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Java > Open Source Codes > com > db4o > io > VanillaIoAdapter


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.io;
22
23 import java.io.*;
24
25 /**
26  * base class for IoAdapters that delegate to other IoAdapters (decorator pattern)
27  */
28 public abstract class VanillaIoAdapter extends IoAdapter {
29     
30     protected IoAdapter _delegate;
31     
32     public VanillaIoAdapter(IoAdapter delegateAdapter){
33         _delegate = delegateAdapter;
34     }
35     
36     protected VanillaIoAdapter(IoAdapter delegateAdapter, String JavaDoc path, boolean lockFile, long initialLength) throws IOException {
37         _delegate = delegateAdapter.open(path, lockFile, initialLength);
38     }
39
40     public void close() throws IOException {
41         _delegate.close();
42     }
43
44     public void delete(String JavaDoc path) {
45         _delegate.delete(path);
46     }
47     
48     public boolean exists(String JavaDoc path) {
49         return _delegate.exists(path);
50     }
51     
52     public long getLength() throws IOException {
53         return _delegate.getLength();
54     }
55
56     public int read(byte[] bytes, int length) throws IOException {
57         return _delegate.read(bytes, length);
58     }
59
60     public void seek(long pos) throws IOException {
61         _delegate.seek(pos);
62     }
63
64     public void sync() throws IOException {
65         _delegate.sync();
66     }
67
68     public void write(byte[] buffer, int length) throws IOException {
69         _delegate.write(buffer, length);
70     }
71
72 }
73
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