public static IEnumerable <Triple> GetContextualGraph(this SparqlRemoteEndpoint endpoint, UriNode uriNode, HashSet <UriNode> processed, int rank)
{
if (rank == 0)
{
return(new List <Triple>());
}
rank--;
var triples = endpoint.GetTriples(uriNode).ToList();
var triplesToAdd = new List <Triple>();
foreach (var triple in triples)
{
var subject = triple.Subject.NodeType == NodeType.Uri ? (UriNode)triple.Subject : null;
if (!processed.Contains(subject))
{
processed.Add(subject);
triplesToAdd.AddRange(GetContextualGraph(endpoint, subject, processed, rank));
}
var obj = triple.Object.NodeType == NodeType.Uri ? (UriNode)triple.Object : null;
if (obj != null && !processed.Contains(obj))
{
processed.Add(obj);
triplesToAdd.AddRange(GetContextualGraph(endpoint, obj, processed, rank));
}
}
triples.AddRange(triplesToAdd);
return(triples.Distinct());
}
public static IEnumerable <Triple> GetContextualGraph(this SparqlRemoteEndpoint endpoint, Uri uri, HashSet <string> processed, int rank)
{
if (rank == 0 || processed.Contains(uri.ToString()))
{
return(new List <Triple>());
}
rank--;
var triples = endpoint.GetTriples(uri).ToList();
if (rank > 0)
{
var triplesToAdd = new List <Triple>();
foreach (var triple in triples)
{
var subject = (UriNode)triple.Subject;
if (!processed.Contains(subject.Uri.ToString()))
{
processed.Add(subject.Uri.ToString());
triplesToAdd.AddRange(GetContextualGraph(endpoint, subject.Uri, processed, rank));
}
var obj = triple.Object.NodeType == NodeType.Uri ? (UriNode)triple.Object : null;
if (obj != null && !processed.Contains(obj.Uri.ToString()))
{
processed.Add(obj.Uri.ToString());
triplesToAdd.AddRange(GetContextualGraph(endpoint, obj.Uri, processed, rank));
}
}
triples.AddRange(triplesToAdd);
}
// else
// {
// triples.Select(t => processed.Add(t.Subject.ToString())).ToList();
// triples.Where(t => t.Object.NodeType == NodeType.Uri).Select(t => processed.Add(t.Object.ToString())).ToList();
// }
return(triples);
}
