private final Set<ApiChange> acceptedApiChanges;

    public AcceptedRegressionsRuleSetup(Map<String, Object> params) {
        AcceptedViolationsProvider acceptedApiChanges = (AcceptedViolationsProvider) params.get("acceptedApiChanges");
        if (acceptedApiChanges != null) {
            this.acceptedApiChanges = AcceptedApiChanges.fromAcceptedChangesMap(acceptedApiChanges.get()).keySet();
        } else {

    private final Map<ApiChange, String> acceptedApiChanges
    private final File mainApiChangesJsonFile
    private final File projectRootDir

    AbstractGradleViolationRule(Map<String, Object> params) {
        AcceptedViolationsProvider acceptedApiChanges = ((AcceptedViolationsProvider) params.get("acceptedApiChanges"))
        this.acceptedApiChanges = acceptedApiChanges ? AcceptedApiChanges.fromAcceptedChangesMap(acceptedApiChanges.get()) : [:]

                richReport.tap {
                    def acceptedChanges = new AcceptedViolationsProvider(acceptedViolationsDir)
                    def ruleParams = [
                        acceptedApiChanges: acceptedChanges,
                        mainApiChangesJsonFile: mainApiChangesJsonFilePath,
                        projectRootDir: projectRootDirPath
                    ]

        this.acceptedViolationsDir = acceptedViolationsDir.asFile
    }

    Map<String, String> get() {
        if (acceptedViolations == null) {
            acceptedViolations = AcceptedApiChanges.parse(
                acceptedViolationsDir.listFiles()
                    .findAll { it.name.endsWith(".json") }
                    .collect { it.text }
            ).toAcceptedChangesMap()
        }