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Java > Open Source Codes > org > archive > util > ms > HeaderBlock


1 /* HeaderBlock
2 *
3 * Created on September 12, 2006
4 *
5 * Copyright (C) 2006 Internet Archive.
6 *
7 * This file is part of the Heritrix web crawler (crawler.archive.org).
8 *
9 * Heritrix is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * any later version.
13 *
14 * Heritrix is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser Public License
20 * along with Heritrix; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23 package org.archive.util.ms;
24
25
26 import java.nio.ByteBuffer JavaDoc;
27 import java.nio.ByteOrder JavaDoc;
28
29
30 class HeaderBlock {
31
32     
33     private ByteBuffer JavaDoc buffer;
34     
35     
36     public HeaderBlock(ByteBuffer JavaDoc buffer) {
37         // FIXME: Read the fields we're interested in directly from stream
38 this.buffer = buffer;
39         buffer.order(ByteOrder.LITTLE_ENDIAN);
40     }
41     
42     
43     public long getFileType() {
44         return buffer.getLong(0);
45     }
46     
47     
48     public int getBATCount() {
49         return buffer.getInt(0x2C);
50     }
51     
52     
53     public int getEntriesStart() {
54         return buffer.getInt(0x30);
55     }
56     
57     
58     public int getSmallBATStart() {
59         return buffer.getInt(0x3C);
60     }
61     
62     
63     public int getSmallBATCount() {
64         return buffer.getInt(0x40);
65     }
66     
67     
68     public int getExtendedBATStart() {
69         return buffer.getInt(0x44);
70     }
71     
72     
73     public int getExtendedBATCount() {
74         return buffer.getInt(0x48);
75     }
76     
77     
78     public int getBATBlockNumber(int block) {
79         assert block < 110;
80         return buffer.getInt(0x4C + block * 4);
81     }
82
83     
84     public String JavaDoc toString() {
85         StringBuilder JavaDoc sb = new StringBuilder JavaDoc("HeaderBlock{");
86         sb.append("fileType=" + getFileType());
87         sb.append(" propertiesStart=" + getEntriesStart());
88         sb.append(" batCount=" + getBATCount());
89         sb.append(" extendedBATStart=" + getExtendedBATStart());
90         sb.append(" extendedBATCount=" + getExtendedBATCount());
91         sb.append(" smallBATStart=" + getSmallBATStart());
92         sb.append(" smallBATCount=" + getSmallBATCount());
93         sb.append("}");
94         return sb.toString();
95     }
96
97 }
98
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