loops/concept.py
helmutm 7622600c99 Make typeProvider attribute available for concepts
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@1130 fd906abe-77d9-0310-91a1-e0d9ade77398
2006-03-19 09:49:47 +00:00

299 lines
9.5 KiB
Python

#
# Copyright (c) 2005 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
#
"""
Definition of the Concept and related classes.
$Id$
"""
from zope.app import zapi
from zope.app.container.btree import BTreeContainer
from zope.app.container.contained import Contained
from zope.cachedescriptors.property import Lazy
from zope.component import adapts
from zope.interface import implements
from zope.interface import alsoProvides, directlyProvides, directlyProvidedBy
from zope import schema
from zope.security.proxy import removeSecurityProxy
from persistent import Persistent
from cybertools.relation import DyadicRelation
from cybertools.relation.registry import getRelations
from cybertools.relation.registry import getRelationSingle, setRelationSingle
from cybertools.relation.interfaces import IRelationRegistry, IRelatable
from cybertools.typology.interfaces import IType, ITypeManager
from interfaces import IConcept, IConceptRelation, IConceptView
from interfaces import IConceptManager, IConceptManagerContained
from interfaces import ILoopsContained
from interfaces import IIndexAttributes
# relation classes
class BaseRelation(DyadicRelation):
def __init__(self, first, second, predicate=None):
super(BaseRelation, self).__init__(first, second)
if predicate is None:
context = first is not None and first or second
cm = context.getLoopsRoot().getConceptManager()
predicate = cm.getDefaultPredicate()
self.predicate = predicate
def getPredicateName(self):
baseName = super(BaseRelation, self).getPredicateName()
id = zapi.getUtility(IRelationRegistry).getUniqueIdForObject(self.predicate)
return '.'.join((baseName, str(id)))
class ConceptRelation(BaseRelation):
""" A relation between concept objects.
"""
implements(IConceptRelation)
class ResourceRelation(BaseRelation):
""" A relation between a concept and a resource object.
"""
implements(IConceptRelation)
# concept
class Concept(Contained, Persistent):
implements(IConcept, IConceptManagerContained, IRelatable)
proxyInterface = IConceptView
_title = u''
def getTitle(self): return self._title
def setTitle(self, title): self._title = title
title = property(getTitle, setTitle)
def getConceptType(self):
typePred = self.getConceptManager().getTypePredicate()
if typePred is None:
return None
parents = self.getParents([typePred])
# TODO (?): check for multiple types (->Error)
return parents and parents[0] or None
def setConceptType(self, concept):
current = self.getConceptType()
if current != concept:
typePred = self.getConceptManager().getTypePredicate()
if typePred is None:
raise ValueError('No type predicate found for '
+ zapi.getName(self))
if current is not None:
self.deassignParent(current, [typePred])
self.assignParent(concept, typePred)
conceptType = property(getConceptType, setConceptType)
def __init__(self, title=u''):
self.title = title
def getLoopsRoot(self):
return zapi.getParent(self).getLoopsRoot()
def getConceptManager(self):
return self.getLoopsRoot().getConceptManager()
# concept relations
def getChildRelations(self, predicates=None, child=None):
predicates = predicates is None and ['*'] or predicates
relationships = [ConceptRelation(self, None, p) for p in predicates]
# TODO: sort...
return getRelations(first=self, second=child, relationships=relationships)
def getChildren(self, predicates=None):
return [r.second for r in self.getChildRelations(predicates)]
def getParentRelations (self, predicates=None, parent=None):
predicates = predicates is None and ['*'] or predicates
relationships = [ConceptRelation(None, self, p) for p in predicates]
# TODO: sort...
return getRelations(first=parent, second=self, relationships=relationships)
def getParents(self, predicates=None):
return [r.first for r in self.getParentRelations(predicates)]
def assignChild(self, concept, predicate=None):
if predicate is None:
predicate = self.getConceptManager().getDefaultPredicate()
registry = zapi.getUtility(IRelationRegistry)
rel = ConceptRelation(self, concept, predicate)
registry.register(rel)
# TODO (?): avoid duplicates
def assignParent(self, concept, predicate=None):
concept.assignChild(self, predicate)
def deassignChild(self, child, predicates=None):
registry = zapi.getUtility(IRelationRegistry)
#relations = []
#for rs in relationships:
# relations.extend(registry.query(first=self, second=concept,
# relationship=rs))
for rel in self.getChildRelations(predicates, child):
registry.unregister(rel)
def deassignParent(self, parent, predicates=None):
parent.deassignChild(self, predicates)
# resource relations
def getResourceRelations(self, predicates=None, resource=None):
predicates = predicates is None and ['*'] or predicates
relationships = [ResourceRelation(self, None, p) for p in predicates]
# TODO: sort...
return getRelations(first=self, second=resource, relationships=relationships)
def getResources(self, predicates=None):
return [r.second for r in self.getResourceRelations(predicates)]
def assignResource(self, resource, predicate=None):
if predicate is None:
predicate = self.getConceptManager().getDefaultPredicate()
registry = zapi.getUtility(IRelationRegistry)
registry.register(ResourceRelation(self, resource, predicate))
# TODO (?): avoid duplicates
def deassignResource(self, resource, predicates=None):
registry = zapi.getUtility(IRelationRegistry)
for rel in self.getResourceRelations(predicates, resource):
registry.unregister(rel)
# concept manager
class ConceptManager(BTreeContainer):
implements(IConceptManager, ILoopsContained)
typeConcept = None
typePredicate = None
defaultPredicate = None
def getLoopsRoot(self):
return zapi.getParent(self)
def getTypePredicate(self):
return self.get('hasType')
def getTypeConcept(self):
if self.typeConcept is None:
self.typeConcept = self['type']
return self.typeConcept
def getDefaultPredicate(self):
if self.defaultPredicate is None:
self.defaultPredicate = self['standard']
return self.defaultPredicate
def getViewManager(self):
return self.getLoopsRoot().getViewManager()
# adapters and similar components
class ConceptSourceList(object):
implements(schema.interfaces.IIterableSource)
def __init__(self, context):
#self.context = context
self.context = removeSecurityProxy(context)
root = self.context.getLoopsRoot()
self.concepts = root.getConceptManager()
def __iter__(self):
for obj in self.concepts.values():
yield obj
def __len__(self):
return len(self.concepts)
class ConceptTypeSourceList(object):
implements(schema.interfaces.IIterableSource)
def __init__(self, context):
self.context = context
def __iter__(self):
return iter(self.conceptTypes)
@Lazy
def conceptTypes(self):
types = ITypeManager(self.context).listTypes(include=('concept',))
return [t.typeProvider for t in types]
def __len__(self):
return len(self.conceptTypes)
class PredicateSourceList(object):
implements(schema.interfaces.IIterableSource)
def __init__(self, context):
self.context = context
self.concepts = self.context.getLoopsRoot().getConceptManager()
def __iter__(self):
return iter(self.predicates)
@Lazy
def predicates(self):
result = []
cm = self.concepts
defPred = cm.getDefaultPredicate()
typePred = cm.getTypePredicate()
if defPred is not None and typePred is not None:
result.append(defPred)
result.append(typePred)
predType = defPred.conceptType
if predType is not None and predType != cm.getTypeConcept():
result.extend(p for p in predType.getChildren([typePred])
if p not in result)
return result
def __len__(self):
return len(self.conceptTypes)
class IndexAttributes(object):
implements(IIndexAttributes)
adapts(IConcept)
def __init__(self, context):
self.context = context
def text(self):
context = self.context
return ' '.join((zapi.getName(context), context.title,))
def title(self):
return self.text()