@Override
    public boolean isMine(String command) {
        if (super.isMine(command)) {
            if ((command.indexOf("[") == -1) || (command.indexOf("]") == -1)) {
                error = hint;
                return false;
            }
            jsonStr = command.substring(command.indexOf("["), command.lastIndexOf("]") + 1);
            return true;
        }
        return false;
    }