Most FTP API's that I've used in the past had the isDirectory(), isLink(), AND the isFile() methods.  I see the first two, but not the third.
Can I make this assumption with this new method?:
public boolean isFile(FTPFile ftpFile)
{
  if( ftpFile.isDir() || ftpFile.isLink())
    return false;
  else
    return true;
}