Preserve shadowed fields in DirectFieldAccessor

Prior to this change, DirectFieldAccessor would ignore fields shadowed
in subclasses, favoring the last field processed, which happens to be
the most super declaration based on the way ReflectionUtils.doWithFields
works.

Because the locally shadowed field may be of a different type that the
superclass declaration, it is most correct to preserve and work with
the shadowed field.

Issue: SPR-8398

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@4559 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.beans/src/main/java/org/springframework/beans/DirectFieldAccessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -58,12 +58,16 @@ public class DirectFieldAccessor extends AbstractPropertyAccessor {
 	 * Create a new DirectFieldAccessor for the given target object.
 	 * @param target the target object to access
 	 */
-	public DirectFieldAccessor(Object target) {
+	public DirectFieldAccessor(final Object target) {
 		Assert.notNull(target, "Target object must not be null");
 		this.target = target;
 		ReflectionUtils.doWithFields(this.target.getClass(), new ReflectionUtils.FieldCallback() {
 			public void doWith(Field field) {
-				fieldMap.put(field.getName(), field);
+				if (fieldMap.containsKey(field.getName())) {
+					// ignore superclass declarations of fields already found in a subclass
+				} else {
+					fieldMap.put(field.getName(), field);
+				}
 			}
 		});
 		this.typeConverterDelegate = new TypeConverterDelegate(this, target);
@@ -81,7 +85,7 @@ public class DirectFieldAccessor extends AbstractPropertyAccessor {
 	}
 
 	@Override
-	public Class getPropertyType(String propertyName) throws BeansException {
+	public Class<?> getPropertyType(String propertyName) throws BeansException {
 		Field field = this.fieldMap.get(propertyName);
 		if (field != null) {
 			return field.getType();

org.springframework.beans/src/test/java/org/springframework/beans/DirectFieldAccessorTests.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2002-2011 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
+ *
+ * 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.beans;
+
+import static org.junit.Assert.assertEquals;
+
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link DirectFieldAccessor}
+ *
+ * @author Jose Luis Martin
+ * @author Chris Beams
+ */
+public class DirectFieldAccessorTests {
+
+	@Test
+	public void withShadowedField() throws Exception {
+		@SuppressWarnings("serial")
+		JPanel p = new JPanel() {
+			@SuppressWarnings("unused")
+			JTextField name = new JTextField();
+		};
+
+		DirectFieldAccessor dfa = new DirectFieldAccessor(p);
+		assertEquals(JTextField.class, dfa.getPropertyType("name"));
+	}
+}