DecodedRequestInjector


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.request;
16  
17  import java.io.IOException  ;
18  
19  import javax.servlet.ServletException  ;
20  import javax.servlet.http.HttpServletRequest  ;
21  import javax.servlet.http.HttpServletResponse  ;
22  
23  import org.apache.tapestry.Tapestry;
24  import org.apache.tapestry.services.ServletRequestServicer;
25  import org.apache.tapestry.services.ServletRequestServicerFilter;
26  import org.apache.tapestry.spec.ILibrarySpecification;
27  
28  /**
29   * Checks to see if a {@link org.apache.tapestry.request.IRequestDecoder}has been provided as an
30   * application extension, and (if so), creates a new HttpServletRequest wrapper around the decoded
31   * request.
32   * 
33   * @author Howard M. Lewis Ship
34   * @since 4.0
35   */
36  public class DecodedRequestInjector implements ServletRequestServicerFilter
37  {
38      private ILibrarySpecification _applicationSpecification;
39  
40      private IRequestDecoder _decoder;
41  
42      public void initializeService()
43      {
44          if (_applicationSpecification.checkExtension(Tapestry.REQUEST_DECODER_EXTENSION_NAME))
45              _decoder = (IRequestDecoder) _applicationSpecification.getExtension(
46                      Tapestry.REQUEST_DECODER_EXTENSION_NAME,
47                      IRequestDecoder.class);
48      }
49  
50      public void service(HttpServletRequest   request, HttpServletResponse   response,
51              ServletRequestServicer servicer) throws IOException  , ServletException  
52      {
53          HttpServletRequest   decodedRequest = _decoder == null ? request : wrapRequest(request);
54  
55          servicer.service(decodedRequest, response);
56      }
57  
58      public HttpServletRequest   wrapRequest(HttpServletRequest   request)
59      {
60          DecodedRequest decodedRequest = _decoder.decodeRequest(request);
61  
62          return new DecodedRequestWrapper(request, decodedRequest);
63      }
64  
65      public void setApplicationSpecification(ILibrarySpecification applicationSpecification)
66      {
67          _applicationSpecification = applicationSpecification;
68      }
69  
70  }
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