/**
* Returns a socket of the data connection. Wrapped as an {@link SSLSocket}, which carries out
* handshake processing.
*
* @param command The int representation of the FTP command to send.
* @param arg The arguments to the FTP command. If this parameter is set to null, then the command
* is sent with no arguments.
* @return corresponding to the established data connection. Null is returned if an FTP protocol
* error is reported at any point during the establishment and initialization of the
* connection.
* @throws IOException If there is any problem with the connection.
* @see FTPClient#_openDataConnection_(int, String)
*/
@Override
// Strictly speaking this is not needed, but it works round a Clirr bug
// So rather than invoke the parent code, we do it here
protected Socket _openDataConnection_(int command, String arg) throws IOException {
return _openDataConnection_(FTPCommand.getCommand(command), arg);
}
