Commit 0475cb1d authored by Jim Fulton's avatar Jim Fulton

added new undo method, undoInfo

parent db862e0d
......@@ -84,19 +84,20 @@
##############################################################################
"""Database objects
$Id: DB.py,v 1.18 1999/10/07 19:48:18 jim Exp $"""
__version__='$Revision: 1.18 $'[11:-2]
$Id: DB.py,v 1.19 1999/11/23 22:55:54 jim Exp $"""
__version__='$Revision: 1.19 $'[11:-2]
import cPickle, cStringIO, sys, POSException
import cPickle, cStringIO, sys, POSException, UndoLogCompatible
from Connection import Connection
from bpthread import allocate_lock
from Transaction import Transaction
from referencesf import referencesf
from time import time, ctime
StringType=type('')
class DB:
class DB(UndoLogCompatible.UndoLogCompatible):
"""The Object Database
The Object database coordinates access to and interaction of one
......@@ -158,6 +159,8 @@ class DB:
'versionEmpty', 'versions'):
setattr(self, m, getattr(storage, m))
if hasattr(storage, 'undoInfo'):
self.undoInfo=storage.undoInfo
def _cacheMean(self, attr):
m=[0,0]
......
##############################################################################
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##############################################################################
"""Provide backward compatability with storages that have undoLog, but not undoInfo."""
class UndoLogCompatible:
def undoInfo(self, first, last, specification):
def filter(desc, spec=specification.items()):
get=desc.get
for k, v in spec:
if get(k, None) != v:
return 0
return 1
return self.undoLog(first, last, filter)
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