DATACMNS-1767 - Polishing.

Reformat code. Use reflection for property access when running within a native image.

Original pull request: #456.

src/main/java/org/springframework/data/mapping/context/AbstractMappingContext.java

@@ -44,6 +44,7 @@ import org.springframework.data.mapping.PersistentProperty;
 import org.springframework.data.mapping.PersistentPropertyPath;
 import org.springframework.data.mapping.PersistentPropertyPaths;
 import org.springframework.data.mapping.PropertyPath;
+import org.springframework.data.mapping.model.BeanWrapperPropertyAccessorFactory;
 import org.springframework.data.mapping.model.ClassGeneratingPropertyAccessorFactory;
 import org.springframework.data.mapping.model.EntityInstantiators;
 import org.springframework.data.mapping.model.InstantiationAwarePropertyAccessorFactory;
@@ -85,6 +86,8 @@ import org.springframework.util.ReflectionUtils.FieldFilter;
 public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?, P>, P extends PersistentProperty<P>>
 		implements MappingContext<E, P>, ApplicationEventPublisherAware, ApplicationContextAware, InitializingBean {
 
+	private static final boolean IN_NATIVE_IMAGE = System.getProperty("org.graalvm.nativeimage.imagecode") != null;
+
 	private final Optional<E> NONE = Optional.empty();
 	private final Map<TypeInformation<?>, Optional<E>> persistentEntities = new HashMap<>();
 	private final PersistentPropertyAccessorFactory persistentPropertyAccessorFactory;
@@ -106,7 +109,8 @@ public abstract class AbstractMappingContext<E extends MutablePersistentEntity<?
 		this.persistentPropertyPathFactory = new PersistentPropertyPathFactory<>(this);
 
 		EntityInstantiators instantiators = new EntityInstantiators();
-		ClassGeneratingPropertyAccessorFactory accessorFactory = new ClassGeneratingPropertyAccessorFactory();
+		PersistentPropertyAccessorFactory accessorFactory = IN_NATIVE_IMAGE ? BeanWrapperPropertyAccessorFactory.INSTANCE
+				: new ClassGeneratingPropertyAccessorFactory();
 
 		this.persistentPropertyAccessorFactory = new InstantiationAwarePropertyAccessorFactory(accessorFactory,
 				instantiators);

src/main/java/org/springframework/data/mapping/model/BeanWrapperPropertyAccessorFactory.java

@@ -23,7 +23,7 @@ import org.springframework.data.mapping.PersistentPropertyAccessor;
  *
  * @author Oliver Gierke
  */
-enum BeanWrapperPropertyAccessorFactory implements PersistentPropertyAccessorFactory {
+public enum BeanWrapperPropertyAccessorFactory implements PersistentPropertyAccessorFactory {
 
 	INSTANCE;
 

src/main/java/org/springframework/data/mapping/model/ClassGeneratingEntityInstantiator.java

@@ -142,9 +142,9 @@ class ClassGeneratingEntityInstantiator implements EntityInstantiator {
 	 */
 	boolean shouldUseReflectionEntityInstantiator(PersistentEntity<?, ?> entity) {
 
-		if(IN_NATIVE_IMAGE) {
+		if (IN_NATIVE_IMAGE) {
 
-			if(LOGGER.isDebugEnabled()) {
+			if (LOGGER.isDebugEnabled()) {
 				LOGGER.debug(String.format("graalvm.nativeimage - fall back to reflection for %s.", entity.getName()));
 			}