public static Task <SparqlResultSet> SelectQuery(this SparqlQueryable endpoint, string sparqlQuery)
{
if (endpoint.IsEndpoint())
{
return(endpoint.GetUri().AbsoluteUri.SelectQuery(sparqlQuery));
}
return(Task.Factory.StartNew(() => endpoint.GetGraph().Select(sparqlQuery)));
}
public static async Task <Dictionary <string, Dictionary <string, int> > > GetConceptDistances(SparqlQueryable endpoint, string NamedGraphUri1)
{
var namedGraph = !NamedGraphUri1.IsNullOrWhiteSpace() ? $" FROM <{NamedGraphUri1}> " : string.Empty;
var query = "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> select ?sub ?super (count(?mid) as ?distance)" + namedGraph + " WHERE { { SELECT DISTINCT ?mid WHERE { ?s rdfs:subClassOf ?mid . } } ?sub rdfs:subClassOf* ?mid . ?mid rdfs:subClassOf+ ?super . } group by ?sub ?super order by ?sub ?super";
var sparqlResultSet = await endpoint.SelectQuery(query);
var result = new Dictionary <string, Dictionary <string, int> >();
// TODO: vérifier ce résultat
// _logger.LogInformation($"# of results for concept distances : {sparqlResultSet.Count}");
foreach (var sparqlResult in sparqlResultSet)
{
if (!sparqlResult.Variables.Contains("sub") || !(sparqlResult["sub"] is UriNode))
{
continue;
}
else if (!sparqlResult.Variables.Contains("super") || !(sparqlResult["super"] is UriNode))
{
continue;
}
else if (!sparqlResult.Variables.Contains("distance"))
{
continue;
}
var sub = sparqlResult["sub"] as UriNode;
var super = sparqlResult["super"] as UriNode;
var distance = sparqlResult["distance"] as LiteralNode;
int distanceValue;
if (!int.TryParse(distance.Value, out distanceValue))
{
distanceValue = 0;
}
var subUri = sub.Uri.ToString();
var superUri = super.Uri.ToString();
Dictionary <string, int> dict;
if (result.Keys.Contains(subUri))
{
dict = result[subUri];
}
else
{
dict = new Dictionary <string, int>();
result.Add(subUri, dict);
}
if (!dict.Keys.Contains(superUri))
{
dict.Add(superUri, distanceValue);
}
}
return(result);
}