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package com.fasterxml.jackson.databind.jsontype.impl;
import java.io.IOException;
import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.jsontype.TypeIdResolver;
/**
* Type wrapper that tries to use an extra JSON Object, with a single
* entry that has type name as key, to serialize type information.
* If this is not possible (value is serialize as array or primitive),
* will use {@link As#WRAPPER_ARRAY} mechanism as fallback: that is,
* just use a wrapping array with type information as the first element
* and value as second.
*/
public class AsWrapperTypeSerializer extends TypeSerializerBase
{
public AsWrapperTypeSerializer(TypeIdResolver idRes, BeanProperty property) {
super(idRes, property);
}
@Override
public AsWrapperTypeSerializer forProperty(BeanProperty prop) {
return (_property == prop) ? this : new AsWrapperTypeSerializer(this._idResolver, prop);
}
@Override
public As getTypeInclusion() { return As.WRAPPER_OBJECT; }
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen) throws IOException
{
String typeId = idFromValue(value);
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
jgen.writeStartObject();
} else {
// wrapper
jgen.writeStartObject();
// and then JSON Object start caller wants
// 28-Jan-2015, tatu: No really good answer here; can not really change
// structure, so change null to empty String...
jgen.writeObjectFieldStart(_validTypeId(typeId));
}
}
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen, Class type) throws IOException
{
String typeId = idFromValueAndType(value, type);
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
jgen.writeStartObject();
} else {
// wrapper
jgen.writeStartObject();
// and then JSON Object start caller wants
// 28-Jan-2015, tatu: No really good answer here; can not really change
// structure, so change null to empty String...
jgen.writeObjectFieldStart(_validTypeId(typeId));
}
}
@Override
public void writeTypePrefixForArray(Object value, JsonGenerator jgen) throws IOException
{
String typeId = idFromValue(value);
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
jgen.writeStartArray();
} else {
// can still wrap ok
jgen.writeStartObject();
jgen.writeArrayFieldStart(_validTypeId(typeId));
}
}
@Override
public void writeTypePrefixForArray(Object value, JsonGenerator jgen, Class type) throws IOException
{
final String typeId = idFromValueAndType(value, type);
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
jgen.writeStartArray();
} else {
// can still wrap ok
jgen.writeStartObject();
// and then JSON Array start caller wants
jgen.writeArrayFieldStart(_validTypeId(typeId));
}
}
@Override
public void writeTypePrefixForScalar(Object value, JsonGenerator jgen) throws IOException {
final String typeId = idFromValue(value);
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
} else {
// can still wrap ok
jgen.writeStartObject();
jgen.writeFieldName(_validTypeId(typeId));
}
}
@Override
public void writeTypePrefixForScalar(Object value, JsonGenerator jgen, Class type) throws IOException
{
final String typeId = idFromValueAndType(value, type);
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
} else {
// can still wrap ok
jgen.writeStartObject();
jgen.writeFieldName(_validTypeId(typeId));
}
}
@Override
public void writeTypeSuffixForObject(Object value, JsonGenerator jgen) throws IOException
{
// first close JSON Object caller used
jgen.writeEndObject();
if (!jgen.canWriteTypeId()) {
// and then wrapper
jgen.writeEndObject();
}
}
@Override
public void writeTypeSuffixForArray(Object value, JsonGenerator jgen) throws IOException
{
// first close array caller needed
jgen.writeEndArray();
if (!jgen.canWriteTypeId()) {
// then wrapper object
jgen.writeEndObject();
}
}
@Override
public void writeTypeSuffixForScalar(Object value, JsonGenerator jgen) throws IOException {
if (!jgen.canWriteTypeId()) {
// just need to close the wrapper object
jgen.writeEndObject();
}
}
/*
/**********************************************************
/* Writing with custom type id
/**********************************************************
*/
@Override
public void writeCustomTypePrefixForObject(Object value, JsonGenerator jgen, String typeId) throws IOException {
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
jgen.writeStartObject();
} else {
jgen.writeStartObject();
jgen.writeObjectFieldStart(_validTypeId(typeId));
}
}
@Override
public void writeCustomTypePrefixForArray(Object value, JsonGenerator jgen, String typeId) throws IOException {
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
jgen.writeStartArray();
} else {
jgen.writeStartObject();
jgen.writeArrayFieldStart(_validTypeId(typeId));
}
}
@Override
public void writeCustomTypePrefixForScalar(Object value, JsonGenerator jgen, String typeId) throws IOException {
if (jgen.canWriteTypeId()) {
if (typeId != null) {
jgen.writeTypeId(typeId);
}
} else {
jgen.writeStartObject();
jgen.writeFieldName(_validTypeId(typeId));
}
}
@Override
public void writeCustomTypeSuffixForObject(Object value, JsonGenerator jgen, String typeId) throws IOException {
if (!jgen.canWriteTypeId()) {
writeTypeSuffixForObject(value, jgen); // standard impl works fine
}
}
@Override
public void writeCustomTypeSuffixForArray(Object value, JsonGenerator jgen, String typeId) throws IOException {
if (!jgen.canWriteTypeId()) {
writeTypeSuffixForArray(value, jgen); // standard impl works fine
}
}
@Override
public void writeCustomTypeSuffixForScalar(Object value, JsonGenerator jgen, String typeId) throws IOException {
if (!jgen.canWriteTypeId()) {
writeTypeSuffixForScalar(value, jgen); // standard impl works fine
}
}
/*
/**********************************************************
/* Internal helper methods
/**********************************************************
*/
/**
* @since 2.6.0
*/
protected String _validTypeId(String typeId) {
return (typeId == null) ? "" : typeId;
}
}
