From 560428be4f5852813972cd2791f425cf708ca7c6 Mon Sep 17 00:00:00 2001
From: Guido Trotter <ultrotter@google.com>
Date: Thu, 28 May 2009 10:10:11 +0100
Subject: [PATCH] objects: add configuration upgrade system
Add a very basic configuration update mechanism to objects.
An object can define the UpgradeConfig method, which will be called at
init time, and use it to fill in missing defaults in the configuration.
In the future we may want to make it more complex, for example adding
the config version, but for now a basic solution will do.
Signed-off-by: Guido Trotter <ultrotter@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>
---
lib/objects.py | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/lib/objects.py b/lib/objects.py
index aebe95960..15840f930 100644
--- a/lib/objects.py
+++ b/lib/objects.py
@@ -58,6 +58,7 @@ class ConfigObject(object):
def __init__(self, **kwargs):
for k, v in kwargs.iteritems():
setattr(self, k, v)
+ self.UpgradeConfig()
def __getattr__(self, name):
if name not in self.__slots__:
@@ -157,6 +158,15 @@ class ConfigObject(object):
"""Implement __repr__ for ConfigObjects."""
return repr(self.ToDict())
+ def UpgradeConfig(self):
+ """Fill defaults for missing configuration values.
+
+ This method will be called at object init time, and its implementation will
+ be object dependent.
+
+ """
+ pass
+
class TaggableObject(ConfigObject):
"""An generic class supporting tags.
--
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