DATACMNS-1102 - Reuse ConversionService in ProjectingMethodInterceptors created by ProxyProjectionFactory.

Applied the same to internals of MapDataBinder.

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

@@ -15,6 +15,9 @@
  */
 package org.springframework.data.projection;
 
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+
 import java.lang.reflect.Array;
 import java.util.Arrays;
 import java.util.Collection;
@@ -27,7 +30,6 @@ import org.aopalliance.intercept.MethodInterceptor;
 import org.aopalliance.intercept.MethodInvocation;
 import org.springframework.core.CollectionFactory;
 import org.springframework.core.convert.ConversionService;
-import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.data.util.ClassTypeInformation;
 import org.springframework.data.util.TypeInformation;
 import org.springframework.util.Assert;
@@ -41,29 +43,12 @@ import org.springframework.util.ObjectUtils;
  * @author Oliver Gierke
  * @since 1.10
  */
+@RequiredArgsConstructor
 class ProjectingMethodInterceptor implements MethodInterceptor {
 
-	private final ProjectionFactory factory;
-	private final MethodInterceptor delegate;
-	private final ConversionService conversionService;
-
-	/**
-	 * Creates a new {@link ProjectingMethodInterceptor} using the given {@link ProjectionFactory} and delegate
-	 * {@link MethodInterceptor}.
-	 * 
-	 * @param factory the {@link ProjectionFactory} to use to create projections if types do not match, must not be
-	 *          {@literal null}..
-	 * @param delegate the {@link MethodInterceptor} to trigger to create the source value, must not be {@literal null}..
-	 */
-	public ProjectingMethodInterceptor(ProjectionFactory factory, MethodInterceptor delegate) {
-
-		Assert.notNull(factory, "ProjectionFactory must not be null!");
-		Assert.notNull(delegate, "Delegate MethodInterceptor must not be null!");
-
-		this.factory = factory;
-		this.delegate = delegate;
-		this.conversionService = new DefaultConversionService();
-	}
+	private final @NonNull ProjectionFactory factory;
+	private final @NonNull MethodInterceptor delegate;
+	private final @NonNull ConversionService conversionService;
 
 	/* 
 	 * (non-Javadoc)

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

@@ -28,6 +28,8 @@ import org.springframework.aop.framework.Advised;
 import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.beans.factory.BeanClassLoaderAware;
 import org.springframework.context.ResourceLoaderAware;
+import org.springframework.core.convert.ConversionService;
+import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.core.io.ResourceLoader;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
@@ -49,6 +51,7 @@ class ProxyProjectionFactory implements ProjectionFactory, ResourceLoaderAware,
 			ProxyProjectionFactory.class.getClassLoader());
 
 	private final List<MethodInterceptorFactory> factories;
+	private final ConversionService conversionService;
 	private ClassLoader classLoader;
 
 	/**
@@ -59,6 +62,8 @@ class ProxyProjectionFactory implements ProjectionFactory, ResourceLoaderAware,
 		this.factories = new ArrayList<>();
 		this.factories.add(MapAccessingMethodInterceptorFactory.INSTANCE);
 		this.factories.add(PropertyAccessingMethodInvokerFactory.INSTANCE);
+
+		this.conversionService = new DefaultConversionService();
 	}
 
 	/**
@@ -176,7 +181,7 @@ class ProxyProjectionFactory implements ProjectionFactory, ResourceLoaderAware,
 				.createMethodInterceptor(source, projectionType);
 
 		return new ProjectingMethodInterceptor(this,
-				postProcessAccessorInterceptor(propertyInvocationInterceptor, source, projectionType));
+				postProcessAccessorInterceptor(propertyInvocationInterceptor, source, projectionType), conversionService);
 	}
 
 	/**

src/main/java/org/springframework/data/web/MapDataBinder.java

@@ -15,6 +15,9 @@
  */
 package org.springframework.data.web;
 
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+
 import java.beans.PropertyDescriptor;
 import java.util.HashMap;
 import java.util.List;
@@ -31,7 +34,6 @@ import org.springframework.core.CollectionFactory;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.TypeDescriptor;
-import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.data.mapping.PropertyPath;
 import org.springframework.data.mapping.PropertyReferenceException;
 import org.springframework.data.util.TypeInformation;
@@ -97,32 +99,15 @@ class MapDataBinder extends WebDataBinder {
 	 * @author Oliver Gierke
 	 * @since 1.10
 	 */
+	@RequiredArgsConstructor
 	private static class MapPropertyAccessor extends AbstractPropertyAccessor {
 
 		private static final SpelExpressionParser PARSER = new SpelExpressionParser(
 				new SpelParserConfiguration(false, true));
 
-		private final Class<?> type;
-		private final Map<String, Object> map;
-		private final ConversionService conversionService;
-
-		/**
-		 * Creates a new {@link MapPropertyAccessor} for the given type, map and {@link ConversionService}.
-		 * 
-		 * @param type must not be {@literal null}.
-		 * @param map must not be {@literal null}.
-		 * @param conversionService must not be {@literal null}.
-		 */
-		public MapPropertyAccessor(Class<?> type, Map<String, Object> map, ConversionService conversionService) {
-
-			Assert.notNull(type, "Type must not be null!");
-			Assert.notNull(map, "Map must not be null!");
-			Assert.notNull(conversionService, "ConversionService must not be null!");
-
-			this.type = type;
-			this.map = map;
-			this.conversionService = conversionService;
-		}
+		private final @NonNull Class<?> type;
+		private final @NonNull Map<String, Object> map;
+		private final @NonNull ConversionService conversionService;
 
 		/* 
 		 * (non-Javadoc)
@@ -177,7 +162,7 @@ class MapDataBinder extends WebDataBinder {
 			}
 
 			StandardEvaluationContext context = new StandardEvaluationContext();
-			context.addPropertyAccessor(new PropertyTraversingMapAccessor(type, new DefaultConversionService()));
+			context.addPropertyAccessor(new PropertyTraversingMapAccessor(type, conversionService));
 			context.setTypeConverter(new StandardTypeConverter(conversionService));
 			context.setRootObject(map);
 
@@ -290,7 +275,8 @@ class MapDataBinder extends WebDataBinder {
 				Class<?> actualPropertyType = path.getType();
 
 				TypeDescriptor valueDescriptor = conversionService.canConvert(String.class, actualPropertyType)
-						? TypeDescriptor.valueOf(String.class) : TypeDescriptor.valueOf(HashMap.class);
+						? TypeDescriptor.valueOf(String.class)
+						: TypeDescriptor.valueOf(HashMap.class);
 
 				return path.isCollection() ? TypeDescriptor.collection(emptyValue.getClass(), valueDescriptor)
 						: TypeDescriptor.map(emptyValue.getClass(), TypeDescriptor.valueOf(String.class), valueDescriptor);