3c8b67a378
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@657 fd906abe-77d9-0310-91a1-e0d9ade77398
156 lines
4.5 KiB
Python
156 lines
4.5 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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Implementation of the utilities needed for the relations package.
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$Id$
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"""
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from persistent import Persistent
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from zope.interface import Interface, Attribute, implements
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from zope.app import zapi
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from zope.app.catalog.catalog import Catalog
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from zope.app.catalog.field import FieldIndex
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from zope.app.intid.interfaces import IIntIds
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from interfaces import IRelationsRegistry
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class DummyRelationsRegistry(object):
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""" Dummy implementation for demonstration and test purposes.
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"""
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implements(IRelationsRegistry)
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def __init__(self):
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self.relations = []
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def register(self, relation):
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if relation not in self.relations:
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self.relations.append(relation)
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def unregister(self, relation):
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if relation in self.relations:
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self.relations.remove(relation)
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def query(self, **kw):
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result = []
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for r in self.relations:
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hit = True
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for k in kw:
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if ((k == 'relationship' and r.__class__ != kw[k])
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or (k != 'relationship'
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and (not hasattr(r, k) or getattr(r, k) != kw[k]))):
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hit = False
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break
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if hit:
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result.append(r)
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return result
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class RelationsRegistry(Catalog):
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""" Local utility for registering (cataloguing) and searching relations.
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"""
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implements(IRelationsRegistry)
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indexesSetUp = False
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def setupIndexes(self):
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self['relationship'] = FieldIndex('relationship', IIndexableRelation)
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self['first'] = FieldIndex('first', IIndexableRelation)
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self['second'] = FieldIndex('second', IIndexableRelation)
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self['third'] = FieldIndex('third', IIndexableRelation)
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self.indexesSetUp = True
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def register(self, relation):
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if not self.indexesSetUp:
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self.setupIndexes()
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self.index_doc(_getUid(relation), relation)
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def unregister(self, relation):
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self.unindex_doc(_getUid(relation))
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def query(self, **kw):
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for k in kw:
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if k == 'relationship':
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quString = _getClassString(kw[k])
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else:
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quString = _getUid(kw[k])
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# set min, max
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kw[k] = (quString, quString)
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return self.searchResults(**kw)
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class IIndexableRelation(Interface):
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""" Provides the attributes needed for indexing relation objects in
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a catalog-based registry.
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"""
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class IndexableRelationAdapter(object):
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""" Adapter for providing the attributes needed for indexing
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relation objects.
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"""
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implements(IIndexableRelation)
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def __init__(self, context):
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self.context = context
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def getRelationship(self):
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return _getRelationship(self.context)
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relationship = property(getRelationship)
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def __getattr__(self, attr):
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value = getattr(self.context, attr)
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if isinstance(value, Persistent):
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return _getUid(value)
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else:
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return value
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# helper functions
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def _getUid(ob):
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return zapi.getUtility(IIntIds).getId(ob)
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def _getRelationship(relation):
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return _getClassString(relation.__class__)
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def _getClassString(cls):
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return cls.__module__ + '.' + cls.__name__
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# event handler
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def unregisterRelations(context, event):
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""" Handles IObjectRemoved event: unregisters all relations for the
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object that has been removed.
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"""
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relations = []
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registry = zapi.getUtility(IRelationsRegistry)
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for attr in ('first', 'second', 'third'):
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relations = registry.query(**{attr: context})
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for relation in relations:
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registry.unregister(relation)
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# to do: unregister relation also from the IntId utility
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# (if appropriate).
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