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Java > Open Source Codes > org > apache > commons > jxpath > servlet > ServletRequestHandler


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation
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 package org.apache.commons.jxpath.servlet;
17
18 import java.util.Enumeration JavaDoc;
19 import java.util.HashSet JavaDoc;
20
21 import javax.servlet.ServletRequest JavaDoc;
22
23 /**
24  * Implementation of the DynamicPropertyHandler interface that provides
25  * access to attributes and parameters of a ServletRequest.
26  *
27  * @author Dmitri Plotnikov
28  * @version $Revision: 1.6 $ $Date: 2004/05/08 15:10:49 $
29  */
30 public class ServletRequestHandler extends HttpSessionHandler {
31     
32     protected void collectPropertyNames(HashSet JavaDoc set, Object JavaDoc bean) {
33         super.collectPropertyNames(set, bean);
34         ServletRequestAndContext handle = (ServletRequestAndContext) bean;
35         ServletRequest JavaDoc servletRequest = handle.getServletRequest();
36         Enumeration JavaDoc e = servletRequest.getAttributeNames();
37         while (e.hasMoreElements()) {
38             set.add(e.nextElement());
39         }
40         e = servletRequest.getParameterNames();
41         while (e.hasMoreElements()) {
42             set.add(e.nextElement());
43         }
44     }
45     
46     public Object JavaDoc getProperty(Object JavaDoc bean, String JavaDoc property) {
47         ServletRequestAndContext handle = (ServletRequestAndContext) bean;
48         ServletRequest JavaDoc servletRequest = handle.getServletRequest();
49         String JavaDoc[] strings = servletRequest.getParameterValues(property);
50         if (strings != null) {
51             if (strings.length == 0) {
52                 return null;
53             }
54             if (strings.length == 1) {
55                 return strings[0];
56             }
57             return strings;
58         }
59         
60         Object JavaDoc object = servletRequest.getAttribute(property);
61         if (object != null) {
62             return object;
63         }
64         
65         return super.getProperty(bean, property);
66     }
67
68     public void setProperty(Object JavaDoc request, String JavaDoc property, Object JavaDoc value) {
69         ((ServletRequest JavaDoc) request).setAttribute(property, value);
70     }
71 }
72
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