1 /*
2 * $Id$
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.struts.chain.commands;
22
23 import java.util.Map;
24
25 import org.apache.struts.Globals;
26 import org.apache.struts.action.ActionMessages;
27 import org.apache.struts.chain.contexts.ActionContext;
28
29 /**
30 * <p>Remove cached messages stored in the session.</p>
31 *
32 * @version $Id$
33 * @see CacheMessages
34 * @since Struts 1.3.5
35 */
36 public class RemoveCachedMessages extends ActionCommandBase {
37
38 /**
39 * <p>Removes any <code>ActionMessages</code> object stored in the session
40 * under <code>Globals.MESSAGE_KEY</code> and <code>Globals.ERROR_KEY</code>
41 * if the messages' <code>isAccessed</code> method returns true. This
42 * allows messages to be stored in the session, displayed one time, and be
43 * released here.</p>
44 *
45 * @param actionCtx The <code>Context</code> for the current request
46 * @return <code>false</code> so that processing continues
47 * @throws Exception on any error
48 */
49 @Override
50 protected boolean execute_(ActionContext actionCtx)
51 throws Exception {
52
53 // Get session scope
54 Map<String, Object> session = actionCtx.getSessionScope();
55
56 // Remove messages as needed
57 removeAccessedMessages(session, Globals.MESSAGE_KEY);
58
59 // Remove error messages as needed
60 removeAccessedMessages(session, Globals.ERROR_KEY);
61
62 return CONTINUE_PROCESSING;
63 }
64
65 /**
66 * <p>Removes any <code>ActionMessages</code> object from the specified
67 * scope stored under the specified key if the messages'
68 * <code>isAccessed</code> method returns true.
69 *
70 * @param scope The scope to check for messages in.
71 * @param key The key the messages are stored under.
72 */
73 private void removeAccessedMessages(Map<String, Object> scope, String key) {
74 ActionMessages messages = (ActionMessages)scope.get(key);
75 if (messages != null && messages.isAccessed()) {
76 scope.remove(key);
77 }
78 }
79 }