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 serializer that preferably embeds type information as an "external"
* type property; embedded in enclosing JSON object.
* Note that this serializer should only be used when value is being output
* at JSON Object context; otherwise it can not work reliably, and will have
* to revert operation similar to {@link AsPropertyTypeSerializer}.
*<p>
* Note that implementation of serialization is bit cumbersome as we must
* serialized external type id AFTER object; this because callback only
* occurs after field name has been written.
*/
public class AsExternalTypeSerializer
extends TypeSerializerBase
{
protected final String _typePropertyName;
public AsExternalTypeSerializer(TypeIdResolver idRes, BeanProperty property,
String propName)
{
super(idRes, property);
_typePropertyName = propName;
}
@Override
public AsExternalTypeSerializer forProperty(BeanProperty prop) {
if (_property == prop) return this;
return new AsExternalTypeSerializer(this._idResolver, prop, this._typePropertyName);
}
@Override
public String getPropertyName() { return _typePropertyName; }
@Override
public As getTypeInclusion() { return As.EXTERNAL_PROPERTY; }
/*
/**********************************************************
/* Writing prefixes
/**********************************************************
*/
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen);
}
@Override
public void writeTypePrefixForObject(Object value, JsonGenerator jgen, Class<?> type)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen, type);
}
@Override
public void writeTypePrefixForArray(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen);
}
@Override
public void writeTypePrefixForArray(Object value, JsonGenerator jgen, Class<?> type)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen, type);
}
@Override
public void writeTypePrefixForScalar(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen);
}
@Override
public void writeTypePrefixForScalar(Object value, JsonGenerator jgen, Class<?> type)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen, type);
}
/*
/**********************************************************
/* Writing suffixes
/**********************************************************
*/
@Override
public void writeTypeSuffixForObject(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
_writeSuffix(value, jgen, idFromValue(value));
}
@Override
public void writeTypeSuffixForArray(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
_writeSuffix(value, jgen, idFromValue(value));
}
@Override
public void writeTypeSuffixForScalar(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
_writeSuffix(value, jgen, idFromValue(value));
}
/*
/**********************************************************
/* Writing with custom type id
/**********************************************************
*/
@Override
public void writeCustomTypePrefixForScalar(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen); // here standard works fine
}
@Override
public void writeCustomTypePrefixForObject(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
_writePrefix(value, jgen); // here standard works fine
}
@Override
public void writeCustomTypePrefixForArray(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException
{
_writePrefix(value, jgen); // here standard works fine
}
@Override
public void writeCustomTypeSuffixForScalar(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
_writeSuffix(value, jgen, typeId);// here standard works fine
}
@Override
public void writeCustomTypeSuffixForObject(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
_writeSuffix(value, jgen, typeId);// here standard works fine
}
@Override
public void writeCustomTypeSuffixForArray(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException {
_writeSuffix(value, jgen, typeId);// here standard works fine
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
protected final void _writePrefix(Object value, JsonGenerator jgen)
throws IOException, JsonProcessingException
{
jgen.writeStartObject();
}
protected final void _writePrefix(Object value, JsonGenerator jgen, Class<?> type)
throws IOException, JsonProcessingException
{
jgen.writeStartObject();
}
protected final void _writeSuffix(Object value, JsonGenerator jgen, String typeId)
throws IOException, JsonProcessingException
{
jgen.writeEndObject();
jgen.writeStringField(_typePropertyName, typeId);
}
}