edd2b3fbe4
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@3165 fd906abe-77d9-0310-91a1-e0d9ade77398
76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
#
|
|
# Copyright (c) 2009 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
|
|
#
|
|
|
|
"""
|
|
Specialized field definitions.
|
|
|
|
$Id$
|
|
"""
|
|
|
|
from zope.component import adapts
|
|
from zope.interface import Attribute, implements
|
|
from zope.schema import Choice, List
|
|
from zope.schema.interfaces import IChoice, IList
|
|
|
|
from cybertools.composer.schema.interfaces import FieldType
|
|
|
|
|
|
class IRelation(IChoice):
|
|
""" An object addressed via a single relation.
|
|
"""
|
|
|
|
target_types = Attribute('A list of names that denote types of '
|
|
'loops objects (typically concept types) that may be used as '
|
|
'targets for the relation.')
|
|
|
|
|
|
class IRelationSet(IList):
|
|
""" A collection of objects addressed via a set of relations.
|
|
|
|
Despite its name, the collection may have a predefined order.
|
|
"""
|
|
|
|
target_types = Attribute('A list of names that denote types of '
|
|
'loops objects (typically concept types) that may be used as '
|
|
'targets for the relations.')
|
|
|
|
|
|
class Relation(Choice):
|
|
|
|
implements(IRelation)
|
|
|
|
__typeInfo__ = ('relation',)
|
|
|
|
def __init__(self, *args, **kw):
|
|
self.target_types = kw.pop('target_types')
|
|
super(Relation, self).__init__(*args, **kw)
|
|
|
|
|
|
class RelationSet(List):
|
|
|
|
implements(IRelationSet)
|
|
|
|
__typeInfo__ = ('relationset',
|
|
FieldType('relationset', 'relationset',
|
|
u'A field representing a sequence of related objects.',
|
|
instanceName='relationset'))
|
|
|
|
def __init__(self, *args, **kw):
|
|
self.target_types = kw.pop('target_types')
|
|
super(RelationSet, self).__init__(*args, **kw)
|
|
|