@Override
        public Class<?> getColumnClass( int column ) {
                switch( column ){
                    case 0: return Integer.class;
                    case 3: return Integer.class;
                    case 6: return Integer.class;
                    case 9: return Integer.class;
                    case 15: return Object.class;
                    case 16: return Object.class;
                    default: return String.class;
                }
        }