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


    if (jobTraceFilename != null) {
      ObjectMapper jmapper = new ObjectMapper();
      jmapper.configure(
          SerializationConfig.Feature.CAN_OVERRIDE_ACCESS_MODIFIERS, true);
      JsonFactory jfactory = jmapper.getJsonFactory();
      FileSystem jobFS = jobTraceFilename.getFileSystem(getConf());
      jobTraceGen = jfactory.createJsonGenerator(
          jobFS.create(jobTraceFilename), JsonEncoding.UTF8);
      if (prettyprintTrace) {
        jobTraceGen.useDefaultPrettyPrinter();
      }


      if (topologyFilename != null) {
        ObjectMapper tmapper = new ObjectMapper();
        tmapper.configure(
            SerializationConfig.Feature.CAN_OVERRIDE_ACCESS_MODIFIERS, true);
        JsonFactory tfactory = tmapper.getJsonFactory();
        FileSystem topoFS = topologyFilename.getFileSystem(getConf());
        topologyGen = tfactory.createJsonGenerator(
            topoFS.create(topologyFilename), JsonEncoding.UTF8);
        topologyGen.useDefaultPrettyPrinter();
      }
    }

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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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  public JsonDecoder configure(String in) throws IOException {
    if (null == in) {
      throw new NullPointerException("String to read from cannot be null!");
    }
    parser.reset();
    this.in = new JsonFactory().createJsonParser(in);
    this.in.nextToken();
    return this;
  }

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        DataFileReader.openReader(new File(status.getPath().toUri()), reader);
      Schema schema = fileReader.getSchema();
      writer = new GenericDatumWriter<Object>(schema);
      output = new ByteArrayOutputStream();
      JsonGenerator generator =
        new JsonFactory().createJsonGenerator(output, JsonEncoding.UTF8);
      MinimalPrettyPrinter prettyPrinter = new MinimalPrettyPrinter();
      prettyPrinter.setRootValueSeparator(System.getProperty("line.separator"));
      generator.setPrettyPrinter(prettyPrinter);
      encoder = EncoderFactory.get().jsonEncoder(schema, generator);
    }

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    {
        File manifestFile = cfs.directories.getOrCreateLeveledManifest();
        File oldFile = new File(manifestFile.getPath().replace(EXTENSION, "-old.json"));
        File tmpFile = new File(manifestFile.getPath().replace(EXTENSION, "-tmp.json"));


        JsonFactory f = new JsonFactory();
        try
        {
            JsonGenerator g = f.createJsonGenerator(tmpFile, JsonEncoding.UTF8);
            g.useDefaultPrettyPrinter();
            g.writeStartObject();
            g.writeArrayFieldStart("generations");
            for (int level = 0; level < generations.length; level++)
            {

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        assertTrue(t.getAlong()==t2.getAlong());
    }
    
    public void jacksonTest() throws Exception
    {
        JsonFactory factory = new JsonFactory();
        StringWriter writer = new StringWriter();
        JsonGenerator generator = factory.createJsonGenerator(writer);
        generator.writeStartObject();
        generator.writeFieldName("bool");
        generator.writeBoolean(true);
        generator.writeFieldName("firstName");
        generator.writeString("john");
        generator.writeFieldName("age");
        generator.writeNumber(1);
        generator.writeFieldName("gg");
        generator.writeStartObject();
        generator.writeFieldName("firstName");
        generator.writeString("john");
        generator.writeEndObject();
        
        generator.writeEndObject();
        generator.close();
        String generated = writer.toString();
        System.out.print(generated);
        
        JsonParser parser = factory.createJsonParser(generated);
        assertTrue(parser.nextToken()==JsonToken.START_OBJECT);
        parser.nextToken();
        
        assertEquals("bool", parser.getCurrentName());
        assertTrue(parser.nextToken()==JsonToken.VALUE_TRUE);

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    }
    
    StringWriter sw = new StringWriter();
    try
    {
      JsonFactory f = new JsonFactory();
      JsonGenerator g = f.createJsonGenerator(sw);


      g.writeStartObject();


      // write id field
      g.writeRaw("\n  ");

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    ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
    ZNRecord record = null;


    try
    {
      JsonFactory f = new JsonFactory();
      JsonParser jp = f.createJsonParser(bais);


      jp.nextToken(); // will return JsonToken.START_OBJECT (verify?)
      while (jp.nextToken() != JsonToken.END_OBJECT)
      {
        String fieldname = jp.getCurrentName();

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        if (manifestFile == null)
            manifestFile = new File(new File(DatabaseDescriptor.getAllDataFileLocations()[0], cfs.table.name), cfs.columnFamily + ".json");
        File oldFile = new File(manifestFile.getPath().replace(EXTENSION, "-old.json"));
        File tmpFile = new File(manifestFile.getPath().replace(EXTENSION, "-tmp.json"));


        JsonFactory f = new JsonFactory();
        try
        {
            JsonGenerator g = f.createJsonGenerator(tmpFile, JsonEncoding.UTF8);
            g.useDefaultPrettyPrinter();
            g.writeStartObject();
            g.writeArrayFieldStart("generations");
            for (int level = 0; level < generations.length; level++)
            {

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    {
        File manifestFile = cfs.directories.getOrCreateLeveledManifest();
        File oldFile = new File(manifestFile.getPath().replace(EXTENSION, "-old.json"));
        File tmpFile = new File(manifestFile.getPath().replace(EXTENSION, "-tmp.json"));


        JsonFactory f = new JsonFactory();
        try
        {
            JsonGenerator g = f.createJsonGenerator(tmpFile, JsonEncoding.UTF8);
            g.useDefaultPrettyPrinter();
            g.writeStartObject();
            g.writeArrayFieldStart("generations");
            for (int level = 0; level < generations.length; level++)
            {

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