}

    Violation maybeViolation(final JApiCompatibility member) {
        if (!(member instanceof JApiClass)) {
            return null
        }

        if (!changed(member)) {
            return null
        }

        Optional<CtClass> oldClass = member.oldClass
        Optional<CtClass> newClass = member.newClass
        if (!oldClass.isPresent() || !newClass.isPresent()) {

                } else if (!oldNullability && newNullability) {
                    warnings << "Parameter $idx nullability changed from non-nullable to nullable".toString()
                }
            }
        }

        if (member instanceof JApiField) {

            JApiField field = (JApiField) member

class IncubatingInternalInterfaceAddedRule extends AbstractSuperClassChangesRule {

    IncubatingInternalInterfaceAddedRule(Map<String, Object> params) {
        super(params)
    }

    protected boolean changed(JApiCompatibility member) {
        return member.getChangeStatus() == JApiChangeStatus.MODIFIED
    }

    protected Violation checkSuperClassChanges(JApiClass c, CtClass oldClass, CtClass newClass) {

class BinaryBreakingSuperclassChangeRule extends AbstractSuperClassChangesRule {

    BinaryBreakingSuperclassChangeRule(Map<String, Object> params) {
        super(params)
    }

    @Override
    protected boolean changed(JApiCompatibility member) {
        return member instanceof JApiClass && !member.superclass.binaryCompatible && !member.superclass.compatibilityChanges.empty
    }

    @Override

class MethodsRemovedInInternalSuperClassRule extends AbstractSuperClassChangesRule {

    MethodsRemovedInInternalSuperClassRule(Map<String, Object> params) {
        super(params)
    }

    protected boolean changed(JApiCompatibility member) {
        return member.compatibilityChanges.contains(JApiCompatibilityChange.METHOD_REMOVED_IN_SUPERCLASS)
    }