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package com.fasterxml.jackson.databind.deser;

import com.fasterxml.jackson.databind.*;

/**
 * Add-on interface that {@link JsonDeserializer}s can implement to get a callback
 * that can be used to create contextual (context-dependent) instances of
 * deserializer to use for  handling properties of supported type.
 * This can be useful
 * for deserializers that can be configured by annotations, or should otherwise
 * have differing behavior depending on what kind of property is being deserialized.
 *

* Note that in cases where deserializer needs both contextualization and * resolution -- that is, implements both this interface and {@link ResolvableDeserializer} * -- resolution via {@link ResolvableDeserializer} occurs first, and contextual * resolution (via this interface) later on. */ public interface ContextualDeserializer { /** * Method called to see if a different (or differently configured) deserializer * is needed to deserialize values of specified property. * Note that instance that this method is called on is typically shared one and * as a result method should NOT modify this instance but rather construct * and return a new instance. This instance should only be returned as-is, in case * it is already suitable for use. * * @param ctxt Deserialization context to access configuration, additional * deserializers that may be needed by this deserializer * @param property Method, field or constructor parameter that represents the property * (and is used to assign deserialized value). * Should be available; but there may be cases where caller cannot provide it and * null is passed instead (in which case impls usually pass 'this' deserializer as is) * * @return Deserializer to use for deserializing values of specified property; * may be this instance or a new instance. * * @throws JsonMappingException */ public JsonDeserializer createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException; }





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