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package com.facebook.presto.jdbc.internal.jackson.databind.deser;

import com.facebook.presto.jdbc.internal.jackson.databind.DeserializationContext;
import com.facebook.presto.jdbc.internal.jackson.databind.JsonMappingException;

/**
 * Interface used to indicate deserializers that want to do post-processing
 * after construction but before being returned to caller (and possibly cached)
 * and used.
 * This is typically used to resolve references
 * to other contained types; for example, bean deserializers use this callback
 * to locate deserializers for contained field types.
 * Main reason for using a callback (instead of trying to resolve dependencies
 * immediately) is to make it possible to cleanly handle self-references;
 * otherwise it would be easy to get into infinite recursion.
 *

* Note that {@link #resolve} method does NOT allow returning anything * (specifically, a new deserializer instance): reason for this is that * allowing this would not work with proper handling of cyclic dependencies, * which are resolved by two-phase processing, where initially constructed * deserializer is added as known deserializer, and only after this * resolution is done. Resolution is the part that results in lookups for * dependant deserializers, which may include handling references to * deserializer itself. *

* Note that in cases where deserializer needs both contextualization and * resolution -- that is, implements both this interface and {@link ContextualDeserializer} * -- resolution via this interface occurs first, and contextual * resolution (using {@link ContextualDeserializer}) later on. */ public interface ResolvableDeserializer { /** * Method called after deserializer instance has been constructed * (and registered as necessary by provider objects), * but before it has returned it to the caller. * Called object can then resolve its dependencies to other types, * including self-references (direct or indirect). * * @param ctxt Context to use for accessing configuration, resolving * secondary deserializers */ public abstract void resolve(DeserializationContext ctxt) throws JsonMappingException; }





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