question: public boolean addSubAction ( final ConfAction actionConf ) throws GeneralException , ConfigurationException { if ( actionConf . getType ( ) != null ) { final SubAction sub = SubAction . factory ( actionConf . getType ( ) , actionConf ) ; if ( sub == null ) { if ( Cfg . DEBUG ) { Check . log ( TAG + " Error (addSubAction): unknown type: " + actionConf . getType ( ) ) ; } return false ; } list . add ( sub ) ; if ( sub instanceof SubActionSlow ) { setQueue ( MAIN_QUEUE ) ; } return true ; } else { if ( Cfg . DEBUG ) { Check . log ( TAG + " Error (addSubAction): null type " ) ; } return false ; } }
target:  Adds the sub action.