Add RequestBodyAdviceAdapter

Issue: SPR-12501

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestBodyAdvice.java

@@ -16,6 +16,7 @@
 
 package org.springframework.web.servlet.mvc.method.annotation;
 
+import java.io.IOException;
 import java.lang.reflect.Type;
 
 import org.springframework.core.MethodParameter;
@@ -73,7 +74,7 @@ public interface RequestBodyAdvice {
 	 * @return the input request or a new instance, never {@code null}
 	 */
 	HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter,
-			Type targetType, Class<? extends HttpMessageConverter<?>> converterType);
+			Type targetType, Class<? extends HttpMessageConverter<?>> converterType) throws IOException;
 
 	/**
 	 * Invoked third (and last) after the request body is converted to an Object.

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestBodyAdviceAdapter.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2002-2015 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.web.servlet.mvc.method.annotation;
+
+import java.io.IOException;
+import java.lang.reflect.Type;
+
+import org.springframework.core.MethodParameter;
+import org.springframework.http.HttpInputMessage;
+import org.springframework.http.converter.HttpMessageConverter;
+
+/**
+ * A convenient starting point for implementing
+ * {@link org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice
+ * ResponseBodyAdvice} with default method implementations.
+ *
+ * <p>Sub-classes are required to implement {@link #supports} to return true
+ * depending on when the advice applies.
+ *
+ * @author Rossen Stoyanchev
+ * @since 4.2
+ */
+public abstract class RequestBodyAdviceAdapter implements RequestBodyAdvice {
+
+	/**
+	 * The default implementation returns the body that was passed in.
+	 */
+	@Override
+	public Object handleEmptyBody(Object body, HttpInputMessage inputMessage,
+			MethodParameter parameter, Type targetType,
+			Class<? extends HttpMessageConverter<?>> converterType) {
+
+		return body;
+	}
+
+	/**
+	 * The default implementation returns the InputMessage that was passed in.
+	 */
+	@Override
+	public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter,
+			Type targetType, Class<? extends HttpMessageConverter<?>> converterType)
+			throws IOException {
+
+		return inputMessage;
+	}
+
+	/**
+	 * The default implementation returns the body that was passed in.
+	 */
+	@Override
+	public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter,
+			Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
+
+		return body;
+	}
+
+}