RoleStructuralData.cs

using Coscine.Database.DataModel;
using Coscine.Database.Models;
using VDS.RDF;

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)
        {
            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;
        }
    }
}