1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   *
12   *
13   */
14  
15  package com.liferay.portal.upload;
16  
17  import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream;
18  import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStreamWrapper;
19  import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayOutputStream;
20  import com.liferay.portal.kernel.log.Log;
21  import com.liferay.portal.kernel.log.LogFactoryUtil;
22  import com.liferay.portal.kernel.util.GetterUtil;
23  import com.liferay.portal.util.PropsUtil;
24  import com.liferay.util.servlet.ServletInputStreamWrapper;
25  
26  import java.io.IOException;
27  
28  import javax.servlet.ServletInputStream;
29  import javax.servlet.http.HttpServletRequest;
30  import javax.servlet.http.HttpSession;
31  
32  /**
33   * <a href="LiferayInputStream.java.html"><b><i>View Source</i></b></a>
34   *
35   * @author Brian Myunghun Kim
36   * @author Brian Wing Shun Chan
37   * @author Harry Mark
38   */
39  public class LiferayInputStream extends ServletInputStreamWrapper {
40  
41      public static final int THRESHOLD_SIZE = GetterUtil.getInteger(
42          PropsUtil.get(LiferayInputStream.class.getName() + ".threshold.size"));
43  
44      public LiferayInputStream(HttpServletRequest request) throws IOException {
45          super(request.getInputStream());
46  
47          _session = request.getSession();
48          _totalSize = request.getContentLength();
49      }
50  
51      public int read(byte[] b, int off, int len) throws IOException {
52          int bytesRead = super.read(b, off, len);
53  
54          if (bytesRead > 0) {
55              _totalRead += bytesRead;
56          }
57          else {
58              return bytesRead;
59          }
60  
61          int percent = (_totalRead * 100) / _totalSize;
62  
63          if (_log.isDebugEnabled()) {
64              _log.debug(bytesRead + "/" + _totalRead + "=" + percent);
65          }
66  
67          if (_totalSize < THRESHOLD_SIZE) {
68              _cachedBytes.write(b, off, bytesRead);
69          }
70  
71          Integer curPercent = (Integer)_session.getAttribute(
72              LiferayFileUpload.PERCENT);
73  
74          if ((curPercent == null) || (percent - curPercent.intValue() >= 1)) {
75              _session.setAttribute(
76                  LiferayFileUpload.PERCENT, new Integer(percent));
77          }
78  
79          return bytesRead;
80      }
81  
82      public ServletInputStream getCachedInputStream() {
83          if (_totalSize < THRESHOLD_SIZE) {
84              return this;
85          }
86          else {
87              return new UnsyncByteArrayInputStreamWrapper(
88                  new UnsyncByteArrayInputStream(
89                      _cachedBytes.unsafeGetByteArray(), 0, _cachedBytes.size()));
90          }
91      }
92  
93      private static Log _log = LogFactoryUtil.getLog(LiferayInputStream.class);
94  
95      private HttpSession _session;
96      private int _totalRead;
97      private int _totalSize;
98      private UnsyncByteArrayOutputStream _cachedBytes =
99          new UnsyncByteArrayOutputStream();
100 
101 }