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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.crs;

import org.geolatte.geom.C2D;
import org.geolatte.geom.Linear;

import java.util.Arrays;
import java.util.List;

/**
 * A Cartesian 2-Dimensional coordinate system.
 *
 * A Cartesian coordinate system is a
 * coordinate system which gives the position of points relative to orthogonal straight axes. All axes shall have the same unit of measure.
 * 
 *
 * Created by Karel Maesen, Geovise BVBA on 28/11/14.
 */
public class CartesianCoordinateSystem2D extends CoordinateSystem {

    private final static List REQUIRED_AXIS_NORMAL_ORDER = Arrays.asList(0, 1);

    public final static CartesianCoordinateSystem2D DEFAULT = new CartesianCoordinateSystem2D(
            new StraightLineAxis("X", CoordinateSystemAxisDirection.EAST, LinearUnit.METER),
            new StraightLineAxis("Y", CoordinateSystemAxisDirection.NORTH, LinearUnit.METER));



    /**
     * Constructs an instance
     *
     * @param first  the first axis
     * @param second the second axis
     */
    public CartesianCoordinateSystem2D(StraightLineAxis first, StraightLineAxis second) {
        super(first, second);
        checkAxes();
    }

    private void checkAxes() {
        List order = getAxisNormalOrder();
        if (!order.containsAll(REQUIRED_AXIS_NORMAL_ORDER)) {
            throw new IllegalArgumentException("Require order 0 and 1 axes");
        }
    }


    @Override
    public Class getPositionClass() {
        return C2D.class;
    }

    @Override
    public CoordinateSystem merge(OneDimensionCoordinateSystem coordinateSystem) {
        CoordinateSystemAxis axis = coordinateSystem.getAxis();
        return extend(axis);
    }

    @Override
    public CoordinateSystem extend(CoordinateSystemAxis axis) {
        if (axis instanceof VerticalStraightLineAxis) {
            return new CartesianCoordinateSystem3D((StraightLineAxis) getAxis(0), (StraightLineAxis) getAxis(1), (VerticalStraightLineAxis) axis);
        }
        if (axis instanceof MeasureStraightLineAxis) {
            return new CartesianCoordinateSystem2DM((StraightLineAxis) getAxis(0), (StraightLineAxis) getAxis(1), (MeasureStraightLineAxis) axis);
        }
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean hasZ() {
        return false;
    }

    @Override
    public boolean hasM() {
        return false;
    }
}