class EntityContentBase

class EntityContentBase extends Entity implements HighestIdInterface, MigrateValidatableEntityInterface {
    
    /**
     * Field type plugin manager.
     *
     * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
     */
    protected $fieldTypeManager;
    
    /**
     * The account switcher service.
     *
     * @var \Drupal\Core\Session\AccountSwitcherInterface
     */
    protected $accountSwitcher;
    
    /**
     * Constructs a content entity.
     *
     * @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\migrate\Plugin\MigrationInterface $migration
     *   The migration entity.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The storage for this entity type.
     * @param array $bundles
     *   The list of bundles this entity type has.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager.
     * @param \Drupal\Core\Field\FieldTypePluginManagerInterface $field_type_manager
     *   The field type plugin manager service.
     * @param \Drupal\Core\Session\AccountSwitcherInterface $account_switcher
     *   The account switcher service.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityStorageInterface $storage, array $bundles, EntityFieldManagerInterface $entity_field_manager, FieldTypePluginManagerInterface $field_type_manager, AccountSwitcherInterface $account_switcher = NULL) {
        parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $storage, $bundles);
        $this->entityFieldManager = $entity_field_manager;
        $this->fieldTypeManager = $field_type_manager;
        if ($account_switcher === NULL) {
            @trigger_error('Calling ' . __NAMESPACE__ . '\\EntityContentBase::__construct() without the $account_switcher argument is deprecated in drupal:9.3.0 and will be required in drupal:10.0.0. See https://www.drupal.org/node/3142975', E_USER_DEPRECATED);
            $account_switcher = \Drupal::service('account_switcher');
        }
        $this->accountSwitcher = $account_switcher;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
        $entity_type = static::getEntityTypeId($plugin_id);
        return new static($configuration, $plugin_id, $plugin_definition, $migration, $container->get('entity_type.manager')
            ->getStorage($entity_type), array_keys($container->get('entity_type.bundle.info')
            ->getBundleInfo($entity_type)), $container->get('entity_field.manager'), $container->get('plugin.manager.field.field_type'), $container->get('account_switcher'));
    }
    
    /**
     * {@inheritdoc}
     *
     * @throws \Drupal\migrate\MigrateException
     *   When an entity cannot be looked up.
     * @throws \Drupal\migrate\Exception\EntityValidationException
     *   When an entity validation hasn't been passed.
     */
    public function import(Row $row, array $old_destination_id_values = []) {
        $this->rollbackAction = MigrateIdMapInterface::ROLLBACK_DELETE;
        $entity = $this->getEntity($row, $old_destination_id_values);
        if (!$entity) {
            throw new MigrateException('Unable to get entity');
        }
        assert($entity instanceof ContentEntityInterface);
        if ($this->isEntityValidationRequired($entity)) {
            $this->validateEntity($entity);
        }
        $ids = $this->save($entity, $old_destination_id_values);
        if ($this->isTranslationDestination()) {
            $ids[] = $entity->language()
                ->getId();
        }
        return $ids;
    }
    
    /**
     * {@inheritdoc}
     */
    public function isEntityValidationRequired(FieldableEntityInterface $entity) {
        // Prioritize the entity method over migration config because it won't be
        // possible to save that entity unvalidated.
        
        /* @see \Drupal\Core\Entity\ContentEntityBase::preSave() */
        return $entity->isValidationRequired() || !empty($this->configuration['validate']);
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateEntity(FieldableEntityInterface $entity) {
        // Entity validation can require the user that owns the entity. Switch to
        // use that user during validation.
        // As an example:
        // @see \Drupal\Core\Entity\Plugin\Validation\Constraint\ValidReferenceConstraint
        $account = $entity instanceof EntityOwnerInterface ? $entity->getOwner() : NULL;
        // Validate account exists as the owner reference could be invalid for any
        // number of reasons.
        if ($account) {
            $this->accountSwitcher
                ->switchTo($account);
        }
        // This finally block ensures that the account is always switched back, even
        // if an exception was thrown. Any validation exceptions are intentionally
        // left unhandled. They should be caught and logged by a catch block
        // surrounding the row import and then added to the migration messages table
        // for the current row.
        try {
            $violations = $entity->validate();
        } finally {
            if ($account) {
                $this->accountSwitcher
                    ->switchBack();
            }
        }
        if (count($violations) > 0) {
            throw new EntityValidationException($violations);
        }
    }
    
    /**
     * Saves the entity.
     *
     * @param \Drupal\Core\Entity\ContentEntityInterface $entity
     *   The content entity.
     * @param array $old_destination_id_values
     *   (optional) An array of destination ID values. Defaults to an empty array.
     *
     * @return array
     *   An array containing the entity ID.
     */
    protected function save(ContentEntityInterface $entity, array $old_destination_id_values = []) {
        $entity->save();
        return [
            $entity->id(),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function isTranslationDestination() {
        return !empty($this->configuration['translations']);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids = [];
        $id_key = $this->getKey('id');
        $ids[$id_key] = $this->getDefinitionFromEntity($id_key);
        if ($this->isTranslationDestination()) {
            $langcode_key = $this->getKey('langcode');
            if (!$langcode_key) {
                throw new MigrateException(sprintf('The "%s" entity type does not support translations.', $this->storage
                    ->getEntityTypeId()));
            }
            $ids[$langcode_key] = $this->getDefinitionFromEntity($langcode_key);
        }
        return $ids;
    }
    
    /**
     * Updates an entity with the new values from row.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity to update.
     * @param \Drupal\migrate\Row $row
     *   The row object to update from.
     *
     * @return \Drupal\Core\Entity\EntityInterface
     *   An updated entity from row values.
     */
    protected function updateEntity(EntityInterface $entity, Row $row) {
        $empty_destinations = $row->getEmptyDestinationProperties();
        // By default, an update will be preserved.
        $rollback_action = MigrateIdMapInterface::ROLLBACK_PRESERVE;
        // Make sure we have the right translation.
        if ($this->isTranslationDestination()) {
            $property = $this->storage
                ->getEntityType()
                ->getKey('langcode');
            if ($row->hasDestinationProperty($property)) {
                $language = $row->getDestinationProperty($property);
                if (!$entity->hasTranslation($language)) {
                    $entity->addTranslation($language);
                    // We're adding a translation, so delete it on rollback.
                    $rollback_action = MigrateIdMapInterface::ROLLBACK_DELETE;
                }
                $entity = $entity->getTranslation($language);
            }
        }
        // If the migration has specified a list of properties to be overwritten,
        // clone the row with an empty set of destination values, and re-add only
        // the specified properties.
        if (isset($this->configuration['overwrite_properties'])) {
            $empty_destinations = array_intersect($empty_destinations, $this->configuration['overwrite_properties']);
            $clone = $row->cloneWithoutDestination();
            foreach ($this->configuration['overwrite_properties'] as $property) {
                $clone->setDestinationProperty($property, $row->getDestinationProperty($property));
            }
            $row = $clone;
        }
        foreach ($row->getDestination() as $field_name => $values) {
            $field = $entity->{$field_name};
            if ($field instanceof TypedDataInterface) {
                $field->setValue($values);
            }
        }
        foreach ($empty_destinations as $field_name) {
            $entity->{$field_name} = NULL;
        }
        $this->setRollbackAction($row->getIdMap(), $rollback_action);
        // We might have a different (translated) entity, so return it.
        return $entity;
    }
    
    /**
     * Populates as much of the stub row as possible.
     *
     * @param \Drupal\migrate\Row $row
     *   The row of data.
     */
    protected function processStubRow(Row $row) {
        $bundle_key = $this->getKey('bundle');
        if ($bundle_key && empty($row->getDestinationProperty($bundle_key))) {
            if (empty($this->bundles)) {
                throw new MigrateException('Stubbing failed, no bundles available for entity type: ' . $this->storage
                    ->getEntityTypeId());
            }
            $row->setDestinationProperty($bundle_key, reset($this->bundles));
        }
        $bundle = $row->getDestinationProperty($bundle_key) ?? $this->storage
            ->getEntityTypeId();
        // Populate any required fields not already populated.
        $fields = $this->entityFieldManager
            ->getFieldDefinitions($this->storage
            ->getEntityTypeId(), $bundle);
        foreach ($fields as $field_name => $field_definition) {
            if ($field_definition->isRequired() && is_null($row->getDestinationProperty($field_name))) {
                // Use the configured default value for this specific field, if any.
                if ($default_value = $field_definition->getDefaultValueLiteral()) {
                    $values = $default_value;
                }
                else {
                    
                    /** @var \Drupal\Core\Field\FieldItemInterface $field_type_class */
                    $field_type_class = $this->fieldTypeManager
                        ->getPluginClass($field_definition->getType());
                    $values = $field_type_class::generateSampleValue($field_definition);
                    if (is_null($values)) {
                        // Handle failure to generate a sample value.
                        throw new MigrateException('Stubbing failed, unable to generate value for field ' . $field_name);
                    }
                }
                $row->setDestinationProperty($field_name, $values);
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function rollback(array $destination_identifier) {
        if ($this->isTranslationDestination()) {
            // Attempt to remove the translation.
            $entity = $this->storage
                ->load(reset($destination_identifier));
            if ($entity && $entity instanceof TranslatableInterface) {
                if ($key = $this->getKey('langcode')) {
                    if (isset($destination_identifier[$key])) {
                        $langcode = $destination_identifier[$key];
                        if ($entity->hasTranslation($langcode)) {
                            // Make sure we don't remove the default translation.
                            $translation = $entity->getTranslation($langcode);
                            if (!$translation->isDefaultTranslation()) {
                                $entity->removeTranslation($langcode);
                                $entity->save();
                            }
                        }
                    }
                }
            }
        }
        else {
            parent::rollback($destination_identifier);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getHighestId() {
        $values = $this->storage
            ->getQuery()
            ->accessCheck(FALSE)
            ->sort($this->getKey('id'), 'DESC')
            ->range(0, 1)
            ->execute();
        return (int) current($values);
    }

}