? parentData.getGroupId()
                                : currentData.getRawModel().getGroupId());

                currentData.setVersion(
                        currentData.getRawModel().getVersion() == null
                                ? parentData.getVersion()
                                : currentData.getRawModel().getVersion());

        this.session = copiedSession;
        final ProjectDependencyGraph dependencyGraph = getSession().getProjectDependencyGraph();
        nonTransitiveUpstreamProjects = dependencyGraph.getUpstreamProjects(getProject(), false);
        transitiveUpstreamProjects = dependencyGraph.getUpstreamProjects(getProject(), true);
    }

    public MavenSession getSession() {
        return session;
    }

    public MavenProject getProject() {

    } // -- void setGroupId( String )

    /**
     * Set the version of the extension.
     *
     * @param version a version object.
     */
    public void setVersion(String version) {
        this.version = version;
    } // -- void setVersion( String )

    /**
     * Gets the identifier of the extension.
     *

        boolean missing = event.getFile() == null;
        if (missing) {
            // missing artifact - let's track the path anyway
            File dir = event.getSession().getLocalRepository().getBasedir();
            dir = new File(
                    dir, event.getSession().getLocalRepositoryManager().getPathForLocalArtifact(event.getArtifact()));
            trackingDir = dir.getParentFile().toPath().resolve(".tracking");
        } else {

        result.setArtifactId("A");
        result.setVersion("1.2");
        return result;
    }

    static Dependency toDependency(MavenProject mavenProject) {
        final Dependency dependency = new Dependency();
        dependency.setArtifactId(mavenProject.getArtifactId());
        dependency.setGroupId(mavenProject.getGroupId());
        dependency.setVersion(mavenProject.getVersion());
        return dependency;

        resolve(artifact, remoteRepositories, getSession(localRepository));
    }

    @Override
    public void resolveAlways(
            Artifact artifact, List<ArtifactRepository> remoteRepositories, ArtifactRepository localRepository)
            throws ArtifactResolutionException, ArtifactNotFoundException {
        resolve(artifact, remoteRepositories, getSession(localRepository));
    }

    private void resolve(

     * @return a new {@link DependencyCoordinates} object
     *
     * @throws IllegalArgumentException if {@code request} is null or
     *         if {@code request.getSession()} is null or invalid
     */
    @Nonnull
    DependencyCoordinates create(@Nonnull DependencyCoordinatesFactoryRequest request);

    @Nonnull

        Metadata metadata = new Metadata();
        metadata.setVersioning(versioning);
        metadata.setGroupId(artifact.getGroupId());
        metadata.setArtifactId(artifact.getArtifactId());
        metadata.setVersion(artifact.getBaseVersion());
        metadata.setModelVersion("1.1.0");
        return metadata;
    }

    public void bind(Artifact artifact) {
        artifacts.add(artifact);
    }

    @Deprecated

        if (Artifact.LATEST_VERSION.equals(version) || Artifact.RELEASE_VERSION.equals(version)) {
            // meta-versions are not valid <version/> values...don't write them.
            metadata.setVersion(null);
        }

        if (changed || !metadataFile.exists()) {
            metadataFile.getParentFile().mkdirs();
            try (OutputStream output = Files.newOutputStream(metadataFile.toPath())) {

        this.source = source;
        this.model = model;
        setGroupId(groupId);
        setArtifactId(artifactId);
        setVersion(version);
    }

    public ModelSource getSource() {
        return source;
    }

    /**
     * Gets the model being wrapped.
     *
     * @return The model or {@code null} if not set.
     */