diff options
Diffstat (limited to 'bsfs/graph/graph.py')
| -rw-r--r-- | bsfs/graph/graph.py | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/bsfs/graph/graph.py b/bsfs/graph/graph.py index b7b9f1c..f030fed 100644 --- a/bsfs/graph/graph.py +++ b/bsfs/graph/graph.py @@ -9,12 +9,15 @@ import os import typing # bsfs imports +from bsfs.query import ast, validate from bsfs.schema import Schema from bsfs.triple_store import TripleStoreBase from bsfs.utils import URI, typename # inner-module imports +from . import ac from . import nodes as _nodes +from . import resolve # exports __all__: typing.Sequence[str] = ( @@ -43,6 +46,9 @@ class Graph(): def __init__(self, backend: TripleStoreBase, user: URI): self._backend = backend self._user = user + self._resolver = resolve.Filter(self._backend.schema) + self._validate = validate.Filter(self._backend.schema) + self._ac = ac.NullAC(self._backend, self._user) # ensure Graph schema requirements self.migrate(self._backend.schema) @@ -84,6 +90,9 @@ class Graph(): # migrate schema in backend # FIXME: consult access controls! self._backend.schema = schema + # re-initialize members + self._resolver.schema = self.schema + self._validate.schema = self.schema # return self return self @@ -107,7 +116,21 @@ class Graph(): *node_type*) once some data is assigned to them. """ + return self.nodes(node_type, {guid}) + + def get(self, node_type: URI, query: ast.filter.FilterExpression) -> _nodes.Nodes: # FIXME: How about empty query? + """Return a `Nodes` instance over all nodes of type *node_type* that match the *subject* query.""" + # get node type type_ = self.schema.node(node_type) - return _nodes.Nodes(self._backend, self._user, type_, {guid}) + # resolve Nodes instances + query = self._resolver(type_, query) + # add access controls to query + query = self._ac.filter_read(type_, query) + # validate query + self._validate(type_, query) + # query the backend + guids = self._backend.get(type_, query) # no need to materialize + # return Nodes instance + return _nodes.Nodes(self._backend, self._user, type_, guids) ## EOF ## |