JsonValueSerializer.java
package com.fasterxml.jackson.databind.ser.std;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;
import java.util.LinkedHashSet;
import java.util.Set;
import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
import com.fasterxml.jackson.databind.introspect.AnnotatedMember;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitable;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonStringFormatVisitor;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.BeanSerializer;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap;
import com.fasterxml.jackson.databind.util.ClassUtil;
/**
* Serializer class that can serialize Object that have a
* {@link com.fasterxml.jackson.annotation.JsonValue} annotation to
* indicate that serialization should be done by calling the method
* annotated, and serializing result it returns.
*<p>
* Implementation note: we will post-process resulting serializer
* (much like what is done with {@link BeanSerializer})
* to figure out actual serializers for final types.
* This must be done from {@link #createContextual} method, and NOT from constructor;
* otherwise we could end up with an infinite loop.
*/
@SuppressWarnings("serial")
@JacksonStdImpl
public class JsonValueSerializer
extends StdSerializer<Object>
implements ContextualSerializer, JsonFormatVisitable
{
/**
* @since 2.9
*/
protected final AnnotatedMember _accessor;
/**
* @since 2.12
*/
protected final TypeSerializer _valueTypeSerializer;
protected final JsonSerializer<Object> _valueSerializer;
protected final BeanProperty _property;
/**
* Declared type of the value accessed, as declared by accessor.
*
* @since 2.12
*/
protected final JavaType _valueType;
/**
* 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 final boolean _forceTypeInformation;
/**
* If value type cannot be statically determined, mapping from
* runtime value types to serializers are cached in this object.
*
* @since 2.12
*/
protected transient PropertySerializerMap _dynamicSerializers;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
/**
* @param ser Explicit serializer to use, if caller knows it (which
* occurs if and only if the "value method" was annotated with
* {@link com.fasterxml.jackson.databind.annotation.JsonSerialize#using}), otherwise
* null
*
* @since 2.12 added {@link TypeSerializer} since 2.11
*/
@SuppressWarnings("unchecked")
public JsonValueSerializer(AnnotatedMember accessor,
TypeSerializer vts, JsonSerializer<?> ser)
{
super(accessor.getType());
_accessor = accessor;
_valueType = accessor.getType();
_valueTypeSerializer = vts;
_valueSerializer = (JsonSerializer<Object>) ser;
_property = null;
_forceTypeInformation = true; // gets reconsidered when we are contextualized
_dynamicSerializers = PropertySerializerMap.emptyForProperties();
}
/**
* @deprecated Since 2.12
*/
@Deprecated
public JsonValueSerializer(AnnotatedMember accessor, JsonSerializer<?> ser) {
this(accessor, null, ser);
}
// @since 2.12
@SuppressWarnings("unchecked")
public JsonValueSerializer(JsonValueSerializer src, BeanProperty property,
TypeSerializer vts, JsonSerializer<?> ser, boolean forceTypeInfo)
{
super(_notNullClass(src.handledType()));
_accessor = src._accessor;
_valueType = src._valueType;
_valueTypeSerializer = vts;
_valueSerializer = (JsonSerializer<Object>) ser;
_property = property;
_forceTypeInformation = forceTypeInfo;
_dynamicSerializers = PropertySerializerMap.emptyForProperties();
}
@SuppressWarnings("unchecked")
private final static Class<Object> _notNullClass(Class<?> cls) {
return (cls == null) ? Object.class : (Class<Object>) cls;
}
protected JsonValueSerializer withResolved(BeanProperty property,
TypeSerializer vts, JsonSerializer<?> ser, boolean forceTypeInfo)
{
if ((_property == property)
&& (_valueTypeSerializer == vts) && (_valueSerializer == ser)
&& (forceTypeInfo == _forceTypeInformation)) {
return this;
}
return new JsonValueSerializer(this, property, vts, ser, forceTypeInfo);
}
/*
/**********************************************************
/* Overrides
/**********************************************************
*/
@Override // since 2.12
public boolean isEmpty(SerializerProvider ctxt, Object bean)
{
// 31-Oct-2020, tatu: Should perhaps catch access issue here... ?
Object referenced = _accessor.getValue(bean);
if (referenced == null) {
return true;
}
JsonSerializer<Object> ser = _valueSerializer;
if (ser == null) {
try {
ser = _findDynamicSerializer(ctxt, referenced.getClass());
} catch (JsonMappingException e) {
throw new RuntimeJsonMappingException(e);
}
}
return ser.isEmpty(ctxt, referenced);
}
/*
/**********************************************************
/* Post-processing
/**********************************************************
*/
/**
* We can try to find the actual serializer for value, if we can
* statically figure out what the result type must be.
*/
@Override
public JsonSerializer<?> createContextual(SerializerProvider ctxt,
BeanProperty property)
throws JsonMappingException
{
TypeSerializer typeSer = _valueTypeSerializer;
if (typeSer != null) {
typeSer = typeSer.forProperty(property);
}
JsonSerializer<?> ser = _valueSerializer;
if (ser == null) {
// Can only assign serializer statically if the declared type is final:
// if not, we don't really know the actual type until we get the instance.
// 10-Mar-2010, tatu: Except if static typing is to be used
if (ctxt.isEnabled(MapperFeature.USE_STATIC_TYPING) || _valueType.isFinal()) {
/* 10-Mar-2010, tatu: Ideally we would actually separate out type
* serializer from value serializer; but, alas, there's no access
* to serializer factory at this point...
*/
// 05-Sep-2013, tatu: I _think_ this can be considered a primary property...
ser = ctxt.findPrimaryPropertySerializer(_valueType, property);
/* 09-Dec-2010, tatu: Turns out we must add special handling for
* cases where "native" (aka "natural") type is being serialized,
* using standard serializer
*/
boolean forceTypeInformation = isNaturalTypeWithStdHandling(_valueType.getRawClass(), ser);
return withResolved(property, typeSer, ser, forceTypeInformation);
}
// [databind#2822]: better hold on to "property", regardless
if (property != _property) {
return withResolved(property, typeSer, ser, _forceTypeInformation);
}
} else {
// 05-Sep-2013, tatu: I _think_ this can be considered a primary property...
ser = ctxt.handlePrimaryContextualization(ser, property);
return withResolved(property, typeSer, ser, _forceTypeInformation);
}
return this;
}
/*
/**********************************************************
/* Actual serialization
/**********************************************************
*/
@Override
public void serialize(Object bean, JsonGenerator gen, SerializerProvider ctxt) throws IOException
{
Object value;
try {
value = _accessor.getValue(bean);
} catch (Exception e) {
value = null;
wrapAndThrow(ctxt, e, bean, _accessor.getName() + "()");
}
if (value == null) {
ctxt.defaultSerializeNull(gen);
} else {
JsonSerializer<Object> ser = _valueSerializer;
if (ser == null) {
ser = _findDynamicSerializer(ctxt, value.getClass());
}
if (_valueTypeSerializer != null) {
ser.serializeWithType(value, gen, ctxt, _valueTypeSerializer);
} else {
ser.serialize(value, gen, ctxt);
}
}
}
@Override
public void serializeWithType(Object bean, JsonGenerator gen, SerializerProvider ctxt,
TypeSerializer typeSer0) throws IOException
{
// Regardless of other parts, first need to find value to serialize:
Object value;
try {
value = _accessor.getValue(bean);
} catch (Exception e) {
value = null;
wrapAndThrow(ctxt, e, bean, _accessor.getName() + "()");
}
// and if we got null, can also just write it directly
if (value == null) {
ctxt.defaultSerializeNull(gen);
return;
}
JsonSerializer<Object> ser = _valueSerializer;
if (ser == null) { // no serializer yet? Need to fetch
ser = _findDynamicSerializer(ctxt, value.getClass());
} else {
// 09-Dec-2010, tatu: To work around natural type's refusal to add type info, we do
// this (note: type is for the wrapper type, not enclosed value!)
if (_forceTypeInformation) {
// Confusing? Type id is for POJO and NOT for value returned by JsonValue accessor...
WritableTypeId typeIdDef = typeSer0.writeTypePrefix(gen,
typeSer0.typeId(bean, JsonToken.VALUE_STRING));
ser.serialize(value, gen, ctxt);
typeSer0.writeTypeSuffix(gen, typeIdDef);
return;
}
}
// 28-Sep-2016, tatu: As per [databind#1385], we do need to do some juggling
// to use different Object for type id (logical type) and actual serialization
// (delegate type).
TypeSerializerRerouter rr = new TypeSerializerRerouter(typeSer0, bean);
ser.serializeWithType(value, gen, ctxt, rr);
}
/*
/**********************************************************
/* Schema generation
/**********************************************************
*/
/**
* @deprecated Since 2.15
*/
@Deprecated
@Override
public JsonNode getSchema(SerializerProvider ctxt, Type typeHint)
throws JsonMappingException
{
if (_valueSerializer instanceof com.fasterxml.jackson.databind.jsonschema.SchemaAware) {
return ((com.fasterxml.jackson.databind.jsonschema.SchemaAware) _valueSerializer)
.getSchema(ctxt, null);
}
return com.fasterxml.jackson.databind.jsonschema.JsonSchema.getDefaultSchemaNode();
}
@Override
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)
throws JsonMappingException
{
/* 27-Apr-2015, tatu: First things first; for JSON Schema introspection,
* Enum types that use `@JsonValue` are special (but NOT necessarily
* anything else that RETURNS an enum!)
* So we will need to add special
* handling here (see https://github.com/FasterXML/jackson-module-jsonSchema/issues/57
* for details).
*
* Note that meaning of JsonValue, then, is very different for Enums. Sigh.
*/
Class<?> declaring = _accessor.getDeclaringClass();
if ((declaring != null) && ClassUtil.isEnumType(declaring)) {
if (_acceptJsonFormatVisitorForEnum(visitor, typeHint, declaring)) {
return;
}
}
JsonSerializer<Object> ser = _valueSerializer;
if (ser == null) {
ser = visitor.getProvider().findTypedValueSerializer(_valueType, false, _property);
if (ser == null) { // can this ever occur?
visitor.expectAnyFormat(typeHint);
return;
}
}
ser.acceptJsonFormatVisitor(visitor, _valueType);
}
/**
* Overridable helper method used for special case handling of schema information for
* Enums.
*
* @return True if method handled callbacks; false if not; in latter case caller will
* send default callbacks
*
* @since 2.6
*/
protected boolean _acceptJsonFormatVisitorForEnum(JsonFormatVisitorWrapper visitor,
JavaType typeHint, Class<?> enumType)
throws JsonMappingException
{
// Copied from EnumSerializer#acceptJsonFormatVisitor
JsonStringFormatVisitor stringVisitor = visitor.expectStringFormat(typeHint);
if (stringVisitor != null) {
Set<String> enums = new LinkedHashSet<String>();
for (Object en : enumType.getEnumConstants()) {
try {
// 21-Apr-2016, tatu: This is convoluted to the max, but essentially we
// call `@JsonValue`-annotated accessor method on all Enum members,
// so it all "works out". To some degree.
enums.add(String.valueOf(_accessor.getValue(en)));
} catch (Exception e) {
Throwable t = e;
while (t instanceof InvocationTargetException && t.getCause() != null) {
t = t.getCause();
}
ClassUtil.throwIfError(t);
throw JsonMappingException.wrapWithPath(t, en, _accessor.getName() + "()");
}
}
stringVisitor.enumTypes(enums);
}
return true;
}
/*
/**********************************************************
/* Other internal helper methods
/**********************************************************
*/
protected boolean isNaturalTypeWithStdHandling(Class<?> rawType, JsonSerializer<?> ser)
{
// First: do we have a natural type being handled?
if (rawType.isPrimitive()) {
if (rawType != Integer.TYPE && rawType != Boolean.TYPE && rawType != Double.TYPE) {
return false;
}
} else {
if (rawType != String.class &&
rawType != Integer.class && rawType != Boolean.class && rawType != Double.class) {
return false;
}
}
return isDefaultSerializer(ser);
}
// @since 2.12
protected JsonSerializer<Object> _findDynamicSerializer(SerializerProvider ctxt,
Class<?> valueClass) throws JsonMappingException
{
JsonSerializer<Object> serializer = _dynamicSerializers.serializerFor(valueClass);
if (serializer == null) {
if (_valueType.hasGenericTypes()) {
final JavaType fullType = ctxt.constructSpecializedType(_valueType, valueClass);
serializer = ctxt.findPrimaryPropertySerializer(fullType, _property);
PropertySerializerMap.SerializerAndMapResult result = _dynamicSerializers.addSerializer(fullType, serializer);
_dynamicSerializers = result.map;
} else {
serializer = ctxt.findPrimaryPropertySerializer(valueClass, _property);
PropertySerializerMap.SerializerAndMapResult result = _dynamicSerializers.addSerializer(valueClass, serializer);
_dynamicSerializers = result.map;
}
}
return serializer;
/*
if (_valueType.hasGenericTypes()) {
JavaType fullType = ctxt.constructSpecializedType(_valueType, valueClass);
// 31-Oct-2020, tatu: Should not get typed/root serializer, but for now has to do:
serializer = ctxt.findTypedValueSerializer(fullType, false, _property);
PropertySerializerMap.SerializerAndMapResult result = _dynamicSerializers.addSerializer(fullType, serializer);
// did we get a new map of serializers? If so, start using it
_dynamicSerializers = result.map;
return serializer;
} else {
// 31-Oct-2020, tatu: Should not get typed/root serializer, but for now has to do:
serializer = ctxt.findTypedValueSerializer(valueClass, false, _property);
PropertySerializerMap.SerializerAndMapResult result = _dynamicSerializers.addSerializer(valueClass, serializer);
// did we get a new map of serializers? If so, start using it
_dynamicSerializers = result.map;
return serializer;
}
*/
}
/*
/**********************************************************
/* Standard method overrides
/**********************************************************
*/
@Override
public String toString() {
return "(@JsonValue serializer for method " + _accessor.getDeclaringClass() + "#" + _accessor.getName() + ")";
}
/*
/**********************************************************
/* Helper class
/**********************************************************
*/
/**
* Silly little wrapper class we need to re-route type serialization so that we can
* override Object to use for type id (logical type) even when asking serialization
* of something else (delegate type)
*/
static class TypeSerializerRerouter
extends TypeSerializer
{
protected final TypeSerializer _typeSerializer;
protected final Object _forObject;
public TypeSerializerRerouter(TypeSerializer ts, Object ob) {
_typeSerializer = ts;
_forObject = ob;
}
@Override
public TypeSerializer forProperty(BeanProperty prop) { // should never get called
throw new UnsupportedOperationException();
}
@Override
public As getTypeInclusion() {
return _typeSerializer.getTypeInclusion();
}
@Override
public String getPropertyName() {
return _typeSerializer.getPropertyName();
}
@Override
public TypeIdResolver getTypeIdResolver() {
return _typeSerializer.getTypeIdResolver();
}
// // // New Write API, 2.9+
@Override // since 2.9
public WritableTypeId writeTypePrefix(JsonGenerator g,
WritableTypeId typeId) throws IOException {
// 28-Jun-2017, tatu: Important! Need to "override" value
typeId.forValue = _forObject;
return _typeSerializer.writeTypePrefix(g, typeId);
}
@Override // since 2.9
public WritableTypeId writeTypeSuffix(JsonGenerator g,
WritableTypeId typeId) throws IOException {
// NOTE: already overwrote value object so:
return _typeSerializer.writeTypeSuffix(g, typeId);
}
// // // Old Write API, pre-2.9
@Override
@Deprecated
public void writeTypePrefixForScalar(Object value, JsonGenerator gen) throws IOException {
_typeSerializer.writeTypePrefixForScalar(_forObject, gen);
}
@Override
@Deprecated
public void writeTypePrefixForObject(Object value, JsonGenerator gen) throws IOException {
_typeSerializer.writeTypePrefixForObject(_forObject, gen);
}
@Override
@Deprecated
public void writeTypePrefixForArray(Object value, JsonGenerator gen) throws IOException {
_typeSerializer.writeTypePrefixForArray(_forObject, gen);
}
@Override
@Deprecated
public void writeTypeSuffixForScalar(Object value, JsonGenerator gen) throws IOException {
_typeSerializer.writeTypeSuffixForScalar(_forObject, gen);
}
@Override
@Deprecated
public void writeTypeSuffixForObject(Object value, JsonGenerator gen) throws IOException {
_typeSerializer.writeTypeSuffixForObject(_forObject, gen);
}
@Override
@Deprecated
public void writeTypeSuffixForArray(Object value, JsonGenerator gen) throws IOException {
_typeSerializer.writeTypeSuffixForArray(_forObject, gen);
}
@Override
@Deprecated
public void writeTypePrefixForScalar(Object value, JsonGenerator gen, Class<?> type) throws IOException {
_typeSerializer.writeTypePrefixForScalar(_forObject, gen, type);
}
@Override
@Deprecated
public void writeTypePrefixForObject(Object value, JsonGenerator gen, Class<?> type) throws IOException {
_typeSerializer.writeTypePrefixForObject(_forObject, gen, type);
}
@Override
@Deprecated
public void writeTypePrefixForArray(Object value, JsonGenerator gen, Class<?> type) throws IOException {
_typeSerializer.writeTypePrefixForArray(_forObject, gen, type);
}
/*
/**********************************************************
/* Deprecated methods (since 2.9)
/**********************************************************
*/
@Override
@Deprecated
public void writeCustomTypePrefixForScalar(Object value, JsonGenerator gen, String typeId)
throws IOException {
_typeSerializer.writeCustomTypePrefixForScalar(_forObject, gen, typeId);
}
@Override
@Deprecated
public void writeCustomTypePrefixForObject(Object value, JsonGenerator gen, String typeId) throws IOException {
_typeSerializer.writeCustomTypePrefixForObject(_forObject, gen, typeId);
}
@Override
@Deprecated
public void writeCustomTypePrefixForArray(Object value, JsonGenerator gen, String typeId) throws IOException {
_typeSerializer.writeCustomTypePrefixForArray(_forObject, gen, typeId);
}
@Override
@Deprecated
public void writeCustomTypeSuffixForScalar(Object value, JsonGenerator gen, String typeId) throws IOException {
_typeSerializer.writeCustomTypeSuffixForScalar(_forObject, gen, typeId);
}
@Override
@Deprecated
public void writeCustomTypeSuffixForObject(Object value, JsonGenerator gen, String typeId) throws IOException {
_typeSerializer.writeCustomTypeSuffixForObject(_forObject, gen, typeId);
}
@Override
@Deprecated
public void writeCustomTypeSuffixForArray(Object value, JsonGenerator gen, String typeId) throws IOException {
_typeSerializer.writeCustomTypeSuffixForArray(_forObject, gen, typeId);
}
}
}