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Java > Open Source Codes > org > fjank > jcache > persistence > DiskElementDescriptor


1 /* Open Source Java Caching Service
2 * Copyright (C) 2002 Frank Karlstrøm
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 * The author can be contacted by email: fjankk@users.sourceforge.net
18 */
19 package org.fjank.jcache.persistence;
20
21 import java.io.Serializable JavaDoc;
22
23
24 /**
25  * Disk objects are located by descriptor entries. These are saved on shutdown
26  * and loaded into memory on startup.
27  */
28 class DiskElementDescriptor implements Serializable JavaDoc {
29     /** the position where the object starts */
30     long pos;
31
32     /** the length of the object */
33     int len;
34
35     /**
36      * Creates a new DiskElementDescriptor object.
37      */
38     DiskElementDescriptor() {
39     }
40
41     /**
42      * initializes this descriptor with the position to start at, and a byte[]
43      * with the actual data which is to be written.
44      *
45      * @param pos2 the starting position
46      * @param data the data to write.
47      */
48     void init(final long pos2, final byte[] data) {
49         this.pos = pos2;
50         this.len = data.length;
51     }
52 }
53
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