[Zope-Checkins] CVS: ZODB3/ZODB/zodb4 - conversion.py:1.1.2.4

[Fred L. Drake, Jr.]

Update of /cvs-repository/ZODB3/ZODB/zodb4
In directory cvs.zope.org:/tmp/cvs-serv5843

Modified Files:
      Tag: zope3-zodb3-devel-branch
	conversion.py 
Log Message:
first cut at handling the persistent reference format changes


=== ZODB3/ZODB/zodb4/conversion.py 1.1.2.3 => 1.1.2.4 ===
--- ZODB3/ZODB/zodb4/conversion.py:1.1.2.3	Fri Jan 30 12:32:13 2004
+++ ZODB3/ZODB/zodb4/conversion.py	Fri Jan 30 16:12:39 2004
@@ -13,7 +13,8 @@
 ##############################################################################
 """Nitty-gritty conversion of a ZODB 4 FileStorage to a ZODB 3 FileStorage."""
 
-from cPickle import dumps
+from cPickle import dumps, Pickler, Unpickler
+from cStringIO import StringIO
 
 from ZODB.FileStorage import FileStorage
 from ZODB.zodb4 import z4iterator
@@ -55,9 +56,47 @@
         return getattr(self._txn, name)
 
     def __iter__(self):
-        for record in iter(self._txn):
+        for record in self._txn:
             record.tid = record.serial
+            # transform the data record format
+            # (including persistent references)
+            sio = StringIO(record.data)
+            up = Unpickler(sio)
+            up.persistent_load = PersistentIdentifier
+            data = up.load()
+            sio = StringIO()
+            p = Pickler(sio)
+            p.persistent_id = get_persistent_id
+            p.dump(data)
+            record.data = sio.getvalue()
+            print repr(record.data)
             yield record
+
+
+class PersistentIdentifier:
+    def __init__(self, ident):
+        if isinstance(ident, tuple):
+            self._oid, self._class = ident
+            if isinstance(self._class, tuple):
+                self._class, self._args = self._class
+            else:
+                self._args = None
+        else:
+            assert isinstance(ident, str)
+            self._oid = ident
+            self._class = None
+
+
+def get_persistent_id(ob):
+    if isinstance(ob, PersistentIdentifier):
+        if ob._class is None:
+            return dumps(ob._oid)
+        elif ob._args is not None:
+            raise RuntimeError("can't handle __new__ args")
+        else:
+            return dumps((ob._oid, ob._class))
+    else:
+        return None
 
 
 def str8(s):