/** * Short description of method singleton * * @access public * @author Cédric Alfonsi, <*****@*****.**> * @return core_kernel_versioning_RepositoryProxy */ public static function singleton() { $returnValue = null; if (is_null(self::$instance)) { self::$instance = new core_kernel_versioning_RepositoryProxy(); } $returnValue = self::$instance; return $returnValue; }