Added Dataset.contains_named_graph()

Fixed `pyoxigraph` version at 0.3.20

example.py

@@ -26,6 +26,12 @@
 print("\ndataset.graph_names():\n")
 print(list(dataset.graph_names()))
 
+print("\ndataset.contains_named_graph(\"http://example.org/graph2\"):\n")
+print(dataset.contains_named_graph("http://example.org/graph2"))
+
+print("\ndataset.contains_named_graph(\"http://example.org/non-existing\"):\n")
+print(dataset.contains_named_graph("http://example.org/non-existing"))
+
 print("\ngraph1.list_triples():\n")
 output = io.BytesIO()
 serialize(list(graph1.list_triples()), output, "application/n-triples") # "application/n-quads" should work

oxijen/model_impl/impl.py

@@ -98,6 +98,14 @@ def graph_names(self) -> Iterator[Resource]:
 
         return map(lambda name: ResourceImpl(name, None), graph_names)
 
+    def contains_named_graph(self, name: Union[str, Resource]) -> bool:
+        if type(name) is str:
+            name_node = NamedNode(name)
+        else:
+            name_node = name.node
+
+        return self.store.contains_named_graph(name_node)
+
     def get_named_graph(self, name: Union[str, Resource]) -> Graph:
         if type(name) is str:
             name_node = NamedNode(name)

oxijen/rdf_model.py

@@ -89,6 +89,10 @@ def default_graph(self):
     def graph_names(self) -> Iterator[Resource]:
         pass
 
+    @abstractmethod
+    def contains_named_graph(self, name: Union[str, Resource]) -> bool:
+        pass
+
     @abstractmethod
     def get_named_graph(self, name: Union[str, Resource]) -> Graph:
         pass

requirements.txt

@@ -1 +1 @@
-pyoxigraph
+pyoxigraph == 0.3.20