#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  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
#

"""
Constraint definitions for restricting concepts and predicates available
for assignment as children or as concepts to resources.

$Id$
"""

from zope.cachedescriptors.property import Lazy
from zope.interface import implements
from zope.traversing.api import getName

from loops.common import AdapterBase, adapterAttributes, contextAttributes
from loops.constraint.interfaces import IStaticConstraint
from loops.type import TypeInterfaceSourceList


TypeInterfaceSourceList.typeInterfaces += (IStaticConstraint,)

isPredicate = 'ispredicateforconstraint'
isType = 'istypeforconstraint'
hasConstraint = 'hasconstraint'
hasChildConstraint = 'haschildconstraint'


class StaticConstraint(AdapterBase):

    _contextAttributes = contextAttributes(AdapterBase, 'relationType', 'cardinality')
    _adapterAttributes = adapterAttributes(AdapterBase, 'predicates', 'types')

    implements(IStaticConstraint)

    def getPredicates(self):
        return self.context.getChildren([isPredicate])
    def setPredicates(self, value):
        self.context.setChildren(isPredicate, value)
    predicates = property(getPredicates, setPredicates)

    def getTypes(self):
        return self.context.getChildren([isType])
    def setTypes(self, value):
        self.context.setChildren(isType, value)
    types = property(getTypes, setTypes)