public final class LengthConstraintType implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -1156658804028142978L;
    
    /** NONE. */
    public static final LengthConstraintType NONE 
        = new LengthConstraintType("LengthConstraintType.NONE");

    /** Range. */
    public static final LengthConstraintType RANGE 
        = new LengthConstraintType("RectangleConstraintType.RANGE");

    /** FIXED. */
    public static final LengthConstraintType FIXED 
        = new LengthConstraintType("LengthConstraintType.FIXED");

    /** The name. */
    private String name;

    /**
     * Private constructor.
     *
     * @param name  the name.
     */
    private LengthConstraintType(String name) {
        this.name = name;
    }

    /**
     * Returns a string representing the object.
     *
     * @return The string.
     */
    public String toString() {
        return this.name;
    }

    /**
     * Returns <code>true</code> if this object is equal to the specified 
     * object, and <code>false</code> otherwise.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof LengthConstraintType)) {
            return false;
        }
        LengthConstraintType that = (LengthConstraintType) obj;
        if (!this.name.equals(that.toString())) {
            return false;
        }
        return true;
    }
    
    /**
     * Returns a hash code value for the object.
     *
     * @return The hashcode
     */
    public int hashCode() {
        return this.name.hashCode();
    }

    /**
     * Ensures that serialization returns the unique instances.
     * 
     * @return The object.
     * 
     * @throws ObjectStreamException if there is a problem.
     */
    private Object readResolve() throws ObjectStreamException {
        if (this.equals(LengthConstraintType.NONE)) {
            return LengthConstraintType.NONE;
        }
        else if (this.equals(LengthConstraintType.RANGE)) {
            return LengthConstraintType.RANGE;
        }
        else if (this.equals(LengthConstraintType.FIXED)) {
            return LengthConstraintType.FIXED;
        }
        return null;