We now have a refined replica of the EvaluationContextProvider API and SPIs in the org.springframework.data.spel package. It has seen a bit of a Java 8 overhaul by removing the SPI support class in favor of turning most methods in EvaluationContextExtension into default ones.
The already existing API has been renamed to QueryMethodEvaluationContextProvider to indicate it's working with additional semantics specific to query methods (i.e. the Parameters metadata). The internals have been refactored to use the new API but still detect implementations of the old EvaluationContextExtension interface. The implementations get wrapped into an adapting proxy to satisfy the new API so that the actual inspection and usage of the extension is now already done using the new APIs.
The repository configuration has slightly change so that the creation of the EvaluationContextProvider is now taking place within RepositoryFactoryBeanSupport's implementation of BeanFactoryAware.
AbstractMappingContext is now ApplicationContextAware and holds an ExtensionAwareEvaluationContextProvider using the configured ApplicationContext. That EvaluationContextProvider is forwarded to all MutablePersistentEntity instances. BasicPersistentEntity now exposes getEvaluationContext(…) to subclasses to easily create an EvaluationContext using the extension aware infrastructure.
Removed DefaultEvaluationContextProvider in favor of a simple constant in QueryMethodEvaluationContextProvider.
Related tickets: DATACMNS-1258, DATACMNS-1108.
