/brz/remove-bazaar

# 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