15: Added ipalib.base2 module where I'm experimenting with a 3rd approach that is a hybrid of the first two: a decoupled late binding OO strategy

1 files changed, 102 insertions, 0 deletions

diff --git a/ipalib/base2.py b/ipalib/base2.py
new file mode 100644
index 00000000..fa5536bd
--- /dev/null
+++ b/ipalib/base2.py
@@ -0,0 +1,102 @@
+# 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
+
+	def __get_obj(self):
+		return self.__obj
+	def __set_obj(self, obj):
+		if self.__obj is not None:
+			raise exceptions.TwiceSetError(self.__class__.__name__, 'obj')
+		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:
+				continue
+			obj = self.__tmp_objects[cmd._obj]
+			cmd.obj = obj
+		self.__objects = NameSpace(self.__tmp_objects)
+		self.__commands = NameSpace(self.__tmp_commands)