/**
* Helper method called to construct and initialize instance of {@link TypeResolverBuilder} if
* given annotated element indicates one is needed.
*/
@SuppressWarnings("deprecation")
protected TypeResolverBuilder<?> _findTypeResolver(
MapperConfig<?> config, Annotated ann, JavaType baseType) {
// First: maybe we have explicit type resolver?
TypeResolverBuilder<?> b;
JsonTypeInfo info = _findAnnotation(ann, JsonTypeInfo.class);
JsonTypeResolver resAnn = _findAnnotation(ann, JsonTypeResolver.class);
if (resAnn != null) {
if (info == null) {
return null;
}
/* let's not try to force access override (would need to pass
* settings through if we did, since that's not doable on some
* platforms)
*/
b = config.typeResolverBuilderInstance(ann, resAnn.value());
} else { // if not, use standard one, if indicated by annotations
if (info == null) {
return null;
}
// bit special; must return 'marker' to block use of default typing:
if (info.use() == JsonTypeInfo.Id.NONE) {
return _constructNoTypeResolverBuilder();
}
b = _constructStdTypeResolverBuilder();
}
// Does it define a custom type id resolver?
JsonTypeIdResolver idResInfo = _findAnnotation(ann, JsonTypeIdResolver.class);
TypeIdResolver idRes =
(idResInfo == null) ? null : config.typeIdResolverInstance(ann, idResInfo.value());
if (idRes != null) { // [JACKSON-359]
idRes.init(baseType);
}
b = b.init(info.use(), idRes);
/* 13-Aug-2011, tatu: One complication wrt [JACKSON-453]; external id
* only works for properties; so if declared for a Class, we will need
* to map it to "PROPERTY" instead of "EXTERNAL_PROPERTY"
*/
JsonTypeInfo.As inclusion = info.include();
if (inclusion == JsonTypeInfo.As.EXTERNAL_PROPERTY && (ann instanceof AnnotatedClass)) {
inclusion = JsonTypeInfo.As.PROPERTY;
}
b = b.inclusion(inclusion);
b = b.typeProperty(info.property());
Class<?> defaultImpl = info.defaultImpl();
// 08-Dec-2014, tatu: To deprecated `JsonTypeInfo.None` we need to use other placeholder(s);
// and since `java.util.Void` has other purpose (to indicate "deser as null"), we'll instead
// use `JsonTypeInfo.class` itself. But any annotation type will actually do, as they have no
// valid use (can not instantiate as default)
if (defaultImpl != JsonTypeInfo.None.class && !defaultImpl.isAnnotation()) {
b = b.defaultImpl(defaultImpl);
}
b = b.typeIdVisibility(info.visible());
return b;
}
/**
* @return Null if class might be a bean; type String (that identifies why it's not a bean) if not
*/
public static String canBeABeanType(Class<?> type) {
// First: language constructs that ain't beans:
if (type.isAnnotation()) {
return "annotation";
}
if (type.isArray()) {
return "array";
}
if (type.isEnum()) {
return "enum";
}
if (type.isPrimitive()) {
return "primitive";
}
// Anything else? Seems valid, then
return null;
}