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org.codehaus.jackson.map.deser.BasicDeserializerFactory Maven / Gradle / Ivy
Data Mapper package is a high-performance data binding package
built on Jackson JSON processor
package org.codehaus.jackson.map.deser;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.*;
import org.codehaus.jackson.map.deser.std.AtomicReferenceDeserializer;
import org.codehaus.jackson.map.deser.std.CollectionDeserializer;
import org.codehaus.jackson.map.deser.std.EnumDeserializer;
import org.codehaus.jackson.map.deser.std.EnumMapDeserializer;
import org.codehaus.jackson.map.deser.std.EnumSetDeserializer;
import org.codehaus.jackson.map.deser.std.JsonNodeDeserializer;
import org.codehaus.jackson.map.deser.std.MapDeserializer;
import org.codehaus.jackson.map.deser.std.ObjectArrayDeserializer;
import org.codehaus.jackson.map.deser.std.PrimitiveArrayDeserializers;
import org.codehaus.jackson.map.deser.std.StdKeyDeserializers;
import org.codehaus.jackson.map.deser.std.StringCollectionDeserializer;
import org.codehaus.jackson.map.ext.OptionalHandlerFactory;
import org.codehaus.jackson.map.introspect.*;
import org.codehaus.jackson.map.jsontype.NamedType;
import org.codehaus.jackson.map.jsontype.TypeResolverBuilder;
import org.codehaus.jackson.map.type.*;
import org.codehaus.jackson.map.util.EnumResolver;
import org.codehaus.jackson.type.JavaType;
/**
* Abstract factory base class that can provide deserializers for standard
* JDK classes, including collection classes and simple heuristics for
* "upcasting" commmon collection interface types
* (such as {@link java.util.Collection}).
*
* Since all simple deserializers are eagerly instantiated, and there is
* no additional introspection or customizability of these types,
* this factory is stateless.
*/
public abstract class BasicDeserializerFactory
extends DeserializerFactory
{
/**
* We will pre-create serializers for common non-structured
* (that is things other than Collection, Map or array)
* types. These need not go through factory.
*/
final static HashMap> _simpleDeserializers = StdDeserializers.constructAll();
/**
* Set of available key deserializers is currently limited
* to standard types; and all known instances are storing
* in this map.
*/
final static HashMap _keyDeserializers = StdKeyDeserializers.constructAll();
/* We do some defaulting for abstract Map classes and
* interfaces, to avoid having to use exact types or annotations in
* cases where the most common concrete Maps will do.
*/
@SuppressWarnings("rawtypes")
final static HashMap> _mapFallbacks =
new HashMap>();
static {
_mapFallbacks.put(Map.class.getName(), LinkedHashMap.class);
_mapFallbacks.put(ConcurrentMap.class.getName(), ConcurrentHashMap.class);
_mapFallbacks.put(SortedMap.class.getName(), TreeMap.class);
/* 11-Jan-2009, tatu: Let's see if we can still add support for
* JDK 1.6 interfaces, even if we run on 1.5. Just need to be
* more careful with typos, since compiler won't notice any
* problems...
*/
_mapFallbacks.put("java.util.NavigableMap", TreeMap.class);
try {
Class key = Class.forName("java.util.concurrent.ConcurrentNavigableMap");
Class value = Class.forName("java.util.concurrent.ConcurrentSkipListMap");
@SuppressWarnings("unchecked")
Class> mapValue = (Class>) value;
_mapFallbacks.put(key.getName(), mapValue);
} catch (ClassNotFoundException cnfe) { // occurs on 1.5
} catch (SecurityException se) {
}
}
/* We do some defaulting for abstract Collection classes and
* interfaces, to avoid having to use exact types or annotations in
* cases where the most common concrete Collection will do.
*/
@SuppressWarnings("rawtypes")
final static HashMap> _collectionFallbacks =
new HashMap>();
static {
_collectionFallbacks.put(Collection.class.getName(), ArrayList.class);
_collectionFallbacks.put(List.class.getName(), ArrayList.class);
_collectionFallbacks.put(Set.class.getName(), HashSet.class);
_collectionFallbacks.put(SortedSet.class.getName(), TreeSet.class);
_collectionFallbacks.put(Queue.class.getName(), LinkedList.class);
/* 11-Jan-2009, tatu: Let's see if we can still add support for
* JDK 1.6 interfaces, even if we run on 1.5. Just need to be
* more careful with typos, since compiler won't notice any
* problems...
*/
_collectionFallbacks.put("java.util.Deque", LinkedList.class);
_collectionFallbacks.put("java.util.NavigableSet", TreeSet.class);
}
/**
* And finally, we have special array deserializers for primitive
* array types
*/
protected final static HashMap> _arrayDeserializers
= PrimitiveArrayDeserializers.getAll();
/**
* To support external/optional deserializers, we'll use this helper class
* (as per [JACKSON-386])
*/
protected OptionalHandlerFactory optionalHandlers = OptionalHandlerFactory.instance;
/*
/**********************************************************
/* Life cycle
/**********************************************************
*/
protected BasicDeserializerFactory() { }
// can't be implemented quite here
@Override
public abstract DeserializerFactory withConfig(DeserializerFactory.Config config);
/*
/**********************************************************
/* Methods for sub-classes to override to provide
/* custom deserializers (since 1.7)
/**********************************************************
*/
protected abstract JsonDeserializer _findCustomArrayDeserializer(ArrayType type, DeserializationConfig config,
DeserializerProvider p, BeanProperty property,
TypeDeserializer elementTypeDeser, JsonDeserializer elementDeser)
throws JsonMappingException;
protected abstract JsonDeserializer _findCustomCollectionDeserializer(
CollectionType type, DeserializationConfig config,
DeserializerProvider p, BasicBeanDescription beanDesc, BeanProperty property,
TypeDeserializer elementTypeDeser, JsonDeserializer elementDeser)
throws JsonMappingException;
protected abstract JsonDeserializer _findCustomCollectionLikeDeserializer(
CollectionLikeType type, DeserializationConfig config,
DeserializerProvider p, BasicBeanDescription beanDesc, BeanProperty property,
TypeDeserializer elementTypeDeser, JsonDeserializer elementDeser)
throws JsonMappingException;
protected abstract JsonDeserializer _findCustomEnumDeserializer(Class type,
DeserializationConfig config, BasicBeanDescription beanDesc, BeanProperty property)
throws JsonMappingException;
protected abstract JsonDeserializer _findCustomMapDeserializer(MapType type,
DeserializationConfig config,
DeserializerProvider p, BasicBeanDescription beanDesc, BeanProperty property,
KeyDeserializer keyDeser,
TypeDeserializer elementTypeDeser, JsonDeserializer elementDeser)
throws JsonMappingException;
protected abstract JsonDeserializer _findCustomMapLikeDeserializer(MapLikeType type,
DeserializationConfig config,
DeserializerProvider p, BasicBeanDescription beanDesc, BeanProperty property,
KeyDeserializer keyDeser,
TypeDeserializer elementTypeDeser, JsonDeserializer elementDeser)
throws JsonMappingException;
protected abstract JsonDeserializer _findCustomTreeNodeDeserializer(Class type,
DeserializationConfig config, BeanProperty property)
throws JsonMappingException;
/*
/**********************************************************
/* JsonDeserializerFactory impl (partial)
/**********************************************************
*/
@Override
public abstract ValueInstantiator findValueInstantiator(DeserializationConfig config,
BasicBeanDescription beanDesc)
throws JsonMappingException;
@Override
public abstract JavaType mapAbstractType(DeserializationConfig config, JavaType type)
throws JsonMappingException;
@Override
public JsonDeserializer createArrayDeserializer(DeserializationConfig config, DeserializerProvider p,
ArrayType type, BeanProperty property)
throws JsonMappingException
{
JavaType elemType = type.getContentType();
// Very first thing: is deserializer hard-coded for elements?
JsonDeserializer contentDeser = elemType.getValueHandler();
if (contentDeser == null) {
// Maybe special array type, such as "primitive" arrays (int[] etc)
JsonDeserializer deser = _arrayDeserializers.get(elemType);
if (deser != null) {
/* 23-Nov-2010, tatu: Although not commonly needed, ability to override
* deserializers for all types (including primitive arrays) is useful
* so let's allow this
*/
JsonDeserializer custom = _findCustomArrayDeserializer(type, config, p, property, null, null);
if (custom != null) {
return custom;
}
return deser;
}
// If not, generic one:
if (elemType.isPrimitive()) { // sanity check
throw new IllegalArgumentException("Internal error: primitive type ("+type+") passed, no array deserializer found");
}
}
// Then optional type info (1.5): if type has been resolved, we may already know type deserializer:
TypeDeserializer elemTypeDeser = elemType.getTypeHandler();
// but if not, may still be possible to find:
if (elemTypeDeser == null) {
elemTypeDeser = findTypeDeserializer(config, elemType, property);
}
// 23-Nov-2010, tatu: Custom array deserializer?
JsonDeserializer custom = _findCustomArrayDeserializer(type, config, p, property, elemTypeDeser, contentDeser);
if (custom != null) {
return custom;
}
if (contentDeser == null) {
// 'null' -> arrays have no referring fields
contentDeser = p.findValueDeserializer(config, elemType, property);
}
return new ObjectArrayDeserializer(type, contentDeser, elemTypeDeser);
}
@Override
public JsonDeserializer createCollectionDeserializer(DeserializationConfig config, DeserializerProvider p,
CollectionType type, BeanProperty property)
throws JsonMappingException
{
// First: global defaulting:
type = (CollectionType) mapAbstractType(config, type);
Class collectionClass = type.getRawClass();
BasicBeanDescription beanDesc = config.introspectForCreation(type);
// Explicit deserializer to use? (@JsonDeserialize.using)
JsonDeserializer deser = findDeserializerFromAnnotation(config, beanDesc.getClassInfo(), property);
if (deser != null) {
return deser;
}
// If not, any type modifiers? (@JsonDeserialize.as)
type = modifyTypeByAnnotation(config, beanDesc.getClassInfo(), type, null);
JavaType contentType = type.getContentType();
// Very first thing: is deserializer hard-coded for elements?
JsonDeserializer contentDeser = contentType.getValueHandler();
// Then optional type info (1.5): if type has been resolved, we may already know type deserializer:
TypeDeserializer contentTypeDeser = contentType.getTypeHandler();
// but if not, may still be possible to find:
if (contentTypeDeser == null) {
contentTypeDeser = findTypeDeserializer(config, contentType, property);
}
// 23-Nov-2010, tatu: Custom deserializer?
JsonDeserializer custom = _findCustomCollectionDeserializer(type, config, p, beanDesc, property,
contentTypeDeser, contentDeser);
if (custom != null) {
return custom;
}
if (contentDeser == null) { // not defined by annotation
// One special type: EnumSet:
if (EnumSet.class.isAssignableFrom(collectionClass)) {
return new EnumSetDeserializer(contentType.getRawClass(),
createEnumDeserializer(config, p, contentType, property));
}
// But otherwise we can just use a generic value deserializer:
// 'null' -> collections have no referring fields
contentDeser = p.findValueDeserializer(config, contentType, property);
}
/* One twist: if we are being asked to instantiate an interface or
* abstract Collection, we need to either find something that implements
* the thing, or give up.
*
* Note that we do NOT try to guess based on secondary interfaces
* here; that would probably not work correctly since casts would
* fail later on (as the primary type is not the interface we'd
* be implementing)
*/
if (type.isInterface() || type.isAbstract()) {
@SuppressWarnings({ "rawtypes" })
Class fallback = _collectionFallbacks.get(collectionClass.getName());
if (fallback == null) {
throw new IllegalArgumentException("Can not find a deserializer for non-concrete Collection type "+type);
}
collectionClass = fallback;
type = (CollectionType) config.constructSpecializedType(type, collectionClass);
// But if so, also need to re-check creators...
beanDesc = config.introspectForCreation(type);
}
ValueInstantiator inst = findValueInstantiator(config, beanDesc);
// 13-Dec-2010, tatu: Can use more optimal deserializer if content type is String, so:
if (contentType.getRawClass() == String.class) {
// no value type deserializer because Strings are one of natural/native types:
return new StringCollectionDeserializer(type, contentDeser, inst);
}
return new CollectionDeserializer(type, contentDeser, contentTypeDeser, inst);
}
// Copied almost verbatim from "createCollectionDeserializer" -- should try to share more code
@Override
public JsonDeserializer createCollectionLikeDeserializer(DeserializationConfig config,
DeserializerProvider p, CollectionLikeType type, BeanProperty property)
throws JsonMappingException
{
// First: global defaulting:
type = (CollectionLikeType) mapAbstractType(config, type);
Class collectionClass = type.getRawClass();
BasicBeanDescription beanDesc = config.introspectClassAnnotations(collectionClass);
// Explicit deserializer to use? (@JsonDeserialize.using)
JsonDeserializer deser = findDeserializerFromAnnotation(config, beanDesc.getClassInfo(), property);
if (deser != null) {
return deser;
}
// If not, any type modifiers? (@JsonDeserialize.as)
type = modifyTypeByAnnotation(config, beanDesc.getClassInfo(), type, null);
JavaType contentType = type.getContentType();
// Very first thing: is deserializer hard-coded for elements?
JsonDeserializer contentDeser = contentType.getValueHandler();
// Then optional type info (1.5): if type has been resolved, we may already know type deserializer:
TypeDeserializer contentTypeDeser = contentType.getTypeHandler();
// but if not, may still be possible to find:
if (contentTypeDeser == null) {
contentTypeDeser = findTypeDeserializer(config, contentType, property);
}
return _findCustomCollectionLikeDeserializer(type, config, p, beanDesc, property,
contentTypeDeser, contentDeser);
}
@Override
public JsonDeserializer createMapDeserializer(DeserializationConfig config, DeserializerProvider p,
MapType type, BeanProperty property)
throws JsonMappingException
{
// First: global defaulting:
type = (MapType) mapAbstractType(config, type);
BasicBeanDescription beanDesc = config.introspectForCreation(type);
// Explicit deserializer to use? (@JsonDeserialize.using)
JsonDeserializer deser = findDeserializerFromAnnotation(config, beanDesc.getClassInfo(), property);
if (deser != null) {
return deser;
}
// If not, any type modifiers? (@JsonDeserialize.as)
type = modifyTypeByAnnotation(config, beanDesc.getClassInfo(), type, null);
JavaType keyType = type.getKeyType();
JavaType contentType = type.getContentType();
// First: is there annotation-specified deserializer for values?
@SuppressWarnings("unchecked")
JsonDeserializer contentDeser = (JsonDeserializer) contentType.getValueHandler();
// Ok: need a key deserializer (null indicates 'default' here)
KeyDeserializer keyDes = (KeyDeserializer) keyType.getValueHandler();
if (keyDes == null) {
keyDes = p.findKeyDeserializer(config, keyType, property);
}
// Then optional type info (1.5); either attached to type, or resolve separately:
TypeDeserializer contentTypeDeser = contentType.getTypeHandler();
// but if not, may still be possible to find:
if (contentTypeDeser == null) {
contentTypeDeser = findTypeDeserializer(config, contentType, property);
}
// 23-Nov-2010, tatu: Custom deserializer?
JsonDeserializer custom = _findCustomMapDeserializer(type, config, p, beanDesc, property,
keyDes, contentTypeDeser, contentDeser);
if (custom != null) {
return custom;
}
if (contentDeser == null) { // nope...
// 'null' -> maps have no referring fields
contentDeser = p.findValueDeserializer(config, contentType, property);
}
/* Value handling is identical for all,
* but EnumMap requires special handling for keys
*/
Class mapClass = type.getRawClass();
if (EnumMap.class.isAssignableFrom(mapClass)) {
Class kt = keyType.getRawClass();
if (kt == null || !kt.isEnum()) {
throw new IllegalArgumentException("Can not construct EnumMap; generic (key) type not available");
}
return new EnumMapDeserializer(keyType.getRawClass(),
createEnumDeserializer(config, p, keyType, property),
contentDeser);
}
// Otherwise, generic handler works ok.
/* But there is one more twist: if we are being asked to instantiate
* an interface or abstract Map, we need to either find something
* that implements the thing, or give up.
*
* Note that we do NOT try to guess based on secondary interfaces
* here; that would probably not work correctly since casts would
* fail later on (as the primary type is not the interface we'd
* be implementing)
*/
if (type.isInterface() || type.isAbstract()) {
@SuppressWarnings("rawtypes")
Class fallback = _mapFallbacks.get(mapClass.getName());
if (fallback == null) {
throw new IllegalArgumentException("Can not find a deserializer for non-concrete Map type "+type);
}
mapClass = fallback;
type = (MapType) config.constructSpecializedType(type, mapClass);
// But if so, also need to re-check creators...
beanDesc = config.introspectForCreation(type);
}
ValueInstantiator inst = findValueInstantiator(config, beanDesc);
MapDeserializer md = new MapDeserializer(type, inst, keyDes, contentDeser, contentTypeDeser);
md.setIgnorableProperties(config.getAnnotationIntrospector().findPropertiesToIgnore(beanDesc.getClassInfo()));
return md;
}
// Copied almost verbatim from "createMapDeserializer" -- should try to share more code
@Override
public JsonDeserializer createMapLikeDeserializer(DeserializationConfig config,
DeserializerProvider p, MapLikeType type, BeanProperty property)
throws JsonMappingException
{
// First: global defaulting:
type = (MapLikeType) mapAbstractType(config, type);
BasicBeanDescription beanDesc = config.introspectForCreation(type);
// Explicit deserializer to use? (@JsonDeserialize.using)
JsonDeserializer deser = findDeserializerFromAnnotation(config, beanDesc.getClassInfo(), property);
if (deser != null) {
return deser;
}
// If not, any type modifiers? (@JsonDeserialize.as)
type = modifyTypeByAnnotation(config, beanDesc.getClassInfo(), type, null);
JavaType keyType = type.getKeyType();
JavaType contentType = type.getContentType();
// First: is there annotation-specified deserializer for values?
@SuppressWarnings("unchecked")
JsonDeserializer contentDeser = (JsonDeserializer) contentType.getValueHandler();
// Ok: need a key deserializer (null indicates 'default' here)
KeyDeserializer keyDes = (KeyDeserializer) keyType.getValueHandler();
if (keyDes == null) {
keyDes = p.findKeyDeserializer(config, keyType, property);
}
// Then optional type info (1.5); either attached to type, or resolve separately:
TypeDeserializer contentTypeDeser = contentType.getTypeHandler();
// but if not, may still be possible to find:
if (contentTypeDeser == null) {
contentTypeDeser = findTypeDeserializer(config, contentType, property);
}
return _findCustomMapLikeDeserializer(type, config, p, beanDesc, property,
keyDes, contentTypeDeser, contentDeser);
}
/**
* Factory method for constructing serializers of {@link Enum} types.
*/
@Override
public JsonDeserializer createEnumDeserializer(DeserializationConfig config, DeserializerProvider p,
JavaType type, BeanProperty property)
throws JsonMappingException
{
/* 18-Feb-2009, tatu: Must first check if we have a class annotation
* that should override default deserializer
*/
BasicBeanDescription beanDesc = config.introspectForCreation(type);
JsonDeserializer des = findDeserializerFromAnnotation(config, beanDesc.getClassInfo(), property);
if (des != null) {
return des;
}
Class enumClass = type.getRawClass();
// 23-Nov-2010, tatu: Custom deserializer?
JsonDeserializer custom = _findCustomEnumDeserializer(enumClass, config, beanDesc, property);
if (custom != null) {
return custom;
}
// [JACKSON-193] May have @JsonCreator for static factory method:
for (AnnotatedMethod factory : beanDesc.getFactoryMethods()) {
if (config.getAnnotationIntrospector().hasCreatorAnnotation(factory)) {
int argCount = factory.getParameterCount();
if (argCount == 1) {
Class returnType = factory.getRawType();
// usually should be class, but may be just plain Enum (for Enum.valueOf()?)
if (returnType.isAssignableFrom(enumClass)) {
return EnumDeserializer.deserializerForCreator(config, enumClass, factory);
}
}
throw new IllegalArgumentException("Unsuitable method ("+factory+") decorated with @JsonCreator (for Enum type "
+enumClass.getName()+")");
}
}
return new EnumDeserializer(constructEnumResolver(enumClass, config));
}
@Override
public JsonDeserializer createTreeDeserializer(DeserializationConfig config, DeserializerProvider p,
JavaType nodeType, BeanProperty property)
throws JsonMappingException
{
@SuppressWarnings("unchecked")
Class nodeClass = (Class) nodeType.getRawClass();
// 23-Nov-2010, tatu: Custom deserializer?
JsonDeserializer custom = _findCustomTreeNodeDeserializer(nodeClass, config, property);
if (custom != null) {
return custom;
}
return JsonNodeDeserializer.getDeserializer(nodeClass);
}
/**
* Method called by {@link BeanDeserializerFactory} to see if there might be a standard
* deserializer registered for given type.
*
* @since 1.8
*/
@SuppressWarnings("unchecked")
protected JsonDeserializer findStdBeanDeserializer(DeserializationConfig config,
DeserializerProvider p, JavaType type, BeanProperty property)
throws JsonMappingException
{
Class cls = type.getRawClass();
// note: we do NOT check for custom deserializers here; that's for sub-class to do
JsonDeserializer deser = _simpleDeserializers.get(new ClassKey(cls));
if (deser != null) {
return deser;
}
// [JACKSON-283]: AtomicReference is a rather special type...
if (AtomicReference.class.isAssignableFrom(cls)) {
// Must find parameterization
TypeFactory tf = config.getTypeFactory();
JavaType[] params = tf.findTypeParameters(type, AtomicReference.class);
JavaType referencedType;
if (params == null || params.length < 1) { // untyped (raw)
referencedType = TypeFactory.unknownType();
} else {
referencedType = params[0];
}
JsonDeserializer d2 = new AtomicReferenceDeserializer(referencedType, property);
return (JsonDeserializer)d2;
}
// [JACKSON-386]: External/optional type handlers are handled somewhat differently
JsonDeserializer d = optionalHandlers.findDeserializer(type, config, p);
if (d != null) {
return (JsonDeserializer)d;
}
return null;
}
@Override
public TypeDeserializer findTypeDeserializer(DeserializationConfig config, JavaType baseType,
BeanProperty property)
throws JsonMappingException
{
Class cls = baseType.getRawClass();
BasicBeanDescription bean = config.introspectClassAnnotations(cls);
AnnotatedClass ac = bean.getClassInfo();
AnnotationIntrospector ai = config.getAnnotationIntrospector();
TypeResolverBuilder b = ai.findTypeResolver(config, ac, baseType);
/* Ok: if there is no explicit type info handler, we may want to
* use a default. If so, config object knows what to use.
*/
Collection subtypes = null;
if (b == null) {
b = config.getDefaultTyper(baseType);
if (b == null) {
return null;
}
} else {
subtypes = config.getSubtypeResolver().collectAndResolveSubtypes(ac, config, ai);
}
// [JACKSON-505]: May need to figure out default implementation, if none found yet
// (note: check for abstract type is not 100% mandatory, more of an optimization)
if ((b.getDefaultImpl() == null) && baseType.isAbstract()) {
JavaType defaultType = mapAbstractType(config, baseType);
if (defaultType != null && defaultType.getRawClass() != baseType.getRawClass()) {
b = b.defaultImpl(defaultType.getRawClass());
}
}
return b.buildTypeDeserializer(config, baseType, subtypes, property);
}
/*
/**********************************************************
/* Extended API
/**********************************************************
*/
/**
* Method called to create a type information deserializer for values of
* given non-container property, if one is needed.
* If not needed (no polymorphic handling configured for property), should return null.
*
* Note that this method is only called for non-container bean properties,
* and not for values in container types or root values (or container properties)
*
* @param baseType Declared base type of the value to deserializer (actual
* deserializer type will be this type or its subtype)
*
* @return Type deserializer to use for given base type, if one is needed; null if not.
*
* @since 1.5
*/
public TypeDeserializer findPropertyTypeDeserializer(DeserializationConfig config, JavaType baseType,
AnnotatedMember annotated, BeanProperty property)
throws JsonMappingException
{
AnnotationIntrospector ai = config.getAnnotationIntrospector();
TypeResolverBuilder b = ai.findPropertyTypeResolver(config, annotated, baseType);
// Defaulting: if no annotations on member, check value class
if (b == null) {
return findTypeDeserializer(config, baseType, property);
}
// but if annotations found, may need to resolve subtypes:
Collection subtypes = config.getSubtypeResolver().collectAndResolveSubtypes(annotated, config, ai);
return b.buildTypeDeserializer(config, baseType, subtypes, property);
}
/**
* Method called to find and create a type information deserializer for values of
* given container (list, array, map) property, if one is needed.
* If not needed (no polymorphic handling configured for property), should return null.
*
* Note that this method is only called for container bean properties,
* and not for values in container types or root values (or non-container properties)
*
* @param containerType Type of property; must be a container type
* @param propertyEntity Field or method that contains container property
*
* @since 1.5
*/
public TypeDeserializer findPropertyContentTypeDeserializer(DeserializationConfig config, JavaType containerType,
AnnotatedMember propertyEntity, BeanProperty property)
throws JsonMappingException
{
AnnotationIntrospector ai = config.getAnnotationIntrospector();
TypeResolverBuilder b = ai.findPropertyContentTypeResolver(config, propertyEntity, containerType);
JavaType contentType = containerType.getContentType();
// Defaulting: if no annotations on member, check class
if (b == null) {
return findTypeDeserializer(config, contentType, property);
}
// but if annotations found, may need to resolve subtypes:
Collection subtypes = config.getSubtypeResolver().collectAndResolveSubtypes(propertyEntity, config, ai);
return b.buildTypeDeserializer(config, contentType, subtypes, property);
}
/*
/**********************************************************
/* Helper methods, value/content/key type introspection
/**********************************************************
*/
/**
* Helper method called to check if a class or method
* has annotation that tells which class to use for deserialization.
* Returns null if no such annotation found.
*/
protected JsonDeserializer findDeserializerFromAnnotation(DeserializationConfig config,
Annotated ann, BeanProperty property)
throws JsonMappingException
{
Object deserDef = config.getAnnotationIntrospector().findDeserializer(ann);
if (deserDef != null) {
return _constructDeserializer(config, ann, property, deserDef);
}
return null;
}
@SuppressWarnings("unchecked")
JsonDeserializer _constructDeserializer(DeserializationConfig config, Annotated ann, BeanProperty property,
Object deserDef)
throws JsonMappingException
{
if (deserDef instanceof JsonDeserializer) {
JsonDeserializer deser = (JsonDeserializer) deserDef;
// related to [JACKSON-569], need contextualization:
if (deser instanceof ContextualDeserializer) {
deser = (JsonDeserializer)((ContextualDeserializer) deser).createContextual(config, property);
}
return deser;
}
/* Alas, there's no way to force return type of "either class
* X or Y" -- need to throw an exception after the fact
*/
if (!(deserDef instanceof Class)) {
throw new IllegalStateException("AnnotationIntrospector returned deserializer definition of type "+deserDef.getClass().getName()+"; expected type JsonDeserializer or Class instead");
}
Class> deserClass = (Class>) deserDef;
if (!JsonDeserializer.class.isAssignableFrom(deserClass)) {
throw new IllegalStateException("AnnotationIntrospector returned Class "+deserClass.getName()+"; expected Class");
}
JsonDeserializer deser = config.deserializerInstance(ann, deserClass);
// related to [JACKSON-569], need contextualization:
if (deser instanceof ContextualDeserializer) {
deser = (JsonDeserializer)((ContextualDeserializer) deser).createContextual(config, property);
}
return deser;
}
/**
* Method called to see if given method has annotations that indicate
* a more specific type than what the argument specifies.
* If annotations are present, they must specify compatible Class;
* instance of which can be assigned using the method. This means
* that the Class has to be raw class of type, or its sub-class
* (or, implementing class if original Class instance is an interface).
*
* @param a Method or field that the type is associated with
* @param type Type derived from the setter argument
* @param propName Name of property that refers to type, if any; null
* if no property information available (when modify type declaration
* of a class, for example)
*
* @return Original type if no annotations are present; or a more
* specific type derived from it if type annotation(s) was found
*
* @throws JsonMappingException if invalid annotation is found
*/
@SuppressWarnings({ "unchecked", "deprecation" })
protected T modifyTypeByAnnotation(DeserializationConfig config,
Annotated a, T type, String propName)
throws JsonMappingException
{
// first: let's check class for the instance itself:
AnnotationIntrospector intr = config.getAnnotationIntrospector();
Class subclass = intr.findDeserializationType(a, type, propName);
if (subclass != null) {
try {
type = (T) type.narrowBy(subclass);
} catch (IllegalArgumentException iae) {
throw new JsonMappingException("Failed to narrow type "+type+" with concrete-type annotation (value "+subclass.getName()+"), method '"+a.getName()+"': "+iae.getMessage(), null, iae);
}
}
// then key class
if (type.isContainerType()) {
Class keyClass = intr.findDeserializationKeyType(a, type.getKeyType(), propName);
if (keyClass != null) {
// illegal to use on non-Maps
if (!(type instanceof MapLikeType)) {
throw new JsonMappingException("Illegal key-type annotation: type "+type+" is not a Map(-like) type");
}
try {
type = (T) ((MapLikeType) type).narrowKey(keyClass);
} catch (IllegalArgumentException iae) {
throw new JsonMappingException("Failed to narrow key type "+type+" with key-type annotation ("+keyClass.getName()+"): "+iae.getMessage(), null, iae);
}
}
JavaType keyType = type.getKeyType();
/* 21-Mar-2011, tatu: ... and associated deserializer too (unless already assigned)
* (not 100% why or how, but this does seem to get called more than once, which
* is not good: for now, let's just avoid errors)
*/
if (keyType != null && keyType.getValueHandler() == null) {
Class kdClass = intr.findKeyDeserializer(a);
if (kdClass != null && kdClass != KeyDeserializer.None.class) {
KeyDeserializer kd = config.keyDeserializerInstance(a, kdClass);
// !!! TODO: For 2.0, change to use this instead:
/*
type = (T) ((MapLikeType) type).withKeyValueHandler(kd);
keyType = type.getKeyType(); // just in case it's used below
*/
keyType.setValueHandler(kd);
}
}
// and finally content class; only applicable to structured types
Class cc = intr.findDeserializationContentType(a, type.getContentType(), propName);
if (cc != null) {
try {
type = (T) type.narrowContentsBy(cc);
} catch (IllegalArgumentException iae) {
throw new JsonMappingException("Failed to narrow content type "+type+" with content-type annotation ("+cc.getName()+"): "+iae.getMessage(), null, iae);
}
}
// ... as well as deserializer for contents:
JavaType contentType = type.getContentType();
if (contentType.getValueHandler() == null) { // as with above, avoid resetting (which would trigger exception)
Class> cdClass = intr.findContentDeserializer(a);
if (cdClass != null && cdClass != JsonDeserializer.None.class) {
JsonDeserializer cd = config.deserializerInstance(a, cdClass);
// !!! TODO: For 2.0, change to use this instead:
/*
type = (T) type.withContentValueHandler(cd);
*/
type.getContentType().setValueHandler(cd);
}
}
}
return type;
}
/**
* Helper method used to resolve method return types and field
* types. The main trick here is that the containing bean may
* have type variable binding information (when deserializing
* using generic type passed as type reference), which is
* needed in some cases.
*
* Starting with version 1.3, this method will also resolve instances
* of key and content deserializers if defined by annotations.
*/
@SuppressWarnings("deprecation")
protected JavaType resolveType(DeserializationConfig config,
BasicBeanDescription beanDesc, JavaType type, AnnotatedMember member,
BeanProperty property)
throws JsonMappingException
{
// [JACKSON-154]: Also need to handle keyUsing, contentUsing
if (type.isContainerType()) {
AnnotationIntrospector intr = config.getAnnotationIntrospector();
JavaType keyType = type.getKeyType();
if (keyType != null) {
Class kdClass = intr.findKeyDeserializer(member);
if (kdClass != null && kdClass != KeyDeserializer.None.class) {
KeyDeserializer kd = config.keyDeserializerInstance(member, kdClass);
// !!! TODO: For 2.0, change to use this instead:
/*
type = ((MapLikeType) type).withKeyValueHandler(kd);
keyType = type.getKeyType(); // just in case it's used below
*/
keyType.setValueHandler(kd);
}
}
// and all container types have content types...
Class> cdClass = intr.findContentDeserializer(member);
if (cdClass != null && cdClass != JsonDeserializer.None.class) {
JsonDeserializer cd = config.deserializerInstance(member, cdClass);
// !!! TODO: For 2.0, change to use this instead:
/*
type = type.withContentValueHandler(cd);
*/
type.getContentType().setValueHandler(cd);
}
/* 04-Feb-2010, tatu: Need to figure out JAXB annotations that indicate type
* information to use for polymorphic members; and specifically types for
* collection values (contents).
* ... but only applies to members (fields, methods), not classes
*/
if (member instanceof AnnotatedMember) {
TypeDeserializer contentTypeDeser = findPropertyContentTypeDeserializer(config, type,
(AnnotatedMember) member, property);
if (contentTypeDeser != null) {
type = type.withContentTypeHandler(contentTypeDeser);
}
}
}
TypeDeserializer valueTypeDeser;
if (member instanceof AnnotatedMember) { // JAXB allows per-property annotations
valueTypeDeser = findPropertyTypeDeserializer(config, type, (AnnotatedMember) member, property);
} else { // classes just have Jackson annotations
// probably only occurs if 'property' is null anyway
valueTypeDeser = findTypeDeserializer(config, type, null);
}
if (valueTypeDeser != null) {
type = type.withTypeHandler(valueTypeDeser);
}
return type;
}
protected EnumResolver constructEnumResolver(Class enumClass, DeserializationConfig config)
{
// [JACKSON-212]: may need to use Enum.toString()
if (config.isEnabled(DeserializationConfig.Feature.READ_ENUMS_USING_TO_STRING)) {
return EnumResolver.constructUnsafeUsingToString(enumClass);
}
return EnumResolver.constructUnsafe(enumClass, config.getAnnotationIntrospector());
}
}
