DATAJPA-1497 - Polishing.

Moved JpaQueryMethodFactory creation into a separate class.
Removed http URL in copyright statement.
Simplified bean injection of JpaQueryMethodFactory.build

Originial pull request: #305.

Signed-off-by: Jens Schauder <jschauder@pivotal.io>

src/main/java/org/springframework/data/jpa/repository/query/DefaultJpaQueryMethodFactory.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2019 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.jpa.repository.query;
+
+import java.lang.reflect.Method;
+
+import org.springframework.data.jpa.provider.QueryExtractor;
+import org.springframework.data.projection.ProjectionFactory;
+import org.springframework.data.repository.core.RepositoryMetadata;
+import org.springframework.util.Assert;
+
+/**
+ * A factory for creating {@link JpaQueryMethod} instances.
+ * 
+ * @author Jens Schauder
+ * @since 2.3
+ */
+public class DefaultJpaQueryMethodFactory implements JpaQueryMethodFactory {
+
+	private final QueryExtractor extractor;
+
+	public DefaultJpaQueryMethodFactory(QueryExtractor extractor) {
+
+		Assert.notNull(extractor, "QueryExtractor must not be null");
+
+		this.extractor = extractor;
+	}
+
+	@Override
+	public JpaQueryMethod build(Method method, RepositoryMetadata metadata, ProjectionFactory factory) {
+		return new JpaQueryMethod(method, metadata, factory, extractor);
+	}
+}

src/main/java/org/springframework/data/jpa/repository/query/JpaQueryMethod.java

@@ -90,20 +90,6 @@ public class JpaQueryMethod extends QueryMethod {
 	private final Lazy<Boolean> isProcedureQuery;
 	private final Lazy<JpaEntityMetadata<?>> entityMetadata;
 
-	/**
-	 * Creates a {@link JpaQueryMethodFactory} which will create instances of this class.
-	 * 
-	 * @param extractor must not be {@literal null}.
-	 * @return a {@link JpaQueryMethodFactory} guaranteed to be not {@literal null}.
-	 * @since 2.3
-	 */
-	public static JpaQueryMethodFactory createMethodFactory(QueryExtractor extractor) {
-
-		Assert.notNull(extractor, "QueryExtractor must not be null");
-
-		return (method, metadata, factory) -> new JpaQueryMethod(method, metadata, factory, extractor);
-	}
-
 	/**
 	 * Creates a {@link JpaQueryMethod}.
 	 *

src/main/java/org/springframework/data/jpa/repository/query/JpaQueryMethodFactory.java

@@ -1,11 +1,11 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
  * You may obtain a copy of the License at
  *
- *      http://www.apache.org/licenses/LICENSE-2.0
+ *      https://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
@@ -17,14 +17,12 @@ package org.springframework.data.jpa.repository.query;
 
 import java.lang.reflect.Method;
 
-import org.springframework.data.jpa.provider.QueryExtractor;
 import org.springframework.data.projection.ProjectionFactory;
 import org.springframework.data.repository.core.RepositoryMetadata;
 
 /**
- * A factory interface for creating {@link JpaQueryMethodFactory} instances.
- *
- * This may be implemented by extensions to Spring Data JPA in order create instances of custom subclasses.
+ * A factory interface for creating {@link JpaQueryMethodFactory} instances. This may be implemented by extensions to
+ * Spring Data JPA in order create instances of custom subclasses.
  *
  * @author Réda Housni Alaoui
  * @since 2.3

src/main/java/org/springframework/data/jpa/repository/support/JpaRepositoryFactory.java

@@ -34,6 +34,7 @@ import org.springframework.data.jpa.provider.PersistenceProvider;
 import org.springframework.data.jpa.provider.QueryExtractor;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.query.AbstractJpaQuery;
+import org.springframework.data.jpa.repository.query.DefaultJpaQueryMethodFactory;
 import org.springframework.data.jpa.repository.query.EscapeCharacter;
 import org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy;
 import org.springframework.data.jpa.repository.query.JpaQueryMethod;
@@ -91,7 +92,7 @@ public class JpaRepositoryFactory extends RepositoryFactorySupport {
 		this.extractor = PersistenceProvider.fromEntityManager(entityManager);
 		this.crudMethodMetadataPostProcessor = new CrudMethodMetadataPostProcessor();
 		this.entityPathResolver = SimpleEntityPathResolver.INSTANCE;
-		this.queryMethodFactory = JpaQueryMethod.createMethodFactory(extractor);
+		this.queryMethodFactory = new DefaultJpaQueryMethodFactory(extractor);
 
 		addRepositoryProxyPostProcessor(crudMethodMetadataPostProcessor);
 		addRepositoryProxyPostProcessor((factory, repositoryInformation) -> {

src/main/java/org/springframework/data/jpa/repository/support/JpaRepositoryFactoryBean.java

@@ -20,9 +20,7 @@ import javax.persistence.PersistenceContext;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.data.jpa.provider.QueryExtractor;
 import org.springframework.data.jpa.repository.query.EscapeCharacter;
-import org.springframework.data.jpa.repository.query.JpaQueryMethod;
 import org.springframework.data.jpa.repository.query.JpaQueryMethodFactory;
 import org.springframework.data.mapping.context.MappingContext;
 import org.springframework.data.querydsl.EntityPathResolver;
@@ -92,14 +90,18 @@ public class JpaRepositoryFactoryBean<T extends Repository<S, ID>, S, ID>
 	}
 
 	/**
-	 * Configures the {@link JpaQueryMethodFactory} to be used. Will expect a canonical bean to be present but will fallback to
-	 * {@link JpaQueryMethod#createMethodFactory(QueryExtractor)} in case none is available.
+	 * Configures the {@link JpaQueryMethodFactory} to be used. Will expect a canonical bean to be present but will
+	 * fallback to {@link org.springframework.data.jpa.repository.query.DefaultJpaQueryMethodFactory} in case none is
+	 * available.
 	 *
-	 * @param resolver must not be {@literal null}.
+	 * @param factory may be {@literal null}.
 	 */
 	@Autowired
-	public void setQueryMethodFactory(ObjectProvider<JpaQueryMethodFactory> resolver) {
-		this.queryMethodFactory = resolver.getIfAvailable(() -> null);
+	public void setQueryMethodFactory(@Nullable JpaQueryMethodFactory factory) {
+
+		if (factory != null) {
+			this.queryMethodFactory = factory;
+		}
 	}
 
 	/*

src/test/java/org/springframework/data/jpa/repository/query/JpaQueryLookupStrategyUnitTests.java

@@ -15,9 +15,9 @@
  */
 package org.springframework.data.jpa.repository.query;
 
-import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
-import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.when;
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
 
 import java.lang.reflect.Method;
 import java.util.List;
@@ -73,7 +73,7 @@ public class JpaQueryLookupStrategyUnitTests {
 		when(em.getEntityManagerFactory()).thenReturn(emf);
 		when(emf.createEntityManager()).thenReturn(em);
 		when(em.getDelegate()).thenReturn(em);
-		queryMethodFactory = JpaQueryMethod.createMethodFactory(extractor);
+		queryMethodFactory = new DefaultJpaQueryMethodFactory(extractor);
 	}
 
 	@Test // DATAJPA-226