def _is_cuds_iri(self, iri):
uid = uid_from_iri(rdflib.URIRef(iri))
return (
uid in self._registry.keys()
or uid == uuid.UUID(int=0)
or iri.startswith(CUDS_IRI_PREFIX)
)
def _load_by_oclass(self, oclass):
uids = {
uid_from_iri(s)
for s, _, _ in self._triples((None, RDF.type, oclass.iri))
}
uids = {x if x != UUID(int=0) else self.root for x in uids}
yield from self._load_from_backend(uids)
def _iter(self):
"""Iterate over the over the UUIDs of the related CUDS objects.
Yields:
UUID: The UUIDs of the CUDS object related with self.rel.
"""
for o in self.graph.objects(self.cuds_object.iri, self.rel.iri):
yield uid_from_iri(o)
def __getitem__(self, variable_name):
"""Get the value of the given variable.
Handles wrapper IRIs and datatype conversion.
"""
iri = self._get(variable_name)
if (iri is not None and iri.startswith(CUDS_IRI_PREFIX)
and uid_from_iri(iri) == uuid.UUID(int=0)):
iri = iri_from_uid(self.session.root)
return self._check_datatype(variable_name, iri)
def load_from_iri(self, *iris):
"""Load the cuds_objects with the given iris.
Args:
*iri (URIRef): The IRIs of the cuds_objects to load.
Yields:
Cuds: The fetched Cuds objects.
"""
return self.load(*[uid_from_iri(iri) for iri in iris])
def create_from_triples(triples,
neighbor_triples,
session,
fix_neighbors=True):
"""Create a CUDS object from triples.
Args:
triples (List[Tuple]): The list of triples of the CUDS object to
create.
neighbor_triples (List[Tuple]): A list of important triples of
neighbors, most importantly their types.
session (Session): The session to create the CUDS object in.
fix_neighbors (bool): Whether to remove the link from the old neighbors
to this cuds object, defaults to True.
"""
from osp.core.cuds import Cuds
from osp.core.session.wrapper_session import WrapperSession
from osp.core.utils.general import uid_from_iri
triples = list(triples)
if not triples:
return None
uid = uid_from_iri(triples[0][0])
if isinstance(session, WrapperSession) and uid in session._expired:
session._expired.remove(uid)
# recycle old object
if uid in session._registry:
cuds_object = session._registry.get(uid)
cuds_object.session._notify_read(cuds_object)
if fix_neighbors:
rels = set(cuds_object._neighbors.keys())
for rel in rels:
cuds_object.remove(rel=rel)
session.graph.remove((cuds_object.iri, None, None))
for triple in set(triples):
session.graph.add(triple)
else: # create new
cuds_object = Cuds(
attributes={},
oclass=None,
session=session,
uid=uid,
extra_triples=set(triples),
)
# add the triples
for triple in set(neighbor_triples):
session.graph.add(triple)
if isinstance(session, WrapperSession):
session._store_checks(cuds_object)
cuds_object.session._notify_update(cuds_object)
return cuds_object
def import_rdf(graph, session, buffer_context, return_uid=None):
"""Import RDF Graph to CUDS.
Args:
graph (rdflib.Graph): The graph to import.
session (Session): The session to add the CUDS objects to.
buffer_context (BufferContext): add the deserialized cuds objects to
the selected buffers.
return_uid (Union[UUID, URIRef]): Return only the object with
the given uid.
Raises:
ValueError: Not allowed to deserialize with undefined buffer context.
Returns:
List[Cuds]: The deserialized CUDS objects.
"""
if not isinstance(buffer_context, BufferContext):
raise ValueError(
"Not allowed to deserialize CUDS object "
"with undefined buffer_context"
)
get_buffer_context_mngr(session, buffer_context)
triples = (triple for triple in graph if _import_rdf_filter(triple))
triples = map(_import_rdf_custom_datatypes, triples)
uid_triples = dict()
for s, p, o in triples:
s_uid = uid_from_iri(s)
session.graph.add((s, p, o))
uid_triples[s_uid] = uid_triples.get(s_uid, set())
uid_triples[s_uid].add((s, p, o))
result = list()
for uid, t in uid_triples.items():
# Create entry in the registry
x = create_from_triples(t, set(), session, fix_neighbors=False)
if return_uid is None or uid == return_uid:
result.append(x)
return result if not return_uid else result[0]
def _substitute_zero_iri(self, triples):
for triple in triples:
yield tuple(
iri_from_uid(self.root) if x is not None and x.startswith(
CUDS_IRI_PREFIX) and uid_from_iri(x) == UUID(int=0) else x
for x in triple)