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.kernel.io.unsync;
16  
17  import java.io.IOException;
18  import java.io.Reader;
19  
20  import java.nio.CharBuffer;
21  
22  /**
23   * <a href="UnsyncCharArrayReader.java.html"><b><i>View Source</i></b></a>
24   *
25   * @author Shuyang Zhou
26   */
27  public class UnsyncCharArrayReader extends Reader {
28  
29      public UnsyncCharArrayReader(char[] charArray) {
30          buffer = charArray;
31          capacity = charArray.length;
32          index = 0;
33      }
34  
35      public UnsyncCharArrayReader(char[] charArray, int offset, int length) {
36          buffer = charArray;
37          capacity = Math.min(charArray.length, offset + length);
38          index = offset;
39          markIndex = offset;
40      }
41  
42      public void close() {
43          buffer = null;
44      }
45  
46      public void mark(int readAheadLimit) throws IOException {
47          if (buffer == null) {
48              throw new IOException("Stream closed");
49          }
50          markIndex = index;
51      }
52  
53      public boolean markSupported() {
54          return true;
55      }
56  
57      public int read() throws IOException {
58          if (buffer == null) {
59              throw new IOException("Stream closed");
60          }
61  
62          if (index >= capacity) {
63              return -1;
64          }
65          else {
66              return buffer[index++];
67          }
68      }
69  
70      public int read(char[] charArray) throws IOException {
71          return read(charArray, 0, charArray.length);
72      }
73  
74      public int read(char[] charArray, int offset, int length)
75          throws IOException {
76  
77          if (buffer == null) {
78              throw new IOException("Stream closed");
79          }
80  
81          if (length <= 0) {
82              return 0;
83          }
84  
85          if (index >= capacity) {
86              return -1;
87          }
88  
89          int read = length;
90  
91          if ((index + read) > capacity) {
92              read = capacity - index;
93          }
94  
95          System.arraycopy(buffer, index, charArray, offset, read);
96  
97          index += read;
98  
99          return read;
100     }
101 
102     public int read(CharBuffer charBuffer) throws IOException {
103         if (buffer == null) {
104             throw new IOException("Stream closed");
105         }
106 
107         int length = charBuffer.remaining();
108 
109         if (length <= 0) {
110             return 0;
111         }
112 
113         if (index >= capacity) {
114             return -1;
115         }
116 
117         if ((index + length) > capacity) {
118             length = capacity - index;
119         }
120 
121         charBuffer.put(buffer, index, length);
122 
123         index += length;
124 
125         return length;
126     }
127 
128     public boolean ready() throws IOException {
129         if (buffer == null) {
130             throw new IOException("Stream closed");
131         }
132 
133         if (capacity > index) {
134             return true;
135         }
136         else {
137             return false;
138         }
139     }
140 
141     public void reset() throws IOException {
142         if (buffer == null) {
143             throw new IOException("Stream closed");
144         }
145 
146         index = markIndex;
147     }
148 
149     public long skip(long skip) throws IOException {
150         if (buffer == null) {
151             throw new IOException("Stream closed");
152         }
153 
154         if (skip < 0) {
155             return 0;
156         }
157 
158         if (index + skip > capacity) {
159             skip = capacity - index;
160         }
161 
162         index += skip;
163 
164         return skip;
165     }
166 
167     protected char[] buffer;
168     protected int capacity;
169     protected int index;
170     protected int markIndex;
171 
172 }