126 lines
3 KiB
Python
126 lines
3 KiB
Python
# scopes.storage.concept
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"""Core classes for concept map structure."""
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from zope.interface import implementer
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from scopes.interfaces import IContainer
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from scopes.storage.common import registerContainerClass, registry
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from scopes.storage.tracking import Container, Track
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class Concept(Track):
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headFields = ['name']
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def parents(self, predicate=None):
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return self.container.queryRels(second=self, predicate=predicate)
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def children(self, predicate=None):
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return self.container.queryRels(first=self, predicate=predicate)
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def values(self):
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return (t.getSecond() for t in self.children(Rels.defaultPredicate))
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class Concepts(Container):
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insertOnChange = False
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indexes = None
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def queryRels(self, **crit):
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pred = crit.get(predicate)
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if pred is not None and isinstance(pred, ('string', 'bytes')):
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crit['predicate'] = self.storage.getContainer('pred').queryLast(name=pred)
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for k, v in crit.items:
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if isinstance(v, Track):
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crit[k] = v.uid
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rels = self.storage.getContainer('rel')
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return rels.query(**crit)
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# implementation of relationships between concepts using RDF-like triples
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class Predicate(Concept):
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prefix = 'pred'
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@registerContainerClass
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class Predicates(Concepts):
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itemFactory = Predicate
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tableName = 'preds'
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class Triple(Track):
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headFields = ['first', 'second', 'predicate']
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prefix = 'rel'
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def getFirst(self):
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return self.container.storage.getItem(self.first)
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def getSecond(self):
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return self.container.storage.getItem(self.second)
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def getPredicate(self):
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return self.container.storage.getItem(self.second)
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@registerContainerClass
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class Rels(Container):
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itemFactory = Triple
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indexes = [('first', 'predicate', 'second'),
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('first', 'second'), ('predicate', 'second')]
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tableName = 'rels'
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insertOnChange = False
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defaultPredicate = 'standard'
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# types stuff
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@implementer(IContainer)
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class Type(Concept):
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headFields = ['name', 'tprefix']
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prefix = 'type'
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def values(self):
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cont = self.container.storage.getContainer(self.tprefix)
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return cont.query()
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def get(self, key, default=None):
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cont = self.container.storage.getContainer(self.tprefix)
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return cont.queryLast(name=key) or default
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def __getitem__(self, key):
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value = self.get(key)
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if value is None:
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raise KeyError(key)
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return value
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def __setitem__(self, key, value):
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cont = self.container.storage.getContainer(self.tprefix)
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value.name = key
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cont.save(value)
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@registerContainerClass
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class Types(Concepts):
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itemFactory = Type
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indexes = [('name',), ('tprefix',)]
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tableName = 'types'
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def storeType(storage, cls, name):
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types = storage.getContainer('type')
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types.save(Type(name, cls.prefix))
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def setupCoreTypes(storage):
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for c in registry.values():
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cls = c.itemFactory
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storeType(storage, cls, cls.__name__.lower())
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