if (inactiveProfileIds == null) {
            inactiveProfileIds = new ArrayList<>();
        }

        return inactiveProfileIds;
    }

    @Override
    public DefaultModelBuildingRequest setInactiveProfileIds(List<String> inactiveProfileIds) {
        if (inactiveProfileIds != null) {
            this.inactiveProfileIds = new ArrayList<>(inactiveProfileIds);
        } else {

        this.inactiveProfileIds = unmodifiable(inactiveProfileIds);
        return this;
    }

    @Override
    public Map<String, String> getSystemProperties() {
        return systemProperties;
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected

     * @param inactiveProfileIds A {@link List} of profile IDs that must be deactivated.
     * @deprecated Use {@link #deactivateOptionalProfile(String)} or {@link #deactivateRequiredProfile(String)} instead.
     */
    @Deprecated
    public void overwriteInactiveProfiles(List<String> inactiveProfileIds) {
        getInactiveProfiles().forEach(this.activations::remove);

        return request.getInactiveProfileIds();
    }

    @Override
    public FilterModelBuildingRequest setInactiveProfileIds(List<String> inactiveProfileIds) {
        request.setInactiveProfileIds(inactiveProfileIds);

        return this;
    }

    @Override
    public Properties getSystemProperties() {
        return request.getSystemProperties();
    }

    @Override

     * Sets the identifiers of those profiles that should be deactivated by explicit demand.
     *
     * @param inactiveProfileIds The identifiers of those profiles to deactivate, may be {@code null}.
     * @return This request, never {@code null}.
     */
    ModelBuildingRequest setInactiveProfileIds(List<String> inactiveProfileIds);

    /**