}

    public ResolutionGroup retrieve(MetadataResolutionRequest request) {
        return retrieve(request.getArtifact(), request.getLocalRepository(), request.getRemoteRepositories());
    }

    /**
     * Gets the remote repositories to use for the resolution.
     *
     * @return The remote repositories to use for the resolution, never {@code null}.
     */
    List<ArtifactRepository> getRemoteRepositories();

    /**
     * Sets the remote repositories to use for the resolution.
     *
     * @param remoteRepositories The remote repositories to use for the resolution.
     * @return This request, never {@code null}.

     */
    @Nonnull
    List<Node> getChildren();

    /**
     * @return repositories of this node
     */
    @Nonnull
    List<RemoteRepository> getRemoteRepositories();

    /**
     * The repository where this artifact has been downloaded from.
     */
    @Nonnull
    Optional<RemoteRepository> getRepository();

    /**

                nonNull(session).getRepositorySession(),
                repositorySystem,
                remoteRepositories,
                remoteRepositories == null
                        ? map(session.getRequest().getRemoteRepositories(), RepositoryUtils::toRepo)
                        : null,
                lookup);
        this.mavenSession = session;
        this.mavenRepositorySystem = mavenRepositorySystem;

        try {
            List<ArtifactRepository> repositories = session.toArtifactRepositories(
                    request.getRepositories() != null ? request.getRepositories() : session.getRemoteRepositories());
            ProjectBuildingRequest req = new DefaultProjectBuildingRequest()
                    .setRepositorySession(session.getSession())
                    .setRemoteRepositories(repositories)

    public Iterator<ResolutionNode> getChildrenIterator() {
        return children.iterator();
    }

    public int getDepth() {
        return depth;
    }

    public List<ArtifactRepository> getRemoteRepositories() {
        return remoteRepositories;
    }

    public boolean isActive() {
        return active;
    }

    public void enable() {
        active = true;

        return this.classifier;
    }

    /** @return the path */
    public String getPath() {
        return this.path;
    }

    public List<ArtifactRepository> getRemoteRepositories() {
        return remoteRepositories;
    }

    public String getOriginalMessage() {
        return originalMessage;
    }

            }

            MavenExecutionRequest req = session.getRequest();
            if (req != null) {
                request.setRemoteRepositories(req.getRemoteRepositories());
            }
        } else {
            Properties props = new Properties();
            EnvironmentUtils.addEnvVars(props);
            props.putAll(System.getProperties());

        }

        public List<ArtifactVersion> retrieveAvailableVersions(MetadataResolutionRequest request)
                throws ArtifactMetadataRetrievalException {
            return retrieveAvailableVersions(
                    request.getArtifact(), request.getLocalRepository(), request.getRemoteRepositories());
        }
    }

            throws RepositoryMetadataResolutionException {
        ArtifactRepository localRepo = request.getLocalRepository();
        List<ArtifactRepository> remoteRepositories = request.getRemoteRepositories();

        if (!request.isOffline()) {
            Date localCopyLastModified = null;
            if (metadata.getBaseVersion() != null) {