DATACMNS-1158 - ProjectionFactory is now configurable by module implementations.

Introduced RepositoryFactorySupport.getProjectionFactory(…) to create a ProjectionFactory to be used for repository instances created. The default implementation uses the SpelAwareProxyProjectionFactory.

The ProjectionInformation implementation is now a named class so it can be used for more specialized implementations.

Original pull request: #243.
Related issue: DATAJPA-1173.

src/main/java/org/springframework/data/projection/SpelAwareProxyProjectionFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2016 the original author or authors.
+ * Copyright 2015-2017 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.
@@ -39,6 +39,7 @@ import org.springframework.util.ReflectionUtils;
  * @author Oliver Gierke
  * @author Thomas Darimont
  * @author Mark Paluch
+ * @author Jens Schauder
  * @since 1.10
  */
 public class SpelAwareProxyProjectionFactory extends ProxyProjectionFactory implements BeanFactoryAware {
@@ -63,29 +64,7 @@ public class SpelAwareProxyProjectionFactory extends ProxyProjectionFactory impl
 	 */
 	@Override
 	protected ProjectionInformation createProjectionInformation(Class<?> projectionType) {
-
-		return new DefaultProjectionInformation(projectionType) {
-
-			/* 
-			 * (non-Javadoc)
-			 * @see org.springframework.data.projection.DefaultProjectionInformation#isInputProperty(java.beans.PropertyDescriptor)
-			 */
-			@Override
-			protected boolean isInputProperty(PropertyDescriptor descriptor) {
-
-				if (!super.isInputProperty(descriptor)) {
-					return false;
-				}
-
-				Method readMethod = descriptor.getReadMethod();
-
-				if (readMethod == null) {
-					return false;
-				}
-
-				return AnnotationUtils.findAnnotation(readMethod, Value.class) == null;
-			}
-		};
+		return new SpelAwareProjectionInformation(projectionType);
 	}
 
 	/**
@@ -121,4 +100,31 @@ public class SpelAwareProxyProjectionFactory extends ProxyProjectionFactory impl
 
 		return callback.hasFoundAnnotation();
 	}
+
+	protected static class SpelAwareProjectionInformation extends DefaultProjectionInformation {
+
+		protected SpelAwareProjectionInformation(Class<?> projectionType) {
+			super(projectionType);
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * @see org.springframework.data.projection.DefaultProjectionInformation#isInputProperty(java.beans.PropertyDescriptor)
+		 */
+		@Override
+		protected boolean isInputProperty(PropertyDescriptor descriptor) {
+
+			if (!super.isInputProperty(descriptor)) {
+				return false;
+			}
+
+			Method readMethod = descriptor.getReadMethod();
+
+			if (readMethod == null) {
+				return false;
+			}
+
+			return AnnotationUtils.findAnnotation(readMethod, Value.class) == null;
+		}
+	}
 }

src/main/java/org/springframework/data/repository/core/support/RepositoryFactorySupport.java

@@ -34,6 +34,7 @@ import java.util.stream.Collectors;
 
 import org.aopalliance.intercept.MethodInterceptor;
 import org.aopalliance.intercept.MethodInvocation;
+import org.jetbrains.annotations.NotNull;
 import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.aop.interceptor.ExposeInvocationInterceptor;
 import org.springframework.beans.BeanUtils;
@@ -45,6 +46,7 @@ import org.springframework.core.MethodParameter;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor;
+import org.springframework.data.projection.ProjectionFactory;
 import org.springframework.data.projection.SpelAwareProxyProjectionFactory;
 import org.springframework.data.repository.Repository;
 import org.springframework.data.repository.core.EntityInformation;
@@ -77,6 +79,7 @@ import org.springframework.util.ConcurrentReferenceHashMap.ReferenceType;
  * @author Oliver Gierke
  * @author Mark Paluch
  * @author Christoph Strobl
+ * @author Jens Schauder
  */
 public abstract class RepositoryFactorySupport implements BeanClassLoaderAware, BeanFactoryAware {
 
@@ -312,7 +315,10 @@ public abstract class RepositoryFactorySupport implements BeanClassLoaderAware,
 		postProcessors.forEach(processor -> processor.postProcess(result, information));
 
 		result.addAdvice(new DefaultMethodInvokingMethodInterceptor());
-		result.addAdvice(new QueryExecutorMethodInterceptor(information));
+		result.addAdvice(new QueryExecutorMethodInterceptor( //
+				information, //
+				getProjectionFactory(classLoader, beanFactory) //
+		));
 
 		composition = composition.append(RepositoryFragment.implemented(target));
 		result.addAdvice(new ImplementationMethodExecutionInterceptor(composition));
@@ -320,6 +326,16 @@ public abstract class RepositoryFactorySupport implements BeanClassLoaderAware,
 		return (T) result.getProxy(classLoader);
 	}
 
+	@NotNull
+	protected ProjectionFactory getProjectionFactory(ClassLoader classLoader, BeanFactory beanFactory) {
+
+		SpelAwareProxyProjectionFactory factory = new SpelAwareProxyProjectionFactory();
+		factory.setBeanClassLoader(classLoader);
+		factory.setBeanFactory(beanFactory);
+
+		return factory;
+	}
+
 	/**
 	 * Returns the {@link RepositoryMetadata} for the given repository interface.
 	 *
@@ -501,7 +517,8 @@ public abstract class RepositoryFactorySupport implements BeanClassLoaderAware,
 		 * Creates a new {@link QueryExecutorMethodInterceptor}. Builds a model of {@link QueryMethod}s to be invoked on
 		 * execution of repository interface methods.
 		 */
-		public QueryExecutorMethodInterceptor(RepositoryInformation repositoryInformation) {
+		public QueryExecutorMethodInterceptor(RepositoryInformation repositoryInformation,
+				ProjectionFactory projectionFactory) {
 
 			this.resultHandler = new QueryExecutionResultHandler();
 
@@ -515,18 +532,20 @@ public abstract class RepositoryFactorySupport implements BeanClassLoaderAware,
 						+ "infrastructure apparently does not support query methods!");
 			}
 
-			this.queries = lookupStrategy.map(it -> {
+			this.queries = lookupStrategy.map( //
+					it -> mapMethodsToQuery(repositoryInformation, projectionFactory, it) //
+			).orElse(Collections.emptyMap());
+		}
 
-				SpelAwareProxyProjectionFactory factory = new SpelAwareProxyProjectionFactory();
-				factory.setBeanClassLoader(classLoader);
-				factory.setBeanFactory(beanFactory);
+		private Map<Method, RepositoryQuery> mapMethodsToQuery(RepositoryInformation repositoryInformation,
+				ProjectionFactory projectionFactory, QueryLookupStrategy lookupStrategy) {
 
-				return repositoryInformation.getQueryMethods().stream()//
-						.map(method -> Pair.of(method, it.resolveQuery(method, repositoryInformation, factory, namedQueries)))//
-						.peek(pair -> invokeListeners(pair.getSecond()))//
-						.collect(Pair.toMap());
-
-			}).orElse(Collections.emptyMap());
+			return repositoryInformation.getQueryMethods().stream() //
+					.map(method -> Pair.of( //
+							method, //
+							lookupStrategy.resolveQuery(method, repositoryInformation, projectionFactory, namedQueries))) //
+					.peek(pair -> invokeListeners(pair.getSecond())) //
+					.collect(Pair.toMap());
 		}
 
 		@SuppressWarnings({ "rawtypes", "unchecked" })