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;
    }

}