Add compatibility with Zope 2.8 for Business Templates. If this causes any...

Add compatibility with Zope 2.8 for Business Templates. If this causes any problem, try to remove the import in ZopePatch.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@12946 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ZopePatch.py

@@ -47,6 +47,8 @@ from Products.ERP5Type.patches import CMFCoreSkinnable
 from Products.ERP5Type.patches import CMFCoreSkinsTool
 from Products.ERP5Type.patches import OFSFolder
 from Products.ERP5Type.patches import HTTPRequest
+from Products.ERP5Type.patches import Connection
+from Products.ERP5Type.patches import copy_reg_patch
 
 # These symbols are required for backward compatibility
 from Products.ERP5Type.patches.PropertyManager import ERP5PropertyManager

product/ERP5Type/patches/Connection.py

+##############################################################################
+#
+# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
+# Copyright (c) 2007 Nexedi SA
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE
+#
+##############################################################################
+
+"""This patch is for importing Business Templates generated by Zope 2.8
+into Zope 2.7.
+
+In Zope 2.7, the class of an object was represented by a tuple (module, name),
+but this has been changed to just a class name itself.
+"""
+
+try:
+    # This portion depends on ZODB, so the version test is based on
+    # the ZODB's structure. In ZODB 3.4 and later, the object serialization
+    # is segregated to serialize.py, while it is in Connection.py in ZODB 3.2.
+    from ZODB import serialize
+    del serialize
+except ImportError:
+    from ZODB.Connection import Connection, StringIO, Unpickler, ExtensionKlass
+
+    def __getitem__(self, oid, tt=type(())):
+        obj = self._cache.get(oid, None)
+        if obj is not None:
+            return obj
+
+        __traceback_info__ = (oid)
+        p, serial = self._storage.load(oid, self._version)
+        __traceback_info__ = (oid, p)
+        file=StringIO(p)
+        unpickler=Unpickler(file)
+        unpickler.persistent_load=self._persistent_load
+
+        object = unpickler.load()
+
+        # <patch author="yo">
+        if type(object) is tt:
+            klass, args = object
+        else:
+            klass = object
+            args = None
+        # </patch>
+
+        if type(klass) is tt:
+            module, name = klass
+            klass=self._db._classFactory(self, module, name)
+
+        if (args is None or
+            not args and not hasattr(klass,'__getinitargs__')):
+            object=klass.__basicnew__()
+        else:
+            object = klass(*args)
+            if klass is not ExtensionKlass:
+                object.__dict__.clear()
+
+        object._p_oid=oid
+        object._p_jar=self
+        object._p_changed=None
+        object._p_serial=serial
+
+        self._cache[oid] = object
+        return object
+
+    Connection.__getitem__ = __getitem__

product/ERP5Type/patches/copy_reg_patch.py

+##############################################################################
+#
+# Copyright (c) 2007 Nexedi SA and Contributors. All Rights Reserved.
+#                    Yoshinori Okuji <yo@nexedi.com>
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsability of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# garantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+
+"""This is another patch for importing Business Templates generated by Zope 2.8
+into Zope 2.7. Also, look at Connection.py for the other part.
+
+In Zope 2.8 (i.e. ZODB 3.4), persistent objects are based on new-style class,
+while Zope 2.7 (i.e. ZODB 3.2) uses old-style class only. To instantiate
+objects in ZODB 3.4 and later, copy_reg.__newobj__ is utilized, which
+supports only new-style class. On the other hand, ZODB 3.2 makes an empty
+object by calling the class object with None.
+
+However, this is based on the analysis of some observation, and theoretically
+not very certain. There might be an occasion where non-None arguments are
+used to instantiate a ghost object. I am not sure. If this is not true,
+we must patch __newobj__ differently.
+
+Note that this file is named copy_reg_patch instead of copy_reg by intention.
+Otherwise, importing copy_reg results in importing itself. SO DO NOT RENAME
+THIS FILE TO copy_reg.py.
+"""
+
+try:
+    from ZODB import serialize
+    del serialize
+except ImportError:
+    import copy_reg
+
+    original_newobj = copy_reg.__newobj__
+    def __newobj__(cls, *args):
+        # If this method is used for new-style class, call the original.
+        # Otherwise, just call the class object with None.
+        if issubclass(cls, object):
+            return original_newobj(cls, *args)
+        return cls(None)
+
+    copy_reg.__newobj__ = __newobj__