*
 * @since 3.0
 */
// TODO Kristian wonders if this class really is necessary and if it overlaps other concepts.
public final class ProjectIndex {

    private final Map<String, MavenProject> projects;

    private final Map<String, Integer> indices;

    public ProjectIndex(List<MavenProject> projects) {
        this.projects = new HashMap<>(projects.size() * 2);
        this.indices = new HashMap<>(projects.size() * 2);

                    ProjectIndex projectIndex = session.getSession()
                            .getData()
                            .computeIfAbsent(PROJECT_INDEX, () -> new ProjectIndex(session.getProjects()));

                    int index = projectIndex.getIndices().get(projectId);

                    MavenProject forkedProject = projectIndex.getProjects().get(projectId);

        private final ProjectBuildingRequest request;
        private final InternalSession session;
        private final ModelBuilder.ModelBuilderSession modelBuilderSession;
        private final Map<String, MavenProject> projectIndex = new ConcurrentHashMap<>(256);

        // Store computed repositories per project to avoid leakage between projects
        private final Map<String, List<ArtifactRepository>> projectRepositories = new ConcurrentHashMap<>();