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# Copyright (C) 2006 by Canonical Ltd
# Authors: Robert Collins <robert.collins@canonical.com>
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Symbol versioning
The methods here allow for api symbol versioning.
"""
__all__ = ['warn', 'set_warning_method', 'zero_seven']
from warnings import warn
zero_seven = "%s was deprecated in version 0.7"
def set_warning_method(method):
"""Set the warning method to be used by this module.
It should take a message and a warning category as warnings.warn does.
"""
global warn
warn = method
def deprecated_method(deprecation_version):
"""Decorate a method so that use of it will trigger a warning.
To deprecate an entire class, decorate __init__.
"""
def method_decorator(callable):
"""This is the function python calls to perform the decoration."""
def decorated_method(self, *args, **kwargs):
"""This is the decorated method."""
symbol = "%s.%s.%s" % (self.__class__.__module__,
self.__class__.__name__,
callable.__name__
)
warn(deprecation_version % symbol, DeprecationWarning)
return callable(self, *args, **kwargs)
return decorated_method
return method_decorator
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