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Java > Open Source Codes > com > imagero > uio > buffer > RAFBuffer


1 /*
2  * Copyright (c) Andrey Kuznetsov. All Rights Reserved.
3  *
4  * http://uio.imagero.com
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * o Redistributions of source code must retain the above copyright notice,
10  * this list of conditions and the following disclaimer.
11  *
12  * o Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  *
16  * o Neither the name of imagero Andrei Kouznetsov nor the names of
17  * its contributors may be used to endorse or promote products derived
18  * from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
29  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package com.imagero.uio.buffer;
33
34 import java.io.IOException JavaDoc;
35 import java.io.RandomAccessFile JavaDoc;
36
37 /**
38  * Implementation of Buffer for RandomAccessFile.
39  *
40  * @author Andrei Kouznetsov
41  * Date: 05.01.2004
42  * Time: 20:59:01
43  */
44 public class RAFBuffer extends RAFBufferRO implements MutableBuffer {
45
46     RandomAccessFile JavaDoc ra;
47     private boolean dirty;
48
49
50     public RAFBuffer(RandomAccessFile JavaDoc ra, long offset, int length) {
51         super(ra, offset, length);
52         this.ra = ra;
53     }
54
55     public void flush() throws IOException JavaDoc {
56         if(dirty) {
57             try {
58                 writeData();
59             }
60             finally {
61                 dirty = false;
62             }
63         }
64     }
65
66     protected void writeData() throws IOException JavaDoc {
67         if(data == null) {
68             return;
69         }
70         long currentOffset = raf.getFilePointer();
71         ra.seek(offset);
72         ra.write(data);
73         ra.seek(currentOffset);
74     }
75
76     public boolean isDirty() {
77         return dirty;
78     }
79
80     public void setDirty() {
81         this.dirty = true;
82     }
83 }
84
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