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package com.fasterxml.jackson.databind.deser;

import java.util.List;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.BeanDeserializer;
import com.fasterxml.jackson.databind.deser.BeanDeserializerFactory;
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition;

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

* Sequence in which callback methods are called is as follows: *

  • {@link #updateProperties} is called once all property definitions are * collected, and initial filtering (by ignorable type and explicit ignoral-by-bean) * has been performed. *
  • {@link #updateBuilder} is called once all initial pieces for building deserializer * have been collected *
  • *
  • {@link #modifyDeserializer} is called after deserializer has been built * by {@link 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. */ public abstract class BeanDeserializerModifier { /** * Method called by {@link BeanDeserializerFactory} when it has collected * initial list of {@link BeanPropertyDefinition}s, 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. */ public List updateProperties(DeserializationConfig config, BeanDescription beanDesc, List propDefs) { return propDefs; } /** * Method called by {@link 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. */ public BeanDeserializerBuilder updateBuilder(DeserializationConfig config, BeanDescription beanDesc, BeanDeserializerBuilder builder) { return builder; } /** * Method called by {@link 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 * {@link BeanDeserializer}, modifiers may return deserializers of other types; * and this is why implementations must check for type before casting. */ public JsonDeserializer modifyDeserializer(DeserializationConfig config, BeanDescription beanDesc, JsonDeserializer deserializer) { return deserializer; } }





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