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Java > Open Source Codes > sync4j > framework > notification > BitOutputStream


1 /**
2  * Copyright (C) 2003-2005 Funambol
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  */
18
19 package sync4j.framework.notification;
20
21 import java.io.*;
22
23
24 /**
25  * @author Stefano Nichele @ Funambol
26  *
27  * @version $Id: BitOutputStream.java,v 1.1 2005/05/16 17:32:55 nichele Exp $
28  */
29 public class BitOutputStream {
30
31     // ------------------------------------------------------------ Private data
32 private OutputStream out;
33     private int buffer;
34     private int bitCount = 7;
35
36     // ------------------------------------------------------------- Constructor
37 public BitOutputStream(OutputStream out) {
38         this.out = out;
39     }
40
41     // ----------------------------------------------------------- Public method
42 synchronized public void writeBit(int bit) throws IOException {
43         if (out == null)
44             throw new IOException("Already closed");
45
46         if (bit != 0 && bit != 1) {
47             throw new IOException(bit + " is not a bit");
48         }
49
50
51         buffer |= bit << bitCount;
52
53         bitCount--;
54
55         if (bitCount == -1) {
56             flush();
57         }
58
59
60     }
61
62     private void flush() throws IOException {
63         if (bitCount < 7) {
64             out.write( (byte)buffer);
65             bitCount = 7;
66             buffer = 0;
67         }
68     }
69
70     public void close() throws IOException {
71         flush();
72         out.close();
73         out = null;
74     }
75 }
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