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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.*;

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

import static java.util.Arrays.asList;

/**
 * Created by Karel Maesen, Geovise BVBA on 03/08/2018.
 */
public class GeometryGenerators {

    public static  Generator> combine
            (final Random rnd, final List>> generators) {
        return new CombinedGeometryGenerator<>(rnd, generators);
    }

    public static 
 Generator> combine
            (final List>> generators) {
        return new CombinedGeometryGenerator<>(new Random(), generators);
    }

    public static 
 Generator> point(Box
 bbox) {
        return new DefaultPointGenerator<>(bbox, new Random());
    }

    public static 
 Generator> point(Box
 bbox, Random rnd) {
        return new DefaultPointGenerator<>(bbox, rnd);
    }

    public static 
 Generator> lineString(int numPnts, Box
 bbox,
                                                                                      Random rnd) {
        return new DefaultLineStringGenerator<>(numPnts, bbox, rnd);
    }

    public static 
 Generator> lineString(int numPnts, Box
 bbox) {
        return new DefaultLineStringGenerator<>(numPnts, bbox, new Random());
    }

    public static 
 Generator> polygon(int numPnts, Box
 bbox,
                                                                                Random rnd) {
        return new DefaultPolygonGenerator<>(numPnts, bbox, rnd);
    }

    public static 
 Generator> polygon(int numPnts, Box
 bbox) {
        return new DefaultPolygonGenerator<>(numPnts, bbox, new Random());
    }

    public static 
 Generator> multiPoint(int numPnts, Box
 bbox,
                                                                                      Random rnd) {
        return new DefaultMultiPointGenerator<>(numPnts, bbox, rnd);
    }

    public static 
 Generator> multiPoint(int numPnts, Box
 bbox) {
        return new DefaultMultiPointGenerator<>(numPnts, bbox, new Random());
    }

    public static 
 Generator> multiLineString(int numLines,
                                                                                                int numPoints, Box
 bbox, Random rnd) {
        return new DefaultMultiLineStringGenerator<>(numLines, numPoints, bbox, rnd);
    }

    public static 
 Generator> multiLineString(int numLines,
                                                                                                int numPoints, Box
 bbox) {
        return new DefaultMultiLineStringGenerator<>(numLines, numPoints, bbox, new Random());
    }

    public static 
 Generator> multiPolygon
            (int numLines, int numPoints, Box
 bbox, Random rnd) {
        return new DefaultMultiPolygonGenerator<>(numLines, numPoints, bbox, rnd);
    }

    public static 
 Generator> multiPolygon
            (int numLines, int numPoints, Box
 bbox) {
        return new DefaultMultiPolygonGenerator<>(numLines, numPoints, bbox, new Random());
    }

    @SafeVarargs
    public static 
 Generator> geometryCollection
            (int numGeoms, Random rnd, Generator>... generators) {

        Generator> combine = combine(asList(generators));
        return new DefaultGeometryCollectionGenerator<>(numGeoms, combine, rnd);
    }

    @SafeVarargs
    public static  Generator> geometryCollection
            (int numGeoms, Generator>... generators) {
        return geometryCollection(numGeoms, new Random(), generators);
    }

}