private StatementIterator GetIterator(Entity[] subjects, Entity[] predicates, Resource[] objects, Entity[] metas, java.util.List litFilters, bool defaultGraph) {
DateTime start = DateTime.Now;
if (subjects == null && predicates == null && objects == null)
throw new QueryExecutionException("Query would select all statements in the store.");
if (subjects != null) Depersist(subjects);
if (predicates != null) Depersist(predicates);
if (objects != null) Depersist(objects);
if (metas != null) Depersist(metas);
if (subjects != null && subjects.Length == 0) return new StatementIterator(null);
if (predicates != null && predicates.Length == 0) return new StatementIterator(null);
if (objects != null && objects.Length == 0) return new StatementIterator(null);
if (metas != null && metas.Length == 0) return new StatementIterator(null);
MemoryStore results = new MemoryStore();
StatementSink sink = results;
if (!source.Distinct)
sink = new SemWeb.Util.DistinctStatementsSink(results, defaultGraph && metas == null);
SelectFilter filter = new SelectFilter(subjects, predicates, objects, metas);
if (litFilters != null) {
filter.LiteralFilters = new LiteralFilter[litFilters.size()];
for (int i = 0; i < litFilters.size(); i++)
filter.LiteralFilters[i] = (LiteralFilter)litFilters.get(i);
}
source.Select(filter, sink);
Log("SELECT: " + filter + " => " + results.StatementCount + " statements [" + (DateTime.Now-start) + "s]");
return new StatementIterator(results.ToArray());
}
public bool hasNext()
{
if (statements == null) {
System.DateTime start = System.DateTime.Now;
MemoryStore results = new MemoryStore();
StatementSink sink = results;
if (!source.Distinct)
sink = new SemWeb.Util.DistinctStatementsSink(results, !wantMetas);
source.Select(filter, sink);
wrapper.Log("SELECT: " + filter + " => " + results.StatementCount + " statements [" + (System.DateTime.Now-start) + "s]");
statements = results.ToArray();
}
return curindex + 1 < statements.Length;
}
private StatementIterator GetIterator(Entity[] subjects, Entity[] predicates, Resource[] objects, Entity[] metas, java.util.List litFilters, bool defaultGraph)
{
DateTime start = DateTime.Now;
if (subjects == null && predicates == null && objects == null)
{
throw new QueryExecutionException("Query would select all statements in the store.");
}
if (subjects != null)
{
Depersist(subjects);
}
if (predicates != null)
{
Depersist(predicates);
}
if (objects != null)
{
Depersist(objects);
}
if (metas != null)
{
Depersist(metas);
}
if (subjects != null && subjects.Length == 0)
{
return(new StatementIterator(null));
}
if (predicates != null && predicates.Length == 0)
{
return(new StatementIterator(null));
}
if (objects != null && objects.Length == 0)
{
return(new StatementIterator(null));
}
if (metas != null && metas.Length == 0)
{
return(new StatementIterator(null));
}
MemoryStore results = new MemoryStore();
StatementSink sink = results;
if (!source.Distinct)
{
sink = new SemWeb.Util.DistinctStatementsSink(results, defaultGraph && metas == null);
}
SelectFilter filter = new SelectFilter(subjects, predicates, objects, metas);
if (litFilters != null)
{
filter.LiteralFilters = new LiteralFilter[litFilters.size()];
for (int i = 0; i < litFilters.size(); i++)
{
filter.LiteralFilters[i] = (LiteralFilter)litFilters.get(i);
}
}
source.Select(filter, sink);
Log("SELECT: " + filter + " => " + results.StatementCount + " statements [" + (DateTime.Now - start) + "s]");
return(new StatementIterator(results.ToArray()));
}
