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comparison src/org/tmatesoft/hg/internal/DataAccess.java @ 74:6f1b88693d48

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Complete refactoring to org.tmatesoft
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 24 Jan 2011 03:14:45 +0100
parents src/com/tmate/hgkit/fs/DataAccess.java@382cfe9463db
children a3a2e5deb320
comparison
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73:0d279bcc4442 74:6f1b88693d48
1 /*
2 * Copyright (c) 2010 TMate Software Ltd
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * This program 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
11 * GNU General Public License for more details.
12 *
13 * For information on how to redistribute this software under
14 * the terms of a license other than GNU General Public License
15 * contact TMate Software at support@svnkit.com
16 */
17 package org.tmatesoft.hg.internal;
18
19 import java.io.IOException;
20
21 /**
22 * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data.
23 * convenient skip (+/- bytes)
24 * Primary goal - effective file read, so that clients don't need to care whether to call few
25 * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize.
26 *
27 * @author Artem Tikhomirov
28 * @author TMate Software Ltd.
29 */
30 public class DataAccess {
31 public boolean isEmpty() {
32 return true;
33 }
34 // absolute positioning
35 public void seek(long offset) throws IOException {
36 throw new UnsupportedOperationException();
37 }
38 // relative positioning
39 public void skip(int bytes) throws IOException {
40 throw new UnsupportedOperationException();
41 }
42 // shall be called once this object no longer needed
43 public void done() {
44 // no-op in this empty implementation
45 }
46 public int readInt() throws IOException {
47 byte[] b = new byte[4];
48 readBytes(b, 0, 4);
49 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
50 }
51 public long readLong() throws IOException {
52 byte[] b = new byte[8];
53 readBytes(b, 0, 8);
54 int i1 = b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
55 int i2 = b[4] << 24 | (b[5] & 0xFF) << 16 | (b[6] & 0xFF) << 8 | (b[7] & 0xFF);
56 return ((long) i1) << 32 | ((long) i2 & 0xFFFFFFFF);
57 }
58 public void readBytes(byte[] buf, int offset, int length) throws IOException {
59 throw new UnsupportedOperationException();
60 }
61 public byte readByte() throws IOException {
62 throw new UnsupportedOperationException();
63 }
64 }