public String toYaml() {
	StringWriter writer = new StringWriter();
	DumperOptions dumperOptions = new DumperOptions();
	Serializer serializer = new Serializer(new Emitter(writer, dumperOptions), 
			new Resolver(), dumperOptions, Tag.MAP);
	try {
		serializer.open();
		serializer.serialize(this);
		serializer.close();
		return writer.toString();
	} catch (IOException e) {
		throw new RuntimeException(e);
	}
}
 

@Override
public SoyValue applyForJava(SoyValue value, List<SoyValue> args) {
  Preconditions.checkArgument(
      value instanceof PrimitiveData || value instanceof SanitizedContent,
      "|yamlprimitive directive only supports primitive types");
  Node node;
  if (value instanceof BooleanData) {
    node = representer.represent(value.booleanValue());
  } else if (value instanceof FloatData) {
    node = representer.represent(value.floatValue());
  } else if (value instanceof IntegerData) {
    node = representer.represent(value.integerValue());
  } else {
    node = representer.represent(value.coerceToString());
  }
  int indent = args.get(0).integerValue();
  StringWriter writer = new StringWriter();
  Serializer serializer = new Serializer(
      new Emitter(writer, dumperOptions), resolver, dumperOptions, null);
  try {
    serializer.open();
    serializer.serialize(node);
    serializer.close();
    return StringData.forValue(indentLines(writer.toString().trim(), indent));
  } catch (IOException e) {
    // Should not happen.
    throw new RuntimeException(e);
  }
}
 

@VisibleForTesting
@Restricted(NoExternalUse.class)
public static void serializeYamlNode(Node root, Writer writer) throws IOException {
    DumperOptions options = new DumperOptions();
    options.setDefaultFlowStyle(BLOCK);
    options.setDefaultScalarStyle(PLAIN);
    options.setSplitLines(true);
    options.setPrettyFlow(true);
    Serializer serializer = new Serializer(new Emitter(writer, options), new Resolver(),
            options, null);
    serializer.open();
    serializer.serialize(root);
    serializer.close();
}
 

private void dumpAll(Iterator<? extends Object> data, Writer output, Tag rootTag) {
    Serializer serializer = new Serializer(new Emitter(output, dumperOptions), resolver,
            dumperOptions, rootTag);
    try {
        serializer.open();
        while (data.hasNext()) {
            Node node = representer.represent(data.next());
            serializer.serialize(node);
        }
        serializer.close();
    } catch (java.io.IOException e) {
        throw new YAMLException(e);
    }
}
 

/**
 * Serialize the representation tree into Events.
 * 
 * @see <a href="http://yaml.org/spec/1.1/#id859333">Processing Overview</a>
 * @param data
 *            representation tree
 * @return Event list
 */
public List<Event> serialize(Node data) {
    SilentEmitter emitter = new SilentEmitter();
    @SuppressWarnings("deprecation")
    Serializer serializer = new Serializer(emitter, resolver, dumperOptions,
            dumperOptions.getExplicitRoot());
    try {
        serializer.open();
        serializer.serialize(data);
        serializer.close();
    } catch (java.io.IOException e) {
        throw new YAMLException(e);
    }
    return emitter.getEvents();
}
 

private void dumpAll(Iterator<? extends Object> data, Writer output, Tag rootTag) {
    Serializer serializer = new Serializer(new Emitter(output, dumperOptions), resolver,
            dumperOptions, rootTag);
    try {
        serializer.open();
        while (data.hasNext()) {
            Node node = representer.represent(data.next());
            serializer.serialize(node);
        }
        serializer.close();
    } catch (IOException e) {
        throw new YAMLException(e);
    }
}
 

/**
 * Serialize the representation tree into Events.
 * 
 * @see <a href="http://yaml.org/spec/1.1/#id859333">Processing Overview</a>
 * @param data
 *            representation tree
 * @return Event list
 */
public List<Event> serialize(Node data) {
    SilentEmitter emitter = new SilentEmitter();
    Serializer serializer = new Serializer(emitter, resolver, dumperOptions, null);
    try {
        serializer.open();
        serializer.serialize(data);
        serializer.close();
    } catch (IOException e) {
        throw new YAMLException(e);
    }
    return emitter.getEvents();
}
 

private void dumpAll(Iterator<? extends Object> data, Writer output, Tag rootTag) {
    Serializer serializer = new Serializer(new Emitter(output, dumperOptions), resolver,
            dumperOptions, rootTag);
    try {
        serializer.open();
        while (data.hasNext()) {
            Node node = representer.represent(data.next());
            serializer.serialize(node);
        }
        serializer.close();
    } catch (IOException e) {
        throw new YAMLException(e);
    }
}
 

/**
 * Serialize the representation tree into Events.
 *
 * @see <a href="http://yaml.org/spec/1.1/#id859333">Processing Overview</a>
 * @param data
 *            representation tree
 * @return Event list
 */
public List<Event> serialize(Node data) {
    SilentEmitter emitter = new SilentEmitter();
    Serializer serializer = new Serializer(emitter, resolver, dumperOptions, null);
    try {
        serializer.open();
        serializer.serialize(data);
        serializer.close();
    } catch (IOException e) {
        throw new YAMLException(e);
    }
    return emitter.getEvents();
}