Examples of com.fasterxml.jackson.core.JsonFactory

com.fasterxml.jackson.core.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

   */
  @SuppressWarnings("unchecked")
  public static String dumpConfigurationAsJson(String section) {
    Class en = CONFIGURATION_SECTIONS.get(section);
    try {
      JsonFactory jfactory = new JsonFactory();
      StringWriter sw = new StringWriter();
      String enumDescription = "";      
      JsonGenerator gen = jfactory.createJsonGenerator(sw);
      
      Method getEnumDescription= en.getMethod("getEnumDescription");
      if (getEnumDescription!=null  && getEnumDescription.getReturnType()==String.class && Modifier.isStatic(getEnumDescription.getModifiers()))
          enumDescription=(String) getEnumDescription.invoke(null);
      gen.writeStartObject();                                            //{

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  }//dumpConfigurationAsJson(en)
  
  public static String dumpConfigurationAsJson(){
    ImmutableCollection<String> keys = CONFIGURATION_SECTIONS.keySet();  
    ObjectMapper mapper = new ObjectMapper();
    JsonFactory jfactory = mapper.getJsonFactory();
    StringWriter sw = new StringWriter();  
    try{
      JsonGenerator gen = jfactory.createJsonGenerator(sw);
      gen.writeStartArray();  
      for (String v: keys){
        String st = dumpConfigurationAsJson(v);
        ObjectMapper op= new ObjectMapper();
        JsonNode p = op.readTree(st);

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  }//dumpConfiguration
  
  public static String dumpConfigurationSectionAsFlatJson(String section){
    Class en = CONFIGURATION_SECTIONS.get(section);
    try {
      JsonFactory jfactory = new JsonFactory();
      StringWriter sw = new StringWriter();
      String enumDescription = "";      
      JsonGenerator gen = jfactory.createJsonGenerator(sw);
      gen.writeStartArray();  
      EnumSet values = EnumSet.allOf( en );
      for (Object v : values) {
          String key=(String) (en.getMethod("getKey")).invoke(v);

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    }
  }
  
  private String getStatusFromJsonResponse(String responsbody) throws ManifoldCFException {
    try {
      JsonParser parser = new JsonFactory().createJsonParser(responsbody);
      while (parser.nextToken() != JsonToken.END_OBJECT)
      {
        String name = parser.getCurrentName();
        if("status".equalsIgnoreCase(name)){
          parser.nextToken();

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  public static String toString(PartitionStrategy strategy, boolean pretty) {
    StringWriter writer = new StringWriter();
    JsonGenerator gen;
    try {
      gen = new JsonFactory().createGenerator(writer);
      if (pretty) {
        gen.useDefaultPrettyPrinter();
      }
      gen.setCodec(new ObjectMapper());
      gen.writeTree(toJson(strategy));

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    private final ObjectReader reader;


    public ReadJson(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
      super(builder, config, parent, child, context);
      
      JsonFactory jsonFactory = null;
      String jsonFactoryClassName = getConfigs().getString(config, "jsonFactory", null);
      if (jsonFactoryClassName != null) {
        try {
          jsonFactory = (JsonFactory) Class.forName(jsonFactoryClassName).newInstance();
        } catch (Exception e) {

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  public static String toString(FieldMapping mapping) {
    StringWriter writer = new StringWriter();
    JsonGenerator gen;
    try {
      gen = new JsonFactory().createGenerator(writer);
      gen.setCodec(new ObjectMapper());
      gen.writeTree(toJson(mapping));
      gen.close();
    } catch (IOException e) {
      throw new DatasetIOException("Cannot write to JSON generator", e);

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  public static String toString(ColumnMapping mapping, boolean pretty) {
    StringWriter writer = new StringWriter();
    JsonGenerator gen;
    try {
      gen = new JsonFactory().createGenerator(writer);
      if (pretty) {
        gen.useDefaultPrettyPrinter();
      }
      gen.setCodec(new ObjectMapper());
      gen.writeTree(toJson(mapping));

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    private final ObjectReader reader;


    public ReadJson(CommandBuilder builder, Config config, Command parent, Command child, MorphlineContext context) {
      super(builder, config, parent, child, context);
      
      JsonFactory jsonFactory = null;
      String jsonFactoryClassName = getConfigs().getString(config, "jsonFactory", null);
      if (jsonFactoryClassName != null) {
        try {
          jsonFactory = (JsonFactory) Class.forName(jsonFactoryClassName).newInstance();
        } catch (Exception e) {

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    final String keyName = "testKey";
    final String json = "{ \"" + keyName + "\" : 1 }";
    final byte[] jsonAsBytes = json.getBytes(Data.UTF_8_CHARSET);


    {
      final JsonFactory jsonFactory = new JsonFactory();
      final JacksonDataCodec codec = new JacksonDataCodec(jsonFactory);
      // make sure intern field names is not enabled
      assertFalse(jsonFactory.isEnabled(JsonFactory.Feature.INTERN_FIELD_NAMES));
      assertTrue(jsonFactory.isEnabled(JsonFactory.Feature.CANONICALIZE_FIELD_NAMES));
      final DataMap map = codec.bytesToMap(jsonAsBytes);
      final String key = map.keySet().iterator().next();
      assertNotSame(key, keyName);
    }


    {
      final JsonFactory jsonFactory = new JsonFactory();
      final JacksonDataCodec codec = new JacksonDataCodec(jsonFactory);
      // enable intern field names
      jsonFactory.enable(JsonFactory.Feature.INTERN_FIELD_NAMES);
      assertTrue(jsonFactory.isEnabled(JsonFactory.Feature.INTERN_FIELD_NAMES));
      assertTrue(jsonFactory.isEnabled(JsonFactory.Feature.CANONICALIZE_FIELD_NAMES));
      final DataMap map = codec.bytesToMap(jsonAsBytes);
      final String key = map.keySet().iterator().next();
      assertSame(key, keyName);
    }
  }

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