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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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/*
 * 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 - 2011 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;

/**
 * A 0-dimensional {@code Geometry}.
 * 
 * @author Karel Maesen, Geovise BVBA, 2011
 */
public class Point extends Geometry
 implements Simple {

    public Point(CoordinateReferenceSystem
 crs) {
        super(crs);
    }

    public Point(PositionSequence
 sequence, CoordinateReferenceSystem
 crs) {
        super(sequence, crs);
        if (sequence.size() > 1) {
            throw new IllegalArgumentException("Points can only contain a single position");
        }
    }

    public Point(P position, CoordinateReferenceSystem
 crs) {
        this(new PackedPositionSequence
(
                Positions.getFactoryFor(crs.getPositionClass()), position.coords), crs);
    }

    public Point(Point
 point) {
        this(point.getPositions(), point.getCoordinateReferenceSystem());
    }

    /**
     * Returns the Position of this Point.
     *
     * @return the Position of this Point.
     */
    public P getPosition() {
        return getPositions().getPositionN(0) ;
    }

    @Override
    @SuppressWarnings("unchecked")
    public  Point as(Class castToType){
        checkCast(castToType);
        return (Point)this;
    }

    @Override
    public int getDimension() {
        return 0;
    }

    @Override
    public GeometryType getGeometryType() {
        return GeometryType.POINT;
    }

    @Override
    public void accept(GeometryVisitor visitor) {
        visitor.visit(this);
    }
}