1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.servlet.filters.gzip;
24  
25  import com.liferay.portal.kernel.util.StringPool;
26  
27  import java.io.IOException;
28  import java.io.OutputStreamWriter;
29  import java.io.PrintWriter;
30  
31  import javax.servlet.ServletOutputStream;
32  import javax.servlet.http.HttpServletResponse;
33  import javax.servlet.http.HttpServletResponseWrapper;
34  
35  /**
36   * <a href="GZipResponse.java.html"><b><i>View Source</i></b></a>
37   *
38   * @author Jayson Falkner
39   * @author Brian Wing Shun Chan
40   *
41   */
42  public class GZipResponse extends HttpServletResponseWrapper {
43  
44      public GZipResponse(HttpServletResponse response) {
45          super(response);
46  
47          _response = response;
48      }
49  
50      public void finishResponse() {
51          try {
52              if (_writer != null) {
53                  _writer.close();
54              }
55              else if (_stream != null) {
56                  _stream.close();
57              }
58          }
59          catch (IOException e) {
60          }
61      }
62  
63      public void flushBuffer() throws IOException {
64          if (_stream != null) {
65              _stream.flush();
66          }
67      }
68  
69      public ServletOutputStream getOutputStream() throws IOException {
70          if (_writer != null) {
71              throw new IllegalStateException();
72          }
73  
74          if (_stream == null) {
75              _stream = _createOutputStream();
76          }
77  
78          return _stream;
79      }
80  
81      public PrintWriter getWriter() throws IOException {
82          if (_writer != null) {
83              return _writer;
84          }
85  
86          if (_stream != null) {
87              throw new IllegalStateException();
88          }
89  
90          _stream = _createOutputStream();
91  
92          _writer = new PrintWriter(new OutputStreamWriter(
93              //_stream, _res.getCharacterEncoding()));
94              _stream, StringPool.UTF8));
95  
96          return _writer;
97      }
98  
99      private ServletOutputStream _createOutputStream() throws IOException {
100         return new GZipStream(_response);
101     }
102 
103     private HttpServletResponse _response = null;
104     private ServletOutputStream _stream = null;
105     private PrintWriter _writer = null;
106 
107 }