component = components.get(instanceId);
        if (component == null) {
            throw new IllegalStateException("No component with id " + instanceId + " found.");
        }
        visitor.visitComponentDetails(component.getId(), component.getMetadata().getModuleVersionId());
        List<ResolvedVariantResult> availableVariants;
        if (decoder.readBoolean()) {
            // use all available variants

     */
    void startVisitComponent(Long id, ComponentSelectionReason selectionReason, @Nullable String repoName);

    /**
     * Visit graph independent details of the component.
     */
    void visitComponentDetails(ComponentIdentifier componentId, ModuleVersionIdentifier moduleVersion);

    /**
     * Visit a selected variant of the component.
     */
    void visitSelectedVariant(Long id, ResolvedVariantResult variant);

        ResolutionResultGraphBuilder builder = new ResolutionResultGraphBuilder();
        builder.startVisitComponent(0L, ComponentSelectionReasons.root(), null);
        builder.visitComponentDetails(componentIdentifier, id);
        builder.visitComponentVariants(Collections.emptyList());
        builder.endVisitComponent();
        ResolvedComponentResult root = builder.getRoot(0L);

        resolutionResultBuilder.startVisitComponent(component.getResultId(), component.getSelectionReason(), component.getRepositoryName());
        resolutionResultBuilder.visitComponentDetails(component.getComponentId(), component.getModuleVersion());
        for (ResolvedGraphVariant variant : component.getSelectedVariants()) {

        DummyModuleVersionSelection moduleVersion = comp(module, reason)
        builder.startVisitComponent(moduleVersion.resultId, moduleVersion.selectionReason, "repo")
        builder.visitComponentDetails(moduleVersion.componentId, moduleVersion.moduleVersion)
        builder.visitSelectedVariant(moduleVersion.resultId, Stub(ResolvedVariantResult))
        builder.visitComponentVariants([])