com.fasterxml.jackson.databind.deser

Class BeanDeserializerModifier

java.lang.Object

com.fasterxml.jackson.databind.deser.BeanDeserializerModifier

public abstract class BeanDeserializerModifier
extends Object

Abstract class that defines API for objects that can be registered to participate in constructing JsonDeserializer instances (via DeserializerFactory). This is typically done by modules that want alter some aspects of deserialization process; and is preferable to sub-classing of BeanDeserializerFactory.

Note that Jackson 2.2 adds more methods for customization; with earlier versions only BeanDeserializer instances could be modified, but with 2.2 all types of deserializers can be changed.

Sequence in which callback methods are called for BeanDeserializer is:

1. updateProperties(com.fasterxml.jackson.databind.DeserializationConfig, com.fasterxml.jackson.databind.BeanDescription, java.util.List<com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition>) is called once all property definitions are collected, and initial filtering (by ignorable type and explicit ignoral-by-bean) has been performed.
2. updateBuilder(com.fasterxml.jackson.databind.DeserializationConfig, com.fasterxml.jackson.databind.BeanDescription, com.fasterxml.jackson.databind.deser.BeanDeserializerBuilder) is called once all initial pieces for building deserializer have been collected
3. modifyDeserializer(com.fasterxml.jackson.databind.DeserializationConfig, com.fasterxml.jackson.databind.BeanDescription, com.fasterxml.jackson.databind.JsonDeserializer<?>) is called after deserializer has been built by BeanDeserializerBuilder but before it is returned to be used

For other types of deserializers, methods called depend on type of values for which deserializer is being constructed; and only a single method is called since the process does not involve builders (unlike that of BeanDeserializer.

Default method implementations are "no-op"s, meaning that methods are implemented but have no effect; this is mostly so that new methods can be added in later versions.

Constructor Summary

Constructors

Constructor and Description
BeanDeserializerModifier()

Method Summary

Modifier and Type	Method and Description
JsonDeserializer<?>	modifyArrayDeserializer(DeserializationConfig config, ArrayType valueType, BeanDescription beanDesc, JsonDeserializer<?> deserializer) Method called by DeserializerFactory after it has constructed the standard deserializer for given ArrayType to make it possible to either replace or augment this deserializer with additional functionality.
JsonDeserializer<?>	modifyCollectionDeserializer(DeserializationConfig config, CollectionType type, BeanDescription beanDesc, JsonDeserializer<?> deserializer)
JsonDeserializer<?>	modifyCollectionLikeDeserializer(DeserializationConfig config, CollectionLikeType type, BeanDescription beanDesc, JsonDeserializer<?> deserializer)
JsonDeserializer<?>	modifyDeserializer(DeserializationConfig config, BeanDescription beanDesc, JsonDeserializer<?> deserializer) Method called by BeanDeserializerFactory after constructing default bean deserializer instance with properties collected and ordered earlier.
JsonDeserializer<?>	modifyEnumDeserializer(DeserializationConfig config, JavaType type, BeanDescription beanDesc, JsonDeserializer<?> deserializer)
KeyDeserializer	modifyKeyDeserializer(DeserializationConfig config, JavaType type, KeyDeserializer deserializer) Method called by DeserializerFactory after it has constructed the standard key deserializer for given key type.
JsonDeserializer<?>	modifyMapDeserializer(DeserializationConfig config, MapType type, BeanDescription beanDesc, JsonDeserializer<?> deserializer)
JsonDeserializer<?>	modifyMapLikeDeserializer(DeserializationConfig config, MapLikeType type, BeanDescription beanDesc, JsonDeserializer<?> deserializer)
BeanDeserializerBuilder	updateBuilder(DeserializationConfig config, BeanDescription beanDesc, BeanDeserializerBuilder builder) Method called by BeanDeserializerFactory when it has collected basic information such as tentative list of properties to deserialize.
List<BeanPropertyDefinition>	updateProperties(DeserializationConfig config, BeanDescription beanDesc, List<BeanPropertyDefinition> propDefs) Method called by BeanDeserializerFactory when it has collected initial list of BeanPropertyDefinitions, and done basic by-name and by-type filtering, but before constructing builder or actual property handlers; or arranging order.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BeanDeserializerModifier

public BeanDeserializerModifier()

Method Detail

updateProperties

public List<BeanPropertyDefinition> updateProperties(DeserializationConfig config,
                                                     BeanDescription beanDesc,
                                                     List<BeanPropertyDefinition> propDefs)

Method called by BeanDeserializerFactory when it has collected initial list of BeanPropertyDefinitions, and done basic by-name and by-type filtering, but before constructing builder or actual property handlers; or arranging order. The most common changes to make at this point are to completely remove specified properties, or rename then: other modifications are easier to make at later points.

updateBuilder

public BeanDeserializerBuilder updateBuilder(DeserializationConfig config,
                                             BeanDescription beanDesc,
                                             BeanDeserializerBuilder builder)

Method called by BeanDeserializerFactory when it has collected basic information such as tentative list of properties to deserialize. Implementations may choose to modify state of builder (to affect deserializer being built), or even completely replace it (if they want to build different kind of deserializer). Typically changes mostly concern set of properties to deserialize.

modifyDeserializer

public JsonDeserializer<?> modifyDeserializer(DeserializationConfig config,
                                              BeanDescription beanDesc,
                                              JsonDeserializer<?> deserializer)

Method called by BeanDeserializerFactory after constructing default bean deserializer instance with properties collected and ordered earlier. Implementations can modify or replace given deserializer and return deserializer to use. Note that although initial deserializer being passed is of type BeanDeserializer, modifiers may return deserializers of other types; and this is why implementations must check for type before casting.

modifyArrayDeserializer

public JsonDeserializer<?> modifyArrayDeserializer(DeserializationConfig config,
                                                   ArrayType valueType,
                                                   BeanDescription beanDesc,
                                                   JsonDeserializer<?> deserializer)

Method called by DeserializerFactory after it has constructed the standard deserializer for given ArrayType to make it possible to either replace or augment this deserializer with additional functionality.

Parameters:

config - Configuration in use

valueType - Type of the value deserializer is used for.

beanDesc - Description f

deserializer - Default deserializer that would be used.

Returns:

Deserializer to use; either deserializer that was passed in, or an instance method constructed.

Since:

2.2

modifyCollectionDeserializer

public JsonDeserializer<?> modifyCollectionDeserializer(DeserializationConfig config,
                                                        CollectionType type,
                                                        BeanDescription beanDesc,
                                                        JsonDeserializer<?> deserializer)

Since:

2.2

modifyCollectionLikeDeserializer

public JsonDeserializer<?> modifyCollectionLikeDeserializer(DeserializationConfig config,
                                                            CollectionLikeType type,
                                                            BeanDescription beanDesc,
                                                            JsonDeserializer<?> deserializer)

Since:

2.2

modifyMapDeserializer

public JsonDeserializer<?> modifyMapDeserializer(DeserializationConfig config,
                                                 MapType type,
                                                 BeanDescription beanDesc,
                                                 JsonDeserializer<?> deserializer)

Since:

2.2

modifyMapLikeDeserializer

public JsonDeserializer<?> modifyMapLikeDeserializer(DeserializationConfig config,
                                                     MapLikeType type,
                                                     BeanDescription beanDesc,
                                                     JsonDeserializer<?> deserializer)

Since:

2.2

modifyEnumDeserializer

public JsonDeserializer<?> modifyEnumDeserializer(DeserializationConfig config,
                                                  JavaType type,
                                                  BeanDescription beanDesc,
                                                  JsonDeserializer<?> deserializer)

Since:

2.2

modifyKeyDeserializer

public KeyDeserializer modifyKeyDeserializer(DeserializationConfig config,
                                             JavaType type,
                                             KeyDeserializer deserializer)

Method called by DeserializerFactory after it has constructed the standard key deserializer for given key type. This make it possible to replace the default key deserializer, or augment it somehow (including optional use of default deserializer with occasional override).

Since:

2.2