Introduced QueryCreationListener that allows plugging in functionality after a query was created.
Heavily refactored QueryMethod and RepositoryQuery subsystem. Splitted up simple EntityMetadata (domain class and potentially other stuff) from the more advanced methods like getId(Object) and isNew(…). QueryMethod now carries a type enum that allows switching over it to determine the execution. Beyond that QueryMethod now returns a EntityMetadata rather than a plain class.
RepositoryQuery in turn exposes the query method. PartTree allows iterating over all contained Parts as well now. Introduced AbstractEntityInformation that regards an entity as new if its id is null. Simplified handling of RepositoryProxyPostProcessors and aligned them to QueryCreationListener handling.
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