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Java > Open Source Codes > org > springframework > web > context > request > RequestScope


1 /*
2  * Copyright 2002-2007 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.springframework.web.context.request;
18
19 /**
20  * Request-backed {@link org.springframework.beans.factory.config.Scope}
21  * implementation.
22  *
23  * <p>Relies on a thread-bound {@link RequestAttributes} instance, which
24  * can be exported through {@link RequestContextListener},
25  * {@link org.springframework.web.filter.RequestContextFilter} or
26  * {@link org.springframework.web.servlet.DispatcherServlet}.
27  *
28  * <p>This <code>Scope</code> will also work for Portlet environments,
29  * through an alternate <code>RequestAttributes</code> implementation
30  * (as exposed out-of-the-box by Spring's
31  * {@link org.springframework.web.portlet.DispatcherPortlet}.
32  *
33  * @author Rod Johnson
34  * @author Juergen Hoeller
35  * @author Rob Harrop
36  * @since 2.0
37  * @see RequestContextHolder#currentRequestAttributes()
38  * @see RequestAttributes#SCOPE_REQUEST
39  * @see RequestContextListener
40  * @see org.springframework.web.filter.RequestContextFilter
41  * @see org.springframework.web.servlet.DispatcherServlet
42  * @see org.springframework.web.portlet.DispatcherPortlet
43  */
44 public class RequestScope extends AbstractRequestAttributesScope {
45
46     protected int getScope() {
47         return RequestAttributes.SCOPE_REQUEST;
48     }
49
50     /**
51      * There is no conversation id concept for a request, so this method
52      * returns <code>null</code>.
53      */
54     public String JavaDoc getConversationId() {
55         return null;
56     }
57
58 }
59
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