lifecycleMojo.setGoal(s.trim());
        return lifecycleMojo;
    };

    @Override
    public String toString() {
        return Optional.ofNullable(getMojos()).orElse(Collections.emptyList()).stream()
                .map(LifecycleMojo::getGoal)
                .collect(Collectors.joining(","));
    }

    @Deprecated

                        .flatMap(r -> r.getProblems().stream())
                        .filter(p -> p.getException() instanceof CycleDetectedException)
                        .findAny()
                        .orElse(null);
                if (cycle != null) {
                    throw new RuntimeException(new ProjectCycleException(
                            "The projects in the reactor contain a cyclic reference: " + cycle.getMessage(),

                            "No unique Source for %s:%s: %s and %s",
                            groupId, artifactId, a.getLocation(), b.getLocation()));
                })
                .orElse(null);
    }

    public void putSource(String groupId, String artifactId, ModelSource source) {
        mappedSources
                .computeIfAbsent(groupId + ":" + artifactId, k -> new HashSet<>())

                allDependencyScopes.stream().filter(s -> !s.isTransitive()).collect(Collectors.toSet());
        DependencyScope system =
                internalScopeManager.getDependencyScope(DS_SYSTEM).orElse(null);

        ArrayList<ResolutionScope> result = new ArrayList<>();
        result.add(internalScopeManager.createResolutionScope(
                RS_NONE,
                InternalScopeManager.Mode.REMOVE,

            this.topLevelProject = projects.stream()
                    .filter(project -> project.isExecutionRoot())
                    .findFirst()
                    .orElse(first);
        } else {
            this.currentProject = new ThreadLocal<>();
            this.topLevelProject = null;
        }
        this.projects = projects;
    }

        org.eclipse.aether.scope.DependencyScope system = internalScopeManager
                .getDependencyScope(DependencyScope.SYSTEM.id())
                .orElse(null);

        ArrayList<org.eclipse.aether.scope.ResolutionScope> result = new ArrayList<>();
        result.add(internalScopeManager.createResolutionScope(
                RS_NONE,

     */
    private LifecycleMapping lookupLifecycleMapping(final String packaging) {
        return lookup.lookupOptional(LifecycleMapping.class, packaging).orElse(null);
    }

    private void parseLifecyclePhaseDefinitions(Map<Plugin, Plugin> plugins, String phase, LifecyclePhase goals) {
        InputSource inputSource = new InputSource();

    // weirdness.
    public MavenProject getTopLevelProject() {
        return sortedProjects.stream()
                .filter(MavenProject::isExecutionRoot)
                .findFirst()
                .orElse(null);
    }

    public List<MavenProject> getSortedProjects() {
        return sortedProjects;
    }

    public boolean hasMultipleProjects() {
        return sortedProjects.size() > 1;
    }

                org.eclipse.aether.artifact.Artifact aetherArtifact = session.toArtifact(coord);
                Artifact artifact = session.getArtifact(aetherArtifact);
                Path path = artifactManager.getPath(artifact).orElse(null);
                if (path != null) {
                    paths.put(artifact, path);
                } else {
                    requests.add(new ArtifactRequest(aetherArtifact, repositories, null));
                }

        if (artifact == null) {
            return null;
        }

        Artifact result = toArtifact(artifact);

        List<Exclusion> excl = Optional.ofNullable(exclusions).orElse(Collections.emptyList()).stream()
                .map(RepositoryUtils::toExclusion)
                .collect(Collectors.toList());
        return new Dependency(result, artifact.getScope(), artifact.isOptional(), excl);