public static FTPClient createConnection(String hostname, int port, char[] username, char[] password, String workingDirectory, FileSystemOptions fileSystemOptions) throws FileSystemException {
        if (username == null) {
            username = "anonymous".toCharArray();
        }
        if (password == null) {
            password = "anonymous".toCharArray();
        }
        try {
            final FTPClient client = new FTPClient();
            String key = FtpFileSystemConfigBuilder.getInstance().getEntryParser(fileSystemOptions);
            if (key != null) {
                FTPClientConfig config = new FTPClientConfig(key);
                String serverLanguageCode = FtpFileSystemConfigBuilder.getInstance().getServerLanguageCode(fileSystemOptions);
                if (serverLanguageCode != null) {
                    config.setServerLanguageCode(serverLanguageCode);
                }
                String defaultDateFormat = FtpFileSystemConfigBuilder.getInstance().getDefaultDateFormat(fileSystemOptions);
                if (defaultDateFormat != null) {
                    config.setDefaultDateFormatStr(defaultDateFormat);
                }
                String recentDateFormat = FtpFileSystemConfigBuilder.getInstance().getRecentDateFormat(fileSystemOptions);
                if (recentDateFormat != null) {
                    config.setRecentDateFormatStr(recentDateFormat);
                }
                String serverTimeZoneId = FtpFileSystemConfigBuilder.getInstance().getServerTimeZoneId(fileSystemOptions);
                if (serverTimeZoneId != null) {
                    config.setServerTimeZoneId(serverTimeZoneId);
                }
                String[] shortMonthNames = FtpFileSystemConfigBuilder.getInstance().getShortMonthNames(fileSystemOptions);
                if (shortMonthNames != null) {
                    StringBuffer shortMonthNamesStr = new StringBuffer(40);
                    for (int i = 0; i < shortMonthNames.length; i++) {
                        if (shortMonthNamesStr.length() > 0) {
                            shortMonthNamesStr.append("|");
                        }
                        shortMonthNamesStr.append(shortMonthNames[i]);
                    }
                    config.setShortMonthNames(shortMonthNamesStr.toString());
                }
                client.configure(config);
            }
            FTPFileEntryParserFactory myFactory = FtpFileSystemConfigBuilder.getInstance().getEntryParserFactory(fileSystemOptions);
            if (myFactory != null) {
                client.setParserFactory(myFactory);
            }
            try {
                client.connect(hostname, port);
                int reply = client.getReplyCode();
                if (!FTPReply.isPositiveCompletion(reply)) {
                    throw new FileSystemException("vfs.provider.ftp/connect-rejected.error", hostname);
                }
                if (!client.login(UserAuthenticatorUtils.toString(username), UserAuthenticatorUtils.toString(password))) {
                    throw new FileSystemException("vfs.provider.ftp/login.error", new Object[] { hostname, UserAuthenticatorUtils.toString(username) }, null);
                }
                if (!client.setFileType(FTP.BINARY_FILE_TYPE)) {
                    throw new FileSystemException("vfs.provider.ftp/set-binary.error", hostname);
                }
                Integer dataTimeout = FtpFileSystemConfigBuilder.getInstance().getDataTimeout(fileSystemOptions);
                if (dataTimeout != null) {
                    client.setDataTimeout(dataTimeout.intValue());
                }
                Boolean userDirIsRoot = FtpFileSystemConfigBuilder.getInstance().getUserDirIsRoot(fileSystemOptions);
                if (workingDirectory != null && (userDirIsRoot == null || !userDirIsRoot.booleanValue())) {
                    if (!client.changeWorkingDirectory(workingDirectory)) {
                        throw new FileSystemException("vfs.provider.ftp/change-work-directory.error", workingDirectory);
                    }
                }
                Boolean passiveMode = FtpFileSystemConfigBuilder.getInstance().getPassiveMode(fileSystemOptions);
                if (passiveMode != null && passiveMode.booleanValue()) {
                    client.enterLocalPassiveMode();
                }
            } catch (final IOException e) {
                if (client.isConnected()) {
                    client.disconnect();
                }
                throw e;
            }
            return client;
        } catch (final Exception exc) {
            throw new FileSystemException("vfs.provider.ftp/connect.error", new Object[] { hostname }, exc);
        }
    }