return doGet(userProperties, Constants.MAVEN_DEPLOY_BUILD_POM, true);
    }

    private static boolean doGet(Properties userProperties, String key, boolean def) {
        return doGet(userProperties != null ? userProperties.get(key) : null, def);
    }

    private static boolean doGet(Map<String, ?> userProperties, String key, boolean def) {

            this.userProperties = userProperties;
            this.systemProperties = systemProperties;
            this.startTime = startTime;
            this.topDirectory = topDirectory;
            this.rootDirectory = rootDirectory;
        }

        public Builder withUserProperties(@Nonnull Map<String, String> userProperties) {
            this.userProperties = new HashMap<>(userProperties);

            this.systemProperties = systemProperties;
            return this;
        }

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

        public ModelBuilderRequestBuilder repositoryMerging(RepositoryMerging repositoryMerging) {

    @Override
    public ProjectBuilderConfiguration setUserProperties(Properties userProperties) {
        this.userProperties = userProperties;
        return this;
    }

    @Override
    public Properties getUserProperties() {
        if (userProperties == null) {
            userProperties = new Properties();
        }

        return userProperties;
    }

    @Override
    public Properties getExecutionProperties() {

     * @return The user properties with contributions.
     */
    default Map<String, String> contribute(ProtoSession protoSession) {
        HashMap<String, String> userProperties = new HashMap<>(protoSession.getUserProperties());
        contribute(userProperties);
        return userProperties;
    }

    ProjectBuilderConfiguration setLocalRepository(ArtifactRepository localRepository);

    ProjectBuilderConfiguration setUserProperties(Properties userProperties);

    ProjectBuilderConfiguration setExecutionProperties(Properties executionProperties);

    Date getBuildStartTime();

    ProjectBuilderConfiguration setBuildStartTime(Date buildStartTime);

     * These properties can be set using the -D command-line option.
     *
     * @return an unmodifiable map of user properties
     */
    @Nonnull
    Map<String, String> userProperties();

    /**
     * Returns a map of system properties for the Maven execution.
     * These include both Java system properties and Maven-specific system properties.
     *

     *
     * @return an {@link Optional} containing the map of user properties, or empty if not set
     */
    @Nonnull
    Optional<Map<String, String>> userProperties();

    /**
     * Indicates whether to show the version information and exit.
     *
     * @return an {@link Optional} containing the boolean flag, or empty if not set
     */
    @Nonnull

     * - Configured by users through external means like CLI options (USER_PROPERTIES)
     * - Defined in the project's POM file (MODEL)
     *
     * @return the source of the configuration property, defaults to USER_PROPERTIES
     * @see Source for detailed information about each source type and when it's used
     */
    Source source() default Source.USER_PROPERTIES;

    /**
     * Specifies the type of the configuration property.