annotate src/org/tmatesoft/hg/internal/DataAccess.java @ 158:b413b16d10a5

Integer offsets and file length explictly, rather than casts throughout code. Inflater may benefit from total length hint, but shall calculate it by its own if needed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 09 Mar 2011 13:16:37 +0100
parents d5268ca7715b
children 5e95b0da26f2
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.IOException;
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20 import java.nio.ByteBuffer;
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22 /**
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23 * relevant parts of DataInput, non-stream nature (seek operation), explicit check for end of data.
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24 * convenient skip (+/- bytes)
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25 * Primary goal - effective file read, so that clients don't need to care whether to call few
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26 * distinct getInt() or readBytes(totalForFewInts) and parse themselves instead in an attempt to optimize.
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class DataAccess {
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32 public boolean isEmpty() {
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33 return true;
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34 }
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35 public int length() {
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36 return 0;
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37 }
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38 /**
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39 * get this instance into initial state
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40 * @throws IOException
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41 * @return <code>this</code> for convenience
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42 */
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43 public DataAccess reset() throws IOException {
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44 // nop, empty instance is always in the initial state
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45 return this;
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46 }
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47 // absolute positioning
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48 public void seek(int offset) throws IOException {
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49 throw new UnsupportedOperationException();
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50 }
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51 // relative positioning
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52 public void skip(int bytes) throws IOException {
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53 throw new UnsupportedOperationException();
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54 }
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55 // shall be called once this object no longer needed
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56 public void done() {
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57 // no-op in this empty implementation
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58 }
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59 public int readInt() throws IOException {
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60 byte[] b = new byte[4];
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61 readBytes(b, 0, 4);
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62 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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63 }
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64 public long readLong() throws IOException {
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65 byte[] b = new byte[8];
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66 readBytes(b, 0, 8);
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67 int i1 = b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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68 int i2 = b[4] << 24 | (b[5] & 0xFF) << 16 | (b[6] & 0xFF) << 8 | (b[7] & 0xFF);
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69 return ((long) i1) << 32 | ((long) i2 & 0xFFFFFFFFl);
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70 }
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71 public void readBytes(byte[] buf, int offset, int length) throws IOException {
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72 throw new UnsupportedOperationException();
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73 }
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74 // reads bytes into ByteBuffer, up to its limit or total data length, whichever smaller
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75 // FIXME perhaps, in DataAccess paradigm (when we read known number of bytes, we shall pass specific byte count to read)
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76 public void readBytes(ByteBuffer buf) throws IOException {
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77 // int toRead = Math.min(buf.remaining(), (int) length());
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78 // if (buf.hasArray()) {
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79 // readBytes(buf.array(), buf.arrayOffset(), toRead);
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80 // } else {
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81 // byte[] bb = new byte[toRead];
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82 // readBytes(bb, 0, bb.length);
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83 // buf.put(bb);
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84 // }
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85 // FIXME optimize to read as much as possible at once
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86 while (!isEmpty() && buf.hasRemaining()) {
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87 buf.put(readByte());
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88 }
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89 }
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90 public byte readByte() throws IOException {
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91 throw new UnsupportedOperationException();
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92 }
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94 // XXX decide whether may or may not change position in the DataAccess
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95 // FIXME exception handling is not right, just for the sake of quick test
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96 public byte[] byteArray() throws IOException {
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97 reset();
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98 byte[] rv = new byte[length()];
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99 readBytes(rv, 0, rv.length);
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100 return rv;
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101 }
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102 }