This class is used to parse the information of a returned String from the 'LIST' command.
It parse the following information from the list:
1) Name
2) Permission
3) Type
4) Owner
5) Group
6) Size
The class that implement this interface have the ability to monitor the progress
of upload and download files in the FtpBean.
You can pass the object which implement this interface to some put/get methods
of the FtpBean object.