110 lines
3.3 KiB
Python
110 lines
3.3 KiB
Python
#
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# Copyright (c) 2012 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 and management of special predicates and corresponding relations.
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"""
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from zope import component, schema
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from zope.component import adapts
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from zope.interface import implements
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from zope.cachedescriptors.property import Lazy
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from zope.dottedname.resolve import resolve
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from zope.security.proxy import removeSecurityProxy
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from zope.traversing.api import getName
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from loops.interfaces import ILoopsObject, IConcept, IResource, IConceptRelation
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from loops.interfaces import IPredicate, IRelationAdapter
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from loops.interfaces import IIsSubtype #, IMappingAttributeRelation
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from loops.concept import Concept
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from loops.common import adapted, AdapterBase
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from loops.type import TypeInterfaceSourceList
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TypeInterfaceSourceList.typeInterfaces += (IPredicate,)
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class Predicate(AdapterBase):
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""" typeInterface adapter for concepts of type 'predicate'.
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"""
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implements(IPredicate)
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_contextAttributes = list(IPredicate) # + list(IConcept)
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def getOptions(self):
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return getattr(self.context, '_options', [])
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def setOptions(self, value):
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self.context._options = value
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options = property(getOptions, setOptions)
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class PredicateInterfaceSourceList(TypeInterfaceSourceList):
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""" Collects type interfaces for predicates, i.e. interfaces that
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may be used for specifying additional attributes of relations.
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"""
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predicateInterfaces = ()
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@property
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def typeInterfaces(self):
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return self.predicateInterfaces
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class RelationAdapter(AdapterBase):
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""" Base class for adapters to relations that may be used for
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specifying additional attributes for relations.
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"""
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implements(IRelationAdapter)
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adapts(IConceptRelation)
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def adaptedRelation(relation):
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if isinstance(relation, RelationAdapter):
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return obj
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ifc = adapted(relation.predicate).predicateInterface
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if ifc is not None:
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adRelation = component.queryAdapter(relation, ifc)
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if adRelation is not None:
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return adRelation
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return relation
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# standard relation adapters
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PredicateInterfaceSourceList.predicateInterfaces += (
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IIsSubtype,)
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class IsSubtype(RelationAdapter):
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""" Allows specification of a predicate for relations between concepts
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of certain types.
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"""
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implements(IIsSubtype)
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_contextAttributes = list(IIsSubtype)
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#PredicateInterfaceSourceList.predicateInterfaces += (IMappingAttributeRelation,)
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#class MappingAttributeRelation(AdapterBase):
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#implements(IMappingAttributeRelation)
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#_contextAttributes = list(IMappingAttributeRelation)
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