Hi all,
Im attempting to run a program that dynamically adds and modifies
features in a shapefile, where I decide on which features get modified
through a spatial index query with a Quadtree.
When testing the code, if I:
(1) create a new feature,
fStore.addFeatures(DataUtilities.collection( newFeature ));
spatialIndex.insert( bounds, newFeature );
(2) query that features location (spatialIndex.query(
)) to get the
feature, and then
(3) try to remove that feature in the same instance (through
featureStore.removeFeatures()),
It creates the feature fine, but doesnt remove it. However, if I run two
separate instances of my class where I create the feature in the first,
and then remove it in the second, it works fine. E.g.,
MyFeatureClass mfc = new MyFeatureClass ();
mfc.createFeature();
MyFeatureClass mfc2 = new MyFeatureClass ();
mfc2.modifyFeature();
Checking into this further, I noticed that this only happens in my code
when I use the Quadtree spatial index to query my features. E.g., if I
query my spatial index based on the coordinate of where I created my new
feature,
Point location = geofactory.createPoint(coord);
List<SimpleFeature> hits =
spatialIndex.query(location.getEnvelopeInternal());
SimpleFeature feature;
for (int i = 0; i < hits.size(); i++) {
feature= hits.get(i);
Geometry geom = (Geometry)
feature.getAttribute(schema.getGeometryDescriptor().getLocalName());
if (newGeometry.intersects(geom)) {
fCollection.add(feature);
}
}
Set<FeatureId> removeFeatureSet = new HashSet<FeatureId>();
FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2( null );
iterator = fCollection.features();
while( iterator.hasNext()){
SimpleFeature feature = iterator.next();
removeFeatureSet.add( ff.featureId(feature.getID()));
spatialIndex.remove( bounds, feature );
}
removeFilter = ff.id( removeFeatureSet);
fStore.removeFeatures(removeFilter);
Alternatively, if I query my to-remove features straight from the feature
source instead of getting them from the spatial index, it works fine.
E.g.,
Filter filter= ff.intersects(ff.property(geometryPropertyName),
ff.literal(newGeometry));
fCollection = fSource.getFeatures( filter );
(as above)
removeFeatures(removeFilter);
I would like to use a Spatial Index for querying because Ill be doing a
lot of location-based queries for features on a large dataset, but I also
need to modify the shapefile frequently. Can the JTS Quadtree be used to
query and return features that will then get modified in the same
instance? Or do I need to get features straight from the feature source
insead of the spatial index when modifying? If anyone has any suggestions
I would greatly appreciate it. I can send the full code if anyone would
like to see.
Thanks,
Wade
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