org.codehaus.jackson.map.deser

## Class BeanDeserializerModifier

- java.lang.Object
- - org.codehaus.jackson.map.deser.BeanDeserializerModifier

-     public abstract class BeanDeserializerModifier
      extends Object

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

  Sequence in which callback methods are called is as follows:

- updateBuilder is called once all initial pieces for building deserializer have been collected
- `modifyDeserializer` is called after deserializer has been built by `BeanDeserializerBuilder` but before it is returned to be used

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.

Since:
  1.7

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `BeanDeserializerModifier()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `JsonDeserializer<?>` | `modifyDeserializer(DeserializationConfig config, BasicBeanDescription beanDesc, JsonDeserializer<?> deserializer)` Method called by `BeanDeserializerFactory` after constructing default bean deserializer instance with properties collected and ordered earlier.
    `BeanDeserializerBuilder` | `updateBuilder(DeserializationConfig config, BasicBeanDescription beanDesc, BeanDeserializerBuilder builder)` Method called by `BeanDeserializerFactory` when it has collected basic information such as tentative list of properties to deserialize.

    - ### 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

    - #### updateBuilder

          public BeanDeserializerBuilder updateBuilder(DeserializationConfig config,
                                              BasicBeanDescription 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,
                                               BasicBeanDescription 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.