class DefaultPluginVersionRequest implements PluginVersionRequest {

    private String groupId;

    private String artifactId;

    private Model pom;

    private List<RemoteRepository> repositories = Collections.emptyList();

    private RepositorySystemSession session;

    /**
     * Creates an empty request.
     */
    public DefaultPluginVersionRequest() {}

    /**
     * Creates a request for the specified plugin by copying settings from the specified build session. If the session
     * has a current project, its plugin repositories will be used as well.
     *
     * @param plugin The plugin for which to resolve a version, must not be {@code null}.
     * @param session The Maven session to use, must not be {@code null}.
     */
    public DefaultPluginVersionRequest(Plugin plugin, MavenSession session) {
        setGroupId(plugin.getGroupId());
        setArtifactId(plugin.getArtifactId());

        setRepositorySession(session.getRepositorySession());

        MavenProject project = session.getCurrentProject();
        if (project != null) {
            setRepositories(project.getRemotePluginRepositories());
        }
    }

    /**
     * Creates a request for the specified plugin using the given repository session and plugin repositories.
     *
     * @param plugin The plugin for which to resolve a version, must not be {@code null}.
     * @param session The repository session to use, must not be {@code null}.
     * @param repositories The plugin repositories to query, may be {@code null}.
     */
    public DefaultPluginVersionRequest(
            Plugin plugin, RepositorySystemSession session, List<RemoteRepository> repositories) {
        setGroupId(plugin.getGroupId());
        setArtifactId(plugin.getArtifactId());

        setRepositorySession(session);

        setRepositories(repositories);
    }

    public String getGroupId() {
        return groupId;
    }

    public DefaultPluginVersionRequest setGroupId(String groupId) {
        this.groupId = groupId;

        return this;
    }

    public String getArtifactId() {
        return artifactId;
    }

    public DefaultPluginVersionRequest setArtifactId(String artifactId) {
        this.artifactId = artifactId;

        return this;
    }

    public Model getPom() {
        return pom;
    }

    public DefaultPluginVersionRequest setPom(Model pom) {
        this.pom = pom;

        return this;
    }

    public List<RemoteRepository> getRepositories() {
        return repositories;
    }

    public DefaultPluginVersionRequest setRepositories(List<RemoteRepository> repositories) {<FILL_FUNCTION_BODY>}

    public RepositorySystemSession getRepositorySession() {
        return session;
    }

    public DefaultPluginVersionRequest setRepositorySession(RepositorySystemSession session) {
        this.session = session;

        return this;
    }
}

        if (repositories != null) {
            this.repositories = Collections.unmodifiableList(repositories);
        } else {
            this.repositories = Collections.emptyList();
        }

        return this;
    
<no_super_class>