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com.fasterxml.jackson.databind.ser.impl.UnwrappingBeanPropertyWriter Maven / Gradle / Ivy
package com.fasterxml.jackson.databind.ser.impl;
import java.util.Iterator;
import java.util.Map.Entry;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.io.SerializedString;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonObjectFormatVisitor;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.ser.BeanPropertyWriter;
import com.fasterxml.jackson.databind.util.NameTransformer;
/**
* Variant of {@link BeanPropertyWriter} which will handle unwrapping
* of JSON Object (including of properties of Object within surrounding
* JSON object, and not as sub-object).
*/
public class UnwrappingBeanPropertyWriter
extends BeanPropertyWriter
implements java.io.Serializable
{
private static final long serialVersionUID = 1L;
/**
* Transformer used to add prefix and/or suffix for properties
* of unwrapped POJO.
*/
protected final NameTransformer _nameTransformer;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
public UnwrappingBeanPropertyWriter(BeanPropertyWriter base, NameTransformer unwrapper) {
super(base);
_nameTransformer = unwrapper;
}
protected UnwrappingBeanPropertyWriter(UnwrappingBeanPropertyWriter base, NameTransformer transformer,
SerializedString name) {
super(base, name);
_nameTransformer = transformer;
}
@Override
public UnwrappingBeanPropertyWriter rename(NameTransformer transformer)
{
String oldName = _name.getValue();
String newName = transformer.transform(oldName);
// important: combine transformers:
transformer = NameTransformer.chainedTransformer(transformer, _nameTransformer);
return _new(transformer, new SerializedString(newName));
}
/**
* Overridable factory method used by sub-classes
*
* @since 2.6.0
*/
protected UnwrappingBeanPropertyWriter _new(NameTransformer transformer, SerializedString newName)
{
return new UnwrappingBeanPropertyWriter(this, transformer, newName);
}
/*
/**********************************************************
/* Overrides, public methods
/**********************************************************
*/
@Override
public boolean isUnwrapping() {
return true;
}
@Override
public void serializeAsField(Object bean, JsonGenerator gen, SerializerProvider prov)
throws Exception
{
final Object value = get(bean);
if (value == null) {
// Hmmh. I assume we MUST pretty much suppress nulls, since we
// can't really unwrap them...
return;
}
JsonSerializer ser = _serializer;
if (ser == null) {
Class cls = value.getClass();
PropertySerializerMap map = _dynamicSerializers;
ser = map.serializerFor(cls);
if (ser == null) {
ser = _findAndAddDynamic(map, cls, prov);
}
}
if (_suppressableValue != null) {
if (MARKER_FOR_EMPTY == _suppressableValue) {
if (ser.isEmpty(prov, value)) {
return;
}
} else if (_suppressableValue.equals(value)) {
return;
}
}
// For non-nulls, first: simple check for direct cycles
if (value == bean) {
if (_handleSelfReference(bean, gen, prov, ser)) {
return;
}
}
// note: must verify we are using unwrapping serializer; if not, will write field name
if (!ser.isUnwrappingSerializer()) {
gen.writeFieldName(_name);
}
if (_typeSerializer == null) {
ser.serialize(value, gen, prov);
} else {
ser.serializeWithType(value, gen, prov, _typeSerializer);
}
}
// need to override as we must get unwrapping instance...
@Override
public void assignSerializer(JsonSerializer ser)
{
if (ser != null) {
NameTransformer t = _nameTransformer;
if (ser.isUnwrappingSerializer()) {
t = NameTransformer.chainedTransformer(t, ((UnwrappingBeanSerializer) ser)._nameTransformer);
}
ser = ser.unwrappingSerializer(t);
}
super.assignSerializer(ser);
}
/*
/**********************************************************
/* Overrides: schema generation
/**********************************************************
*/
@Override
public void depositSchemaProperty(final JsonObjectFormatVisitor visitor,
SerializerProvider provider) throws JsonMappingException
{
JsonSerializer ser = provider
.findValueSerializer(this.getType(), this)
.unwrappingSerializer(_nameTransformer);
if (ser.isUnwrappingSerializer()) {
ser.acceptJsonFormatVisitor(new JsonFormatVisitorWrapper.Base(provider) {
// an unwrapping serializer will always expect ObjectFormat,
// hence, the other cases do not have to be implemented
@Override
public JsonObjectFormatVisitor expectObjectFormat(JavaType type)
throws JsonMappingException {
return visitor;
}
}, this.getType());
} else {
super.depositSchemaProperty(visitor, provider);
}
}
// Override needed to support legacy JSON Schema generator
@Override
protected void _depositSchemaProperty(ObjectNode propertiesNode, JsonNode schemaNode)
{
JsonNode props = schemaNode.get("properties");
if (props != null) {
Iterator> it = props.fields();
while (it.hasNext()) {
Entry entry = it.next();
String name = entry.getKey();
if (_nameTransformer != null) {
name = _nameTransformer.transform(name);
}
propertiesNode.set(name, entry.getValue());
}
}
}
/*
/**********************************************************
/* Overrides: internal, other
/**********************************************************
*/
// need to override as we must get unwrapping instance...
@Override
protected JsonSerializer _findAndAddDynamic(PropertySerializerMap map,
Class type, SerializerProvider provider) throws JsonMappingException
{
JsonSerializer serializer;
if (_nonTrivialBaseType != null) {
JavaType subtype = provider.constructSpecializedType(_nonTrivialBaseType, type);
serializer = provider.findValueSerializer(subtype, this);
} else {
serializer = provider.findValueSerializer(type, this);
}
NameTransformer t = _nameTransformer;
if (serializer.isUnwrappingSerializer()) {
t = NameTransformer.chainedTransformer(t, ((UnwrappingBeanSerializer) serializer)._nameTransformer);
}
serializer = serializer.unwrappingSerializer(t);
_dynamicSerializers = _dynamicSerializers.newWith(type, serializer);
return serializer;
}
}
