2009/10/4 dadar wrote:
>
> Michael, I have some trouble understanding the source
You are really diving in at the deep end ! GeoTools is a very big
library and many of the concepts and usages will be new to you. I
think you need to take it slowly and study the examples and the
related pages in the GeoTools wiki.
> filter = ff.contains(ff.property(geometryAttributeName), ff.literal(point));
> what is ff in the code above??
An instance of FilterFactory2. You will find it defined at the top of
the class...
/*
* Factories that we will use to create style and filter objects
*/
private StyleFactory sf = CommonFactoryFinder.getStyleFactory(null);
private FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(null);
private GeometryFactory geomFactory =
JTSFactoryFinder.getGeometryFactory(null);
> and can you explain to me what is this code for
> FeatureCollection<SimpleFeatureType, SimpleFeature> selectedFeatures =
> featureSource.getFeatures(filter);
>
> FeatureIterator<SimpleFeature> iter =
> selectedFeatures.features();
> Set<FeatureId> IDs = new HashSet<FeatureId>();
>
Have a look at these related pages in the user guide for more background:
http://docs.codehaus.org/display/GEOTDOC/02+Filter
http://docs.codehaus.org/display/GEOTDOC/Filter+Examples
http://docs.codehaus.org/display/GEOTDOC/06+FeatureSource
Hope this helps.
Michael
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