// call appropriate command method
String optsRequest = "OPTS_" + argument;
Command command = (Command) COMMAND_MAP.get(optsRequest);
try {
if (command != null) {
command.execute(session, context, request);
} else {
session.resetState();
session.write(FtpReplyUtil.translate(session, request, context,
FtpReply.REPLY_502_COMMAND_NOT_IMPLEMENTED,
"OPTS.not.implemented", argument));