New: MigrateSQL2Linked to GD

coscine/issues#2915

src/GraphDeployer/Implementations/PatchGraph.cs

+using VDS.RDF;
+
+namespace Coscine.GraphDeployer;
+
+/// <summary>
+/// Represents a specialized RDF graph for small-scale updates.
+/// This class extends the standard Graph class with additional
+/// functionalities for tracking changes (assertions and retractions).
+/// </summary>
+/// <remarks><i>TODO: Consider extending <see cref="ITransactionalGraph"/> to allow for rollback and commit operations.</i></remarks>
+public class PatchGraph : Graph
+{
+    public List<Triple> AssertList { get; set; } = new();
+
+    public List<Triple> RetractList { get; set; } = new();
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="PatchGraph"/> class.
+    /// </summary>
+    public PatchGraph() : base()
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="PatchGraph"/> class.
+    /// </summary>
+    public PatchGraph(Uri graphUri) : base(graphUri)
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="IPatchGraph"/> class with the specified graph URI.
+    /// </summary>
+    /// <param name="graphUri">The base URI for the graph.</param>
+    /// <returns>A new empty instance of <see cref="IPatchGraph"/> with the provided base URI.</returns>
+    public static PatchGraph Empty(Uri graphUri)
+    {
+        return new PatchGraph(graphUri)
+        {
+            BaseUri = graphUri
+        };
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="IPatchGraph"/> class with the specified graph URI.
+    /// </summary>
+    /// <param name="graphUri">The base URI for the graph as a string.</param>
+    /// <returns>A new empty instance of <see cref="IPatchGraph"/> with the provided base URI.</returns>
+    public static PatchGraph Empty(string graphUri)
+    {
+        return Empty(new Uri(graphUri));
+    }
+
+    public override bool Assert(Triple t)
+    {
+        AssertList.Add(t);
+        return base.Assert(t);
+    }
+
+    public override bool Assert(IEnumerable<Triple> triples)
+    {
+        AssertList.AddRange(triples);
+        return base.Assert(triples);
+    }
+
+    public override bool Retract(Triple t)
+    {
+        RetractList.Add(t);
+        return base.Retract(t);
+    }
+
+    public override bool Retract(IEnumerable<Triple> triples)
+    {
+        RetractList.AddRange(triples);
+        return base.Retract(triples);
+    }
+}