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.
*
* @author tatu
*/
public class AsWrapperTypeSerializer
extends TypeSerializerBase
{
public AsWrapperTypeSerializer(TypeIdResolver idRes, BeanProperty property)
{
super(idRes, property);
}
@Override
public AsWrapperTypeSerializer forProperty(BeanProperty prop) {
if (_property == prop) return this;
return new AsWrapperTypeSerializer(this._idResolver, prop);
}
@Override
public As getTypeInclusion() { return As.WRAPPER_OBJECT; }
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
// wrapper
jgen.writeStartObject();
// and then JSON Object start caller wants
jgen.writeObjectFieldStart(idFromValue(value));
}
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen,
Class<?> type)
throws IOException, JsonProcessingException
{
// wrapper
jgen.writeStartObject();
// and then JSON Object start caller wants
jgen.writeObjectFieldStart(idFromValueAndType(value, type));
}
@Override
public void writeTypePrefixForArray(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
// can still wrap ok
jgen.writeStartObject();
// and then JSON Array start caller wants
jgen.writeArrayFieldStart(idFromValue(value));
}
@Override
public void writeTypePrefixForArray(Object value, JsonGenerator jgen,
Class<?> type)
throws IOException, JsonProcessingException
{
// can still wrap ok
jgen.writeStartObject();
// and then JSON Array start caller wants
jgen.writeArrayFieldStart(idFromValueAndType(value, type));
}
@Override
public void writeTypePrefixForScalar(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
// can still wrap ok
jgen.writeStartObject();
jgen.writeFieldName(idFromValue(value));
}
@Override
public void writeTypePrefixForScalar(Object value, JsonGenerator jgen,
Class<?> type)
throws IOException, JsonProcessingException
{
// can still wrap ok
jgen.writeStartObject();
jgen.writeFieldName(idFromValueAndType(value, type));
}
@Override
public void writeTypeSuffixForObject(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
// first close JSON Object caller used
jgen.writeEndObject();
// and then wrapper
jgen.writeEndObject();
}
@Override
public void writeTypeSuffixForArray(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
// first close array caller needed
jgen.writeEndArray();
// then wrapper object
jgen.writeEndObject();
}
@Override
public void writeTypeSuffixForScalar(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
// 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, JsonProcessingException
{
jgen.writeStartObject();
jgen.writeObjectFieldStart(typeId);
}
@Override
public void writeCustomTypePrefixForArray(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException
{
jgen.writeStartObject();
jgen.writeArrayFieldStart(typeId);
}
@Override
public void writeCustomTypePrefixForScalar(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException
{
jgen.writeStartObject();
jgen.writeFieldName(typeId);
}
@Override
public void writeCustomTypeSuffixForObject(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
writeTypeSuffixForObject(value, jgen); // standard impl works fine
}
@Override
public void writeCustomTypeSuffixForArray(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
writeTypeSuffixForArray(value, jgen); // standard impl works fine
}
@Override
public void writeCustomTypeSuffixForScalar(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
writeTypeSuffixForScalar(value, jgen); // standard impl works fine
}
}