/// <summary>
/// Updates the view by making the SPARQL Query in-memory over the relevant Triple Store.
/// </summary>
protected override void UpdateViewInternal()
{
try
{
var processor = new LeviathanQueryProcessor((IInMemoryQueryableStore)_store);
var results = processor.ProcessQuery(_q);
if (results is IGraph g)
{
// Note that we replace the existing triple collection with an entirely new one as otherwise nasty race conditions can happen
// This does mean that while the update is occurring the user may be viewing a stale graph
DetachEventHandlers(_triples);
TreeIndexedTripleCollection triples = new TreeIndexedTripleCollection();
foreach (Triple t in g.Triples)
{
triples.Add(t.CopyTriple(this));
}
_triples = triples;
AttachEventHandlers(_triples);
}
else
{
// Note that we replace the existing triple collection with an entirely new one as otherwise nasty race conditions can happen
// This does mean that while the update is occurring the user may be viewing a stale graph
DetachEventHandlers(_triples);
_triples = ((SparqlResultSet)results).ToTripleCollection(this);
AttachEventHandlers(_triples);
}
LastError = null;
RaiseGraphChanged();
}
catch (RdfQueryException queryEx)
{
LastError = new RdfQueryException("Unable to Update a SPARQL View as an error occurred in processing the Query - see Inner Exception for details", queryEx);
}
}
/// <summary>
/// Updates the view by making the query over the Native Store (i.e. the query is handled by the stores SPARQL implementation).
/// </summary>
protected override void UpdateViewInternal()
{
try
{
var results = ((INativelyQueryableStore)_store).ExecuteQuery(_q.ToString());
if (results is IGraph g)
{
DetachEventHandlers(_triples);
foreach (var t in g.Triples)
{
_triples.Add(t.CopyTriple(this));
}
AttachEventHandlers(_triples);
}
else
{
DetachEventHandlers(_triples);
_triples = ((SparqlResultSet)results).ToTripleCollection(this);
AttachEventHandlers(_triples);
}
LastError = null;
RaiseGraphChanged();
}
catch (RdfQueryException queryEx)
{
LastError = new RdfQueryException("Unable to Update a SPARQL View as an error occurred in processing the Query - see Inner Exception for details", queryEx);
}
}
