private <T> Collection<T> getExtensionComponents(Collection<MavenProject> projects, Class<T> role) {
        Collection<T> foundComponents = new LinkedHashSet<>();
        foundComponents.addAll(lookup.lookupList(role));
        foundComponents.addAll(getProjectScopedExtensionComponents(projects, role));
        return foundComponents;
    }

                    List<Plugin> pre = predecessors.get(entry.getKey());
                    if (pre != null) {
                        result.addAll(pre);
                    }
                    result.add(entry.getValue());
                }
                result.addAll(pending);

                builder.plugins(result);
            }
        }

        @Override

                    artifacts = directArtifacts;
                } else {
                    List<Artifact> allArtifacts = new ArrayList<>();
                    allArtifacts.addAll(artifacts);
                    allArtifacts.addAll(directArtifacts);

                    Map<String, Artifact> mergedArtifacts = new LinkedHashMap<>();
                    for (Artifact artifact : allArtifacts) {

            this.repositories = new ArrayList<>(repositories.size());
            for (RemoteRepository repository : repositories) {
                if (repository.isRepositoryManager()) {
                    this.repositories.addAll(repository.getMirroredRepositories());
                } else {
                    this.repositories.add(repository);
                }
            }
            collect = scopesToCollect == null

        this.pomRepositories = new ArrayList<>();
        this.externalRepositories = Collections.unmodifiableList(new ArrayList<>(repositories));
        this.repositories = new ArrayList<>();
        this.repositories.addAll(externalRepositories);
        this.repositoryMerging = repositoryMerging;
        this.repositoryIds = new HashSet<>();
        this.modelPool = modelPool;

    @Override
    public void add(ModelProblem problem) {
        problems.add(problem);

        severities.add(problem.getSeverity());
    }

    public void addAll(Collection<ModelProblem> problems) {
        this.problems.addAll(problems);

        for (ModelProblem problem : problems) {
            severities.add(problem.getSeverity());
        }
    }

    @Override

    }

    @Override
    public Collection<Artifact> getAllArtifacts(Project project) {
        ArrayList<Artifact> result = new ArrayList<>(2);
        result.addAll(project.getArtifacts());
        result.addAll(getAttachedArtifacts(project));
        return Collections.unmodifiableCollection(result);
    }

    @Override
    public void attachArtifact(Project project, Artifact artifact, Path path) {

            List<String> tgt = target.getModules();
            Set<String> excludes = new LinkedHashSet<>(tgt);
            List<String> merged = new ArrayList<>(tgt.size() + src.size());
            merged.addAll(tgt);
            for (int i = 0, n = tgt.size(); i < n; i++) {
                indices.add(i);
            }
            for (int i = 0, n = src.size(); i < n; i++) {
                String s = src.get(i);

            this.repositories = new ArrayList<>(repositories.size());
            for (RemoteRepository repository : repositories) {
                if (repository.isRepositoryManager()) {
                    this.repositories.addAll(repository.getMirroredRepositories());
                } else {
                    this.repositories.add(repository);
                }
            }

            int hash = 17;

        requireNonNull(artifact, "artifact cannot be null");
        Collection<String> versions = new LinkedHashSet<>();

        for (WorkspaceReader reader : readers) {
            versions.addAll(reader.findVersions(artifact));
        }

        return Collections.unmodifiableList(new ArrayList<>(versions));
    }

    public void setReaders(Collection<WorkspaceReader> readers) {