Merge lp:~salgado/lazr.delegates/refactor-passthrough into lp:lazr.delegates

[Guilherme Salgado]

This just refactors PassThrough so that subclasses have a single place to modify when they want to change the way the context is obtained. I'm going to need this on https://code.edge.launchpad.net/~salgado/lazr.restful/extension-interfaces

Unmerged revisions

5. By Guilherme Salgado on 2010-07-14

Refactor Passthrough to have a single place which calls getattr(obj, self.contextvar) so that subclasses can easily change that

=== modified file 'src/lazr/delegates/_delegates.py'
--- src/lazr/delegates/_delegates.py	2009-04-14 16:07:52 +0000
+++ src/lazr/delegates/_delegates.py	2010-07-16 08:39:42 +0000
@@ -113,14 +113,17 @@
         self.name = name
         self.contextvar = contextvar
 
+    def _getContext(self, inst):
+        return getattr(inst, self.contextvar)
+
     def __get__(self, inst, cls=None):
         if inst is None:
             return self
         else:
-            return getattr(getattr(inst, self.contextvar), self.name)
+            return getattr(self._getContext(inst), self.name)
 
     def __set__(self, inst, value):
-        setattr(getattr(inst, self.contextvar), self.name, value)
+        setattr(self._getContext(inst), self.name, value)
 
     def __delete__(self, inst):
         raise NotImplementedError