/// <summary>
/// Returns all metadata and the stored instances as graph.
/// There are some adjustments to the data to make the metadata compatible with the Shacl validator.
/// </summary>
/// <returns></returns>
private IGraph GetShapesGraph()
{
var shapes = _cacheService.GetOrAdd($"shapes-graph", () =>
{
var store = new TripleStore();
var data = _metadataService.GetAllShaclAsGraph();
store.Add(data);
ModifiyShapesForTargetClass(store);
ModifyShapesForShaclClass(store);
var dataGraph = store.Graphs.FirstOrDefault(t => t.BaseUri?.OriginalString == data.BaseUri.OriginalString);
if (dataGraph == null)
{
throw new ArgumentNullException("Shapes graph is null");
}
NTriplesWriter writer = new NTriplesWriter(NTriplesSyntax.Original);
var shapes = VDS.RDF.Writing.StringWriter.Write(dataGraph, writer);
return(shapes);
});
var shapesGraph = new VDS.RDF.Graph(true);
var reader = new StringReader(shapes);
var nTriplesParser = new NTriplesParser();
nTriplesParser.Load(shapesGraph, reader);
return(shapesGraph);
}