##############################################################################
#
# Copyright (c) 2008 Nexedi SA and Contributors. All Rights Reserved.
#                    Rafael Monnerat <rafael@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.
#
##############################################################################


class DocumentConstraint:
  """Constraints for Documents
  """

  _constraints = (
    { 'id': 'assignor_existence',
      'description': 'Documents should have one group or use one project as \
                      Follow Up relation',
      'expression' : 'python: len(object.getFollowUpList()) > 0 \
	              or len(object.getGroupList()) > 0',
      'type': 'TALESConstraint',
      'message_expression_false': 'Follow Up or Group must be defined',
    },
 )