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 string|null $source_module
     *   (optional) Identifies the system providing the data the source plugin
     *   will read. 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 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(string $id, ?string $source_module = NULL, bool $requirements_met = TRUE, mixed $minimum_version = NULL, ?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;
    }

}