@Override
    public Optional<Path> getPath(@Nonnull Artifact artifact) {
        String id = id(nonNull(artifact, "artifact"));
        if (session.getMavenSession().getAllProjects() != null) {
            for (MavenProject project : session.getMavenSession().getAllProjects()) {
                if (id.equals(id(project.getArtifact()))
                        && project.getArtifact().getFile() != null) {

            this.whiteList.put(project, null);
        }
    }

    /**
     * @since 3.5.0
     */
    public List<MavenProject> getAllProjects() {
        return this.projectDependencyGraph.getAllProjects();
    }

    public List<MavenProject> getSortedProjects() {
        if (sortedProjects == null) {
            sortedProjects = applyFilter(projectDependencyGraph.getSortedProjects());

                addExceptionToResult(result, session.getResult().getExceptions().get(0));
                persistResumptionData(result, session);
                return result;
            } else {
                session.getAllProjects().stream()
                        .filter(MavenProject::isExecutionRoot)
                        .findFirst()
                        .ifPresent(buildResumptionDataRepository::removeResumptionData);
            }

    }

    // groupId -> (artifactId -> (version -> project)))
    private Map<String, Map<String, Map<String, MavenProject>>> getAllProjects() {
        // compute the projects mapping
        if (allProjects == null) {
            List<MavenProject> allProjects = session.getAllProjects();
            if (allProjects != null) {
                Map<String, Map<String, Map<String, MavenProject>>> map = new HashMap<>();

            this.projects.put(id, project);
            this.order.put(project, index);
        }
    }

    /**
     * @since 3.5.0
     */
    public List<MavenProject> getAllProjects() {
        return this.allProjects;
    }

    public List<MavenProject> getSortedProjects() {
        return new ArrayList<>(sorter.getSortedProjects());
    }

 */
public interface ProjectDependencyGraph {

    /**
     * Gets all collected projects.
     *
     * @return All collected projects.
     *
     * @since 3.5.0
     */
    List<MavenProject> getAllProjects();

    /**
     * Gets all projects in their intended build order, i.e. after topologically sorting the projects according to their
     * interdependencies.
     *

        if (session.getProjectDependencyGraph() != null || session.getProjects() != null) {
            final ProjectDependencyGraph graph =
                    new DefaultProjectDependencyGraph(session.getAllProjects(), session.getProjects());

            result = Result.success(graph);
        }

        return result;
    }

        dependencies.add(new Dependency(X, C));
        dependencies.add(new Dependency(Y, B));
        dependencies.add(new Dependency(Z, C));
        return dependencies;
    }

    public List<MavenProject> getAllProjects() {
        return Arrays.asList(A, B, C, X, Y, Z, UNKNOWN);
    }

    public List<MavenProject> getSortedProjects() {

                return Collections.emptyList();
            }

            @Override
            public List<MavenProject> getAllProjects() {
                return session.getAllProjects();
            }

            @Override
            public List<MavenProject> getSortedProjects() {
                return Collections.singletonList(session.getCurrentProject());

    public void setProjectMap(Map<String, MavenProject> projectMap) {
        this.projectMap = projectMap;
    }

    /** This is a provisional method and may be removed */
    public List<MavenProject> getAllProjects() {
        return allProjects;
    }

    /** This is a provisional method and may be removed */
    public void setAllProjects(List<MavenProject> allProjects) {
        this.allProjects = allProjects;