return missingArtifacts != null && !missingArtifacts.isEmpty();
    }

    public List<Artifact> getMissingArtifacts() {
        return missingArtifacts == null ? Collections.emptyList() : Collections.unmodifiableList(missingArtifacts);
    }

    public ArtifactResolutionResult addMissingArtifact(Artifact artifact) {
        missingArtifacts = initList(missingArtifacts);

        missingArtifacts.add(artifact);

        if (project.getRemoteArtifactRepositories() != null) {
            setRemoteArtifactRepositories(Collections.unmodifiableList(project.getRemoteArtifactRepositories()));
        }

        if (project.getPluginArtifactRepositories() != null) {
            setPluginArtifactRepositories(Collections.unmodifiableList(project.getPluginArtifactRepositories()));
        }

        if (project.getActiveProfiles() != null) {

        List<Node> children =
                getChildren().stream().filter(filter).map(n -> n.filter(filter)).collect(Collectors.toList());
        return new WrapperNode(this, Collections.unmodifiableList(children));
    }

    @Override
    public String asString() {
        StringBuilder sb = new StringBuilder();

        DependencyNode node = getDependencyNode();

     * @deprecated Use {@link #getRequiredActiveProfileIds()} and {@link #getOptionalActiveProfileIds()} instead.
     */
    @Deprecated
    public List<String> getActiveProfiles() {
        return Collections.unmodifiableList(new ArrayList<>(getProfileIds(pa -> pa.active)));
    }

    /**
     * Mimics the pre-Maven 4 "inactive profiles" list.

        private final int hashCode;

        public CacheKey(List<? extends ClassRealm> extensionRealms) {
            this.extensionRealms =
                    (extensionRealms != null) ? Collections.unmodifiableList(extensionRealms) : Collections.emptyList();

            this.hashCode = this.extensionRealms.hashCode();
        }

        @Override
        public int hashCode() {
            return hashCode;
        }

    }

    public List<Dependency> getManagedDependencies() {
        DependencyManagement depMngt = project.getModel().getDependencyManagement();
        return (depMngt != null) ? Collections.unmodifiableList(depMngt.getDependencies()) : Collections.emptyList();
    }

    // TODO: this is duplicate of PomArtifactHandlerProvider provided one
    static class PomArtifactHandler implements ArtifactHandler {
        @Override

        return this;
    }

    public List<MavenProject> getTopologicallySortedProjects() {
        return null == topologicallySortedProjects
                ? Collections.emptyList()
                : Collections.unmodifiableList(topologicallySortedProjects);
    }

    public DependencyResolutionResult getDependencyResolutionResult() {
        return dependencyResolutionResult;
    }

            versions.addAll(ideWorkspace.findVersions(artifact));
        }

        versions.addAll(userLocalArtifactRepository.findVersions(artifact));

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

    public String pathOfLocalRepositoryMetadata(ArtifactMetadata metadata, ArtifactRepository repository) {

            }

            @Override
            public List<Lifecycle> getLifecycles() {
                try {
                    return Collections.unmodifiableList(new ArrayList<>(delegate.getMojoDescriptor()
                            .getPluginDescriptor()
                            .getLifecycleMappings()
                            .values()));

        return Collections.unmodifiableList(new MappedList<>(
                ((DefaultProject) project).getProject().getRemoteProjectRepositories(), session::getRemoteRepository));
    }

    @Override
    public List<RemoteRepository> getRemotePluginRepositories(Project project) {
        return Collections.unmodifiableList(new MappedList<>(