question: public int action ( String fault , String action ) { Integer current = get ( fault ) ; if ( current == null ) throw new IllegalArgumentException ( fault ) ; boolean no = action . startsWith ( "no" ) ; if ( no ) action = action . substring ( 2 ) ; Integer bit = getAction ( action ) ; if ( bit == null ) throw new IllegalArgumentException ( action ) ; int old = current . intValue ( ) ; int mask = bit . intValue ( ) ; int n = ( old & ( ~ mask ) ) ; n = ( no ) ? n : ( n | mask ) ; put ( fault , new Integer ( n ) ) ; return n ; }
target:  Sets the action bits as appropriate for the given fault  and action 