repository.setId(MavenRepositorySystem.DEFAULT_REMOTE_REPO_ID);
        repository.setUrl("file://" + repoDir.toURI().getPath());
        repository.setReleases(policy);
        repository.setSnapshots(policy);

        return Arrays.asList(mavenRepositorySystem.buildArtifactRepository(repository));
    }

    protected List<ArtifactRepository> getPluginArtifactRepositories() throws InvalidRepositoryException {

        modelRepository.setUrl(settingsRepository.getUrl());
        modelRepository.setReleases(fromSettingsRepositoryPolicy(settingsRepository.getReleases()));
        modelRepository.setSnapshots(fromSettingsRepositoryPolicy(settingsRepository.getSnapshots()));
        return modelRepository;
    }

    public static org.apache.maven.model.RepositoryPolicy fromSettingsRepositoryPolicy(

                && Objects.equals(r1.getUrl(), r2.getUrl())
                && repositoryPolicyEquals(r1.getReleases(), r2.getReleases())
                && repositoryPolicyEquals(r1.getSnapshots(), r2.getSnapshots());
    }

    private static boolean repositoryPolicyEquals(ArtifactRepositoryPolicy p1, ArtifactRepositoryPolicy p2) {
        if (p1 == p2) {
            return true;
        }

    void mergeSnapshotWithEmptyList() throws Exception {
        Snapshot snapshot = new Snapshot();
        snapshot.setBuildNumber(3);
        snapshot.setTimestamp("20200710.072412");
        target.getVersioning().setSnapshot(snapshot);
        target.getVersioning().setLastUpdated("20200921071745");
        SnapshotVersion sv = new SnapshotVersion();
        sv.setClassifier("sources");
        sv.setExtension("jar");

            List<ArtifactRepositoryPolicy> snapshotPolicies = new ArrayList<>(aliasedRepos.size());

            for (ArtifactRepository aliasedRepo : aliasedRepos) {
                snapshotPolicies.add(aliasedRepo.getSnapshots());
            }

            ArtifactRepositoryPolicy snapshotPolicy = getEffectivePolicy(snapshotPolicies);

            ArtifactRepository aliasedRepo = aliasedRepos.get(0);

                                final Versioning repaired = new Versioning();
                                repaired.setLastUpdated(versioning.getLastUpdated());
                                repaired.setSnapshot(new Snapshot());
                                repaired.getSnapshot().setLocalCopy(true);
                                versioning = repaired;

                    if (releases != null) {
                        sb.append(", releases=").append(releases.isEnabled());
                    }

                    ArtifactRepositoryPolicy snapshots = remoteRepository.getSnapshots();
                    if (snapshots != null) {
                        sb.append(", snapshots=").append(snapshots.isEnabled());
                    }

                    sb.append(')');

        }

        public String getId() {
            return repository.getId();
        }

        public void setId(String id) {}

        public ArtifactRepositoryPolicy getSnapshots() {
            return null;
        }

        public void setSnapshotUpdatePolicy(ArtifactRepositoryPolicy policy) {}

        public ArtifactRepositoryPolicy getReleases() {
            return null;

        return layout;
    }

    public void setSnapshotUpdatePolicy(ArtifactRepositoryPolicy snapshots) {
        this.snapshots = snapshots;
    }

    public ArtifactRepositoryPolicy getSnapshots() {
        return snapshots;
    }

    public void setReleaseUpdatePolicy(ArtifactRepositoryPolicy releases) {
        this.releases = releases;
    }

    @Override
    public boolean isUpdateRequired(Artifact artifact, ArtifactRepository repository) {
        File file = artifact.getFile();

        ArtifactRepositoryPolicy policy = artifact.isSnapshot() ? repository.getSnapshots() : repository.getReleases();

        if (!policy.isEnabled()) {
            if (getLogger().isDebugEnabled()) {
                getLogger()