private Object readResolve() throws ObjectStreamException {
        Object result = null;
        if (this.equals(PieLabelLinkStyle.STANDARD)) {
            result = PieLabelLinkStyle.STANDARD;
        }
        else if (this.equals(PieLabelLinkStyle.QUAD_CURVE)) {
            result = PieLabelLinkStyle.QUAD_CURVE;
        }
        else if (this.equals(PieLabelLinkStyle.CUBIC_CURVE)) {
            result = PieLabelLinkStyle.CUBIC_CURVE;
        }
        return result;