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Java > Open Source Codes > com > db4o > inside > SystemInfoFileImpl


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

21 package com.db4o.inside;
22
23 import com.db4o.*;
24 import com.db4o.ext.*;
25 import com.db4o.inside.freespace.*;
26
27 /**
28  * @exclude
29  */

30 public class SystemInfoFileImpl implements SystemInfo{
31     
32     private YapFile _file;
33
34     public SystemInfoFileImpl(YapFile file){
35         _file = file;
36     }
37
38     public int freespaceEntryCount() {
39         if(! hasFreespaceManager()){
40             return 0;
41         }
42         return freespaceManager().entryCount();
43     }
44
45     private boolean hasFreespaceManager() {
46         return freespaceManager() != null;
47     }
48  
49
50     private FreespaceManager freespaceManager() {
51         return _file.freespaceManager();
52     }
53
54     public long freespaceSize() {
55         if(! hasFreespaceManager()){
56             return 0;
57         }
58         long blockSize = _file.blockSize();
59         long blockedSize = freespaceManager().freeSize();
60         return blockSize * blockedSize;
61     }
62
63     public long totalSize() {
64         return _file.fileLength();
65     }
66
67
68 }
69
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