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


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  * @author Andrei Kouznetsov
39  * @see HTTPBuffer
40  * <br>
41  * Date: 12.11.2003
42  * Time: 12:45:21
43  */
44 public class MutableRAFBufferManager extends RAFBufferManager implements MutableBufferManager {
45
46     public MutableRAFBufferManager(RandomAccessFile JavaDoc raf) throws IOException JavaDoc {
47         this(raf, 0);
48     }
49
50     public MutableRAFBufferManager(RandomAccessFile JavaDoc raf, long offset) throws IOException JavaDoc {
51         this(raf, offset, raf.length());
52     }
53
54     /**
55      * create MutableBuffer over RandomAccessRO (with standard Buffer length of 50k)
56      *
57      * @see RABufferRO
58      */
59     public MutableRAFBufferManager(RandomAccessFile JavaDoc raf, long offset, long length) {
60         this(raf, offset, length, defaultBufferSize);
61     }
62
63     /**
64      * create MutableBuffer over RandomAccessRO
65      *
66      * @param bufferLength standard length of one data block of Buffer
67      *
68      * @see RABufferRO
69      */
70     public MutableRAFBufferManager(RandomAccessFile JavaDoc raf, long offset, long length, int bufferLength) {
71         super(raf, offset, length, bufferLength);
72
73         Buffer buffer = createBuffer(raf, offset, bufferLength);
74         accessManager.put(new Integer JavaDoc(0), buffer);
75     }
76
77     protected Buffer createBuffer(RandomAccessFile JavaDoc ro, long offset, int bufferLength) {
78         return new RAFBuffer(ro, offset, bufferLength);
79     }
80
81     public void clear() {
82         try {
83             flush();
84         }
85         catch (IOException JavaDoc ex) {
86             ex.printStackTrace();
87         }
88         super.clear();
89     }
90 }
91
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