Fix: Migrate role structured data to linked data

src/SQL2Linked/Implementations/RoleStructuralData.cs

@@ -6,10 +6,65 @@ namespace SQL2Linked.Implementations
 {
     public class RoleStructuralData : StructuralData<Role, RoleModel>
     {
+        public readonly string RoleUrlPrefix = "https://purl.org/coscine/roles";
+        public readonly Uri RdfType = new("http://www.w3.org/1999/02/22-rdf-syntax-ns#type");
+        public readonly Uri orgRole = new("http://www.w3.org/ns/org#Role");
+        public readonly Uri dctermsTitle = new("http://purl.org/dc/terms/title");
+
         public override IEnumerable<IGraph> ConvertToLinkedData(IEnumerable<Role> entries)
         {
-            // ToDo: Implement
-            throw new NotImplementedException();
+            var graphs = new List<IGraph>();
+
+            foreach (var entry in entries)
+            {
+                var roleGraphName = $"{RoleUrlPrefix}/{entry.Id}";
+                var graph = RdfStoreConnector.GetGraph(roleGraphName);
+
+                // check if a triple with a org:role already exists in the role graph
+                var getTriplesOrgRole = graph.GetTriplesWithObject(orgRole);
+
+                if (!getTriplesOrgRole.Any())
+                {
+                    graph.Assert(
+                        new Triple(
+                            graph.CreateUriNode(new Uri(roleGraphName)),
+                            graph.CreateUriNode(RdfType),
+                            graph.CreateUriNode(orgRole)
+                        )
+                    );
+
+                    Console.WriteLine($"For role '{entry.DisplayName}' will migrate triple '{graph.BaseUri}' a org:Role. ");
+                }
+                else
+                {
+                    Console.WriteLine($"For role '{entry.DisplayName}' will NOT migrate triple '{graph.BaseUri}' a org:Role. ");
+                }
+
+                // check if a triple with dcterms:title '{entry.DisplayName}' already exists in the role graph
+                var getTriplesDctermsTitle = graph.GetTriplesWithPredicate(dctermsTitle);
+
+                if (!getTriplesDctermsTitle.Any())
+                {
+                    graph.Assert(
+                        new Triple(
+                            graph.CreateUriNode(new Uri(roleGraphName)),
+                            graph.CreateUriNode(dctermsTitle),
+                            graph.CreateLiteralNode(entry.DisplayName)
+                        )
+                    );
+
+                    Console.WriteLine($"For role '{entry.DisplayName}' will migrate triple '{graph.BaseUri}' dcterms:title '{entry.DisplayName}'. ");
+                }
+                else
+                {
+                    Console.WriteLine($"For role '{entry.DisplayName}' will NOT migrate triple '{graph.BaseUri}' dcterms:title '{entry.DisplayName}'. ");
+                }
+                if (!getTriplesOrgRole.Any() || !getTriplesDctermsTitle.Any())
+                {
+                    graphs.Add(graph);
+                }
+            }
+            return graphs;
         }
     }
 }
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