[logback-user] how to get all configured appenders over api

hello I need for a dynamic configuration of a logger, the list of all configured appenders (e.g all FileAppender) even if some appenders are initially not attached to any loggers ch.qos.logback.classic.Logger log = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger("de.foo" ); log.setLevel( Level.DEBUG ); log.setAdditive( false ); log.addAppender( ????? ) how can I get this list of appenders over the logback api? Regards Ralph