package com.fasterxml.jackson.databind.module;
import java.util.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.Serializers;
import com.fasterxml.jackson.databind.type.ArrayType;
import com.fasterxml.jackson.databind.type.ClassKey;
import com.fasterxml.jackson.databind.type.CollectionLikeType;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.fasterxml.jackson.databind.type.MapLikeType;
import com.fasterxml.jackson.databind.type.MapType;
/**
* Simple implementation {@link Serializers} which allows registration of
* serializers based on raw (type erased class).
* It can work well for basic bean and scalar type serializers, but is not
* a good fit for handling generic types (like {@link Map}s and {@link Collection}s).
*<p>
* Type registrations are assumed to be general; meaning that registration of serializer
* for a super type will also be used for handling subtypes, unless an exact match
* is found first. As an example, handler for {@link CharSequence} would also be used
* serializing {@link StringBuilder} instances, unless a direct mapping was found.
*/
public class SimpleSerializers extends Serializers.Base
{
/**
* Class-based mappings that are used both for exact and
* sub-class matches.
*/
protected HashMap<ClassKey,JsonSerializer<?>> _classMappings = null;
/**
* Interface-based matches.
*/
protected HashMap<ClassKey,JsonSerializer<?>> _interfaceMappings = null;
/*
/**********************************************************
/* Life-cycle, construction and configuring
/**********************************************************
*/
public SimpleSerializers() { }
/**
* Method for adding given serializer for type that {@link JsonSerializer#handledType}
* specifies (which MUST return a non-null class; and can NOT be {@link Object}, as a
* sanity check).
* For serializers that do not declare handled type, use the variant that takes
* two arguments.
*
* @param ser
*/
public void addSerializer(JsonSerializer<?> ser)
{
// Interface to match?
Class<?> cls = ser.handledType();
if (cls == null || cls == Object.class) {
throw new IllegalArgumentException("JsonSerializer of type "+ser.getClass().getName()
+" does not define valid handledType() -- must either register with method that takes type argument "
+" or make serializer extend 'com.fasterxml.jackson.databind.ser.std.StdSerializer'");
}
_addSerializer(cls, ser);
}
public <T> void addSerializer(Class<? extends T> type, JsonSerializer<T> ser)
{
_addSerializer(type, ser);
}
private void _addSerializer(Class<?> cls, JsonSerializer<?> ser)
{
ClassKey key = new ClassKey(cls);
// Interface or class type?
if (cls.isInterface()) {
if (_interfaceMappings == null) {
_interfaceMappings = new HashMap<ClassKey,JsonSerializer<?>>();
}
_interfaceMappings.put(key, ser);
} else { // nope, class:
if (_classMappings == null) {
_classMappings = new HashMap<ClassKey,JsonSerializer<?>>();
}
_classMappings.put(key, ser);
}
}
/*
/**********************************************************
/* Serializers implementation
/**********************************************************
*/
@Override
public JsonSerializer<?> findSerializer(SerializationConfig config,
JavaType type, BeanDescription beanDesc)
{
Class<?> cls = type.getRawClass();
ClassKey key = new ClassKey(cls);
JsonSerializer<?> ser = null;
// First: direct match?
if (cls.isInterface()) {
if (_interfaceMappings != null) {
ser = _interfaceMappings.get(key);
if (ser != null) {
return ser;
}
}
} else {
if (_classMappings != null) {
ser = _classMappings.get(key);
if (ser != null) {
return ser;
}
// If not direct match, maybe super-class match?
for (Class<?> curr = cls; (curr != null); curr = curr.getSuperclass()) {
key.reset(curr);
ser = _classMappings.get(key);
if (ser != null) {
return ser;
}
}
}
}
// No direct match? How about super-interfaces?
if (_interfaceMappings != null) {
ser = _findInterfaceMapping(cls, key);
if (ser != null) {
return ser;
}
// still no matches? Maybe interfaces of super classes
if (!cls.isInterface()) {
while ((cls = cls.getSuperclass()) != null) {
ser = _findInterfaceMapping(cls, key);
if (ser != null) {
return ser;
}
}
}
}
return null;
}
@Override
public JsonSerializer<?> findArraySerializer(SerializationConfig config,
ArrayType type, BeanDescription beanDesc,
TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer) {
return findSerializer(config, type, beanDesc);
}
@Override
public JsonSerializer<?> findCollectionSerializer(SerializationConfig config,
CollectionType type, BeanDescription beanDesc,
TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer) {
return findSerializer(config, type, beanDesc);
}
@Override
public JsonSerializer<?> findCollectionLikeSerializer(SerializationConfig config,
CollectionLikeType type, BeanDescription beanDesc,
TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer) {
return findSerializer(config, type, beanDesc);
}
@Override
public JsonSerializer<?> findMapSerializer(SerializationConfig config,
MapType type, BeanDescription beanDesc,
JsonSerializer<Object> keySerializer,
TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer) {
return findSerializer(config, type, beanDesc);
}
@Override
public JsonSerializer<?> findMapLikeSerializer(SerializationConfig config,
MapLikeType type, BeanDescription beanDesc,
JsonSerializer<Object> keySerializer,
TypeSerializer elementTypeSerializer, JsonSerializer<Object> elementValueSerializer) {
return findSerializer(config, type, beanDesc);
}
/*
/**********************************************************
/* Internal methods
/**********************************************************
*/
protected JsonSerializer<?> _findInterfaceMapping(Class<?> cls, ClassKey key)
{
for (Class<?> iface : cls.getInterfaces()) {
key.reset(iface);
JsonSerializer<?> ser = _interfaceMappings.get(key);
if (ser != null) {
return ser;
}
ser = _findInterfaceMapping(iface, key);
if (ser != null) {
return ser;
}
}
return null;
}
}