public static IGeometry GetShapeCopy([NotNull] IRow row)
{
if (row is IFeature)
{
var feature = (IFeature)row;
// TODO optimize
// - feature.Extent creates a copy (feature.Shape.QueryEnvelope() does not)
// - the feature may really have no geometry (shapefield was in subfields), in this case the additional get just makes it slow
if (feature.Extent.IsEmpty)
{
// this may be the case when the ShapeField was not queried (i.e. QueryFilter.SubFields = 'OID, Field')
if (row.HasOID && row.Table.HasOID)
{
feature =
GdbQueryUtils.GetFeature((IFeatureClass)row.Table, row.OID);
if (feature != null)
{
return(feature.ShapeCopy);
}
}
}
else
{
return(feature.ShapeCopy);
}
}
return(null);
}
public void CanGetNullForNonExistingFeatureFastEnough()
{
IFeatureWorkspace ws = OpenTestWorkspace();
IFeatureClass fc = ws.OpenFeatureClass("TOPGIS_TLM.TLM_STRASSE");
const int iterations = 200;
var watch = new Stopwatch();
watch.Start();
for (var iteration = 0; iteration < iterations; iteration++)
{
int oid = 999999999 + iteration;
Assert.Null(GdbQueryUtils.GetFeature(fc, oid));
}
watch.Stop();
double msPerIteration = watch.ElapsedMilliseconds / (double)iterations;
_msg.InfoFormat(@"GetFeature() per iteration: {0} ms", msPerIteration);
const int maxMilliseconds = 35;
Assert.True(msPerIteration < maxMilliseconds,
"GetFeature with non-existing feature takes too long ({0} ms)",
msPerIteration);
}
public void CanGetExistingFeaturesFastEnough()
{
IFeatureWorkspace ws = OpenTestWorkspace();
IFeatureClass fc = ws.OpenFeatureClass("TOPGIS_TLM.TLM_STRASSE");
const int count = 100;
IDictionary <int, IRow> rows = GetFirstNRows((ITable)fc, count);
var watch = new Stopwatch();
watch.Start();
foreach (int oid in rows.Keys)
{
Assert.NotNull(GdbQueryUtils.GetFeature(fc, oid));
_msg.Info($"Oid {oid} time: {watch.ElapsedMilliseconds}");
}
watch.Stop();
double msPerIteration = watch.ElapsedMilliseconds / (double)rows.Count;
_msg.InfoFormat(@"GetFeature() per iteration: {0} ms", msPerIteration);
Assert.True(msPerIteration < 50,
"GetFeature with existing feature takes too long ({0} ms)",
msPerIteration);
}
public void CanGetNullForNonExistingFeature()
{
IFeatureWorkspace ws = OpenTestWorkspace();
IFeatureClass fc = ws.OpenFeatureClass("TOPGIS_TLM.TLM_STRASSE");
Assert.Null(GdbQueryUtils.GetFeature(fc, 999999999));
}