yeah, most of the time you are safe using
SimpleFeature/SimpleFeatureType. The generic Feature is capable of
modelling complex data, joins, relationships, etc... So if your
requirements are simple and your data flat just use SimpleFeature.
You can still use regular Feature, but you will have to explicitly cast
to a JTS geometry.
-Justin
Alessandro Ferrucci wrote:
> Ok, reading through the postGIS module test cases for GeoTools 2.5.5 I
> figured it out.
>
> One way to do it is to use SimpleFeatures and then extract the Geometry
> through that. Just out of curiousity is there a way to do this using
> "Feature" objects instead of SimpleFeature objects?
>
> Here's the relevant code that works:
>
> org.opengis.filter.Filter filter = null;
> FeatureReader<SimpleFeatureType,SimpleFeature> featureReader = null;
> Transaction transaction = null;
> try
> {
> String[] columns = new String[]
> {
> "the_geom", "mtfcc",
> "fullname"
> };
> filter = CQL.toFilter("mtfcc='S1100' and fullname like 'I%-%'");
> DefaultQuery q = new DefaultQuery("roads", filter, columns);
> transaction = new DefaultTransaction();
> featureReader = ds.getFeatureReader(q, transaction);
> while (featureReader.hasNext())
> {
> SimpleFeature f = featureReader.next();
> Integer interstateNumber = getInterstateNumber((String)
> f.getProperty("fullname").getValue());
> List<Geometry> geomList =
> s1100InterstateGeometry.get(interstateNumber + "");
> if (geomList == null)
> {
> geomList = new ArrayList<Geometry>();
> }
> Geometry geom = (Geometry)f.getDefaultGeometry();
> System.out.println("the_geom: " + geom);
> }
> featureReader.close();
> }
> catch (CQLException ex)
> {
> ex.printStackTrace();
> }
> catch (IOException ex)
> {
> ex.printStackTrace();
> }
> finally
> {
> if (featureReader != null)
> {
> try
> {
> featureReader.close();
> }
> catch (IOException ex)
> {
> ex.printStackTrace();
> }
> }
> if (transaction != null)
> {
> try
> {
> transaction.close();
> }
> catch (IOException ex)
> {
> ex.printStackTrace();
> }
> }
> }
>
>
>
> On Thu, Jun 11, 2009 at 3:14 PM, Alessandro Ferrucci
> <alessandroferru...@gmail.com <mailto:alessandroferru...@gmail.com>> wrote:
>
> Ok I was able to extract a GeometryAttribute from the feature's
> properties collection, but I need to get a JTS Geometry since I will
> need to do a LineMerger operation on the Geometries.
>
> How can I do that?
>
> thanks
>
> alessandro ferrucci
>
>
>
> On Thu, Jun 11, 2009 at 3:02 PM, Alessandro Ferrucci
> <alessandroferru...@gmail.com <mailto:alessandroferru...@gmail.com>>
> wrote:
>
> hello,
>
> in previous releases of geotools I could use FeatureReader from
> a postgis DataSource and extract Features and get the default
> geometry from those feature objects.
>
> Now the FeatureReader uses the opengis Feature and I have no
> clue how I can extract Geometries from those features..anyone
> have any examples on how I can do this in geotools 2.5.5 ?
>
> Here's the relevant code:
>
>
> org.opengis.filter.Filter filter = null;
> FeatureReader fr = null;
> Transaction transaction = null;
> String[] columns = new String[]
> {
> "the_geom", "mtfcc",
> "fullname"
> };
> filter = CQL.toFilter("mtfcc='S1100' and fullname
> like 'I%-%'");
> DefaultQuery q = new DefaultQuery("roads", filter,
> columns);
> transaction = new DefaultTransaction();
> fr = ds.getFeatureReader(q, transaction);
> while (fr.hasNext())
> {
> Feature f = fr.next();
> //HOW TO GET A GEOMETRY OUT OF THIS FEATURE???
> No more methods "getDefaultGeometry()"
> }
> fr.close();
> .....
>
>
> Thanks
>
> Alessandro Ferrucci
> --
> Signed,
> Alessandro Ferrucci
>
>
>
>
> --
> Signed,
> Alessandro Ferrucci
>
>
>
>
> --
> Signed,
> Alessandro Ferrucci
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
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>
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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