Allows to inject pyoxigraph.Store into oxrdflib.OxigraphStore

README.md

@@ -67,6 +67,19 @@ If the `open` method is not called Oxigraph will automatically use a ramdisk on
 
 To do anything else, use the usual rdflib python API.
 
+It is also possible to directly inject a [pyoxigraph `Store` object](https://pyoxigraph.readthedocs.io/en/stable/store.html#pyoxigraph.Store) directly into an Oxrdflib store:
+
+```python
+graph = rdflib.Graph(store=oxrdflib.OxigraphStore(store=pyoxigraph.Store("test_dir")))
+```
+
+This might be handy to e.g. open the database as read-only:
+
+```python
+graph = rdflib.Graph(store=oxrdflib.OxigraphStore(store=pyoxigraph.Store.read_only("test_dir")))
+```
+
+
 ## Differences with rdflib default store
 - relative IRIs are not supported by Oxigraph.
 - Just like the `SPARQLStore`, Oxigraph joins the `initBindings` parameter of the `query` method after the query has been evaluated, instead of injecting them at the beginning of the query.

oxrdflib/__init__.py

@@ -26,8 +26,10 @@ def __init__(
         self,
         configuration: Optional[str] = None,
         identifier: Optional[Identifier] = None,
+        *,
+        store: Optional[ox.Store] = None,
     ):
-        self._store = None
+        self._store = store
         self._prefix_for_namespace: Dict[URIRef, str] = {}
         self._namespace_for_prefix: Dict[str, URIRef] = {}
         super().__init__(configuration, identifier)

tests/test_store.py

@@ -1,8 +1,11 @@
 import unittest
 from pathlib import Path
 
+from pyoxigraph import Store
 from rdflib import RDF, XSD, BNode, ConjunctiveGraph, Graph, Literal, Namespace
 
+from oxrdflib import OxigraphStore
+
 EX = Namespace("http://example.com/")
 
 
@@ -34,7 +37,13 @@ def test_store_with_late_open(self):
         with self.assertRaises(Exception) as _:
             g.open("test_store")
 
-    def _fill_graph(self, g: Graph):
+    def test_store_with_shared_backend(self):
+        store = Store()
+        self._fill_graph(Graph(store=OxigraphStore(store=store), identifier="http://example.com"))
+        self._test_graph(Graph(store=OxigraphStore(store=store), identifier="http://example.com"))
+
+    @staticmethod
+    def _fill_graph(g: Graph):
         g.add((EX.foo, RDF.type, EX.Entity))
         g.add((EX.foo, EX.prop, BNode("123")))
         g.add((EX.foo, EX.prop1, Literal("foo")))