def removeFromSesameRep(self, repository, ctx='default', rdfType=None):
"""
remove triples (s,p,o) such as
- s has an uri hosted by self
- o has an uri hosted by self
- p has an uri hosted by seld
"""
# lets use the context posibility, should be useless
if ctx == None and not getattr(settings, 'PES_USE_CONTEXT', False):
sesame = Repository(repository)
else:
if ctx == 'default' or getattr(settings, 'PES_USE_CONTEXT', False):
ctx = self.defaultCtxName
ctx = "<%s>" % ctx
sesame = Repository(repository, context=ctx)
subjects = sesame.subjects(settings.NS.rdf.type, rdfType)
for subject in subjects:
if self.is_local(subject):
sesame.remove((subject, None, None))
preds = sesame.predicates(None, None)
for p in preds:
if self.is_local(p):
sesame.remove((None, p, None))
objs = sesame.objects(None, None)
for o in objs:
if isinstance(o, URIRef) and self.is_local(o):
sesame.remove((None, None, o))
# Suppress also instance in db
for m in models.get_models():
if djrdf.models.djRdf in m.__mro__:
for o in m.objects.filter(uri__contains=self.home):
o.delete()
def toSesameRep(self, repository, graph, ctx='default', rdfType=None, force=False):
# lets use the context posibility, should be useless
if ctx == None and not getattr(settings, 'PES_USE_CONTEXT', False):
sesame = Repository(repository)
else:
if ctx == 'default' or getattr(settings, 'PES_USE_CONTEXT', False):
ctx = self.defaultCtxName
ctx = "<%s>" % ctx
sesame = Repository(repository, context=ctx)
unknownTypes = []
mapDjrdfTypes = djrdf.tools.rdfDjrdfMapTypes()
subjects = graph.subjects(settings.NS.rdf.type, rdfType)
for subject in subjects:
# small delay to let jetty warmup
time.sleep(0.01)
stored_date = list(sesame.objects(subject, settings.NS.dct.modified))
update_date = list(graph.objects(subject, settings.NS.dct.modified))
replacedBy = list(graph.objects(subject, settings.NS.dct.isReplacedBy))
deletedOn = list(graph.objects(subject, settings.NS.ov.deletedOn))
if (not force) and len(update_date) == 1 and len(stored_date) == 1 and update_date[0].toPython() <= stored_date[0].toPython():
log.debug(u"Nothing to update for %s" % subject)
else:
log.debug("Handle %s in %s" % (subject, repository))
types = list(graph.objects(subject, settings.NS.rdf.type))
# look for a type corresponding to a mapped RDFAlchemy model
RdfModel, djRdfModel = None, None
i = 0
n = len(types)
while i < n and not RdfModel:
str_type = str(types[i])
if str_type in mapper():
RdfModel = mapper()[str_type]
i += 1
if not RdfModel:
unknownTypes.extend(types)
# look for and djRdf.models corresponding to that type
if RdfModel:
try:
djRdfModel = mapDjrdfTypes[RdfModel.rdf_type]
except KeyError:
djRdfModel = None
# If a triple <old_uri> dct.isReplacedBy <new_uri> exists, this supposed
# the new_uri is up_to_date and the 'domain' which was hosting old_uri
# aggrees this renaming of uri. The aggregator has just to registered it
# and to populate this modification
if len(replacedBy) == 1:
newSubject = replacedBy[0]
sesame.add((subject, settings.NS.dct.isReplacedBy, newSubject))
triples = graph.triples((None, None, subject))
try:
while True:
(s, p, o) = triples.next()
sesame.add((s, p, newSubject))
except StopIteration:
pass
# and we suppress triples that are now obsolete
sesame.remove((subject, None, None))
sesame.remove((None, None, subject))
# if subject is django object
if djRdfModel:
oldSubject = djRdfModel.objects.get(uri=unicode(subject))
oldSubject.delete()
djSubject, created = djRdfModel.objects.get_or_create(uri=unicode(newSubject))
djSubject.save() # To publish updates
elif len(deletedOn) == 1:
if djRdfModel:
djSubject, created = djRdfModel.objects.get_or_create(uri=unicode(subject))
djSubject.remove()
elif RdfModel:
subject.remove()
else:
sesame.remove((subject, None, None))
sesame.remove((None, None, subject))
else:
addtriples = []
undirect_triples = list(graph.triples((None, None, subject)))
for (s, p, o) in list(graph.triples((subject, None, None))):
# Skip triples belong to foreign "context", which correspond to
# "imported" triples in this application
# local property case
if self.is_local(p):
addtriples.append((s, p, o))
else:
if self.is_local(s):
addtriples.append((s, p, o))
elif self.is_common(s):
addtriples.append((s, p, o))
elif isinstance(o, URIRef):
if self.is_local(o):
addtriples.append((s, p, o))
else:
self.addLog("The triple (%s,%s,%s) CANNOT be added" % (s, p, o))
else:
self.addLog("The triple (%s,%s,%s) CANNOT be added" % (s, p, o))
undirect_triples = []
for (s, p, o) in list(graph.triples((None, None, subject))):
if self.is_local(p):
undirect_triples.append((s, p, o))
if self.is_local(o):
undirect_triples.append((s, p, o))
elif self.is_common(o):
undirect_triples.append((s, p, o))
elif isinstance(s, URIRef):
if self.is_local(s):
undirect_triples.append((s, p, o))
else:
self.addLog("The triple (%s,%s,%s) CANNOT be added" % (s, p, o))
else:
self.addLog("The triple (%s,%s,%s) CANNOT be added" % (s, p, o))
if djRdfModel:
djSubject, created = djRdfModel.objects.get_or_create(uri=unicode(subject))
djrdf.tools.addTriples(subject, addtriples, undirect_triples, sesame)
djSubject.save()
else:
# print "When no djRdfModel exists for %s" % subject
djrdf.tools.addTriples(subject, addtriples, undirect_triples, sesame)
for t in unknownTypes:
self.addLog("The rdf:type %s is not handled yet by the aggregator" % t)
# for the logs
self.save()
