public HashSet <Triple> HandleTriplesBeforeHashing(HashSet <Triple> triples)
{
HashSet <Triple> result = new HashSet <Triple>();
var actualIdsToInternalIds = new Dictionary <string, string>();
foreach (Triple triple in triples)
{
if (triple.Predicate.Equals(ElephantVocabulary.HasInternalLabel))
{
string actualId = triple.Subject.IsBlankNode() ? triple.Subject.AsBlankNode().Identifier : triple.Subject.AsIri().ValueAsString();
string internalId = triple.Object.AsLiteral().LexicalForm;
actualIdsToInternalIds.Add(actualId, internalId);
}
}
_logger.LogDebug("actualIdsToInternalIds={0}", actualIdsToInternalIds);
foreach (Triple triple in triples)
{
ISubject subject = triple.Subject;
IObject object_ = triple.Object;
if (triple.Predicate.Equals(ElephantVocabulary.HasInternalLabel))
{
continue;
}
if (triple.Subject.IsIri() && triple.Subject.AsIri().ValueAsString().StartsWith("urn:"))
{
subject = new BlankNode(actualIdsToInternalIds[subject.AsIri().ValueAsString()]);
result.Add(new Triple(subject, triple.Predicate, object_));
continue;
}
if (subject.IsBlankNode() || object_.IsBlankNode())
{
if (subject.IsBlankNode())
{
subject = new BlankNode(actualIdsToInternalIds[subject.AsBlankNode().Identifier]);
}
if (object_.IsBlankNode())
{
object_ = new BlankNode(actualIdsToInternalIds[object_.AsBlankNode().Identifier]);
}
result.Add(new Triple(subject, triple.Predicate, object_));
}
else
{
result.Add(triple);
}
}
return(result);
}