MigrateEntityRevision.php

<?php

namespace Drupal\migrate\Plugin\Derivative;

use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
class MigrateEntityRevision implements ContainerDeriverInterface {
    
    /**
     * List of derivative definitions.
     *
     * @var array
     */
    protected $derivatives = [];
    
    /**
     * The entity definitions.
     *
     * @var \Drupal\Core\Entity\EntityTypeInterface[]
     */
    protected $entityDefinitions;
    
    /**
     * Constructs a MigrateEntity object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface[] $entity_definitions
     *   A list of entity definition objects.
     */
    public function __construct(array $entity_definitions) {
        $this->entityDefinitions = $entity_definitions;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, $base_plugin_id) {
        return new static($container->get('entity_type.manager')
            ->getDefinitions());
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinition($derivative_id, $base_plugin_definition) {
        if (!empty($this->derivatives) && !empty($this->derivatives[$derivative_id])) {
            return $this->derivatives[$derivative_id];
        }
        $this->getDerivativeDefinitions($base_plugin_definition);
        return $this->derivatives[$derivative_id];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        foreach ($this->entityDefinitions as $entity_type => $entity_info) {
            if ($entity_info->getKey('revision')) {
                $this->derivatives[$entity_type] = [
                    'id' => "entity_revision:{$entity_type}",
                    'class' => 'Drupal\\migrate\\Plugin\\migrate\\destination\\EntityRevision',
                    'requirements_met' => 1,
                    'provider' => $entity_info->getProvider(),
                ];
            }
        }
        return $this->derivatives;
    }

}