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Java > Open Source Codes > org > apache > tapestry > multipart > MultipartDecoderFilter


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.multipart;
16
17 import java.io.IOException JavaDoc;
18
19 import javax.servlet.ServletException JavaDoc;
20 import javax.servlet.http.HttpServletRequest JavaDoc;
21 import javax.servlet.http.HttpServletResponse JavaDoc;
22
23 import org.apache.tapestry.services.ServletRequestServicer;
24 import org.apache.tapestry.services.ServletRequestServicerFilter;
25
26 /**
27  * Checks to see if the request is a file upload and, if so, uses the
28  * {@link org.apache.tapestry.multipart.MultipartDecoder} to obtain form parameters.
29  *
30  * @author Howard M. Lewis Ship
31  * @since 4.0
32  */
33 public class MultipartDecoderFilter implements ServletRequestServicerFilter
34 {
35     private MultipartDecoder _decoder;
36
37     public void service(HttpServletRequest JavaDoc request, HttpServletResponse JavaDoc response,
38             ServletRequestServicer servicer) throws IOException JavaDoc, ServletException JavaDoc
39     {
40         String JavaDoc contentType = request.getContentType();
41
42         // contentType is occasionally null in testing. The browser tacks on additional
43 // information onto the contentType to indicate where the boundaries are in
44 // the stream.
45
46         boolean encoded = contentType != null && contentType.startsWith("multipart/form-data");
47
48         try
49         {
50             HttpServletRequest JavaDoc newRequest = encoded ? _decoder.decode(request) : request;
51
52             servicer.service(newRequest, response);
53         }
54         finally
55         {
56             if (encoded)
57                 _decoder.cleanup();
58         }
59     }
60
61     public void setDecoder(MultipartDecoder decoder)
62     {
63         _decoder = decoder;
64     }
65 }
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