add a new module to try to isolate code needed for accessor generation.

The point is to try to cluster things, in order to avoid a Utils-like mess.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42804 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/dynamic/accessor_holder.py

+##############################################################################
+#
+# Copyright (c) 2011 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Nicolas Dumazet <nicolas.dumazet@nexedi.com>
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility 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
+# guarantees 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+##############################################################################
+"""
+This module should include most code related to the generation of
+Accessor Holders, that is, generation of methods for ERP5
+
+* Ideally, PropertyHolder class should be defined here, as well
+as a base class for all erp5.accessor_holder Accessor Holders.
+* Utils, Property Sheet Tool can be probably be cleaned up as well by
+moving specialized code here.
+"""
+from Products.ERP5Type.Base import PropertyHolder
+from Products.ERP5Type.Utils import createRelatedAccessors, createExpressionContext
+
+generating_base_accessors = False
+def _generateBaseAccessorHolder(portal,
+    property_sheet_tool, accessor_holder_module):
+  base_accessor_holder_id = 'BaseAccessorHolder'
+
+  accessor_holder = getattr(accessor_holder_module,
+                            base_accessor_holder_id,
+                            None)
+  if accessor_holder is not None:
+    return accessor_holder
+
+  global generating_base_accessors
+  if generating_base_accessors:
+    # can cause recursion, as accessing categories generates category properties
+    return None
+  generating_base_accessors = True
+
+  portal_categories = getattr(portal, 'portal_categories', None)
+  if portal_categories is None:
+    generating_base_accessors = False
+    return None
+
+  base_category_list = portal_categories.objectIds()
+
+  property_holder = PropertyHolder()
+
+  econtext = createExpressionContext(portal, portal)
+  createRelatedAccessors(portal_categories,
+                         property_holder,
+                         econtext,
+                         base_category_list)
+
+  accessor_holder = property_sheet_tool._createCommonPropertySheetAccessorHolder(
+                      property_holder,
+                      base_accessor_holder_id,
+                      'erp5.accessor_holder',
+                      skip_default=True)
+  setattr(accessor_holder_module, base_accessor_holder_id, accessor_holder)
+  generating_base_accessors = False
+  return accessor_holder
+
+def _generatePreferenceToolAccessorHolder(accessor_holder_list,
+    property_sheet_tool, accessor_holder_module):
+  property_holder = PropertyHolder()
+
+  from Products.ERP5Type.Accessor.TypeDefinition import list_types
+  from Products.ERP5Type.Utils import convertToUpperCase
+  from Products.ERP5Form.PreferenceTool import PreferenceMethod
+
+  for accessor_holder in accessor_holder_list:
+    for prop in accessor_holder._properties:
+      if prop.get('preference'):
+        # XXX read_permission and write_permissions defined at
+        # property sheet are not respected by this.
+        # only properties marked as preference are used
+        attribute = prop['id']
+        attr_list = [ 'get%s' % convertToUpperCase(attribute)]
+        if prop['type'] == 'boolean':
+          attr_list.append('is%s' % convertToUpperCase(attribute))
+        if prop['type'] in list_types :
+          attr_list.append('get%sList' % convertToUpperCase(attribute))
+        read_permission = prop.get('read_permission')
+        for attribute_name in attr_list:
+          method = PreferenceMethod(attribute_name, prop.get('default'))
+          setattr(property_holder, attribute_name, method)
+          if read_permission:
+            property_holder.declareProtected(read_permission, attribute_name)
+
+  accessor_holder = property_sheet_tool._createCommonPropertySheetAccessorHolder(
+                      property_holder,
+                      'PreferenceTool',
+                      'erp5.accessor_holder',
+                      skip_default=True)
+  setattr(accessor_holder_module, 'PreferenceTool', accessor_holder)
+  return accessor_holder
+