}

    @Nullable
    @Override
    public Long getSelectedVariant() {
        NodeState node = getSelectedNode();
        if (node == null) {
            return null;
        } else {
            return node.getNodeId();
        }
    }

    @Nullable
    public NodeState getSelectedNode() {
        if (resolvedVariant != null) {
            return resolvedVariant;
        }