

def wrap_method(klass, name, method, pattern=PATTERN):
    old_method = getattr(klass, name)
    if isWrapperMethod(old_method):
        # Double-wrapping considered harmful.
        log('Already wrapped method %s.%s, skipping.' %
            (klass.__name__, name))
        return
    log('Wrapping method %s.%s' % (klass.__name__, name))
    new_name = pattern % name
    setattr(klass, new_name, old_method)
    setattr(method, ORIG_NAME, new_name)
    setattr(method, WRAPPER, True)
    setattr(klass, name, method)

def unwrap_method(klass, name):
    old_method = getattr(klass, name)
    if not isWrapperMethod(old_method):
        raise ValueError, ('Trying to unwrap non-wrapped '
                           'method %s.%s' % (klass.__name__, name))
    orig_name = getattr(old_method, ORIG_NAME)
    new_method = getattr(klass, orig_name)
    delattr(klass, orig_name)
    setattr(klass, name, new_method)

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