}

    /**
     * Create a key using the given class and id.
     */
    static <T> Key<T> key(Class<T> clazz, Object id) {
        return new Key<>(clazz, id);
    }

    /**
     * Key used to query the session data
     * @param <T> the type of the object associated to this key
     */
    final class Key<T> {

        private final Class<T> type;
        private final Object id;

            ArtifactMetadata query, ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories) {
        this.query = query;
        this.localRepository = localRepository;
        this.remoteRepositories = remoteRepositories;
    }

    // --------------------------------------------------------------------
    public ArtifactMetadata getQuery() {
        return query;
    }

     *
     * @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());