class MigrateSource

class MigrateSource extends Plugin implements MultipleProviderAttributeInterface {
  
  /**
   * The providers of the source plugin.
   */
  protected array $providers = [];
  
  /**
   * Constructs a migrate source plugin attribute object.
   *
   * @param string $id
   *   A unique identifier for the source plugin.
   * @param bool $requirements_met
   *   (optional) Whether requirements are met. Defaults to true. The source
   *   plugin itself determines how the value is used. For example, Migrate
   *   Drupal's source plugins expect source_module to be the name of a module
   *   that must be installed and enabled in the source database.
   * @param mixed $minimum_version
   *   (optional) Specifies the minimum version of the source provider. This can
   *   be any type, and the source plugin itself determines how it is used. For
   *   example, Migrate Drupal's source plugins expect this to be an integer
   *   representing the minimum installed database schema version of the module
   *   specified by source_module.
   * @param class-string|null $deriver
   *   (optional) The deriver class.
   *
   * @see \Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase::checkRequirements
   */
  public function __construct(public readonly string $id, public bool $requirements_met = TRUE, public readonly mixed $minimum_version = NULL, public readonly ?string $deriver = NULL) {
  }
  
  /**
   * {@inheritdoc}
   */
  public function setProvider(string $provider) : void {
    $this->setProviders([
      $provider,
    ]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function getProviders() : array {
    return $this->providers;
  }
  
  /**
   * {@inheritdoc}
   */
  public function setProviders(array $providers) : void {
    if ($providers) {
      parent::setProvider(reset($providers));
    }
    else {
      $this->provider = NULL;
    }
    $this->providers = $providers;
  }

}