From 7be51308485aff8851ac8a9a09e45abb309245b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martynas=20Jusevi=C4=8Dius?= <martynas@atomgraph.com>
Date: Sat, 4 Nov 2023 12:10:48 +0100
Subject: [PATCH] Added `Dataset.contains_named_graph()`

Fixed `pyoxigraph` version at 0.3.20
---
 example.py                | 6 ++++++
 oxijen/model_impl/impl.py | 8 ++++++++
 oxijen/rdf_model.py       | 4 ++++
 requirements.txt          | 2 +-
 4 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/example.py b/example.py
index 046dd18..a96f800 100644
--- a/example.py
+++ b/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
diff --git a/oxijen/model_impl/impl.py b/oxijen/model_impl/impl.py
index 0cb1e36..6503353 100644
--- a/oxijen/model_impl/impl.py
+++ b/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)
diff --git a/oxijen/rdf_model.py b/oxijen/rdf_model.py
index d39daed..eea2b7c 100644
--- a/oxijen/rdf_model.py
+++ b/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
diff --git a/requirements.txt b/requirements.txt
index 1e86459..e81f3c7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-pyoxigraph
\ No newline at end of file
+pyoxigraph == 0.3.20
\ No newline at end of file