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Java > Open Source Codes > org > apache > derby > impl > store > raw > log > LogAccessFileBuffer


1 /*
2
3    Derby - Class org.apache.derby.impl.store.raw.log.LogAccessFileBuffer
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22 package org.apache.derby.impl.store.raw.log;
23
24
25 /**
26
27 A single buffer of data.
28
29 **/
30
31 final class LogAccessFileBuffer
32 {
33
34
35     /**************************************************************************
36      * Fields of the class
37      **************************************************************************
38      */
39     protected byte[] buffer;
40     protected int bytes_free;
41     protected int position;
42     protected int length;
43
44     LogAccessFileBuffer next;
45     LogAccessFileBuffer prev;
46
47     /**************************************************************************
48      * Constructors for This class:
49      **************************************************************************
50      */
51     public LogAccessFileBuffer(
52     int size)
53     {
54         buffer = new byte[size];
55         prev = null;
56         next = null;
57
58         init(0);
59     }
60
61     /**************************************************************************
62      * Private/Protected methods of This class:
63      **************************************************************************
64      */
65     public void init(int reserve)
66     {
67         length = buffer.length - reserve;
68         bytes_free = length;
69         position = reserve;
70     }
71
72     /**************************************************************************
73      * Public Methods of This class:
74      **************************************************************************
75      */
76
77     /**************************************************************************
78      * Public Methods of XXXX class:
79      **************************************************************************
80      */
81 }
82
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