SPR-6420, conversation scope

org.springframework.web/src/main/java/org/springframework/web/conversation/WebAwareConversationScope.java

+/*
+ * Copyright 2002-2008 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.conversation;
+
+import org.springframework.conversation.scope.DefaultConversationScope;
+import org.springframework.web.context.request.RequestAttributes;
+import org.springframework.web.context.request.RequestContextHolder;
+
+/**
+ * The extension of the default conversation scope (
+ * {@link DefaultConversationScope}) by supporting contextual web objects
+ * returned by overwriting {@link #resolveContextualObject(String)}.
+ * 
+ * @author Micha Kiener
+ * @since 3.1
+ */
+public class WebAwareConversationScope extends DefaultConversationScope {
+
+	/**
+	 * @see org.springframework.conversation.scope.DefaultConversationScope#resolveContextualObject(java.lang.String)
+	 */
+	@Override
+	public Object resolveContextualObject(String key) {
+		// invoke super to support the conversation context objects
+		Object object = super.resolveContextualObject(key);
+		if (object != null) {
+			return object;
+		}
+
+		// support web context objects
+		RequestAttributes attributes = RequestContextHolder
+				.currentRequestAttributes();
+		return attributes.resolveReference(key);
+	}
+}