class MediaListBuilder

class MediaListBuilder extends EntityListBuilder {
    
    /**
     * The date formatter service.
     *
     * @var \Drupal\Core\Datetime\DateFormatterInterface
     */
    protected $dateFormatter;
    
    /**
     * The language manager service.
     *
     * @var \Drupal\Core\Language\LanguageManagerInterface
     */
    protected $languageManager;
    
    /**
     * Indicates whether the 'thumbnail' image style exists.
     *
     * @var bool
     */
    protected $thumbnailStyleExists = FALSE;
    
    /**
     * Constructs a new MediaListBuilder object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The entity storage class.
     * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
     *   The date formatter service.
     * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
     *   The language manager service.
     * @param \Drupal\Core\Entity\EntityStorageInterface $image_style_storage
     *   The entity storage class for image styles.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, DateFormatterInterface $date_formatter, LanguageManagerInterface $language_manager, EntityStorageInterface $image_style_storage) {
        parent::__construct($entity_type, $storage);
        $this->dateFormatter = $date_formatter;
        $this->languageManager = $language_manager;
        $this->thumbnailStyleExists = !empty($image_style_storage->load('thumbnail'));
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        $entity_type_manager = $container->get('entity_type.manager');
        return new static($entity_type, $entity_type_manager->getStorage($entity_type->id()), $container->get('date.formatter'), $container->get('language_manager'), $entity_type_manager->getStorage('image_style'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header = [];
        if ($this->thumbnailStyleExists) {
            $header['thumbnail'] = [
                'data' => $this->t('Thumbnail'),
                'class' => [
                    RESPONSIVE_PRIORITY_LOW,
                ],
            ];
        }
        $header += [
            'name' => $this->t('Media Name'),
            'type' => [
                'data' => $this->t('Type'),
                'class' => [
                    RESPONSIVE_PRIORITY_MEDIUM,
                ],
            ],
            'author' => [
                'data' => $this->t('Author'),
                'class' => [
                    RESPONSIVE_PRIORITY_LOW,
                ],
            ],
            'status' => $this->t('Status'),
            'changed' => [
                'data' => $this->t('Updated'),
                'class' => [
                    RESPONSIVE_PRIORITY_LOW,
                ],
            ],
        ];
        // Enable language column if multiple languages are added.
        if ($this->languageManager
            ->isMultilingual()) {
            $header['language'] = [
                'data' => $this->t('Language'),
                'class' => [
                    RESPONSIVE_PRIORITY_LOW,
                ],
            ];
        }
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        
        /** @var \Drupal\media\MediaInterface $entity */
        if ($this->thumbnailStyleExists) {
            $row['thumbnail'] = [];
            if ($thumbnail_uri = $entity->getSource()
                ->getMetadata($entity, 'thumbnail_uri')) {
                $row['thumbnail']['data'] = [
                    '#theme' => 'image_style',
                    '#style_name' => 'thumbnail',
                    '#uri' => $thumbnail_uri,
                    '#height' => 50,
                ];
            }
        }
        $row['name']['data'] = [
            '#type' => 'link',
            '#title' => $entity->label(),
            '#url' => $entity->toUrl(),
        ];
        $row['type'] = $entity->bundle->entity
            ->label();
        $row['author']['data'] = [
            '#theme' => 'username',
            '#account' => $entity->getOwner(),
        ];
        $row['status'] = $entity->isPublished() ? $this->t('Published') : $this->t('Unpublished');
        $row['changed'] = $this->dateFormatter
            ->format($entity->getChangedTime(), 'short');
        if ($this->languageManager
            ->isMultilingual()) {
            $row['language'] = $this->languageManager
                ->getLanguageName($entity->language()
                ->getId());
        }
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEntityIds() {
        $query = $this->getStorage()
            ->getQuery()
            ->accessCheck(TRUE)
            ->sort('changed', 'DESC');
        // Only add the pager if a limit is specified.
        if ($this->limit) {
            $query->pager($this->limit);
        }
        return $query->execute();
    }

}