Refactored BasicMappingContext into AbstractMappingContext that now only contains the general algorithm to build PersistentEntity and PersistentProperty instances. The algorithm delegates to two template methods that are responsible for instantiating concrete implementations of those classes.
Extracted an AnnotationBasedPersistentProperty that now contains all annotation references so that AbstractPersistentEntity does not take annotations into account in the first places. BasicPersistentEntity now does PreferredConstructor lookup as well.
Removed unnecessary methods from MappingCOntext and PersistentEntity interface. Added a verify() method to BasicPersistentEntity that AbstractMappingContext calls to verify validity of the entity. This will be used by the Mongo module for example to make sure @Document annotated entities have an @Id property.
Refactored getValueAnnotation() to getSpelExpression() to not imply we're using annotations in every case.
Added shortcut in TypeDiscoverer.createInfo(…) to prevent endless loop in case a type has a field of it's very same type.
TypeDiscoverer now returns the plain compound type for arrays now, which means you get String for String[], String[][] and so on. Opened up signature of AbstractMappingContext.setInitialEntitySet(…) to allow effortless programatic invocation.
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