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UserStructuralData.cs 1.89 KiB
using Coscine.Database.DataModel;
using Coscine.Database.Models;
using Coscine.Metadata;
using VDS.RDF;
namespace SQL2Linked.Implementations
{
public class UserStructuralData : StructuralData<User, UserModel>
{
public readonly string UserUrlPrefix = "https://purl.org/coscine/users";
public readonly Uri rdf = new("http://www.w3.org/1999/02/22-rdf-syntax-ns#");
public readonly Uri foaf = new("http://xmlns.com/foaf/0.1/");
public override IEnumerable<IGraph> ConvertToLinkedData(IEnumerable<User> entries)
{
var graphs = new List<IGraph>();
foreach (var entry in entries)
{
var userGraphName = $"{UserUrlPrefix}/{entry.Id}";
var graph = RdfStoreConnector.GetGraph(userGraphName);
// check if a triple with a foaf:Person already exists in the user graph
var getTriples = graph.GetTriplesWithObject(new Uri(foaf + "Person"));
// check if the current display name is already applied in the user graph
var getTriplesName = graph.GetTriplesWithPredicate(new Uri(foaf + "name"));
if (!getTriples.Any() || !getTriplesName.Any((triple) => triple.Object.ToString() == entry.DisplayName))
{
AssertToGraphUriNode(graph, userGraphName, rdf + "type", foaf + "Person");
graph.Retract(getTriplesName);
AssertToGraphLiteralNode(graph, userGraphName, foaf + "name", entry.DisplayName);
graphs.Add(graph);
Console.WriteLine($"Will migrate user '{entry.DisplayName}' with id '{entry.Id}'.");
}
else
{
Console.WriteLine($"Will NOT migrate user '{entry.DisplayName}' with id '{entry.Id}'.");
}
}
return graphs;
}
}
}