class ConfigTranslationFieldListBuilder

class ConfigTranslationFieldListBuilder extends ConfigTranslationEntityListBuilder {
    
    /**
     * The name of the entity type the fields are attached to.
     *
     * @var string
     */
    protected $baseEntityType = '';
    
    /**
     * An array containing the base entity type's definition.
     *
     * @var \Drupal\Core\Entity\EntityTypeInterface
     */
    protected $baseEntityInfo;
    
    /**
     * The bundle info for the base entity type.
     *
     * @var array
     */
    protected $baseEntityBundles = [];
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The entity bundle info.
     *
     * @var \Drupal\Core\Entity\EntityTypeBundleInfoInterface
     */
    protected $entityTypeBundleInfo;
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        $entity_type_manager = $container->get('entity_type.manager');
        $entity_type_bundle_info = $container->get('entity_type.bundle.info');
        return new static($entity_type, $entity_type_manager->getStorage($entity_type->id()), $entity_type_manager, $entity_type_bundle_info);
    }
    
    /**
     * Constructs a new ConfigTranslationFieldListBuilder 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\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
     *   The entity type bundle info.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, EntityTypeManagerInterface $entity_type_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info) {
        parent::__construct($entity_type, $storage);
        $this->entityTypeManager = $entity_type_manager;
        $this->entityTypeBundleInfo = $entity_type_bundle_info;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setMapperDefinition($mapper_definition) {
        $this->baseEntityType = $mapper_definition['base_entity_type'];
        $this->baseEntityInfo = $this->entityTypeManager
            ->getDefinition($this->baseEntityType);
        $this->baseEntityBundles = $this->entityTypeBundleInfo
            ->getBundleInfo($this->baseEntityType);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function load() {
        // It is not possible to use the standard load method, because this needs
        // all field entities only for the given baseEntityType.
        $ids = \Drupal::entityQuery('field_config')->condition('id', $this->baseEntityType . '.', 'STARTS_WITH')
            ->execute();
        return $this->storage
            ->loadMultiple($ids);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFilterLabels() {
        $info = parent::getFilterLabels();
        $bundle = $this->baseEntityInfo
            ->getBundleLabel() ?: $this->t('Bundle');
        $bundle = mb_strtolower($bundle);
        $info['placeholder'] = $this->t('Enter field or @bundle', [
            '@bundle' => $bundle,
        ]);
        $info['description'] = $this->t('Enter a part of the field or @bundle to filter by.', [
            '@bundle' => $bundle,
        ]);
        return $info;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $row['label'] = [
            'data' => $entity->label(),
            'class' => 'table-filter-text-source',
        ];
        if ($this->displayBundle()) {
            $bundle = $entity->get('bundle');
            $row['bundle'] = [
                'data' => $this->baseEntityBundles[$bundle]['label'],
                'class' => 'table-filter-text-source',
            ];
        }
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['label'] = $this->t('Field');
        if ($this->displayBundle()) {
            $header['bundle'] = $this->baseEntityInfo
                ->getBundleLabel() ?: $this->t('Bundle');
        }
        return $header + parent::buildHeader();
    }
    
    /**
     * Controls the visibility of the bundle column on field list pages.
     *
     * @return bool
     *   Whenever the bundle is displayed or not.
     */
    public function displayBundle() {
        // The bundle key is explicitly defined in the entity definition.
        if ($this->baseEntityInfo
            ->getKey('bundle')) {
            return TRUE;
        }
        // There is more than one bundle defined.
        if (count($this->baseEntityBundles) > 1) {
            return TRUE;
        }
        // The defined bundle ones not match the entity type name.
        if (!empty($this->baseEntityBundles) && !isset($this->baseEntityBundles[$this->baseEntityType])) {
            return TRUE;
        }
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function sortRows($a, $b) {
        return $this->sortRowsMultiple($a, $b, [
            'bundle',
            'label',
        ]);
    }

}