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#
# Copyright (c) 2008 Canonical
#
# Written by Marc Tardif <marc@interunion.ca>
#
# This file is part of Checkbox.
#
# Checkbox is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Checkbox is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
class Cache(object):
def __init__(self, function):
self._cache = {}
self._function = function
def __get__(self, instance, cls=None):
self._instance = instance
return self
def __call__(self, *args):
if not self._cache.has_key((self._instance,) + args):
self._cache[(self._instance,) + args] = self._function(self._instance, *args)
return self._cache[(self._instance,) + args]
def cache(function):
return Cache(function)
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