added category existence

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2702 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Constraint/CategoryExistence.py

+##############################################################################
+#
+# Copyright (c) 2002 Nexedi SARL and Contributors. All Rights Reserved.
+#                    Sebastien Robin <seb@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 Constraint import Constraint
+
+class CategoryExistence(Constraint):
+    """
+    This method check and fix if an object respects the existence of a property.
+
+    For example we can check if every invoice line has a price defined on it.
+    """
+
+    def __init__(self, **constraint_definition):
+      """
+        We need the definition list of the constraint
+      """
+      self.constraint_definition = constraint_definition
+
+    def checkConsistency(self, object, fixit = 0):
+      """
+        this is the check method, we return a list of string,
+        each string corresponds to an error.
+      """
+
+      errors = []
+
+      # Retrieve values inside de PropertySheet (_constraints)
+      property_id = self.constraint_definition['base_category']
+
+      # Check arity and compare it with the min and max
+      error_message = None
+      if not object.hasCategory(base_category):
+          error_message = "Category existence error for base category '%s': " % property_id  \
+                + " this document has no such category"
+      elif object.getProperty(property_id) is None:
+          error_message = "Category existence error for base category '%s': " % property_id  \
+                + " this property was not defined"
+      if error_message:
+        errors = [(object.getRelativeUrl(), 'CategoryMembershipArity inconsistency',104, error_message)]
+      else:
+        errors = []
+        
+      return errors

product/ERP5Type/Constraint/__init__.py

@@ -4,3 +4,4 @@ from CategoryMembershipArity import CategoryMembershipArity
 from CategoryRelatedMembershipArity import CategoryRelatedMembershipArity
 from AttributeEquality import AttributeEquality
 from PropertyExistence import PropertyExistence
+from CategoryExistence import CategoryExistence
\ No newline at end of file