1 /*
2 * $Id: BackgroundProcess.java 651946 2008-04-27 13:41:38Z apetrelli $
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.struts2.interceptor;
22
23
24 import java.util.HashMap;
25 import java.util.Iterator;
26 import java.util.Map;
27 import java.util.Set;
28
29 import com.opensymphony.xwork2.ActionInvocation;
30 import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
31
32
33 /**
34 * Just as the CheckboxInterceptor checks that if only the hidden field is present, so too does this interceptor. If
35 * the "__multiselect_" request parameter is present and its visible counterpart is not, set a new request parameter to an
36 * empty Sting.
37 */
38 public class MultiselectInterceptor extends AbstractInterceptor {
39 private static final long serialVersionUID = 1L;
40
41 /**
42 * Just as the CheckboxInterceptor checks that if only the hidden field is present, so too does this interceptor.
43 * If the "__multiselect_" request parameter is present and its visible counterpart is not, set a new request parameter
44 * to an empty Sting.
45 *
46 * @param actionInvocation ActionInvocation
47 * @return the result of the action
48 * @throws Exception if error
49 * @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation)
50 */
51 public String intercept(ActionInvocation actionInvocation) throws Exception {
52 Map parameters = actionInvocation.getInvocationContext().getParameters();
53 Map<String, Object> newParams = new HashMap<String, Object>();
54 Set<String> keys = parameters.keySet();
55
56 for (Iterator<String> iterator = keys.iterator(); iterator.hasNext();) {
57 String key = iterator.next();
58
59 if (key.startsWith("__multiselect_")) {
60 String name = key.substring("__multiselect_".length());
61
62 iterator.remove();
63
64 // is this multi-select box submitted?
65 if (!parameters.containsKey(name)) {
66
67 // if not, let's be sure to default the value to an empty string array
68 newParams.put(name, new String[0]);
69 }
70 }
71 }
72
73 parameters.putAll(newParams);
74
75 return actionInvocation.invoke();
76 }
77 }
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