@Override
public JavaType narrowContentsBy(Class<?> contentClass) {
// Can do a quick check first:
if (contentClass == _elementType.getRawClass()) {
return this;
}
return new CollectionLikeType(
_class, _elementType.narrowBy(contentClass), _valueHandler, _typeHandler);
}
/**
* 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
* @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
*/
private JavaType modifyTypeByAnnotation(DeserializationContext ctxt, Annotated a, JavaType type)
throws JsonMappingException {
// first: let's check class for the instance itself:
AnnotationIntrospector intr = ctxt.getAnnotationIntrospector();
Class<?> subclass = intr.findDeserializationType(a, type);
if (subclass != null) {
try {
type = 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());
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 = ((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) {
Object kdDef = intr.findKeyDeserializer(a);
if (kdDef != null) {
KeyDeserializer kd = ctxt.keyDeserializerInstance(a, kdDef);
if (kd != null) {
type = ((MapLikeType) type).withKeyValueHandler(kd);
keyType = type.getKeyType(); // just in case it's used below
}
}
}
// and finally content class; only applicable to structured types
Class<?> cc = intr.findDeserializationContentType(a, type.getContentType());
if (cc != null) {
try {
type = 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)
Object cdDef = intr.findContentDeserializer(a);
if (cdDef != null) {
JsonDeserializer<?> cd = null;
if (cdDef instanceof JsonDeserializer<?>) {
cdDef = (JsonDeserializer<?>) cdDef;
} else {
Class<?> cdClass =
_verifyAsClass(cdDef, "findContentDeserializer", JsonDeserializer.None.class);
if (cdClass != null) {
cd = ctxt.deserializerInstance(a, cdClass);
}
}
if (cd != null) {
type = type.withContentValueHandler(cd);
}
}
}
}
return type;
}