make the correct base class implement IWriteLock

lib/python/webdav/Lockable.py

@@ -19,11 +19,13 @@ from AccessControl import ClassSecurityInfo
 from Globals import InitializeClass
 from Globals import PersistentMapping
 import Acquisition
+from zope.interface import implements
 
 from EtagSupport import EtagSupport
 from WriteLockInterface import LockItemInterface
 from WriteLockInterface import WriteLockInterface
 
+from interfaces import IWriteLock
 
 class ResourceLockedError(Exception): pass
 
@@ -36,6 +38,7 @@ class LockableItem(EtagSupport):
 
     __implements__ = (WriteLockInterface,)
     """
+    implements(IWriteLock)
 
     # Protect methods using declarative security
     security = ClassSecurityInfo()

lib/python/webdav/Resource.py

@@ -35,7 +35,6 @@ from common import IfParser
 from common import isDavCollection
 from common import Locked, Conflict, PreconditionFailed
 from interfaces import IDAVResource
-from interfaces import IWriteLock
 from WriteLockInterface import WriteLockInterface
 
 
@@ -47,7 +46,7 @@ class Resource(ExtensionClass.Base, Lockable.LockableItem):
     such as PUT should be overridden to ensure correct behavior in
     the context of the object type."""
 
-    implements(IDAVResource, IWriteLock)
+    implements(IDAVResource)
 
     __dav_resource__=1