* line.
     *
     * @param userProperties The user properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    public DefaultProfileActivationContext setUserProperties(Map<String, String> userProperties) {
        this.userProperties = unmodifiable(userProperties);
        return this;
    }

    @Override
    public Path getProjectDirectory() {
        return projectDirectory;
    }

    /**
     * Invoked just before session is created with a mutable map that carries collected user properties so far.
     *
     * @param userProperties The mutable user properties, never {@code null}.
     */
    void contribute(Map<String, String> userProperties);

/**
 *
 * @since 4.0.0
 */
class DefaultModelTransformerContext implements ModelTransformerContext {
    final ModelProcessor modelLocator;

    final Map<String, String> userProperties = new ConcurrentHashMap<>();

    final Map<Path, Holder> modelByPath = new ConcurrentHashMap<>();

    final Map<GAKey, Holder> modelByGA = new ConcurrentHashMap<>();

    public static class Holder {

    public Properties getUserProperties() {
        return request.getUserProperties();
    }

    @Override
    public FilterModelBuildingRequest setUserProperties(Properties userProperties) {
        request.setUserProperties(userProperties);

        return this;
    }

    @Override
    public Date getBuildStartTime() {
        return request.getBuildStartTime();
    }

    @Override

@Priority(50)
@SuppressWarnings("checkstyle:MagicNumber")
public final class UserPropertiesArtifactRelocationSource implements MavenArtifactRelocationSource {
    public static final String NAME = "userProperties";
    private static final Logger LOGGER = LoggerFactory.getLogger(UserPropertiesArtifactRelocationSource.class);

    private static final String CONFIG_PROP_RELOCATIONS_ENTRIES = "maven.relocations.entries";

            public Path locate(Path path) {
                return context.locate(path);
            }

            @Override
            public String getUserProperty(String key) {
                return context.userProperties.computeIfAbsent(
                        key, k -> request.getUserProperties().getProperty(key));
            }

            @Override
            public Model getRawModel(Path from, String gId, String aId) {

            public Path locate(Path path) {
                return context.locate(path);
            }

            @Override
            public String getUserProperty(String key) {
                return context.userProperties.computeIfAbsent(
                        key, k -> request.getUserProperties().get(key));
            }

            @Override
            public Model getRawModel(Path from, String gId, String aId) {