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103 lines
2.4 KiB
Python
103 lines
2.4 KiB
Python
# Authors:
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# Jason Gerard DeRose <jderose@redhat.com>
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#
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# Copyright (C) 2008 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; version 2 only
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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Base classes for plug-in architecture and generative API.
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"""
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import inspect
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import exceptions
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from base import NameSpace
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class Named(object):
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def __get_name(self):
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return self.__class__.__name__
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name = property(__get_name)
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class WithObj(Named):
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_obj = None
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__obj = None
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def __get_obj(self):
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return self.__obj
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def __set_obj(self, obj):
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if self.__obj is not None:
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raise exceptions.TwiceSetError(self.__class__.__name__, 'obj')
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assert isinstance(obj, Named)
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assert isinstance(self._obj, str)
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assert obj.name == self._obj
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self.__obj = obj
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assert self.obj is obj
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obj = property(__get_obj, __set_obj)
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class Command(WithObj):
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pass
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class Property(WithObj):
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pass
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class Object(Named):
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pass
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class Registrar(object):
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__object = None
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__commands = None
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__properties = None
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def __init__(self):
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self.__tmp_objects = {}
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self.__tmp_commands = {}
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self.__tmp_properties = {}
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def __get_objects(self):
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return self.__objects
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objects = property(__get_objects)
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def __get_commands(self):
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return self.__commands
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commands = property(__get_commands)
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def __get_target(self, i):
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if isinstance(i, Object):
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return (self.__tmp_objects, i.name)
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if isinstance(i, Command):
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return (self.__tmp_commands, i.name)
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assert isinstance(i, Property)
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def register(self, cls):
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assert inspect.isclass(cls)
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assert issubclass(cls, Named)
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i = cls()
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(target, key) = self.__get_target(i)
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target[key] = i
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def finalize(self):
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for cmd in self.__tmp_commands.values():
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if cmd._obj is None:
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continue
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obj = self.__tmp_objects[cmd._obj]
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cmd.obj = obj
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self.__objects = NameSpace(self.__tmp_objects)
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self.__commands = NameSpace(self.__tmp_commands)
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