}

    protected Violation checkSuperClassChanges(JApiClass c, CtClass oldClass, CtClass newClass) {
        Map<String, CtClass> oldInterfaces = collectImplementedInterfaces(oldClass)
        Map<String, CtClass> newInterfaces = collectImplementedInterfaces(newClass)

        newInterfaces.keySet().removeAll(oldInterfaces.keySet())

        if (newInterfaces.isEmpty()) {
            return null
        }