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This geoLatte-geom library offers a geometry model that conforms to the OGC Simple Features for SQL specification.
There is a newer version: 1.9.1
/*
 * This file is part of the GeoLatte project.
 *
 *     GeoLatte is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     GeoLatte is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with GeoLatte.  If not, see .
 *
 * Copyright (C) 2010 - 2014 and Ownership of code is shared by:
 * Qmino bvba - Romeinsestraat 18 - 3001 Heverlee  (http://www.qmino.com)
 * Geovise bvba - Generaal Eisenhowerlei 9 - 2140 Antwerpen (http://www.geovise.com)
 */

package org.geolatte.geom;

import org.geolatte.geom.crs.CoordinateReferenceSystem;

import java.util.ArrayList;
import java.util.List;

/**
 * A Factory for {@code Geometry}s
 * 
 * 
This Factory allows generically creating Geometries
 *
 * @author Karel Maesen, Geovise BVBA
 * creation-date: 5/15/14
 */
public class Geometries {

    /**
     * Creates an empty {@code Point} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code Point}
     * @param  the type of {@code Position}
     * @return an empty {@code Point} with the specified coordinate reference system
     */
    public static 
 Point
 mkEmptyPoint(CoordinateReferenceSystem
 crs) {
        return new Point
(crs);
    }


    /**
     * Creates an empty {@code LineString} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code LineString}
     * @param 
 the type of {@code Position}
     * @return an empty {@code LineString} with the specified coordinate reference system
     */
    public static 
 LineString
 mkEmptyLineString(CoordinateReferenceSystem
 crs) {
        return new LineString
(crs);
    }


    /**
     * Creates an empty {@code Polygon} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code Polygon}
     * @param 
 the type of {@code Position}
     * @return an empty {@code Polygon} with the specified coordinate reference system
     */
    public static 
 Polygon
 mkEmptyPolygon(CoordinateReferenceSystem
 crs) {
        return new Polygon
(crs);
    }

    /**
     * Creates an empty {@code MultiPoint} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code MultiPoint}
     * @param 
 the type of {@code Position}
     * @return an empty {@code MultiPoint} with the specified coordinate reference system
     */
    public static 
 MultiPoint
 mkEmptyMultiPoint(CoordinateReferenceSystem
 crs) {
        return new MultiPoint<>(crs);
    }

    /**
     * Creates an empty {@code MultiLineString} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code MultiLineString}
     * @param 
 the type of {@code Position}
     * @return an empty {@code MultiLineString} with the specified coordinate reference system
     */
    public static 
 MultiLineString
 mkEmptyMultiLineString(CoordinateReferenceSystem
 crs) {
        return new MultiLineString<>(crs);
    }

    /**
     * Creates an empty {@code MultiPolygon} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code MultiPolygon}
     * @param 
 the type of {@code Position}
     * @return an empty {@code MultiPolygon} with the specified coordinate reference system
     */
    public static 
 MultiPolygon
 mkEmptyMultiPolygon(CoordinateReferenceSystem
 crs) {
        return new MultiPolygon<>(crs);
    }


    /**
     * Creates an empty {@code GeometryCollection} for a coordinate reference system
     *
     * @param crs the coordinate reference system for the created {@code GeometryCollection}
     * @param 
 the type of {@code Position}
     * @return an empty {@code GeometryCollection} with the specified coordinate reference system
     */
    public static 
 GeometryCollection> mkEmptyGeometryCollection(CoordinateReferenceSystem
 crs) {
        return new GeometryCollection<>(crs);
    }


    /**
     * Creates a {@code Point} from a Position and coordinate reference system
     *
     * @param pos the position for the created {@code Point}
     * @param crs the coordinate reference system for the created {@code Point}
     * @param 
 the type of {@code Position}
     * @return a {@code Point} with the specified position and coordinate reference system
     */
    public static 
 Point
 mkPoint(P pos, CoordinateReferenceSystem
 crs) {
        return new Point
(pos, crs);
    }

    /**
     * Creates a {@code LineString} from a {@code PositionSequence} and coordinate reference system
     *
     * @param seq the {@code PositionSequence} for the created {@code LineString}
     * @param crs the coordinate reference system for the created {@code LineString}
     * @param 
 the type of {@code Position}
     * @return a {@code LineString} with the specified positions and coordinate reference system
     */
    public static 
 LineString
 mkLineString(PositionSequence
 seq, CoordinateReferenceSystem
 crs) {
        return new LineString
(seq, crs);
    }

    /**
     * Creates a {@code LinearRing} from a {@code PositionSequence} and coordinate reference system
     *
     * @param seq the {@code PositionSequence} for the created {@code LinearRing}
     * @param crs the coordinate reference system for the created {@code LinearRing}
     * @param 
 the type of {@code Position}
     * @return a {@code LinearRing} with the specified positions and coordinate reference system
     */
    public static 
 LinearRing
 mkLinearRing(PositionSequence
 seq, CoordinateReferenceSystem
 crs) {
        return new LinearRing
(seq, crs);
    }

    public static 
 Polygon
 mkPolygon(LinearRing
... rings) {
        return new Polygon
(rings);
    }

    public static 
 Polygon
 mkPolygon(List> rings) {
        LinearRing
[] ringArr = (LinearRing
[]) new LinearRing[rings.size()];
        return new Polygon
(rings.toArray(ringArr));
    }

    public static 
 GeometryCollection> mkGeometryCollection(Geometry
... geometries) {
        return new GeometryCollection>(geometries);
    }

    public static 
 GeometryCollection> mkGeometryCollection(List> geometries) {
        Geometry
[] geomArr = (Geometry
[]) new Geometry[geometries.size()];
        return new GeometryCollection>(geometries.toArray(geomArr));
    }


    public static 
 MultiPoint
 mkMultiPoint(Point
... points) {
        return new MultiPoint
(points);
    }

    public static 
 MultiPoint
 mkMultiPoint(List> points) {
        Point
[] pointArr = new Point[points.size()];
        return new MultiPoint
(points.toArray(pointArr));
    }

    public static 
 MultiPoint
 mkMultiPoint(PositionSequence
 positions, CoordinateReferenceSystem
 crs) {
        final List> points = new ArrayList<>(positions.size());
        positions.forEach(p -> points.add( mkPoint(p, crs)) );
        return mkMultiPoint(points);
    }

    public static 
 MultiLineString
 mkMultiLineString(List> lineStrings) {
        LineString
[] lsArr = new LineString[lineStrings.size()];
        return new MultiLineString
(lineStrings.toArray(lsArr));
    }

    public static 
 MultiLineString
 mkMultiLineString(LineString
... linestrings) {
        return new MultiLineString
(linestrings);
    }

    public static 
 MultiPolygon
 mkMultiPolygon(Polygon
... polygons) {
        return new MultiPolygon
(polygons);
    }

    public static 
 MultiPolygon
 mkMultiPolygon(List> polygons) {
        Polygon
[] pArr = new Polygon[polygons.size()];
        return new MultiPolygon
(polygons.toArray(pArr));
    }


    @SuppressWarnings("unchecked")
    public static 
 Geometry
 mkGeometry(Class geometryClass,
                                                              PositionSequence
 positions,
                                                              CoordinateReferenceSystem
 crs) {

        if (geometryClass == null) {
            throw new IllegalArgumentException("Null argument not allowed");
        }
        if (Point.class.isAssignableFrom(geometryClass)) {
            return new Point
(positions, crs);
        }

        if (LinearRing.class.isAssignableFrom(geometryClass)) {
            return new LinearRing
(positions, crs);
        }

        if (LineString.class.isAssignableFrom(geometryClass)) {
            return new LineString
(positions, crs);
        }

        throw new IllegalStateException("Unknown Geometry class");
    }

    @SuppressWarnings("unchecked")
    public static 
 Geometry
 mkGeometry(Class geometryClass, Geometry
... parts) {
        if (Polygon.class.isAssignableFrom(geometryClass)) {
            return new Polygon((LinearRing
[]) parts);
        }
        if (MultiLineString.class.isAssignableFrom(geometryClass)) {
            return new MultiLineString
((LineString
[]) parts);
        }
        if (MultiPoint.class.isAssignableFrom(geometryClass)) {
            return new MultiPoint
((Point
[]) parts);
        }
        if (MultiPolygon.class.isAssignableFrom(geometryClass)) {
            return new MultiPolygon
((Polygon
[]) parts);
        }
        if (GeometryCollection.class.isAssignableFrom(geometryClass)) {
            return new GeometryCollection>((Geometry[]) parts);
        }
        throw new IllegalStateException("Unknown Geometry class");

    }

    public static  Geometry mkGeometry(Class geometryClass, CoordinateReferenceSystem crs) {
        if (Polygon.class.isAssignableFrom(geometryClass)) {
            return new Polygon(crs);
        }
        if (MultiLineString.class.isAssignableFrom(geometryClass)) {
            return new MultiLineString(crs);
        }
        if (MultiPoint.class.isAssignableFrom(geometryClass)) {
            return new MultiPoint(crs);
        }
        if (MultiPolygon.class.isAssignableFrom(geometryClass)) {
            return new MultiPolygon(crs);
        }
        if (GeometryCollection.class.isAssignableFrom(geometryClass)) {
            return new GeometryCollection>(crs);
        }
        throw new IllegalStateException("Unknown Geometry class");
    }

}