com.fasterxml.jackson.databind.deser.DeserializerFactory Maven / Gradle / Ivy

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package com.fasterxml.jackson.databind.deser;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.*;

/**
 * Abstract class that defines API used by {@link DeserializationContext}
 * to construct actual
 * {@link JsonDeserializer} instances (which are then cached by
 * context and/or dedicated cache).
 *
 * Since there are multiple broad categories of deserializers, there are 
 * multiple factory methods:
 *

 * For JSON "Array" type, we need 2 methods: one to deal with expected
 *   Java arrays ({@link #createArrayDeserializer})
 *   and the other for other Java containers like {@link java.util.List}s
 *   and {@link java.util.Set}s ({@link #createCollectionDeserializer}).
 *   Actually there is also a third method for "Collection-like" types;
 *   things like Scala collections that act like JDK collections but do not
 *   implement same interfaces.
 *  
 * For JSON "Object" type, we need 2 methods: one to deal with
 *   expected Java {@link java.util.Map}s
 *   ({@link #createMapDeserializer}), and another for POJOs
 *   ({@link #createBeanDeserializer}.
 *   As an additional twist there is also a callback for "Map-like" types,
 *   mostly to make it possible to support Scala Maps (which are NOT JDK
 *   Map compatible).
 *  
 * For Tree Model ({@link com.fasterxml.jackson.databind.JsonNode}) properties there is
 *    {@link #createTreeDeserializer}
 * 
For enumerated types ({@link java.lang.Enum}) there is
 *    {@link #createEnumDeserializer}
 *  
 * For all other types, {@link #createBeanDeserializer} is used.
 * 
 *
 */
public abstract class DeserializerFactory
{
    protected final static Deserializers[] NO_DESERIALIZERS = new Deserializers[0];

    /*
    /********************************************************
    /* Configuration handling
    /********************************************************
     */

    /**
     * Convenience method for creating a new factory instance with additional deserializer
     * provider.
     */
    public abstract DeserializerFactory withAdditionalDeserializers(Deserializers additional);

    /**
     * Convenience method for creating a new factory instance with additional
     * {@link KeyDeserializers}.
     */
    public abstract DeserializerFactory withAdditionalKeyDeserializers(KeyDeserializers additional);
    
    /**
     * Convenience method for creating a new factory instance with additional
     * {@link BeanDeserializerModifier}.
     */
    public abstract DeserializerFactory withDeserializerModifier(BeanDeserializerModifier modifier);

    /**
     * Convenience method for creating a new factory instance with additional
     * {@link AbstractTypeResolver}.
     */
    public abstract DeserializerFactory withAbstractTypeResolver(AbstractTypeResolver resolver);

    /**
     * Convenience method for creating a new factory instance with additional
     * {@link ValueInstantiators}.
     */
    public abstract DeserializerFactory withValueInstantiators(ValueInstantiators instantiators);
    
    /*
    /**********************************************************
    /* Basic DeserializerFactory API:
    /**********************************************************
     */

    /**
     * Method that can be called to try to resolve an abstract type
     * (interface, abstract class) into a concrete type, or at least
     * something "more concrete" (abstract class instead of interface).
     * Will either return passed type, or a more specific type.
     */
    public abstract JavaType mapAbstractType(DeserializationConfig config, JavaType type)
        throws JsonMappingException;

    /**
     * Method that is to find all creators (constructors, factory methods)
     * for the bean type to deserialize.
     */
    public abstract ValueInstantiator findValueInstantiator(DeserializationContext ctxt,
            BeanDescription beanDesc)
        throws JsonMappingException;
    
    /**
     * Method called to create (or, for completely immutable deserializers,
     * reuse) a deserializer that can convert JSON content into values of
     * specified Java "bean" (POJO) type.
     * At this point it is known that the type is not otherwise recognized
     * as one of structured types (array, Collection, Map) or a well-known
     * JDK type (enum, primitives/wrappers, String); this method only
     * gets called if other options are exhausted. This also means that
     * this method can be overridden to add support for custom types.
     *
     * @param type Type to be deserialized
     */
    public abstract JsonDeserializer