com.fasterxml.jackson.databind.ser.std

Class JsonValueSerializer

java.lang.Object

com.fasterxml.jackson.databind.JsonSerializer<T>

com.fasterxml.jackson.databind.ser.std.StdSerializer<Object>

com.fasterxml.jackson.databind.ser.std.JsonValueSerializer

All Implemented Interfaces:

JsonFormatVisitable, SchemaAware, ContextualSerializer, Serializable

public class JsonValueSerializer
extends StdSerializer<Object>
implements ContextualSerializer, JsonFormatVisitable, SchemaAware

Serializer class that can serialize Object that have a JsonValue annotation to indicate that serialization should be done by calling the method annotated, and serializing result it returns.

Implementation note: we will post-process resulting serializer (much like what is done with BeanSerializer) to figure out actual serializers for final types. This must be done from createContextual(com.fasterxml.jackson.databind.SerializerProvider, com.fasterxml.jackson.databind.BeanProperty) method, and NOT from constructor; otherwise we could end up with an infinite loop.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonSerializer

JsonSerializer.None

Field Summary

Fields

Modifier and Type	Field and Description
protected AnnotatedMember	_accessor
protected PropertySerializerMap	_dynamicSerializers If value type cannot be statically determined, mapping from runtime value types to serializers are cached in this object.
protected boolean	_forceTypeInformation This is a flag that is set in rare (?) cases where this serializer is used for "natural" types (boolean, int, String, double); and where we actually must force type information wrapping, even though one would not normally be added.
protected BeanProperty	_property
protected JsonSerializer<Object>	_valueSerializer
protected JavaType	_valueType Declared type of the value accessed, as declared by accessor.
protected TypeSerializer	_valueTypeSerializer

Fields inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

_handledType

Constructor Summary

Constructors

Constructor and Description
JsonValueSerializer(AnnotatedMember accessor, JsonSerializer<?> ser) Deprecated. Since 2.12
JsonValueSerializer(AnnotatedMember accessor, TypeSerializer vts, JsonSerializer<?> ser)
JsonValueSerializer(JsonValueSerializer src, BeanProperty property, TypeSerializer vts, JsonSerializer<?> ser, boolean forceTypeInfo)

Method Summary

Modifier and Type	Method and Description
protected boolean	_acceptJsonFormatVisitorForEnum(JsonFormatVisitorWrapper visitor, JavaType typeHint, Class<?> enumType) Overridable helper method used for special case handling of schema information for Enums.
protected JsonSerializer<Object>	_findDynamicSerializer(SerializerProvider ctxt, Class<?> valueClass)
void	acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) Default implementation specifies no format.
JsonSerializer<?>	createContextual(SerializerProvider ctxt, BeanProperty property) We can try to find the actual serializer for value, if we can statically figure out what the result type must be.
JsonNode	getSchema(SerializerProvider ctxt, Type typeHint) Default implementation simply claims type is "string"; usually overriden by custom serializers.
boolean	isEmpty(SerializerProvider ctxt, Object bean) Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).
protected boolean	isNaturalTypeWithStdHandling(Class<?> rawType, JsonSerializer<?> ser)
void	serialize(Object bean, JsonGenerator gen, SerializerProvider ctxt) Method that can be called to ask implementation to serialize values of type this serializer handles.
void	serializeWithType(Object bean, JsonGenerator gen, SerializerProvider ctxt, TypeSerializer typeSer0) Method that can be called to ask implementation to serialize values of type this serializer handles, using specified type serializer for embedding necessary type information.
String	toString()
protected JsonValueSerializer	withResolved(BeanProperty property, TypeSerializer vts, JsonSerializer<?> ser, boolean forceTypeInfo)

Methods inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

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

Methods inherited from class com.fasterxml.jackson.databind.JsonSerializer

getDelegatee, isEmpty, isUnwrappingSerializer, properties, replaceDelegatee, unwrappingSerializer, usesObjectId, withFilterId

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.fasterxml.jackson.databind.jsonschema.SchemaAware

getSchema

Field Detail

_accessor

protected final AnnotatedMember _accessor

Since:

2.9

_valueTypeSerializer

protected final TypeSerializer _valueTypeSerializer

Since:

2.12

_valueSerializer

protected final JsonSerializer<Object> _valueSerializer

_property

protected final BeanProperty _property

_valueType

protected final JavaType _valueType

Declared type of the value accessed, as declared by accessor.

Since:

2.12

_forceTypeInformation

protected final boolean _forceTypeInformation

This is a flag that is set in rare (?) cases where this serializer is used for "natural" types (boolean, int, String, double); and where we actually must force type information wrapping, even though one would not normally be added.

_dynamicSerializers

protected transient PropertySerializerMap _dynamicSerializers

If value type cannot be statically determined, mapping from runtime value types to serializers are cached in this object.

Since:

2.12

Constructor Detail

JsonValueSerializer

public JsonValueSerializer(AnnotatedMember accessor,
                           TypeSerializer vts,
                           JsonSerializer<?> ser)

Parameters:

ser - Explicit serializer to use, if caller knows it (which occurs if and only if the "value method" was annotated with JsonSerialize.using()), otherwise null

Since:

2.12 added TypeSerializer since 2.11

JsonValueSerializer

@Deprecated
public JsonValueSerializer(AnnotatedMember accessor,
                                       JsonSerializer<?> ser)

Deprecated. Since 2.12

JsonValueSerializer

public JsonValueSerializer(JsonValueSerializer src,
                           BeanProperty property,
                           TypeSerializer vts,
                           JsonSerializer<?> ser,
                           boolean forceTypeInfo)

Method Detail

withResolved

protected JsonValueSerializer withResolved(BeanProperty property,
                                           TypeSerializer vts,
                                           JsonSerializer<?> ser,
                                           boolean forceTypeInfo)

isEmpty

public boolean isEmpty(SerializerProvider ctxt,
                       Object bean)

Description copied from class: JsonSerializer

Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).

Default implementation will consider only null values to be empty.

NOTE: replaces JsonSerializer.isEmpty(Object), which was deprecated in 2.5

Overrides:

isEmpty in class JsonSerializer<Object>

createContextual

public JsonSerializer<?> createContextual(SerializerProvider ctxt,
                                          BeanProperty property)
                                   throws JsonMappingException

We can try to find the actual serializer for value, if we can statically figure out what the result type must be.

Specified by:

createContextual in interface ContextualSerializer

Parameters:

ctxt - Serializer provider to use for accessing config, other serializers

property - Method or field that represents the property (and is used to access value to serialize). Should be available; but there may be cases where caller cannot provide it and null is passed instead (in which case impls usually pass 'this' serializer as is)

Returns:

Serializer to use for serializing values of specified property; may be this instance or a new instance.

Throws:

JsonMappingException

serialize

public void serialize(Object bean,
                      JsonGenerator gen,
                      SerializerProvider ctxt)
               throws IOException

Description copied from class: JsonSerializer

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

Specified by:

serialize in class StdSerializer<Object>

Parameters:

bean - Value to serialize; can not be null.

gen - Generator used to output resulting Json content

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

Throws:

IOException

serializeWithType

public void serializeWithType(Object bean,
                              JsonGenerator gen,
                              SerializerProvider ctxt,
                              TypeSerializer typeSer0)
                       throws IOException

Description copied from class: JsonSerializer

Method that can be called to ask implementation to serialize values of type this serializer handles, using specified type serializer for embedding necessary type information.

Default implementation will throw UnsupportedOperationException to indicate that proper type handling needs to be implemented.

For simple datatypes written as a single scalar value (JSON String, Number, Boolean), implementation would look like:

  // note: method to call depends on whether this type is serialized as JSON scalar, object or Array!
  typeSer.writeTypePrefixForScalar(value, gen);
  serialize(value, gen, provider);
  typeSer.writeTypeSuffixForScalar(value, gen);

and implementations for type serialized as JSON Arrays or Objects would differ slightly, as START-ARRAY/END-ARRAY and START-OBJECT/END-OBJECT pairs need to be properly handled with respect to serializing of contents.

Overrides:

serializeWithType in class JsonSerializer<Object>

Parameters:

bean - Value to serialize; can not be null.

gen - Generator used to output resulting Json content

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

typeSer0 - Type serializer to use for including type information

Throws:

IOException

getSchema

public JsonNode getSchema(SerializerProvider ctxt,
                          Type typeHint)
                   throws JsonMappingException

Description copied from class: StdSerializer

Default implementation simply claims type is "string"; usually overriden by custom serializers.

Specified by:

getSchema in interface SchemaAware

Overrides:

getSchema in class StdSerializer<Object>

Parameters:

ctxt - The serializer provider.

typeHint - A hint about the type.

Returns:

Json-schema for this serializer.

Throws:

JsonMappingException

acceptJsonFormatVisitor

public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor,
                                    JavaType typeHint)
                             throws JsonMappingException

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

Throws:

JsonMappingException

_acceptJsonFormatVisitorForEnum

protected boolean _acceptJsonFormatVisitorForEnum(JsonFormatVisitorWrapper visitor,
                                                  JavaType typeHint,
                                                  Class<?> enumType)
                                           throws JsonMappingException

Overridable helper method used for special case handling of schema information for Enums.

Returns:

True if method handled callbacks; false if not; in latter case caller will send default callbacks

Throws:

JsonMappingException

Since:

2.6

isNaturalTypeWithStdHandling

protected boolean isNaturalTypeWithStdHandling(Class<?> rawType,
                                               JsonSerializer<?> ser)

_findDynamicSerializer

protected JsonSerializer<Object> _findDynamicSerializer(SerializerProvider ctxt,
                                                        Class<?> valueClass)
                                                 throws JsonMappingException

Throws:

JsonMappingException

toString

public String toString()

Overrides:

toString in class Object