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DATACMNS-89 - Infrastructure for projections on repository queries.

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QueryMethods now expose a ResourceProcessor which is exposes information about the final to be created object types which can either be DTOs containing a persistence constructor (see @PersistenceConstructor) or projection interfaces. The former are analyzed for constructor properties so that store implementations can use that information to create projected queries that return exactly the fields required for that DTO.

Projection interfaces are inspected, their properties are considered input properties and the same projection queries can be issued against the data store. If a projection contains dynamically calculated properties (i.e. it uses SpEL expressions via @Value) the original entities have to be queried and can be projected during post processing.

ProjectionFactory now exposes a more advanced ProjectionInformation that has additional meta information about the projection type. ProxyProjectionFactory now refers to the BeanClassLoader instead of the ResourceLoader.

RepositoryFactory(Bean)Support now also implement BeanFactoryAware to forward the BeanFactory to the SpelAwareProxyProjectionFactory which in turn now gets handed into the QueryLookupStrategy as well as the QueryMethod.

Parameter now knows about a dynamic projection type, which is a query method parameter of type Class bound to a generic method parameter and will be used to determine the projection to be used on a per call basis.

Original pull request: #150.
This commit is contained in:
Oliver Gierke
2015-11-27 22:42:41 +01:00
parent c60cd647cc
commit dbe79f89a9
28 changed files with 1523 additions and 97 deletions
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4
src/main/java/org/springframework/data/util/TypeInformation.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2008-2011 the original author or authors.
* Copyright 2008-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -21,7 +21,7 @@ import java.util.List;
/**
* Interface to access property types and resolving generics on the way. Starting with a {@link ClassTypeInformation}
* you can travers properties using {@link #getProperty(String)} to access type information.
* you can traverse properties using {@link #getProperty(String)} to access type information.
*
* @author Oliver Gierke
*/