org.codehaus.jackson.map.deser

接口 ValueInstantiators

所有已知实现类:

SimpleValueInstantiators, ValueInstantiators.Base

public interface ValueInstantiators

Interface for providers of ValueInstantiator instances. Implemented when an object wants to provide custom value instantiators, usually to support custom value types with alternate constructors, or which need specified post-processing after construction but before binding data.

从以下版本开始:

1.9

嵌套类概要

嵌套类

限定符和类型	接口和说明
static class	ValueInstantiators.Base Basic "NOP" implementation that can be used as the base class for custom implementations.

方法概要

方法

限定符和类型	方法和说明
ValueInstantiator	findValueInstantiator(DeserializationConfig config, BeanDescription beanDesc, ValueInstantiator defaultInstantiator) Method called to find the ValueInstantiator to use for creating instances of specified type during deserialization.

方法详细资料

findValueInstantiator

ValueInstantiator findValueInstantiator(DeserializationConfig config,
                                      BeanDescription beanDesc,
                                      ValueInstantiator defaultInstantiator)

Method called to find the ValueInstantiator to use for creating instances of specified type during deserialization. Note that a default value instantiator is always created first and passed; if an implementation does not want to modify or replace it, it has to return passed instance as is (returning null is an error)

参数:

config - Deserialization configuration in use

beanDesc - Additional information about POJO type to be instantiated: description will always be of type BasicBeanDescription (that is, safe to cast to this more specific type)

defaultInstantiator - Instantiator that will be used if no changes are made; passed to allow custom instances to use annotation-provided information (note, however, that earlier ValueInstantiators may have changed it to a custom instantiator already)

返回:

Instantiator to use; either defaultInstantiator that was passed, or a custom variant; can not be null.