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com.fasterxml.jackson.databind.ser.std.ReferenceTypeSerializer Maven / Gradle / Ivy
General data-binding functionality for Jackson: works on core streaming API
package com.fasterxml.jackson.databind.ser.std;
import java.io.IOException;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.introspect.Annotated;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;
import com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap;
import com.fasterxml.jackson.databind.type.ReferenceType;
import com.fasterxml.jackson.databind.util.NameTransformer;
/**
* Base implementation for values of {@link ReferenceType}.
* Implements most of functionality, only leaving couple of abstract
* methods for sub-classes to implement
*
* @since 2.8
*/
public abstract class ReferenceTypeSerializer
extends StdSerializer
implements ContextualSerializer
{
private static final long serialVersionUID = 1L;
/**
* Value type
*/
protected final JavaType _referredType;
protected final BeanProperty _property;
/**
* Type serializer used for values, if any.
*/
protected final TypeSerializer _valueTypeSerializer;
/**
* Serializer for content values, if statically known.
*/
protected final JsonSerializer _valueSerializer;
/**
* In case of unwrapping, need name transformer.
*/
protected final NameTransformer _unwrapper;
/**
* Further guidance on serialization-inclusion (or not), regarding
* contained value (if any).
*/
protected final JsonInclude.Include _contentInclusion;
/**
* If element type can not be statically determined, mapping from
* runtime type to serializer is handled using this object
*/
protected transient PropertySerializerMap _dynamicSerializers;
/*
/**********************************************************
/* Constructors, factory methods
/**********************************************************
*/
public ReferenceTypeSerializer(ReferenceType fullType, boolean staticTyping,
TypeSerializer vts, JsonSerializer ser)
{
super(fullType);
_referredType = fullType.getReferencedType();
_property = null;
_valueTypeSerializer = vts;
_valueSerializer = ser;
_unwrapper = null;
_contentInclusion = null;
_dynamicSerializers = PropertySerializerMap.emptyForProperties();
}
@SuppressWarnings("unchecked")
protected ReferenceTypeSerializer(ReferenceTypeSerializer base, BeanProperty property,
TypeSerializer vts, JsonSerializer valueSer,
NameTransformer unwrapper,
JsonInclude.Include contentIncl)
{
super(base);
_referredType = base._referredType;
_dynamicSerializers = base._dynamicSerializers;
_property = property;
_valueTypeSerializer = vts;
_valueSerializer = (JsonSerializer) valueSer;
_unwrapper = unwrapper;
if ((contentIncl == JsonInclude.Include.USE_DEFAULTS)
|| (contentIncl == JsonInclude.Include.ALWAYS)) {
_contentInclusion = null;
} else {
_contentInclusion = contentIncl;
}
}
@Override
public JsonSerializer unwrappingSerializer(NameTransformer transformer) {
JsonSerializer ser = _valueSerializer;
if (ser != null) {
ser = ser.unwrappingSerializer(transformer);
}
NameTransformer unwrapper = (_unwrapper == null) ? transformer
: NameTransformer.chainedTransformer(transformer, _unwrapper);
return withResolved(_property, _valueTypeSerializer, ser, unwrapper, _contentInclusion);
}
/*
/**********************************************************
/* Abstract methods to implement
/**********************************************************
*/
protected abstract ReferenceTypeSerializer withResolved(BeanProperty prop,
TypeSerializer vts, JsonSerializer valueSer,
NameTransformer unwrapper,
JsonInclude.Include contentIncl);
protected abstract boolean _isValueEmpty(T value);
protected abstract Object _getReferenced(T value);
protected abstract Object _getReferencedIfPresent(T value);
/*
/**********************************************************
/* Contextualization (support for property annotations)
/**********************************************************
*/
@Override
public JsonSerializer createContextual(SerializerProvider provider,
BeanProperty property) throws JsonMappingException
{
TypeSerializer typeSer = _valueTypeSerializer;
if (typeSer != null) {
typeSer = typeSer.forProperty(property);
}
// First: do we have an annotation override from property?
JsonSerializer ser = findAnnotatedContentSerializer(provider, property);;
if (ser == null) {
// If not, use whatever was configured by type
ser = _valueSerializer;
if (ser == null) {
// A few conditions needed to be able to fetch serializer here:
if (_useStatic(provider, property, _referredType)) {
ser = _findSerializer(provider, _referredType, property);
}
} else {
ser = provider.handlePrimaryContextualization(ser, property);
}
}
// Also: may want to have more refined exclusion based on referenced value
JsonInclude.Include contentIncl = _contentInclusion;
JsonInclude.Value incl = findIncludeOverrides(provider, property, handledType());
JsonInclude.Include newIncl = incl.getContentInclusion();
if ((newIncl != contentIncl) && (newIncl != JsonInclude.Include.USE_DEFAULTS)) {
contentIncl = newIncl;
}
return withResolved(property, typeSer, ser, _unwrapper, contentIncl);
}
protected boolean _useStatic(SerializerProvider provider, BeanProperty property,
JavaType referredType)
{
// First: no serializer for `Object.class`, must be dynamic
if (referredType.isJavaLangObject()) {
return false;
}
// but if type is final, might as well fetch
if (referredType.isFinal()) { // or should we allow annotation override? (only if requested...)
return true;
}
// also: if indicated by typing, should be considered static
if (referredType.useStaticType()) {
return true;
}
// if neither, maybe explicit annotation?
AnnotationIntrospector intr = provider.getAnnotationIntrospector();
if ((intr != null) && (property != null)) {
Annotated ann = property.getMember();
if (ann != null) {
JsonSerialize.Typing t = intr.findSerializationTyping(property.getMember());
if (t == JsonSerialize.Typing.STATIC) {
return true;
}
if (t == JsonSerialize.Typing.DYNAMIC) {
return false;
}
}
}
// and finally, may be forced by global static typing (unlikely...)
return provider.isEnabled(MapperFeature.USE_STATIC_TYPING);
}
/*
/**********************************************************
/* Accessors
/**********************************************************
*/
@Override
public boolean isEmpty(SerializerProvider provider, T value)
{
if ((value == null) || _isValueEmpty(value)) {
return true;
}
if (_contentInclusion == null) {
return false;
}
Object contents = _getReferenced(value);
JsonSerializer ser = _valueSerializer;
if (ser == null) {
try {
ser = _findCachedSerializer(provider, contents.getClass());
} catch (JsonMappingException e) { // nasty but necessary
throw new RuntimeJsonMappingException(e);
}
}
return ser.isEmpty(provider, contents);
}
@Override
public boolean isUnwrappingSerializer() {
return (_unwrapper != null);
}
/*
/**********************************************************
/* Serialization methods
/**********************************************************
*/
@Override
public void serialize(T ref, JsonGenerator g, SerializerProvider provider)
throws IOException
{
Object value = _getReferencedIfPresent(ref);
if (value == null) {
if (_unwrapper == null) {
provider.defaultSerializeNull(g);
}
return;
}
JsonSerializer ser = _valueSerializer;
if (ser == null) {
ser = _findCachedSerializer(provider, value.getClass());
}
if (_valueTypeSerializer != null) {
ser.serializeWithType(value, g, provider, _valueTypeSerializer);
} else {
ser.serialize(value, g, provider);
}
}
@Override
public void serializeWithType(T ref,
JsonGenerator g, SerializerProvider provider,
TypeSerializer typeSer) throws IOException
{
Object value = _getReferencedIfPresent(ref);
if (value == null) {
if (_unwrapper == null) {
provider.defaultSerializeNull(g);
}
return;
}
// 19-Apr-2016, tatu: In order to basically "skip" the whole wrapper level
// (which is what non-polymorphic serialization does too), we will need
// to simply delegate call, I think, and NOT try to use it here.
// Otherwise apply type-prefix/suffix, then std serialize:
/*
typeSer.writeTypePrefixForScalar(ref, g);
serialize(ref, g, provider);
typeSer.writeTypeSuffixForScalar(ref, g);
*/
JsonSerializer ser = _valueSerializer;
if (ser == null) {
ser = _findCachedSerializer(provider, value.getClass());
}
ser.serializeWithType(value, g, provider, typeSer);
}
/*
/**********************************************************
/* Introspection support
/**********************************************************
*/
@Override
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint)
throws JsonMappingException
{
JsonSerializer ser = _valueSerializer;
if (ser == null) {
ser = _findSerializer(visitor.getProvider(), _referredType, _property);
if (_unwrapper != null) {
ser = ser.unwrappingSerializer(_unwrapper);
}
}
ser.acceptJsonFormatVisitor(visitor, _referredType);
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
/**
* Helper method that encapsulates logic of retrieving and caching required
* serializer.
*/
private final JsonSerializer _findCachedSerializer(SerializerProvider provider,
Class type) throws JsonMappingException
{
JsonSerializer ser = _dynamicSerializers.serializerFor(type);
if (ser == null) {
ser = _findSerializer(provider, type, _property);
if (_unwrapper != null) {
ser = ser.unwrappingSerializer(_unwrapper);
}
_dynamicSerializers = _dynamicSerializers.newWith(type, ser);
}
return ser;
}
private final JsonSerializer _findSerializer(SerializerProvider provider,
Class type, BeanProperty prop) throws JsonMappingException
{
// 13-Mar-2017, tatu: Used to call `findTypeValueSerializer()`, but contextualization
// not working for that case for some reason
// return provider.findTypedValueSerializer(type, true, prop);
return provider.findValueSerializer(type, prop);
}
private final JsonSerializer _findSerializer(SerializerProvider provider,
JavaType type, BeanProperty prop) throws JsonMappingException
{
// 13-Mar-2017, tatu: Used to call `findTypeValueSerializer()`, but contextualization
// not working for that case for some reason
// return provider.findTypedValueSerializer(type, true, prop);
return provider.findValueSerializer(type, prop);
}
}
