--- a/ztfy/utils/property.py	Wed Jun 20 16:29:53 2012 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,65 +0,0 @@
-### -*- coding: utf-8 -*- ####################################################
-##############################################################################
-#
-# Copyright (c) 2012 Thierry Florac <tflorac AT ulthar.net>
-# 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.
-#
-##############################################################################
-
-
-# import standard packages
-
-# import Zope3 interfaces
-
-# import local interfaces
-
-# import Zope3 packages
-
-# import local packages
-
-
-class cached(object):
-    """Custom property decorator to define a property or function
-    which is calculated only once
-       
-    When applied on a function, caching is based on input arguments
-    """
-
-    def __init__(self, function):
-        self._function = function
-        self._cache = {}
-
-    def __call__(self, *args):
-        try:
-            return self._cache[args]
-        except KeyError:
-            self._cache[args] = self._function(*args)
-            return self._cache[args]
-
-    def expire(self, *args):
-        del self._cache[args]
-
-
-class cached_property(object):
-    """A read-only @property decorator that is only evaluated once. The value is cached
-    on the object itself rather than the function or class; this should prevent
-    memory leakage.
-    """
-    def __init__(self, fget, doc=None):
-        self.fget = fget
-        self.__doc__ = doc or fget.__doc__
-        self.__name__ = fget.__name__
-        self.__module__ = fget.__module__
-
-    def __get__(self, obj, cls):
-        if obj is None:
-            return self
-        obj.__dict__[self.__name__] = result = self.fget(obj)
-        return result