public String toString() {

		String strType;

		switch (type) {

			case _AVERAGE:
				strType = STR_AVERAGE;
				break;

			case _MIN:
				strType = STR_MIN;
				break;

			case _MAX:
				strType = STR_MAX;
				break;

			case _LAST:
				strType = STR_LAST;
				break;

			default :
				throw new RuntimeException("This should never happen");
		}

		return strType;
	}