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# Authors:
# Jason Gerard DeRose <jderose@redhat.com>
#
# Copyright (C) 2008 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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; version 2 only
#
# 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
"""
Base classes for plug-in architecture and generative API.
"""
import inspect
import exceptions
from base import NameSpace
class Named(object):
def __get_name(self):
return self.__class__.__name__
name = property(__get_name)
class WithObj(Named):
_obj = None
__obj = None
__obj_locked = False
def __get_obj(self):
return self.__obj
def __set_obj(self, obj):
if self.__obj_locked:
raise exceptions.TwiceSetError(self.__class__.__name__, 'obj')
self.__obj_locked = True
if obj is None:
assert self.__obj is None
assert self.obj is None
else:
assert isinstance(obj, Named)
assert isinstance(self._obj, str)
assert obj.name == self._obj
self.__obj = obj
assert self.obj is obj
obj = property(__get_obj, __set_obj)
class Command(WithObj):
pass
class Property(WithObj):
pass
class Object(Named):
pass
class Registrar(object):
__object = None
__commands = None
__properties = None
def __init__(self):
self.__tmp_objects = {}
self.__tmp_commands = {}
self.__tmp_properties = {}
def __get_objects(self):
return self.__objects
objects = property(__get_objects)
def __get_commands(self):
return self.__commands
commands = property(__get_commands)
def __get_target(self, i):
if isinstance(i, Object):
return (self.__tmp_objects, i.name)
if isinstance(i, Command):
return (self.__tmp_commands, i.name)
assert isinstance(i, Property)
def register(self, cls):
assert inspect.isclass(cls)
assert issubclass(cls, Named)
i = cls()
(target, key) = self.__get_target(i)
target[key] = i
def finalize(self):
for cmd in self.__tmp_commands.values():
if cmd._obj is None:
cmd.obj = None
else:
obj = self.__tmp_objects[cmd._obj]
cmd.obj = obj
self.__objects = NameSpace(self.__tmp_objects)
self.__commands = NameSpace(self.__tmp_commands)
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