HorizontalCS.java

package org.geotiff.epsg;

/**
 * Represents the base class of the EPSG horizontal coordinate systems. It is
 * also contains the factory method for constructing these things.
 * 
 * @author: Niles D. Ritter
 */

public abstract class HorizontalCS {

    // registered EPGS codes
    public static int WGS84 = 4326;

    private int code;

    protected HorizontalCS(int code) {
        setCode(code);
    }

    protected void setCode(int aCode) {
        code = aCode;
    }

    public int getCode() {
        return code;
    }

    /**
     * This method must be implemented by the extendend class to return the
     * undelying geographic coordinate system.
     */
    public abstract HorizontalCS getGeographicCS();

    /**
     * Factory method for coordinate systems.
     */
    public static HorizontalCS create(int code) throws InvalidCodeException {
        if (code < 0)
            throw new InvalidCodeException("whatever");

        if (code < 5000)
            return new GeographicCS(code);
        else
            return new ProjectedCS(code);
    }
}