/** * {@inheritDoc} */ @Override public int hashCode() { final int prime = 31; int result = 1; result = (prime * result) + ((referenceType == null) ? 0 : referenceType.hashCode()); result = (prime * result) + ((from == null) ? 0 : from.hashCode()); result = (prime * result) + ((to == null) ? 0 : to.hashCode()); return result; }