return session;
        }

        if (session != null) {
            LocalRepositoryManager lrm = session.getLocalRepositoryManager();
            if (lrm != null && lrm.getRepository().getBasedir().equals(new File(repository.getBasedir()))) {
                return session;
            }
        } else {
            session = new DefaultRepositorySystemSession();
        }

    @Nonnull
    @Override
    public ArtifactCoordinate toCoordinate() {
        return session.createArtifactCoordinate(this);
    }

    @Override
    public boolean equals(Object o) {
        return o instanceof Artifact && Objects.equals(key(), ((Artifact) o).key());
    }

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

    @Override
    public String toString() {

        List<RemoteRepository> newRepositories =
                Collections.singletonList(ArtifactDescriptorUtils.toRemoteRepository(repository));

        if (ProjectBuildingRequest.RepositoryMerging.REQUEST_DOMINANT.equals(repositoryMerging)) {
            repositories = remoteRepositoryManager.aggregateRepositories(session, repositories, newRepositories, true);
        } else {
            pomRepositories =

            throws ArtifactMetadataRetrievalException {
        Set<Artifact> dependencies = new HashSet<>();

        if ("g".equals(artifact.getArtifactId())) {
            Artifact a = null;
            try {
                a = factory.createBuildArtifact("org.apache.maven", "h", "1.0", "jar");
                dependencies.add(a);

    }

    private Plugin findPlugin(String groupId, String artifactId, Collection<Plugin> plugins) {
        for (Plugin plugin : plugins) {
            if (artifactId.equals(plugin.getArtifactId()) && groupId.equals(plugin.getGroupId())) {
                return plugin;
            }
        }

        return null;
    }

    }

    private PluginInfo extractPluginInfo(Artifact artifact) {
        // sanity: jar, no classifier and file exists
        if (artifact != null
                && "jar".equals(artifact.getExtension())
                && "".equals(artifact.getClassifier())
                && artifact.getPath() != null) {
            Path artifactPath = artifact.getPath();
            if (Files.isRegularFile(artifactPath)) {

                sb.append("] ");
                sb.append(problem.getMessage());
                String loc = Stream.of(
                                problem.getModelId().equals(modelId) ? problem.getModelId() : "",
                                problem.getModelId().equals(modelId) ? problem.getSource() : "",
                                problem.getLineNumber() > 0 ? "line " + problem.getLineNumber() : "",

        boolean unknown = false;
        for (PathType type : types) {
            if (filter.test(type)) {
                if (JavaPathType.CLASSES.equals(type)) {
                    classes = true;
                } else if (JavaPathType.MODULES.equals(type)) {
                    modules = true;
                } else {
                    unknown = true;
                }
                if (selected == null) {

                reverseValue = true;
                propValue = propValue.substring(1);
            }

            // we have a value, so it has to match the system value...
            return reverseValue != propValue.equals(sysValue);
        } else {
            return reverseName != (sysValue != null && !sysValue.isEmpty());
        }
    }

    @Override

    }

    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof VersionRange)) {
            return false;
        }
        VersionRange other = (VersionRange) obj;

        return Objects.equals(recommendedVersion, other.recommendedVersion)
                && Objects.equals(restrictions, other.restrictions);
    }