Examples of org.codehaus.jackson.JsonFactory

org.codehaus.jackson.JsonFactory
The main factory class of Jackson package, used to configure and construct reader (aka parser, {@link JsonParser}) and writer (aka generator, {@link JsonGenerator}) instances.
Factory instances are thread-safe and reusable after configuration (if any). Typically applications and services use only a single globally shared factory instance, unless they need differently configured factories. Factory reuse is important if efficiency matters; most recycling of expensive construct is done on per-factory basis.
Creation of a factory instance is a light-weight operation, and since there is no need for pluggable alternative implementations (as there is no "standard" JSON processor API to implement), the default constructor is used for constructing factory instances. @author Tatu Saloranta

    // \u2013 is EN DASH
    r.put(stringField.name(), "hello\nthere\"\tyou\u2013}");
    r.put(enumField.name(), new GenericData.EnumSymbol(enumField.schema(),"a"));
    
    String json = r.toString();
    JsonFactory factory = new JsonFactory();
    JsonParser parser = factory.createJsonParser(json);
    ObjectMapper mapper = new ObjectMapper();
    
    // will throw exception if string is not parsable json
    mapper.readTree(parser);
  }

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   * @param out the Writer to write to
   * @throws IOException
   */
  public static void dumpConfiguration(Configuration config,
      Writer out) throws IOException {
    JsonFactory dumpFactory = new JsonFactory();
    JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
    dumpGenerator.writeStartObject();
    dumpGenerator.writeFieldName("properties");
    dumpGenerator.writeStartArray();
    dumpGenerator.flush();
    synchronized (config) {

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    // \u2013 is EN DASH
    r.put(stringField.name(), "hello\nthere\"\tyou\u2013}");
    r.put(enumField.name(), new GenericData.EnumSymbol(enumField.schema(),"a"));
    
    String json = r.toString();
    JsonFactory factory = new JsonFactory();
    JsonParser parser = factory.createJsonParser(json);
    ObjectMapper mapper = new ObjectMapper();
    
    // will throw exception if string is not parsable json
    mapper.readTree(parser);
  }

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   * @param out the Writer to write to
   * @throws IOException
   */
  public static void dumpConfiguration(Configuration config,
      Writer out) throws IOException {
    JsonFactory dumpFactory = new JsonFactory();
    JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
    dumpGenerator.writeStartObject();
    dumpGenerator.writeFieldName("properties");
    dumpGenerator.writeStartArray();
    dumpGenerator.flush();
    synchronized (config) {

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   * parse the sls trace file, return each host name
   */
  public static Set<String> parseNodesFromSLSTrace(String jobTrace)
          throws IOException {
    Set<String> nodeSet = new HashSet<String>();
    JsonFactory jsonF = new JsonFactory();
    ObjectMapper mapper = new ObjectMapper();
    Reader input = new FileReader(jobTrace);
    try {
      Iterator<Map> i = mapper.readValues(
              jsonF.createJsonParser(input), Map.class);
      while (i.hasNext()) {
        Map jsonE = i.next();
        List tasks = (List) jsonE.get("job.tasks");
        for (Object o : tasks) {
          Map jsonTask = (Map) o;

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   * parse the input node file, return each host name
   */
  public static Set<String> parseNodesFromNodeFile(String nodeFile)
          throws IOException {
    Set<String> nodeSet = new HashSet<String>();
    JsonFactory jsonF = new JsonFactory();
    ObjectMapper mapper = new ObjectMapper();
    Reader input = new FileReader(nodeFile);
    try {
      Iterator<Map> i = mapper.readValues(
              jsonF.createJsonParser(input), Map.class);
      while (i.hasNext()) {
        Map jsonE = i.next();
        String rack = "/" + jsonE.get("rack");
        List tasks = (List) jsonE.get("nodes");
        for (Object o : tasks) {

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   */
  @SuppressWarnings("unchecked")
  private void startAMFromSLSTraces(Resource containerResource,
                                    int heartbeatInterval) throws IOException {
    // parse from sls traces
    JsonFactory jsonF = new JsonFactory();
    ObjectMapper mapper = new ObjectMapper();
    for (String inputTrace : inputTraces) {
      Reader input = new FileReader(inputTrace);
      try {
        Iterator<Map> i = mapper.readValues(jsonF.createJsonParser(input),
                Map.class);
        while (i.hasNext()) {
          Map jsonJob = i.next();


          // load job information

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      Writer output = new FileWriter(outputFile);
      try {
        ObjectMapper mapper = new ObjectMapper();
        ObjectWriter writer = mapper.writerWithDefaultPrettyPrinter();
        Iterator<Map> i = mapper.readValues(
                new JsonFactory().createJsonParser(input), Map.class);
        while (i.hasNext()) {
          Map m = i.next();
          output.write(writer.writeValueAsString(createSLSJob(m)) + EOL);
        }
      } finally {

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   * @param out the Writer to write to
   * @throws IOException
   */
  public static void dumpConfiguration(Configuration config,
      Writer out) throws IOException {
    JsonFactory dumpFactory = new JsonFactory();
    JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
    dumpGenerator.writeStartObject();
    dumpGenerator.writeFieldName("properties");
    dumpGenerator.writeStartArray();
    dumpGenerator.flush();
    synchronized (config) {

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  private static JsonGenerator getJsonGenerator(OutputStream out, boolean pretty)
      throws IOException {
    if (null == out)
      throw new NullPointerException("OutputStream cannot be null"); 
    JsonGenerator g
      = new JsonFactory().createJsonGenerator(out, JsonEncoding.UTF8);
    if (pretty) {
      DefaultPrettyPrinter pp = new DefaultPrettyPrinter() {
        //@Override
        public void writeRootValueSeparator(JsonGenerator jg)
            throws IOException

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