@Override
    public Path getTopDirectory() {
        return getMavenSession().getRequest().getTopDirectory();
    }

    @Nonnull
    @Override
    public List<Project> getProjects() {
        return getProjects(getMavenSession().getProjects());
    }

    @Nonnull
    @Override
    public Map<String, Object> getPluginContext(Project project) {
        requireNonNull(project, "project" + " cannot be null");

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

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

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

                    forkedProjects.add(forkedProject);

            }
        }
        return projectLocalRepository;
    }

    private MavenProject getProject(Artifact artifact) {
        return getProject(artifact, getProjects());
    }

    private MavenProject getProject(Artifact artifact, Map<String, Map<String, Map<String, MavenProject>>> projects) {
        return projects.getOrDefault(artifact.getGroupId(), Collections.emptyMap())

            Map<Artifact, File> reactorProjects =
                    new HashMap<>(session.getProjects().size());
            for (MavenProject reactorProject : session.getProjects()) {
                reactorProjects.put(
                        reactorProject.getArtifact(),
                        reactorProject.getArtifact().getFile());
            }

                return result;
            }

            result.setTopologicallySortedProjects(session.getProjects());

            result.setProject(session.getTopLevelProject());

            validatePrerequisitesForNonMavenPluginProjects(session.getProjects());

            validateRequiredProfiles(session, request.getProfileActivation());
            if (session.getResult().hasExceptions()) {

    }

    List<Project> getProjects(List<org.apache.maven.project.MavenProject> projects);

    /**
     * May return null if the input project is null or is not part of the reactor.
     */
    @Nullable
    Project getProject(org.apache.maven.project.MavenProject project);

                    .getUpstreamProjects(projectBuild.getProject(), false)
                    .isEmpty()) {
                result.add(projectBuild.getProject());
            }
        }
        if (result.isEmpty() && !projectBuilds.isEmpty()) {
            // Must return at least one project
            result.add(projectBuilds.get(0).getProject());
        }

            throws ExecutionException, InterruptedException {
        int nThreads = Math.min(
                session.getRequest().getDegreeOfConcurrency(),
                session.getProjects().size());
        boolean parallel = nThreads > 1;
        // Propagate the parallel flag to the root session and all the cloned sessions in each project segment
        session.setParallel(parallel);

        InternalMavenSession mSession = InternalMavenSession.from(iSession);
        MavenSession session = mSession.getMavenSession();

        session.setProjects(projects);
        session.setAllProjects(session.getProjects());

        return session;
    }

    protected void initRepoSession(
            MavenExecutionRequest mavenExecutionRequest, ProjectBuildingRequest projectBuildingRequest)

            MavenSession session = legacySupport.getSession();
            if (session != null) {
                if (session.getProjects() != null) {
                    pomRepositories = session.getProjects().stream()
                            .filter(p -> artifact.equals(p.getArtifact()))
                            .findFirst()