/** * Factory method for getting an instance of importer builder (singleton) * * @return Tx_Yag_Domain_Import_ImporterBuilder Singleton instance of importer builder */ public static function getInstance() { if (self::$instance === NULL) { $configurationBuilder = Tx_Yag_Domain_Configuration_ConfigurationBuilderFactory::getInstance(); self::$instance = new self($configurationBuilder); } return self::$instance; }