/// <summary>
/// Retrieve objects of the given predicate; number of objects is already set in the template query
/// </summary>
private static async Task RetrieveObjectsOfPredicate(PredicateResultWrapper predicate, SparqlParameterizedString template)
{
var queryText = new SparqlParameterizedString(template.ToString());
queryText.SetPredicate(predicate.ToString());
var query = QueryParsing.ParseQuery(queryText);
var results = await QueryProcessing.ProcessQuery(query, predicate.Endpoint);
if (results is SparqlResultSet)
{
SparqlResultSet set = (SparqlResultSet)results;
foreach (var obj in set)
{
predicate.AddObject(new ObjectWrapper(obj[0], predicate.Endpoint));
}
}
else if (results is AsyncError)
{
throw new BrowserException(ErrorProcessing.ProcessAsyncError((AsyncError)results));
}
else
{
throw new BrowserException("An unexpected error occured while processing the query.");
}
//template.UnsetPredicate(); //no more reusing
}
/// <summary>
/// Get the SparqlResultSet together with the endpoint it came from
/// </summary>
private static async Task <ResultHolder> RetrieveResultHolder(SparqlQuery query, SparqlRemoteEndpoint endpoint)
{
object results = await QueryProcessing.ProcessQuery(query, endpoint);
if (results is SparqlResultSet)
{
SparqlResultSet set = (SparqlResultSet)results;
return(new ResultHolder(endpoint, set));
}
else if (results is AsyncError)
{
throw new BrowserException(ErrorProcessing.ProcessAsyncError((AsyncError)results));
}
else
{
throw new BrowserException("An unexpected error occured while processing the query.");
}
}