/// <summary>
/// Returns a MemberwiseClone of this object
/// with the guarantee that the tail argument
/// will be the last tokenizer in the new
/// tokenizer chain.
/// </summary>
/// <param name="tail">the last tokenizer for the
/// new chain</param>
/// <returns>cloned chain with tail as the
/// last tokenizer in the chain</returns>
public ITokenizer Clone(ITokenizer tail)
{
AbstractFilter clone = MemberwiseClone() as AbstractFilter;
if (null == _previous)
{
clone._previous = tail;
}
else
{
clone._previous = _previous.Clone(tail);
}
return(clone);
}