Example usage for java.io StringWriter StringWriter

List of usage examples for java.io StringWriter StringWriter

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Introduction

In this page you can find the example usage for java.io StringWriter StringWriter.

Prototype

public StringWriter()

Source Link

Document

Create a new string writer using the default initial string-buffer size.

Usage

From source file:org.apache.flink.benchmark.Runner.java

public static void main(String[] args) throws Exception {
    final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
    env.getConfig().enableObjectReuse();
    env.getConfig().disableSysoutLogging();

    ParameterTool parameters = ParameterTool.fromArgs(args);

    if (!(parameters.has("p") && parameters.has("types") && parameters.has("algorithms"))) {
        printUsage();//from www .ja v  a2s. co m
        System.exit(-1);
    }

    int parallelism = parameters.getInt("p");
    env.setParallelism(parallelism);

    Set<IdType> types = new HashSet<>();

    if (parameters.get("types").equals("all")) {
        types.add(IdType.INT);
        types.add(IdType.LONG);
        types.add(IdType.STRING);
    } else {
        for (String type : parameters.get("types").split(",")) {
            if (type.toLowerCase().equals("int")) {
                types.add(IdType.INT);
            } else if (type.toLowerCase().equals("long")) {
                types.add(IdType.LONG);
            } else if (type.toLowerCase().equals("string")) {
                types.add(IdType.STRING);
            } else {
                printUsage();
                throw new RuntimeException("Unknown type: " + type);
            }
        }
    }

    Queue<RunnerWithScore> queue = new PriorityQueue<>();

    if (parameters.get("algorithms").equals("all")) {
        for (Map.Entry<String, Class> entry : AVAILABLE_ALGORITHMS.entrySet()) {
            for (IdType type : types) {
                AlgorithmRunner runner = (AlgorithmRunner) entry.getValue().newInstance();
                runner.initialize(type, SAMPLES, parallelism);
                runner.warmup(env);
                queue.add(new RunnerWithScore(runner, 1.0));
            }
        }
    } else {
        for (String algorithm : parameters.get("algorithms").split(",")) {
            double ratio = 1.0;
            if (algorithm.contains("=")) {
                String[] split = algorithm.split("=");
                algorithm = split[0];
                ratio = Double.parseDouble(split[1]);
            }

            if (AVAILABLE_ALGORITHMS.containsKey(algorithm.toLowerCase())) {
                Class clazz = AVAILABLE_ALGORITHMS.get(algorithm.toLowerCase());

                for (IdType type : types) {
                    AlgorithmRunner runner = (AlgorithmRunner) clazz.newInstance();
                    runner.initialize(type, SAMPLES, parallelism);
                    runner.warmup(env);
                    queue.add(new RunnerWithScore(runner, ratio));
                }
            } else {
                printUsage();
                throw new RuntimeException("Unknown algorithm: " + algorithm);
            }
        }
    }

    JsonFactory factory = new JsonFactory();

    while (queue.size() > 0) {
        RunnerWithScore current = queue.poll();
        AlgorithmRunner runner = current.getRunner();

        StringWriter writer = new StringWriter();
        JsonGenerator gen = factory.createGenerator(writer);
        gen.writeStartObject();
        gen.writeStringField("algorithm", runner.getClass().getSimpleName());

        boolean running = true;

        while (running) {
            try {
                runner.run(env, gen);
                running = false;
            } catch (ProgramInvocationException e) {
                // only suppress job cancellations
                if (!(e.getCause() instanceof JobCancellationException)) {
                    throw e;
                }
            }
        }

        JobExecutionResult result = env.getLastJobExecutionResult();

        long runtime_ms = result.getNetRuntime();
        gen.writeNumberField("runtime_ms", runtime_ms);
        current.credit(runtime_ms);

        if (!runner.finished()) {
            queue.add(current);
        }

        gen.writeObjectFieldStart("accumulators");
        for (Map.Entry<String, Object> accumulatorResult : result.getAllAccumulatorResults().entrySet()) {
            gen.writeStringField(accumulatorResult.getKey(), accumulatorResult.getValue().toString());
        }
        gen.writeEndObject();

        gen.writeEndObject();
        gen.close();
        System.out.println(writer.toString());
    }
}

From source file:gobblin.runtime.util.JobStateToJsonConverter.java

@SuppressWarnings("all")
public static void main(String[] args) throws Exception {
    Option sysConfigOption = Option.builder("sc").argName("system configuration file")
            .desc("Gobblin system configuration file").longOpt("sysconfig").hasArgs().build();
    Option storeUrlOption = Option.builder("u").argName("gobblin state store URL")
            .desc("Gobblin state store root path URL").longOpt("storeurl").hasArgs().required().build();
    Option jobNameOption = Option.builder("n").argName("gobblin job name").desc("Gobblin job name")
            .longOpt("name").hasArgs().required().build();
    Option jobIdOption = Option.builder("i").argName("gobblin job id").desc("Gobblin job id").longOpt("id")
            .hasArgs().build();/*from   www  .jav a  2  s.  c  o  m*/
    Option convertAllOption = Option.builder("a")
            .desc("Whether to convert all past job states of the given job").longOpt("all").build();
    Option keepConfigOption = Option.builder("kc").desc("Whether to keep all configuration properties")
            .longOpt("keepConfig").build();
    Option outputToFile = Option.builder("t").argName("output file name").desc("Output file name")
            .longOpt("toFile").hasArgs().build();

    Options options = new Options();
    options.addOption(sysConfigOption);
    options.addOption(storeUrlOption);
    options.addOption(jobNameOption);
    options.addOption(jobIdOption);
    options.addOption(convertAllOption);
    options.addOption(keepConfigOption);
    options.addOption(outputToFile);

    CommandLine cmd = null;
    try {
        CommandLineParser parser = new DefaultParser();
        cmd = parser.parse(options, args);
    } catch (ParseException pe) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("JobStateToJsonConverter", options);
        System.exit(1);
    }

    Properties sysConfig = new Properties();
    if (cmd.hasOption(sysConfigOption.getLongOpt())) {
        sysConfig = JobConfigurationUtils.fileToProperties(cmd.getOptionValue(sysConfigOption.getLongOpt()));
    }

    JobStateToJsonConverter converter = new JobStateToJsonConverter(sysConfig, cmd.getOptionValue('u'),
            cmd.hasOption("kc"));
    StringWriter stringWriter = new StringWriter();
    if (cmd.hasOption('i')) {
        converter.convert(cmd.getOptionValue('n'), cmd.getOptionValue('i'), stringWriter);
    } else {
        if (cmd.hasOption('a')) {
            converter.convertAll(cmd.getOptionValue('n'), stringWriter);
        } else {
            converter.convert(cmd.getOptionValue('n'), stringWriter);
        }
    }

    if (cmd.hasOption('t')) {
        Closer closer = Closer.create();
        try {
            FileOutputStream fileOutputStream = closer.register(new FileOutputStream(cmd.getOptionValue('t')));
            OutputStreamWriter outputStreamWriter = closer.register(
                    new OutputStreamWriter(fileOutputStream, ConfigurationKeys.DEFAULT_CHARSET_ENCODING));
            BufferedWriter bufferedWriter = closer.register(new BufferedWriter(outputStreamWriter));
            bufferedWriter.write(stringWriter.toString());
        } catch (Throwable t) {
            throw closer.rethrow(t);
        } finally {
            closer.close();
        }
    } else {
        System.out.println(stringWriter.toString());
    }
}

From source file:com.sludev.mssqlapplylog.MSSQLApplyLogMain.java

public static void main(String[] args) {
    CommandLineParser parser = new DefaultParser();
    Options options = new Options();

    // Most of the following defaults should be changed in
    // the --conf or "conf.properties" file
    String sqlURL = null;//from   w ww.  j ava2  s.  c  o  m
    String sqlUser = null;
    String sqlPass = null;
    String sqlDb = null;
    String sqlHost = "127.0.0.1";
    String backupDirStr = null;
    String laterThanStr = "";
    String fullBackupPathStr = null;
    String fullBackupPatternStr = "(?:[\\w_-]+?)(\\d+)\\.bak";
    String fullBackupDatePatternStr = "yyyyMMddHHmm";
    String sqlProcessUser = null;
    String logBackupPatternStr = "(.*)\\.trn";
    String logBackupDatePatternStr = "yyyyMMddHHmmss";

    boolean doFullRestore = false;
    Boolean useLogFileLastMode = null;
    Boolean monitorLogBackupDir = null;

    options.addOption(Option.builder().longOpt("conf").desc("Configuration file.").hasArg().build());

    options.addOption(Option.builder().longOpt("laterthan").desc("'Later Than' file filter.").hasArg().build());

    options.addOption(Option.builder().longOpt("restore-full")
            .desc("Restore the full backup before continuing.").build());

    options.addOption(Option.builder().longOpt("use-lastmod")
            .desc("Sort/filter the log backups using their File-System 'Last Modified' date.").build());

    options.addOption(Option.builder().longOpt("monitor-backup-dir")
            .desc("Monitor the backup directory for new log backups, and apply them.").build());

    CommandLine line = null;
    try {
        try {
            line = parser.parse(options, args);
        } catch (ParseException ex) {
            throw new MSSQLApplyLogException(String.format("Error parsing command line.'%s'", ex.getMessage()),
                    ex);
        }

        String confFile = null;

        // Process the command line arguments
        Iterator cmdI = line.iterator();
        while (cmdI.hasNext()) {
            Option currOpt = (Option) cmdI.next();
            String currOptName = currOpt.getLongOpt();

            switch (currOptName) {
            case "conf":
                // Parse the configuration file
                confFile = currOpt.getValue();
                break;

            case "laterthan":
                // "Later Than" file date filter
                laterThanStr = currOpt.getValue();
                break;

            case "restore-full":
                // Do a full backup restore before restoring logs
                doFullRestore = true;
                break;

            case "monitor-backup-dir":
                // Monitor the backup directory for new logs
                monitorLogBackupDir = true;
                break;

            case "use-lastmod":
                // Use the last-modified date on Log Backup files for sorting/filtering
                useLogFileLastMode = true;
                break;
            }
        }

        Properties confProperties = null;

        if (StringUtils.isBlank(confFile) || Files.isReadable(Paths.get(confFile)) == false) {
            throw new MSSQLApplyLogException(
                    "Missing or unreadable configuration file.  Please specify --conf");
        } else {
            // Process the conf.properties file
            confProperties = new Properties();
            try {
                confProperties.load(Files.newBufferedReader(Paths.get(confFile)));
            } catch (IOException ex) {
                throw new MSSQLApplyLogException("Error loading properties file", ex);
            }

            sqlURL = confProperties.getProperty("sqlURL", "");
            sqlUser = confProperties.getProperty("sqlUser", "");
            sqlPass = confProperties.getProperty("sqlPass", "");
            sqlDb = confProperties.getProperty("sqlDb", "");
            sqlHost = confProperties.getProperty("sqlHost", "");
            backupDirStr = confProperties.getProperty("backupDir", "");

            if (StringUtils.isBlank(laterThanStr)) {
                laterThanStr = confProperties.getProperty("laterThan", "");
            }

            fullBackupPathStr = confProperties.getProperty("fullBackupPath", fullBackupPathStr);
            fullBackupPatternStr = confProperties.getProperty("fullBackupPattern", fullBackupPatternStr);
            fullBackupDatePatternStr = confProperties.getProperty("fullBackupDatePattern",
                    fullBackupDatePatternStr);
            sqlProcessUser = confProperties.getProperty("sqlProcessUser", "");

            logBackupPatternStr = confProperties.getProperty("logBackupPattern", logBackupPatternStr);
            logBackupDatePatternStr = confProperties.getProperty("logBackupDatePattern",
                    logBackupDatePatternStr);

            if (useLogFileLastMode == null) {
                String useLogFileLastModeStr = confProperties.getProperty("useLogFileLastMode", "false");
                useLogFileLastMode = Boolean
                        .valueOf(StringUtils.lowerCase(StringUtils.trim(useLogFileLastModeStr)));
            }

            if (monitorLogBackupDir == null) {
                String monitorBackupDirStr = confProperties.getProperty("monitorBackupDir", "false");
                monitorLogBackupDir = Boolean
                        .valueOf(StringUtils.lowerCase(StringUtils.trim(monitorBackupDirStr)));
            }
        }
    } catch (MSSQLApplyLogException ex) {
        try (StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw)) {
            pw.append(String.format("Error : '%s'\n\n", ex.getMessage()));

            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp(pw, 80, "\njava -jar mssqlapplylog.jar ",
                    "\nThe MSSQLApplyLog application can be used in a variety of options and modes.\n", options,
                    0, 2, " All Rights Reserved.", true);

            System.out.println(sw.toString());
        } catch (IOException iex) {
            LOGGER.debug("Error processing usage", iex);
        }

        System.exit(1);
    }

    MSSQLApplyLogConfig config = MSSQLApplyLogConfig.from(backupDirStr, fullBackupPathStr,
            fullBackupDatePatternStr, laterThanStr, fullBackupPatternStr, logBackupPatternStr,
            logBackupDatePatternStr, sqlHost, sqlDb, sqlUser, sqlPass, sqlURL, sqlProcessUser,
            useLogFileLastMode, doFullRestore, monitorLogBackupDir);

    MSSQLApplyLog logProc = MSSQLApplyLog.from(config);

    BasicThreadFactory thFactory = new BasicThreadFactory.Builder().namingPattern("restoreThread-%d").build();

    ExecutorService mainThreadExe = Executors.newSingleThreadExecutor(thFactory);

    Future<Integer> currRunTask = mainThreadExe.submit(logProc);

    mainThreadExe.shutdown();

    Integer resp = 0;
    try {
        resp = currRunTask.get();
    } catch (InterruptedException ex) {
        LOGGER.error("Application 'main' thread was interrupted", ex);
    } catch (ExecutionException ex) {
        LOGGER.error("Application 'main' thread execution error", ex);
    } finally {
        // If main leaves for any reason, shutdown all threads
        mainThreadExe.shutdownNow();
    }

    System.exit(resp);
}

From source file:dk.defxws.fedoragsearch.server.GTransformer.java

public static void main(String[] args) {
    int argCount = 2;
    try {//from  ww w .  j av  a2s.c o m
        if (args.length == argCount) {
            File f = new File(args[1]);
            StreamSource ss = new StreamSource(new File(args[1]));
            GTransformer gt = new GTransformer();
            StreamResult destStream = new StreamResult(new StringWriter());
            gt.transform(args[0], ss, destStream);
            StringWriter sw = (StringWriter) destStream.getWriter();
            System.out.print(sw.getBuffer().toString());
        } else {
            throw new IOException("Must supply " + argCount + " arguments.");
        }
    } catch (Exception e) {
        e.printStackTrace();
        System.err.println("Usage: GTransformer xsltName xmlFileName");
    }
}

From source file:com.appeligo.responsetest.ServerResponseChecker.java

/**
 * @param args/*ww w .  j a  va2 s  .c om*/
 */
public static void main(String[] args) {

    PatternLayout pattern = new PatternLayout("%d{ISO8601} %-5p [%-c{1} - %t] - %m%n");
    ConsoleAppender consoleAppender = new ConsoleAppender(pattern);
    LevelRangeFilter infoFilter = new LevelRangeFilter();
    infoFilter.setLevelMin(Level.INFO);
    consoleAppender.addFilter(infoFilter);
    BasicConfigurator.configure(consoleAppender);

    String configFile = "/etc/flip.tv/responsetest.xml";

    if (args.length > 0) {
        if (args.length == 2 && args[0].equals("-config")) {
            configFile = args[1];
        } else {
            log.error("Usage: java " + ServerResponseChecker.class.getName() + " [-config <xmlfile>]");
            System.exit(1);
        }
    }

    try {
        XMLConfiguration config = new XMLConfiguration(configFile);

        logFile = config.getString("logFile", logFile);
        servlet = config.getString("servlet", servlet);
        timeoutSeconds = config.getLong("timeoutSeconds", timeoutSeconds);
        responseTimeThresholdSeconds = config.getLong("responseTimeThresholdSeconds",
                responseTimeThresholdSeconds);
        reporter = config.getString("reporter", reporter);
        smtpServer = config.getString("smtpServer", smtpServer);
        smtpUsername = config.getString("smtpUsername", smtpUsername);
        smtpPassword = config.getString("smtpPassword", smtpPassword);
        smtpDebug = config.getBoolean("smtpDebug", smtpDebug);
        mailTo = config.getString("mailTo", mailTo);
    } catch (ConfigurationException e) {
        e.printStackTrace();
    }

    marker = logFile + ".mailed";

    try {
        BasicConfigurator.configure(new RollingFileAppender(pattern, logFile, true));
    } catch (IOException e1) {
        e1.printStackTrace();
    }

    // Add email appender
    SMTPAppender mailme = new SMTPAppender();
    LevelRangeFilter warnFilter = new LevelRangeFilter();
    warnFilter.setLevelMin(Level.WARN);
    mailme.addFilter(warnFilter);
    mailme.setSMTPDebug(smtpDebug);
    mailme.setSMTPHost(smtpServer);
    mailme.setTo(mailTo);
    mailme.setFrom(reporter + " <" + smtpUsername + ">");
    mailme.setBufferSize(1);
    mailme.setSubject(servlet + " Not Responding!");
    mailme.setSMTPUsername(smtpUsername);
    mailme.setSMTPPassword(smtpPassword);
    mailme.setLayout(new SimpleLayout());
    mailme.activateOptions();
    mailme.setLayout(pattern);
    BasicConfigurator.configure(mailme);

    long before;
    ConnectionThread connectionThread = new ConnectionThread();
    connectionThread.start();
    synchronized (connectionThread) {
        connectionThread.setOkToGo(true);
        connectionThread.notifyAll();
        before = System.currentTimeMillis();
        long delay = timeoutSeconds * 1000;
        while (!done && delay > 0) {
            try {
                connectionThread.wait(delay);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            delay -= (System.currentTimeMillis() - before);
        }
    }
    long after = System.currentTimeMillis();
    responseMillis = after - before;
    String reportStatus = "Could not report";
    try {
        StringBuilder sb = new StringBuilder();
        sb.append(servlet + "/responsetest/report.action");
        sb.append("?reporter=" + URLEncoder.encode(reporter));
        sb.append("&status=" + URLEncoder.encode(status));
        sb.append("&bytesRead=" + bytesRead);
        sb.append("&timedOut=" + (!done));
        if (throwable == null) {
            sb.append("&exception=none");
        } else {
            sb.append("&exception="
                    + URLEncoder.encode(throwable.getClass().getName() + "-" + throwable.getMessage()));
        }
        sb.append("&responseMillis=" + responseMillis);
        URL reportURL = new URL(sb.toString());
        connection = (HttpURLConnection) reportURL.openConnection();
        connection.connect();
        reportStatus = connection.getResponseCode() + " - " + connection.getResponseMessage();
    } catch (Throwable t) {
        reportStatus = t.getClass().getName() + "-" + t.getMessage();
    }
    StringBuilder sb = new StringBuilder();
    sb.append(servlet + ": ");
    sb.append(status + ", " + bytesRead + " bytes, ");
    if (done) {
        sb.append("DONE, ");
    } else {
        sb.append("TIMED OUT, ");
    }
    sb.append(responseMillis + " millisecond response, ");
    sb.append(" report status=" + reportStatus);
    File markerFile = new File(marker);
    if (done && status.startsWith("200") && (throwable == null)) {
        if ((responseMillis / 1000) < responseTimeThresholdSeconds) {
            if (markerFile.exists()) {
                markerFile.delete();
            }
            log.debug(sb.toString());
        } else {
            if (markerFile.exists()) {
                log.info(sb.toString());
            } else {
                try {
                    new FileOutputStream(marker).close();
                    log.warn(sb.toString());
                } catch (IOException e) {
                    log.info(sb.toString());
                    log.info("Can't send email alert because could not write marker file: " + marker + ". "
                            + e.getMessage());
                }
            }
        }
    } else {
        if (throwable != null) {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            throwable.printStackTrace(pw);
            sb.append(sw.toString());
        }
        if (markerFile.exists()) {
            log.info(sb.toString());
        } else {
            try {
                new FileOutputStream(marker).close();
                log.fatal(sb.toString()); // chosen appender layout ignoresThrowable()
            } catch (IOException e) {
                log.info(sb.toString());
                log.info("Can't send email alert because could not write marker file: " + marker + ". "
                        + e.getMessage());
            }
        }
    }
}

From source file:ekb.elastic.ingest.TaxiQuery.java

public static void main(String... args) {

    Options options = new Options();
    HelpFormatter help = new HelpFormatter();

    try {/*w  w  w.j  av a 2  s . co  m*/
        Option hostOpt = new Option("h", "host", true, "ElasticSearch URL");
        hostOpt.setArgs(1);
        hostOpt.setRequired(true);
        Option portOpt = new Option("p", "port", true, "ElasticSearch URL");
        portOpt.setArgs(1);
        portOpt.setRequired(true);
        Option clusterOpt = new Option("c", "cluster", true, "Cluster");
        clusterOpt.setArgs(1);
        clusterOpt.setRequired(true);
        Option indexOpt = new Option("i", "index", true, "The index");
        indexOpt.setArgs(1);
        indexOpt.setRequired(true);

        Option pickupTimeOpt = new Option("u", "pickup", true, "The pickup time");
        pickupTimeOpt.setArgs(1);
        pickupTimeOpt.setRequired(true);
        Option dropTimeOpt = new Option("d", "dropoff", true, "The dropoff time");
        dropTimeOpt.setArgs(1);
        dropTimeOpt.setRequired(true);

        options.addOption(hostOpt);
        options.addOption(portOpt);
        options.addOption(clusterOpt);
        options.addOption(indexOpt);
        options.addOption(pickupTimeOpt);
        options.addOption(dropTimeOpt);

        GnuParser parser = new GnuParser();
        CommandLine cmd = parser.parse(options, args);

        Settings settings = ImmutableSettings.settingsBuilder().put("cluster.name", cmd.getOptionValue('c'))
                .build();
        Client client = new TransportClient(settings).addTransportAddress(new InetSocketTransportAddress(
                cmd.getOptionValue('h'), Integer.parseInt(cmd.getOptionValue('p'))));

        TaxiQuery tq = new TaxiQuery();

        TaxiStats stats = tq.getTaxiStats(client, cmd.getOptionValues("i"));

        log.info("Results:\n" + stats.toDateString());

        sdf.parse(cmd.getOptionValue("u"));
        sdf.parse(cmd.getOptionValue("d"));

        // 2013-01-01T10:10:00

        ArrayList<TaxiBucket> list = tq.getInterval(client, cmd.getOptionValues("index"),
                cmd.getOptionValue("u"), cmd.getOptionValue("d"), 60);

        log.info("List size is: " + list.size());

        client.close();

    } catch (ParseException pe) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);

        help.printUsage(pw, 80, TaxiQuery.class.getName(), options);

        log.error(sw.toString());

    } catch (TaxiQueryException e) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        e.printStackTrace(pw);
        log.error(sw.toString());
    } catch (java.text.ParseException e) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        e.printStackTrace(pw);
        log.error(sw.toString());
    }
}

From source file:Main.java

public static String getStackTrace(Throwable t) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    t.printStackTrace(pw);//w ww  . j av a 2s.c  o  m
    return sw.toString();
}

From source file:Main.java

public static String getStackTrace(Throwable t) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw, true);
    t.printStackTrace(pw);/*from ww w  .  java 2  s  .co m*/
    pw.flush();
    sw.flush();
    return sw.toString();
}

From source file:Main.java

public static String getExceptionStackTrace(Exception e) {
    StringWriter sw = new StringWriter();
    e.printStackTrace(new PrintWriter(sw));
    return sw.toString();
}

From source file:Main.java

public static String getExceptionStackTrace(Exception e) {
    Writer writer = new StringWriter();
    PrintWriter printWriter = new PrintWriter(writer);
    e.printStackTrace(printWriter);//from  w  w w . ja v  a  2s  .  c  o m
    return writer.toString();
}