case T_YEAR : return numCompare(ms1.getYear(), ms2.getYear());
 	public int compare(Object o1, Object o2) 	{ 		MechSummary ms1 = (MechSummary)o1; 		MechSummary ms2 = (MechSummary)o2; 		 		switch (m_nType) { 			case T_NAME : 				return ms1.getName().compareTo(ms2.getName()); 			case T_REF :	 			return ms1.getRef().compareTo(ms2.getRef());	 		case T_WEIGHT : 				return numCompare(ms1.getTons(), ms2.getTons()); 			case T_BV : 				return numCompare(ms1.getBV(), ms2.getBV()); 			default : 				return 0; 		} 	}