[Zope3-checkins] CVS: Zope3/src/zodb/code - class_.py:1.6.2.2

[Jeremy Hylton]

Update of /cvs-repository/Zope3/src/zodb/code
In directory cvs.zope.org:/tmp/cvs-serv3007/zodb/code

Modified Files:
      Tag: new-pickle-branch
	class_.py 
Log Message:
Convert raw objects to simple descriptors.

Need for attributes like __implements__.


=== Zope3/src/zodb/code/class_.py 1.6.2.1 => 1.6.2.2 ===
--- Zope3/src/zodb/code/class_.py:1.6.2.1	Tue Jan 21 17:35:45 2003
+++ Zope3/src/zodb/code/class_.py	Fri Jan 24 13:20:43 2003
@@ -28,6 +28,20 @@
 # separate sets of attributes.  This code should be documented, as it
 # it quite delicate, and it should be move to a separate module.
 
+class SimpleDescriptor(object):
+
+    def __init__(self, value):
+        self._value = value
+
+    def __get__(self, obj, cls):
+        return self._value
+
+    def __set__(self, obj, value):
+        self._value = value
+
+    def __delete__(self, obj):
+        del self._value
+
 class ExtClassDescr:
     """Maintains seperate class and instance descriptors for an attribute.
 
@@ -90,6 +104,10 @@
 class DataMixin:
 
     def __init__(self, name, descr, val):
+        if not hasattr(descr, "__get__"):
+            # If the object defined in the metaclass is not a descriptor,
+            # create one for it.
+            descr = SimpleDescriptor(descr)
         super(DataMixin, self).__init__(name, descr)
         self.val = val
 
@@ -194,7 +212,6 @@
     # GHOST instead of UPTODATE.  See __getnewargs__().
 
     def __new__(meta, name, bases, dict, state=UPTODATE):
-        # XXX make sure bases are not ghosts?
         cls = super(PersistentClassMetaClass, meta).__new__(
             meta, name, bases, dict)
         # helper functions