class PathAliasListBuilder

class PathAliasListBuilder extends EntityListBuilder {
  
  /**
   * The current request.
   *
   * @var \Symfony\Component\HttpFoundation\Request
   */
  protected $currentRequest;
  
  /**
   * The form builder.
   *
   * @var \Drupal\Core\Form\FormBuilderInterface
   */
  protected $formBuilder;
  
  /**
   * The language manager.
   *
   * @var \Drupal\Core\Language\LanguageManagerInterface
   */
  protected $languageManager;
  
  /**
   * The path alias manager.
   *
   * @var \Drupal\path_alias\AliasManagerInterface
   */
  protected $aliasManager;
  
  /**
   * Constructs a new PathAliasListBuilder object.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The entity type definition.
   * @param \Drupal\Core\Entity\EntityStorageInterface $storage
   *   The entity storage class.
   * @param \Symfony\Component\HttpFoundation\Request $current_request
   *   The current request.
   * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
   *   The form builder.
   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
   *   The language manager.
   * @param \Drupal\path_alias\AliasManagerInterface $alias_manager
   *   The path alias manager.
   */
  public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, Request $current_request, FormBuilderInterface $form_builder, LanguageManagerInterface $language_manager, AliasManagerInterface $alias_manager) {
    parent::__construct($entity_type, $storage);
    $this->currentRequest = $current_request;
    $this->formBuilder = $form_builder;
    $this->languageManager = $language_manager;
    $this->aliasManager = $alias_manager;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
    return new static($entity_type, $container->get('entity_type.manager')
      ->getStorage($entity_type->id()), $container->get('request_stack')
      ->getCurrentRequest(), $container->get('form_builder'), $container->get('language_manager'), $container->get('path_alias.manager'));
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getEntityIds() {
    $query = $this->getStorage()
      ->getQuery()
      ->accessCheck(TRUE);
    $search = $this->currentRequest->query
      ->get('search');
    if ($search) {
      $query->condition('alias', $search, 'CONTAINS');
    }
    // Only add the pager if a limit is specified.
    if ($this->limit) {
      $query->pager($this->limit);
    }
    // Allow the entity query to sort using the table header.
    $header = $this->buildHeader();
    $query->tableSort($header);
    return $query->execute();
  }
  
  /**
   * {@inheritdoc}
   */
  public function render() {
    $keys = $this->currentRequest->query
      ->get('search');
    $build['path_admin_filter_form'] = $this->formBuilder
      ->getForm(PathFilterForm::class, $keys);
    $build += parent::render();
    $build['table']['#empty'] = $this->t('No path aliases available. <a href=":link">Add URL alias</a>.', [
      ':link' => Url::fromRoute('entity.path_alias.add_form')->toString(),
    ]);
    return $build;
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildHeader() {
    $header = [
      'alias' => [
        'data' => $this->t('Alias'),
        'field' => 'alias',
        'specifier' => 'alias',
        'sort' => 'asc',
      ],
      'path' => [
        'data' => $this->t('System path'),
        'field' => 'path',
        'specifier' => 'path',
      ],
    ];
    // Enable language column and filter if multiple languages are added.
    if ($this->languageManager
      ->isMultilingual()) {
      $header['language_name'] = [
        'data' => $this->t('Language'),
        'field' => 'langcode',
        'specifier' => 'langcode',
        'class' => [
          RESPONSIVE_PRIORITY_MEDIUM,
        ],
      ];
    }
    return $header + parent::buildHeader();
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildRow(EntityInterface $entity) {
    /** @var \Drupal\Core\Path\Entity\PathAlias $entity */
    $langcode = $entity->language()
      ->getId();
    $alias = $entity->getAlias();
    $path = $entity->getPath();
    $url = Url::fromUserInput($path);
    $row['data']['alias']['data'] = [
      '#type' => 'link',
      '#title' => $alias,
      '#url' => $url,
    ];
    // Create a new URL for linking to the un-aliased system path.
    $system_url = Url::fromUri("base:{$path}");
    $row['data']['path']['data'] = [
      '#type' => 'link',
      '#title' => $path,
      '#url' => $system_url,
    ];
    if ($this->languageManager
      ->isMultilingual()) {
      $row['data']['language_name'] = $this->languageManager
        ->getLanguageName($langcode);
    }
    $row['data']['operations']['data'] = $this->buildOperations($entity);
    // If the system path maps to a different URL alias, highlight this table
    // row to let the user know of old aliases.
    if ($alias != $this->aliasManager
      ->getAliasByPath($path, $langcode)) {
      $row['class'] = [
        'warning',
      ];
    }
    return $row;
  }

}