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This geoLatte-geom library offers a geometry model that conforms to the OGC Simple Features for SQL specification.

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package org.geolatte.geom.generator;

import org.geolatte.geom.Geometry;
import org.geolatte.geom.Position;

import java.util.List;
import java.util.Random;

/**
 * Created by Karel Maesen, Geovise BVBA on 28/09/2018.
 */
class CombinedGeometryGenerator implements Generator> {

    private final Random  chooser;
    private final List>> generators;

    CombinedGeometryGenerator(Random rnd, List>> generators) {
        this.chooser = rnd;
        this.generators = generators;
    }

    @Override
    public Geometry generate() {
        int idx = chooser.nextInt(generators.size());
        return generators.get(idx).generate();
    }

}