Add mixin for documentis which are implement both IFile and IBaseConvertable interfaces

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35215 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/mixin/base_convertable_and_file.py

+# -*- coding: utf-8 -*-
+##############################################################################
+#
+# Copyright (c) 2010 Nexedi SA and Contributors. All Rights Reserved.
+#                    Nicolas Delaby <nicolas@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.
+#
+##############################################################################
+from AccessControl import ClassSecurityInfo
+from Products.ERP5Type import Permissions
+
+_MARKER = []
+class BaseConvertableAndFileMixin:
+  security = ClassSecurityInfo()
+
+  security.declareProtected(Permissions.AccessContentsInformation,
+                                                                 'getBaseData')
+  def getBaseData(self, default=_MARKER):
+    """return BaseData as str."""
+    if default is _MARKER:
+      base_data = self._baseGetBaseData()
+    else:
+      base_data = self._baseGetBaseData(default)
+    if base_data is None:
+      return None
+    else:
+      return str(base_data)
+
+  security.declareProtected(Permissions.ModifyPortalContent, '_setBaseData')
+  def _setBaseData(self, data):
+    """
+      This is a method which combine base_convertable interface and File API
+    """
+    if not isinstance(data, Pdata) and data is not None:
+      file = cStringIO.StringIO(data)
+      data, size = self._read_data(file)
+      self._setSize(size)
+    self._baseSetBaseData(data)