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General data-binding functionality for Jackson: works on core streaming API

There is a newer version: 2.18.1

package com.fasterxml.jackson.databind.deser;

import com.fasterxml.jackson.databind.*;

/**
 * Interface that defines API for simple extensions that can provide additional deserializers
 * for deserializer Map keys of various types, from JSON property names.
 * Access is by a single callback method; instance is to either return
 * a configured {@link KeyDeserializer} for specified type, or null to indicate that it
 * does not support handling of the type. In latter case, further calls can be made
 * for other providers; in former case returned key deserializer is used for handling of
 * key instances of specified type.
 */
public interface KeyDeserializers
{
    public KeyDeserializer findKeyDeserializer(JavaType type, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException;
}