public Class<?> getColumnClass(int columnIndex) {
			switch(columnIndex) {
			case 0: return Integer.class;
			case 1: return String.class;
			case 2: return String.class;
			case 3: return Integer.class;
			case 4: return Boolean.class;
			case 5: return Boolean.class;
			case 6: return Boolean.class;
			default: return String.class;
			}
		}