if (keys.length == 1)
if (keys.length <= 1)
	public void sort(String[] keys, Object[] values) {		if ((keys == null) || (values == null)) {			Assert.isTrue(false, "Either keys or values in null"); //$NON-NLS-1$			return;		}		if (keys.length == 1)			return;					internalSort(keys, values, 0, keys.length - 1);		}