/// <summary>
/// Get all the predicates from the triples with given subject IRI, sorted according to the popularity of predicates
/// </summary>
public static async Task RetrievePredicatesAndObjectCounts(PredicateResultWrapperList list, string subjectIri, string language, SparqlRemoteEndpoint endpoint)
{
Config.AssertAbsoluteUri(subjectIri);
SparqlQuery query = QueryCreating.CreateQuery(QueryTemplates.SelectDistinctPredicateAndObjectCount, subjectIri, language);
var holder = await RetrieveResultHolder(query, endpoint);
foreach (var result in holder.QueryResultSet)
{
var predicate = await CreatePredicateNodeFromSparqlResult(subjectIri, holder.QueryEndpoint, result);
list.InsertPredicateWrapper(predicate);
}
list.Sort();
}
/// <summary>
/// Get all the predicates from the triples with given subject IRI from multiple endpoints, sorted according to the popularity of predicates
/// </summary>
public static async Task RetrievePredicatesAndObjectCounts(PredicateResultWrapperList list, string subjectIri, string language, List <SparqlRemoteEndpoint> endpoints)
{
Config.AssertAbsoluteUri(subjectIri);
SparqlQuery query = QueryCreating.CreateQuery(QueryTemplates.SelectDistinctPredicateAndObjectCount, subjectIri, language);
/*** create tasks ***/
List <Task <ResultHolder> > tasks = new List <Task <ResultHolder> >(capacity: endpoints.Count);
try
{
foreach (var endpoint in endpoints)
{
tasks.Add(RetrieveResultHolder(query, endpoint));
}
}
catch (Exception)
{
throw;
}
/*** process results ***/
try
{
foreach (var task in tasks)
{
var endpoint = task.Result.QueryEndpoint;
foreach (var result in task.Result.QueryResultSet)
{
var predicate = await CreatePredicateNodeFromSparqlResult(subjectIri, endpoint, result);
list.InsertPredicateWrapper(predicate);
}
}
}
catch (AggregateException)
{
throw;
}
catch (Exception)
{
throw;
}
list.Sort();
//TODO: handle duplicates
}
