if (userProperties == null) {
            userProperties = new Properties();
        }

        return userProperties;
    }

    @Override
    public DefaultModelBuildingRequest setUserProperties(Properties userProperties) {
        if (userProperties != null) {
            this.userProperties = new Properties();
            this.userProperties.putAll(userProperties);
        } else {

            this.systemProperties = systemProperties;
            return this;
        }

        public ModelBuilderRequestBuilder userProperties(Map<String, String> userProperties) {
            this.userProperties = userProperties;
            return this;
        }

        public ModelBuilderRequestBuilder repositoryMerging(RepositoryMerging repositoryMerging) {

        }
        Path propertiesFile = mavenConf.resolve("maven.properties");
        MavenPropertiesLoader.loadProperties(userProperties, propertiesFile, callback, false);

        // CLI specified properties are most dominant
        userProperties.putAll(userSpecifiedProperties);

        return toMap(userProperties);
    }

    protected abstract List<O> parseCliOptions(LocalContext context) throws ParserException, IOException;

            Lookup lookup,
            Context context) {
        super(session, repositorySystem, repositories, resolverRepositories, lookup);
        userProperties = context.userProperties;
        systemProperties = context.systemProperties;
    }

    /**
     *
     */
    public static Session create() {
        Map<String, String> properties = new HashMap<>();

        return this;
    }

    @Override
    public MavenExecutionRequest setUserProperties(Properties userProperties) {
        if (userProperties != null) {
            this.userProperties = new Properties();
            this.userProperties.putAll(userProperties);
        } else {
            this.userProperties = null;
        }

        return this;
    }

    @Override

        // LOG COLOR
        Options mavenOptions = invokerRequest.options();
        Map<String, String> userProperties = invokerRequest.userProperties();
        String styleColor = mavenOptions
                .color()
                .orElse(userProperties.getOrDefault(
                        Constants.MAVEN_STYLE_COLOR_PROPERTY, userProperties.getOrDefault("style.color", "auto")));

        data.put("workingDirectory", invokerRequest.cwd().toString());
        data.put("systemProperties", toProperties(invokerRequest.systemProperties()));
        data.put("userProperties", toProperties(invokerRequest.userProperties()));
        data.put("versionProperties", CLIReportingUtils.getBuildProperties());
        context.eventSpyDispatcher.init(() -> data);
    }

    @Override

        container.setLoggerManager(createLoggerManager());
        R invokerRequest = context.invokerRequest;
        Function<String, String> extensionSource = expression -> {
            String value = invokerRequest.userProperties().get(expression);
            if (value == null) {
                value = invokerRequest.systemProperties().get(expression);
            }
            return value;
        };

        request.source(new PomConsumerModelSource(project.getModel().getPomPath(), src));
        request.locationTracking(false);
        request.systemProperties(session.getSystemProperties());
        request.userProperties(session.getUserProperties());
        request.lifecycleBindingsInjector(lifecycleBindingsInjector::injectLifecycleBindings);
        ModelBuilder.ModelBuilderSession mbSession =

     * line.
     *
     * @param userProperties The user properties, may be {@code null}.
     * @return This request, never {@code null}.
     */
    MavenExecutionRequest setUserProperties(Properties userProperties);

    /**
     * Gets the user properties to use for interpolation and profile activation. The user properties have been