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<?php
/**
 * @file
 * Contains \Drupal\system\Plugin\Block\SystemBreadcrumbBlock.
 */
namespace Drupal\system\Plugin\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
/**
 * Provides a block to display the breadcrumbs.
 *
 * @Block(
 *   id = "system_breadcrumb_block",
 *   admin_label = @Translation("Breadcrumbs")
 * )
 */
class SystemBreadcrumbBlock extends BlockBase implements ContainerFactoryPluginInterface {
  /**
   * The breadcrumb manager.
   *
   * @var \Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface
   */
  protected $breadcrumbManager;
  /**
   * The current route match.
   *
   * @var \Drupal\Core\Routing\RouteMatchInterface
   */
  protected $routeMatch;
  /**
   * Constructs a new SystemBreadcrumbBlock object.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface $breadcrumb_manager
   *   The breadcrumb manager.
   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
   *   The current route match.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, BreadcrumbBuilderInterface $breadcrumb_manager, RouteMatchInterface $route_match) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->breadcrumbManager = $breadcrumb_manager;
    $this->routeMatch = $route_match;
  }
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('breadcrumb'),
      $container->get('current_route_match')
    );
  }
  /**
   * {@inheritdoc}
   */
  public function build() {
    return $this->breadcrumbManager->build($this->routeMatch)->toRenderable();
  }
}