01: /*
02: * $Id: FileOffsetLobSource.java,v 1.4 2005/04/13 00:42:58 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2002-2005 Axion Development Team. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * 1. Redistributions of source code must retain the above
11: * copyright notice, this list of conditions and the following
12: * disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The names "Tigris", "Axion", nor the names of its contributors may
20: * not be used to endorse or promote products derived from this
21: * software without specific prior written permission.
22: *
23: * 4. Products derived from this software may not be called "Axion", nor
24: * may "Tigris" or "Axion" appear in their names without specific prior
25: * written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38: * =======================================================================
39: */
40:
41: package org.axiondb.types;
42:
43: import java.io.ByteArrayInputStream;
44: import java.io.IOException;
45: import java.io.InputStream;
46: import java.io.OutputStream;
47:
48: import org.axiondb.AxionException;
49: import org.axiondb.io.BufferedDataInputStream;
50:
51: /**
52: * A {@link LobSource} that's backed by a single file, storing
53: * each LOB as an offset and length.
54: *
55: * @version $Revision: 1.4 $ $Date: 2005/04/13 00:42:58 $
56: * @author Rodney Waldhoff
57: */
58: public class FileOffsetLobSource implements LobSource {
59:
60: public FileOffsetLobSource(BufferedDataInputStream in, long offset,
61: int length) {
62: _in = in;
63: _offset = offset;
64: _length = length;
65: }
66:
67: public long length() throws AxionException {
68: return _length;
69: }
70:
71: public void truncate(long length) throws AxionException {
72: throw new AxionException("Can't truncate FileOffsetLobs");
73: }
74:
75: public InputStream getInputStream() throws AxionException {
76: if (null == _data) {
77: _data = new byte[_length];
78: try {
79: synchronized (_in) {
80: _in.seek(_offset);
81: _in.read(_data);
82: }
83: } catch (IOException e) {
84: throw new AxionException(e);
85: }
86: }
87: return new ByteArrayInputStream(_data);
88: }
89:
90: public OutputStream setOutputStream(long pos) throws AxionException {
91: throw new AxionException(
92: "Can't setOutputStream in FileOffsetLobs");
93: }
94:
95: private BufferedDataInputStream _in = null;
96: private long _offset = -1L;
97: private int _length = -1;
98: private byte[] _data = null;
99: }
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