code: @Override
  	public int compare(final ImportResource object, final ImportResource compareWithObject)
  	{
  		final Integer nullCheck = ComparatorExtensions.nullCheck(object, compareWithObject);
  		if (nullCheck != null)
  		{
  			return nullCheck;
  		}
  		return ComparatorExtensions.compare(object.index(), compareWithObject.index());
  	}
docs: {@inheritDoc}