Module tools.jackson.databind

Package tools.jackson.databind.ser.std

Class NullSerializer

java.lang.Object

tools.jackson.databind.ValueSerializer<T>

tools.jackson.databind.ser.std.StdSerializer<Object>

tools.jackson.databind.ser.std.NullSerializer

All Implemented Interfaces:

JsonFormatVisitable

public class NullSerializer
extends StdSerializer<Object>

This is a simple dummy serializer that will just output literal JSON null value whenever serialization is requested. Used as the default "null serializer" (which is used for serializing null object references unless overridden), as well as for some more exotic types (java.lang.Void).

Nested Class Summary

Nested classes/interfaces inherited from class tools.jackson.databind.ValueSerializer

ValueSerializer.None

Field Summary

Fields

Modifier and Type	Field	Description
static final NullSerializer	instance

Fields inherited from class tools.jackson.databind.ser.std.StdSerializer

_handledType

Method Summary

Modifier and Type	Method	Description
void	acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)	Default implementation specifies no format.
void	serialize(Object value, JsonGenerator gen, SerializationContext provider)	Method that can be called to ask implementation to serialize values of type this serializer handles.
void	serializeWithType(Object value, JsonGenerator gen, SerializationContext serializers, TypeSerializer typeSer)	Although this method should rarely get called, for convenience we should override it, and handle it same way as "natural" types: by serializing exactly as is, without type decorations.

Methods inherited from class tools.jackson.databind.ser.std.StdSerializer

_neitherNull, _nonEmpty, _wrapIOFailure, acceptJsonFormatVisitorForBinary, createSchemaNode, createSchemaNode, findAnnotatedContentSerializer, findContextualConvertingSerializer, findFormatFeature, findFormatOverrides, findIncludeOverrides, findPropertyFilter, handledType, isDefaultSerializer, visitArrayFormat, visitArrayFormat, visitFloatFormat, visitIntFormat, visitIntFormat, visitStringFormat, visitStringFormat, wrapAndThrow, wrapAndThrow

Methods inherited from class tools.jackson.databind.ValueSerializer

createContextual, getDelegatee, isEmpty, isUnwrappingSerializer, properties, replaceDelegatee, resolve, unwrappingSerializer, usesObjectId, withFilterId, withFormatOverrides, withIgnoredProperties

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

instance

public static final NullSerializer instance

Method Details

serialize

public void serialize(Object value,
 JsonGenerator gen,
 SerializationContext provider)
               throws JacksonException

Description copied from class: ValueSerializer

Method that can be called to ask implementation to serialize values of type this serializer handles.

Specified by:

serialize in class StdSerializer<Object>

Parameters:

value - Value to serialize; can not be null.

gen - Generator used to output resulting Json content

provider - Context that can be used to get serializers for serializing Objects value contains, if any.

Throws:

JacksonException

serializeWithType

public void serializeWithType(Object value,
 JsonGenerator gen,
 SerializationContext serializers,
 TypeSerializer typeSer)
                       throws JacksonException

Although this method should rarely get called, for convenience we should override it, and handle it same way as "natural" types: by serializing exactly as is, without type decorations. The most common possible use case is that of delegation by JSON filter; caller cannot know what kind of serializer it gets handed.

Overrides:

serializeWithType in class ValueSerializer<Object>

Parameters:

value - Value to serialize; can not be null.

gen - Generator used to output resulting Json content

serializers - Context that can be used to get serializers for serializing Objects value contains, if any.

typeSer - Type serializer to use for including type information

Throws:

JacksonException

acceptJsonFormatVisitor

public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor,
 JavaType typeHint)

Description copied from class: StdSerializer

Default implementation specifies no format. This behavior is usually overriden by custom serializers.

Specified by:

acceptJsonFormatVisitor in interface JsonFormatVisitable

Overrides:

acceptJsonFormatVisitor in class StdSerializer<Object>

typeHint - Type of element (entity like property) being visited