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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.*;

/**
 * Interface that defines API for simple extensions that can provide additional deserializers
 * for various types. Access is by a single callback method; instance is to either return
 * a configured {@link JsonDeserializer} 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 deserializer is used for handling of
 * instances of specified type.
 *

* It is strongly recommended that implementations always extend {@link Deserializers.Base} * and NOT just implement {@link Deserializers}. */ public interface Deserializers { // // // Scalar types first: /** * Method called to locate deserializer for specified {@link java.lang.Enum} type. * * @param type Type of {@link java.lang.Enum} instances to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findEnumDeserializer(Class type, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException; /** * Method called to locate deserializer for specified JSON tree node type. * * @param nodeType Specific type of JSON tree nodes to deserialize * (subtype of {@link com.fasterxml.jackson.databind.JsonNode}) * @param config Configuration in effect * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findTreeNodeDeserializer(Class nodeType, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException; /** * Method called to locate deserializer for specified value type which does not belong to any other * category (not an Enum, Collection, Map, Array, reference value or tree node) * * @param type Bean type to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findBeanDeserializer(JavaType type, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException; // // // Then container types /** * Method called to locate deserializer for value that is of referential * type, * * @param refType Specific referential type to deserialize * @param config Configuration in effect * @param beanDesc Definition of the reference type that contains class annotations and * other information typically needed for building deserializers * @param contentTypeDeserializer Possible type deserializer for referenced value * @param contentDeserializer Value deserializer to use for referenced value, if indicated * by property annotation * * @return Deserializer to use for the type; or null if this provider does not know how to construct it * * @since 2.7 */ public JsonDeserializer findReferenceDeserializer(ReferenceType refType, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer contentTypeDeserializer, JsonDeserializer contentDeserializer) throws JsonMappingException; /** * Method called to locate serializer for specified array type. *

* Deserializer for element type may be passed, if configured explicitly at higher level (by * annotations, typically), but usually are not. * Type deserializer for element is passed if one is needed based on contextual information * (annotations on declared element class; or on field or method type is associated with). * * @param type Type of array instances to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * @param elementTypeDeserializer If element type needs polymorphic type handling, this is * the type information deserializer to use; should usually be used as is when constructing * array deserializer. * @param elementDeserializer Deserializer to use for elements, if explicitly defined (by using * annotations, for exmple). May be null, in which case it should be resolved here (or using * {@link ResolvableDeserializer} callback) * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findArrayDeserializer(ArrayType type, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException; /** * Method called to locate serializer for specified {@link java.util.Collection} (List, Set etc) type. *

* Deserializer for element type may be passed, if configured explicitly at higher level (by * annotations, typically), but usually are not. * Type deserializer for element is passed if one is needed based on contextual information * (annotations on declared element class; or on field or method type is associated with). * * @param type Type of collection instances to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * @param elementTypeDeserializer If element type needs polymorphic type handling, this is * the type information deserializer to use; should usually be used as is when constructing * array deserializer. * @param elementDeserializer Deserializer to use for elements, if explicitly defined (by using * annotations, for exmple). May be null, in which case it should be resolved here (or using * {@link ResolvableDeserializer} callback) * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findCollectionDeserializer(CollectionType type, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException; /** * Method called to locate serializer for specified * "Collection-like" type (one that acts * like {@link java.util.Collection} but does not implement it). *

* Deserializer for element type may be passed, if configured explicitly at higher level (by * annotations, typically), but usually are not. * Type deserializer for element is passed if one is needed based on contextual information * (annotations on declared element class; or on field or method type is associated with). * * @param type Type of instances to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * @param elementTypeDeserializer If element type needs polymorphic type handling, this is * the type information deserializer to use; should usually be used as is when constructing * array deserializer. * @param elementDeserializer Deserializer to use for elements, if explicitly defined (by using * annotations, for exmple). May be null, in which case it should be resolved here (or using * {@link ResolvableDeserializer} callback) * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findCollectionLikeDeserializer(CollectionLikeType type, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException; /** * Method called to locate deserializer for specified {@link java.util.Map} type. *

* Deserializer for element type may be passed, if configured explicitly at higher level (by * annotations, typically), but usually are not. * Type deserializer for element is passed if one is needed based on contextual information * (annotations on declared element class; or on field or method type is associated with). *

* Similarly, a {@link KeyDeserializer} may be passed, but this is only done if there is * a specific configuration override (annotations) to indicate instance to use. * Otherwise null is passed, and key deserializer needs to be obtained later during * resolution (using {@link ResolvableDeserializer#resolve}). * * @param type Type of {@link java.util.Map} instances to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * @param keyDeserializer Key deserializer use, if it is defined via annotations or other configuration; * null if default key deserializer for key type can be used. * @param elementTypeDeserializer If element type needs polymorphic type handling, this is * the type information deserializer to use; should usually be used as is when constructing * array deserializer. * @param elementDeserializer Deserializer to use for elements, if explicitly defined (by using * annotations, for exmple). May be null, in which case it should be resolved here (or using * {@link ResolvableDeserializer} callback) * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findMapDeserializer(MapType type, DeserializationConfig config, BeanDescription beanDesc, KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException; /** * Method called to locate serializer for specified * "Map-like" type (one that acts * like {@link java.util.Map} but does not implement it). *

* Deserializer for element type may be passed, if configured explicitly at higher level (by * annotations, typically), but usually are not. * Type deserializer for element is passed if one is needed based on contextual information * (annotations on declared element class; or on field or method type is associated with). *

* Similarly, a {@link KeyDeserializer} may be passed, but this is only done if there is * a specific configuration override (annotations) to indicate instance to use. * Otherwise null is passed, and key deserializer needs to be obtained later during * resolution (using {@link ResolvableDeserializer#resolve}). * * @param type Type of {@link java.util.Map} instances to deserialize * @param config Configuration in effect * @param beanDesc Definition of the enumeration type that contains class annotations and * other information typically needed for building deserializers * @param keyDeserializer Key deserializer use, if it is defined via annotations or other configuration; * null if default key deserializer for key type can be used. * @param elementTypeDeserializer If element type needs polymorphic type handling, this is * the type information deserializer to use; should usually be used as is when constructing * array deserializer. * @param elementDeserializer Deserializer to use for elements, if explicitly defined (by using * annotations, for exmple). May be null, in which case it should be resolved here (or using * {@link ResolvableDeserializer} callback) * * @return Deserializer to use for the type; or null if this provider does not know how to construct it */ public JsonDeserializer findMapLikeDeserializer(MapLikeType type, DeserializationConfig config, BeanDescription beanDesc, KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException; /** * Method that may be called to check whether this deserializer provider would provide * deserializer for values of given type, without attempting to construct (and possibly * fail in some cases) actual deserializer. Mostly needed to support validation * of polymorphic type ids. *

* Note: implementations should take care NOT to claim supporting types that they do * not recognize as this could to incorrect assumption of safe support by caller. *

* Method added in Jackson 2.13 now that Java 8 default implementations are available * for use with interface definitions. * * @since 2.13 */ public default boolean hasDeserializerFor(DeserializationConfig config, Class valueType) { return false; } /* /********************************************************************** /* Helper classes /********************************************************************** */ /** * Basic {@link Deserializers} implementation that implements all methods but provides * no deserializers. Its main purpose is to serve as a base class so that * sub-classes only need to override methods they need, as most of the time some * of methods are not needed (especially enumeration and array deserializers are * very rarely overridden). */ public abstract static class Base implements Deserializers { @Override public JsonDeserializer findEnumDeserializer(Class type, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException { return null; } @Override public JsonDeserializer findTreeNodeDeserializer(Class nodeType, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException { return null; } @Override public JsonDeserializer findReferenceDeserializer(ReferenceType refType, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer contentTypeDeserializer, JsonDeserializer contentDeserializer) throws JsonMappingException { return null; } @Override public JsonDeserializer findBeanDeserializer(JavaType type, DeserializationConfig config, BeanDescription beanDesc) throws JsonMappingException { return null; } @Override public JsonDeserializer findArrayDeserializer(ArrayType type, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException { return null; } @Override public JsonDeserializer findCollectionDeserializer(CollectionType type, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException { return null; } @Override public JsonDeserializer findCollectionLikeDeserializer(CollectionLikeType type, DeserializationConfig config, BeanDescription beanDesc, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException { return null; } @Override public JsonDeserializer findMapDeserializer(MapType type, DeserializationConfig config, BeanDescription beanDesc, KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException { return null; } @Override public JsonDeserializer findMapLikeDeserializer(MapLikeType type, DeserializationConfig config, BeanDescription beanDesc, KeyDeserializer keyDeserializer, TypeDeserializer elementTypeDeserializer, JsonDeserializer elementDeserializer) throws JsonMappingException { return null; } } }





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