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1   /**
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v1.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.access.servlet;
15  
16  import java.io.IOException;
17  import java.io.OutputStreamWriter;
18  import java.io.PrintWriter;
19  
20  import javax.servlet.ServletOutputStream;
21  import javax.servlet.http.HttpServletResponse;
22  import javax.servlet.http.HttpServletResponseWrapper;
23  
24  public class TeeHttpServletResponse extends HttpServletResponseWrapper {
25  
26      TeeServletOutputStream teeServletOutputStream;
27      PrintWriter teeWriter;
28  
29      public TeeHttpServletResponse(HttpServletResponse httpServletResponse) {
30          super(httpServletResponse);
31      }
32  
33      @Override
34      public ServletOutputStream getOutputStream() throws IOException {
35          if (teeServletOutputStream == null) {
36              teeServletOutputStream = new TeeServletOutputStream(this.getResponse());
37          }
38          return teeServletOutputStream;
39      }
40  
41      @Override
42      public PrintWriter getWriter() throws IOException {
43          if (this.teeWriter == null) {
44              this.teeWriter = new PrintWriter(
45                      new OutputStreamWriter(getOutputStream(), this.getResponse().getCharacterEncoding()), true);
46          }
47          return this.teeWriter;
48      }
49  
50      @Override
51      public void flushBuffer() {
52          if (this.teeWriter != null) {
53              this.teeWriter.flush();
54          }
55      }
56  
57      byte[] getOutputBuffer() {
58          // teeServletOutputStream can be null if the getOutputStream method is never
59          // called.
60          if (teeServletOutputStream != null) {
61              return teeServletOutputStream.getOutputStreamAsByteArray();
62          } else {
63              return null;
64          }
65      }
66  
67      void finish() throws IOException {
68          if (this.teeWriter != null) {
69              this.teeWriter.close();
70          }
71          if (this.teeServletOutputStream != null) {
72              this.teeServletOutputStream.close();
73          }
74      }
75  }