this.projectSettingsSource = projectSettingsSource;
            return this;
        }

        public SettingsBuilderRequestBuilder userSettingsSource(Source userSettingsSource) {
            this.userSettingsSource = userSettingsSource;
            return this;
        }

        public SettingsBuilderRequestBuilder interpolationSource(UnaryOperator<String> interpolationSource) {

        return this;
    }

    @Override
    public SettingsSource getUserSettingsSource() {
        return userSettingsSource;
    }

    @Override
    public DefaultSettingsBuildingRequest setUserSettingsSource(SettingsSource userSettingsSource) {
        this.userSettingsSource = userSettingsSource;

        return this;
    }

    @Override
    public Properties getSystemProperties() {

     */
    @Nonnull
    default SettingsBuilderResult build(
            @Nonnull Session session, @Nonnull Source installationSettingsSource, @Nonnull Source userSettingsSource) {
        return build(session, installationSettingsSource, null, userSettingsSource);
    }

    /**
     * Builds the effective settings of the specified settings paths.
     *
     * @return the result of the settings building, never {@code null}

     * precedence.
     *
     * @param userSettingsSource The user settings source, may be {@code null} to disable user settings.
     * @return This request, never {@code null}.
     */
    SettingsBuildingRequest setUserSettingsSource(SettingsSource userSettingsSource);

    /**

        Settings globalSettings = readSettings(globalSettingsSource, request, problems);

        Source userSettingsSource = getSettingsSource(request.getUserSettingsFile(), request.getUserSettingsSource());
        Settings userSettings = readSettings(userSettingsSource, request, problems);

        settingsMerger.merge(userSettings, globalSettings, TrackableBase.GLOBAL_LEVEL);

        problems.setSource("");

                        projectSettingsFile != null && Files.exists(projectSettingsFile)
                                ? Sources.fromPath(projectSettingsFile)
                                : null)
                .userSettingsSource(
                        userSettingsFile != null && Files.exists(userSettingsFile)
                                ? Sources.fromPath(userSettingsFile)
                                : null)