class WorkspaceSwitcherBlock

class WorkspaceSwitcherBlock extends BlockBase implements ContainerFactoryPluginInterface {
  
  /**
   * The form builder.
   *
   * @var \Drupal\Core\Form\FormBuilderInterface
   */
  protected $formBuilder;
  
  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;
  
  /**
   * Constructs a new WorkspaceSwitcherBlock instance.
   *
   * @param array $configuration
   *   The plugin configuration.
   * @param string $plugin_id
   *   The plugin ID.
   * @param mixed $plugin_definition
   *   The plugin definition.
   * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
   *   The form builder.
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, FormBuilderInterface $form_builder, EntityTypeManagerInterface $entity_type_manager) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->formBuilder = $form_builder;
    $this->entityTypeManager = $entity_type_manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container->get('form_builder'), $container->get('entity_type.manager'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function build() {
    $build = [
      'form' => $this->formBuilder
        ->getForm(WorkspaceSwitcherForm::class),
      '#cache' => [
        'contexts' => $this->entityTypeManager
          ->getDefinition('workspace')
          ->getListCacheContexts(),
        'tags' => $this->entityTypeManager
          ->getDefinition('workspace')
          ->getListCacheTags(),
      ],
    ];
    return $build;
  }
  
  /**
   * {@inheritdoc}
   */
  protected function blockAccess(AccountInterface $account) : AccessResultInterface {
    return AccessResult::allowedIfHasPermissions($account, [
      'view own workspace',
      'view any workspace',
      'administer workspaces',
    ], 'OR');
  }

}