edf3e0ecf6
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@849 fd906abe-77d9-0310-91a1-e0d9ade77398
95 lines
No EOL
2.8 KiB
Python
95 lines
No EOL
2.8 KiB
Python
#
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# Copyright (c) 2005 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Definition of the View and related classses.
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$Id$
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"""
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from zope.app import zapi
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from zope.app.container.btree import BTreeContainer
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from zope.app.container.contained import Contained
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from zope.app.container.ordered import OrderedContainer
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from zope.interface import implements
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from persistent import Persistent
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from cybertools.relation import DyadicRelation
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from cybertools.relation.registry import IRelationsRegistry, getRelations
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from interfaces import IView, INode
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from interfaces import IViewManager, INodeContained
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from interfaces import ILoopsContained
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class View(object):
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implements(IView, INodeContained)
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_title = u''
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def getTitle(self): return self._title
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def setTitle(self, title): self._title = title
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title = property(getTitle, setTitle)
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_description = u''
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def getDescription(self): return self._description
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def setDescription(self, description): self._description = description
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description = property(getDescription, setDescription)
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def getTarget(self):
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rels = getRelations(first=self)
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if len(rels) == 0:
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return None
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if len(rels) > 1:
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raise ValueError, 'There may be only one target for a View object.'
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return rels.next().second
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def setTarget(self, target):
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return
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registry = zapi.getUtility(IRelationsRegistry)
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rels = registry.query(first=self)
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if len(rels) > 0:
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if rels[0].second != target:
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registry.unregister(target)
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else:
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rel = relationship(self, concept)
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registry.register(rel)
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target = property(getTarget, setTarget)
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def __init__(self, title=u'', description=u''):
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self.title = title
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self.description = description
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super(View, self).__init__()
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class Node(View, OrderedContainer):
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implements(INode)
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class ViewManager(BTreeContainer):
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implements(IViewManager, ILoopsContained)
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class TargetRelation(DyadicRelation):
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""" A relation between a view and a concept or resource object.
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"""
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