Reviewing the methods with Devon a lot of it looked pretty straight forward
using FeatureSource and visitor.
featureSource.stream().forEach(
f -> System.out.println( f.getId() ) );
);
Once concern I had, well Kevin had, was how to handle predicates cleanly.
There is an overlap of functionality between Predicates and our Filter
interface - it would be great Filter could implement Predicate (allowing
them to be used for java streams) and allowing us to detect the use of:
Filter predicate = CQL.toFilter("attName >= 5");
boolean found = featureSource.stream().anyMatch( predicate );
featureSource.stream().filter( predicate ).forEach(
f -> System.out.println( f.getId() ) );
);
Collection<Geometry> geoms = featureSource.stream().map(
f -> (Geometry) f.getDefaultGeometry();
).collect( Collectors.toList() );
--
Jody Garnett
On 5 August 2016 at 14:45, Devon Tucker <devonrtuc...@gmail.com> wrote:
> Hi all,
>
> Jody and I were talking today about and idea he has been agitating for a
> while. We'd like to basically implement the Java 8 streaming interface for
> features on top of FeatureSource or FeatureCollection. Just throwing this
> out there for early feedback to see what people think.
>
> Jody thinks that much of that API can be implemented in terms of the
> existing functionality fairly simply/efficiently while others can be
> delegated to simpler Stream objects (created from builder utilities).
>
> Interested in what people think. We'll probably do a quick proposal
> shortly.
>
> Cheers,
> Devon
>
>
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>
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> GeoTools-Devel@lists.sourceforge.net
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>
>
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