Add new Constraint for blacklisted attributes

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26721 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Constraint/AttributeBlacklisted.py

+##############################################################################
+#
+# Copyright (c) 2002, 2009 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 PropertyExistence import PropertyExistence
+from Products.CMFCore.Expression import Expression
+
+class AttributeBlacklisted(PropertyExistence):
+  """
+    This constraint class allows to check
+    attribute unicity.
+    Configuration example:
+    { 'id'            : 'title',
+      'description'   : 'Title must be unique',
+      'type'          : 'AttributeUnicity',
+      'title': "python: {'portal_type': object.getPortalType(), 'title': object.getTitle(), 'validation_state': 'validated'}",
+      'condition' : 'object/getTitle',
+    },
+  """
+
+  _message_id_list = ['message_invalid_attribute_blacklisted',]
+
+  message_invalid_attribute_blacklisted = "Attribute ${attribute_name}: "\
+       "value is blacklisted"
+
+  def checkConsistency(self, obj, fixit=0):
+    """Check the object's consistency.
+      We will make sure that each non None constraint_definition is 
+      satisfied (unicity)
+      This Constraint use portal_catalog
+    """
+    if not self._checkConstraintCondition(obj):
+      return []
+    errors = PropertyExistence.checkConsistency(self, obj, fixit=fixit)
+    for attribute_name, expression_criterion_dict in self.constraint_definition.items():
+      message_id = None
+      mapping = dict(attribute_name=attribute_name)
+      #Evaluate expression_criterion_dict
+      expression = Expression(expression_criterion_dict)
+      from Products.ERP5Type.Utils import createExpressionContext
+      econtext = createExpressionContext(obj)
+      criterion_dict = expression(econtext)
+      result = obj.portal_catalog.countResults(**criterion_dict)[0][0]
+      if result:
+        message_id = 'message_invalid_attribute_blacklisted'
+      # Generate error
+      if message_id is not None:
+        errors.append(self._generateError(obj,
+                        self._getMessage(message_id), mapping))
+    return errors
+

product/ERP5Type/Constraint/__init__.py

@@ -4,6 +4,7 @@ from CategoryMembershipArity import CategoryMembershipArity
 from CategoryRelatedMembershipArity import CategoryRelatedMembershipArity
 from AttributeEquality import AttributeEquality
 from AttributeUnicity import AttributeUnicity
+from AttributeBlacklisted import AttributeBlacklisted
 from PropertyExistence import PropertyExistence
 from CategoryExistence import CategoryExistence
 from CategoryExistence import CategoryAcquiredExistence