BeanSerializerModifier.java
package com.fasterxml.jackson.databind.ser;
import java.util.List;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.DeserializerFactory;
import com.fasterxml.jackson.databind.type.*;
/**
* Abstract class that defines API for objects that can be registered (for {@link BeanSerializerFactory}
* to participate in constructing {@link BeanSerializer} instances.
* This is typically done by modules that want alter some aspects of serialization
* process; and is preferable to sub-classing of {@link BeanSerializerFactory}.
*<p>
* Sequence in which callback methods are called is as follows:
* <ol>
* <li>After factory has collected tentative set of properties (instances of
* <code>BeanPropertyWriter</code>) is sent for modification via
* {@link #changeProperties}. Changes can include removal, addition and
* replacement of suggested properties.
* <li>Resulting set of properties are ordered (sorted) by factory, as per
* configuration, and then {@link #orderProperties} is called to allow
* modifiers to alter ordering.
* <li>After all bean properties and related information is accumulated,
* {@link #updateBuilder} is called with builder, to allow builder state
* to be modified (including possibly replacing builder itself if necessary)
* <li>Once all bean information has been determined,
* factory creates default {@link BeanSerializer} instance and passes
* it to modifiers using {@link #modifySerializer}, for possible
* modification or replacement (by any {@link com.fasterxml.jackson.databind.JsonSerializer} instance)
* </ol>
*<p>
* Default method implementations are "no-op"s, meaning that methods are implemented
* but have no effect.
*/
public abstract class BeanSerializerModifier
{
/**
* Method called by {@link BeanSerializerFactory} with tentative set
* of discovered properties.
* Implementations can add, remove or replace any of passed properties.
*
* Properties <code>List</code> passed as argument is modifiable, and returned List must
* likewise be modifiable as it may be passed to multiple registered
* modifiers.
*/
public List<BeanPropertyWriter> changeProperties(SerializationConfig config,
BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties) {
return beanProperties;
}
/**
* Method called by {@link BeanSerializerFactory} with set of properties
* to serialize, in default ordering (based on defaults as well as
* possible type annotations).
* Implementations can change ordering any way they like.
*
* Properties <code>List</code> passed as argument is modifiable, and returned List must
* likewise be modifiable as it may be passed to multiple registered
* modifiers.
*/
public List<BeanPropertyWriter> orderProperties(SerializationConfig config,
BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties) {
return beanProperties;
}
/**
* Method called by {@link BeanSerializerFactory} after collecting all information
* regarding POJO to serialize and updating builder with it, but before constructing
* serializer.
* Implementations may choose to modify state of builder (to affect serializer being
* built), or even completely replace it (if they want to build different kind of
* serializer). Typically, however, passed-in builder is returned, possibly with
* some modifications.
*/
public BeanSerializerBuilder updateBuilder(SerializationConfig config,
BeanDescription beanDesc, BeanSerializerBuilder builder) {
return builder;
}
/**
* Method called by {@link BeanSerializerFactory} after constructing default
* bean serializer instance with properties collected and ordered earlier.
* Implementations can modify or replace given serializer and return serializer
* to use. Note that although initial serializer being passed is of type
* {@link BeanSerializer}, modifiers may return serializers of other types;
* and this is why implementations must check for type before casting.
*<p>
* NOTE: since 2.2, gets called for serializer of those non-POJO types that
* do not go through any of more specific <code>modifyXxxSerializer</code>
* methods; mostly for JDK types like {@link java.util.Iterator} and such.
*/
public JsonSerializer<?> modifySerializer(SerializationConfig config,
BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/*
/**********************************************************
/* Callback methods for other types (since 2.2)
/**********************************************************
*/
/**
* Method called by {@link DeserializerFactory} after it has constructed the
* standard serializer for given
* {@link ArrayType}
* to make it possible to either replace or augment this serializer with
* additional functionality.
*
* @param config Configuration in use
* @param valueType Type of the value serializer is used for.
* @param beanDesc Details of the type in question, to allow checking class annotations
* @param serializer Default serializer that would be used.
*
* @return Serializer to use; either <code>serializer</code> that was passed
* in, or an instance method constructed.
*
* @since 2.2
*/
public JsonSerializer<?> modifyArraySerializer(SerializationConfig config,
ArrayType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/**
* @since 2.2
*/
public JsonSerializer<?> modifyCollectionSerializer(SerializationConfig config,
CollectionType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/**
* @since 2.2
*/
public JsonSerializer<?> modifyCollectionLikeSerializer(SerializationConfig config,
CollectionLikeType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/**
* @since 2.2
*/
public JsonSerializer<?> modifyMapSerializer(SerializationConfig config,
MapType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/**
* @since 2.2
*/
public JsonSerializer<?> modifyMapLikeSerializer(SerializationConfig config,
MapLikeType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/**
* @since 2.2
*/
public JsonSerializer<?> modifyEnumSerializer(SerializationConfig config,
JavaType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
/**
* Method called by {@link DeserializerFactory} after it has constructed the
* default key serializer to use for serializing {@link java.util.Map} keys of
* given type.
* This makes it possible to either replace or augment default serializer with
* additional functionality.
*
* @param config Configuration in use
* @param valueType Type of keys the serializer is used for.
* @param beanDesc Details of the type in question, to allow checking class annotations
* @param serializer Default serializer that would be used.
*
* @return Serializer to use; either <code>serializer</code> that was passed
* in, or an instance method constructed.
*
* @since 2.2
*/
public JsonSerializer<?> modifyKeySerializer(SerializationConfig config,
JavaType valueType, BeanDescription beanDesc, JsonSerializer<?> serializer) {
return serializer;
}
}