I suspect the data provider has not implemented the subCollection(
filter ) method yet - can you please tell me what DataStore you are
testing with?
Here is the summary thus far ....
AbstractFeatureCollection - implemented
- ForceCoordianteSystemFeatureResults - from super
- MemoryFeatureCollection - from super
- ReprojectFeatureResults - from super
DataFeatureCollection - implemented
- DefaultFeatureResults - from super
-- JDBCFeatureCollection - from super (Please implemented this - anyone!)
--- PostgisFeatureCollection - from super
- EmptyFeatureCollection - from super
- IndexedFeatureResults - from super
DefaultFeatureCollection - implemented
- GMLFeatureCollection
FilteringFeatureCollection - unsupported
MockFeatureCollection - not implemented, expected
ReprojectingFeatureCollection - supported (best example yet)
ReTypingFeatureCollection - unsupported
SizeCappedFeatureCollection - unsupported
SubFeatureCollection - supported
- SubFeatureList - from super
AbstractFeatureList - unsupported
Jody
> Hello,
>
> I'm still a bit new to geotools. I want to extract features out of one
> Featurecollection into a new FeatureCollection. To do this, I use a bounding
> box geometry filter. This filter is build like shown in the tutorial. But
> the subcollection I get in return is empty. If I build the new
> FeatureCollection manually, it contains two features.
>
> The following code snippet shows what I'm doing:
> ...
> FeatureIterator it = fc1.features();
> FeatureIterator it2 = fc2.features();
> Feature f = null;
> Feature f2 = null;
> FeatureCollection includes = null;
>
> while(it.hasNext()){
> f = it.next();
>
> //build filter
> Envelope envelope = f.getBounds();
> //envelope = f.getDefaultGeometry().getEnvelopeInternal();
> FilterFactory ff = FilterFactoryFinder.createFilterFactory();
> Expression bbox;
> Expression geometry = ff.createAttributeExpression( "the_geom"
> );
> GeometryFilter bboxFilter;
> try {
> bbox = ff.createBBoxExpression( envelope );
> bboxFilter =
> ff.createGeometryFilter(AbstractFilter.GEOMETRY_BBOX);
> bboxFilter.addLeftGeometry( geometry );
> bboxFilter.addRightGeometry( bbox );
> } catch (IllegalFilterException e) {
> throw (RuntimeException) new RuntimeException( ).initCause(
> e );
> }
> //build new featureCollection using filter
> includes = fc2.subCollection(bboxFilter);
> //now the collection is empty
> System.out.println(includes.size());
>
> //build new featureCollection manually:
> DefaultFeatureCollections dfc = new DefaultFeatureCollections();
> includes = dfc.newCollection();
> while (it2.hasNext()) {
> f2 = it2.next();
>
> //if(f.getDefaultGeometry().intersects(f2.getDefaultGeometry())){
> if(f.getBounds().intersects(f2.getBounds())){
> includes.add(f2);
> }
> }
> it2.close();
> //now the collection contains two features
> System.out.println(includes.size());
> }
> it.close();
> ...
>
> Has someone ideas, why the results differ? Your help would be much
> appreciated!
>
> Regards,
> Kerstin Sälzer
>
>
>
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