1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.kernel.io.unsync;
16  
17  import java.io.IOException;
18  import java.io.OutputStream;
19  import java.io.UnsupportedEncodingException;
20  
21  /**
22   * <a href="UnsyncByteArrayOutputStream.java.html"><b><i>View Source</i></b></a>
23   *
24   * <p>
25   * See http://issues.liferay.com/browse/LPS-6648.
26   * </p>
27   *
28   * @author Shuyang Zhou
29   */
30  public class UnsyncByteArrayOutputStream extends OutputStream {
31  
32      public UnsyncByteArrayOutputStream() {
33          this(32);
34      }
35  
36      public UnsyncByteArrayOutputStream(int size) {
37          buffer = new byte[size];
38      }
39  
40      public void reset() {
41          index = 0;
42      }
43  
44      public int size() {
45          return index;
46      }
47  
48      public byte[] toByteArray() {
49          byte[] newBuffer = new byte[index];
50  
51          System.arraycopy(buffer, 0, newBuffer, 0, index);
52  
53          return newBuffer;
54      }
55  
56      public String toString() {
57          return new String(buffer, 0, index);
58      }
59  
60      public String toString(String charsetName)
61          throws UnsupportedEncodingException {
62  
63          return new String(buffer, 0, index, charsetName);
64      }
65  
66      public byte[] unsafeGetByteArray() {
67          return buffer;
68      }
69  
70      public void write(byte[] byteArray) {
71          write(byteArray, 0, byteArray.length);
72      }
73  
74      public void write(byte[] byteArray, int offset, int length) {
75          if (length <= 0) {
76              return;
77          }
78  
79          int newIndex = index + length;
80  
81          if (newIndex > buffer.length) {
82              int newBufferSize = Math.max(buffer.length << 1, newIndex);
83  
84              byte[] newBuffer = new byte[newBufferSize];
85  
86              System.arraycopy(buffer, 0, newBuffer, 0, index);
87  
88              buffer = newBuffer;
89          }
90  
91          System.arraycopy(byteArray, offset, buffer, index, length);
92  
93          index = newIndex;
94      }
95  
96      public void write(int b) {
97          int newIndex = index + 1;
98  
99          if (newIndex > buffer.length) {
100             int newBufferSize = Math.max(buffer.length << 1, newIndex);
101 
102             byte[] newBuffer = new byte[newBufferSize];
103 
104             System.arraycopy(buffer, 0, newBuffer, 0, buffer.length);
105 
106             buffer = newBuffer;
107         }
108 
109         buffer[index] = (byte)b;
110 
111         index = newIndex;
112     }
113 
114     public void writeTo(OutputStream outputStream) throws IOException {
115         outputStream.write(buffer, 0, index);
116     }
117 
118     protected byte[] buffer;
119     protected int index;
120 
121 }