1   /**
2    * Copyright (c) 2000-2008 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.upload;
24  
25  import com.liferay.portal.kernel.util.ByteArrayMaker;
26  import com.liferay.portal.kernel.util.GetterUtil;
27  import com.liferay.portal.util.PropsUtil;
28  import com.liferay.util.servlet.ByteArrayInputStreamWrapper;
29  import com.liferay.util.servlet.ServletInputStreamWrapper;
30  
31  import java.io.ByteArrayInputStream;
32  import java.io.IOException;
33  
34  import javax.servlet.ServletInputStream;
35  import javax.servlet.http.HttpServletRequest;
36  import javax.servlet.http.HttpSession;
37  
38  import org.apache.commons.logging.Log;
39  import org.apache.commons.logging.LogFactory;
40  
41  /**
42   * <a href="LiferayInputStream.java.html"><b><i>View Source</i></b></a>
43   *
44   * @author Brian Myunghun Kim
45   * @author Brian Wing Shun Chan
46   * @author Harry Mark
47   *
48   */
49  public class LiferayInputStream extends ServletInputStreamWrapper {
50  
51      public static final int THRESHOLD_SIZE = GetterUtil.getInteger(
52          PropsUtil.get(LiferayInputStream.class.getName() + ".threshold.size"));
53  
54      public LiferayInputStream(HttpServletRequest request) throws IOException {
55          super(request.getInputStream());
56  
57          _session = request.getSession();
58          _totalSize = request.getContentLength();
59      }
60  
61      public int read(byte[] b, int off, int len) throws IOException {
62          int bytesRead = super.read(b, off, len);
63  
64          if (bytesRead > 0) {
65              _totalRead += bytesRead;
66          }
67          else {
68              return bytesRead;
69          }
70  
71          int percent = (_totalRead * 100) / _totalSize;
72  
73          if (_log.isDebugEnabled()) {
74              _log.debug(bytesRead + "/" + _totalRead + "=" + percent);
75          }
76  
77          if (_totalSize < THRESHOLD_SIZE) {
78              _cachedBytes.write(b, off, bytesRead);
79          }
80  
81          Integer curPercent = (Integer)_session.getAttribute(
82              LiferayFileUpload.PERCENT);
83  
84          if ((curPercent == null) || (percent - curPercent.intValue() >= 1)) {
85              _session.setAttribute(
86                  LiferayFileUpload.PERCENT, new Integer(percent));
87          }
88  
89          return bytesRead;
90      }
91  
92      public ServletInputStream getCachedInputStream() {
93          if (_totalSize < THRESHOLD_SIZE) {
94              return this;
95          }
96          else {
97              return new ByteArrayInputStreamWrapper(
98                  new ByteArrayInputStream(_cachedBytes.toByteArray()));
99          }
100     }
101 
102     private static Log _log = LogFactory.getLog(LiferayInputStream.class);
103 
104     private HttpSession _session;
105     private int _totalRead;
106     private int _totalSize;
107     private ByteArrayMaker _cachedBytes = new ByteArrayMaker();
108 
109 }