filter-ast based get interface in graph.

* Graph interface: Graph.get added
* Node instance resolver so that Nodes can be used in a filter ast
* AC interface: filter_read added to interface
* upstream test adjustments of previous sparql store changes

1 files changed, 5 insertions, 0 deletions

diff --git a/bsfs/graph/ac/null.py b/bsfs/graph/ac/null.py
index 36838bd..12b4e87 100644
--- a/bsfs/graph/ac/null.py
+++ b/bsfs/graph/ac/null.py
@@ -10,6 +10,7 @@ import typing
 # bsfs imports
 from bsfs import schema
 from bsfs.namespace import ns
+from bsfs.query import ast
 from bsfs.utils import URI
 
 # inner-module imports
@@ -49,4 +50,8 @@ class NullAC(base.AccessControlBase):
         """Return nodes that are allowed to be created."""
         return guids
 
+    def filter_read(self, node_type: schema.Node, query: ast.filter.FilterExpression) -> ast.filter.FilterExpression:
+        """Re-write a filter *query* to get (i.e., read) *node_type* nodes."""
+        return query
+
 ## EOF ##