Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/ByteArrayDataAccess.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 545b1d4cc11d
children
rev   line source
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1 /*
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2 * Copyright (c) 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
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21
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22 /**
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public class ByteArrayDataAccess extends DataAccess {
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28
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29 private final byte[] data;
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30 private final int offset;
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31 private final int length;
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32 private int pos;
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33
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34 public ByteArrayDataAccess(byte[] data) {
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35 this(data, 0, data.length);
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36 }
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38 public ByteArrayDataAccess(byte[] data, int offset, int length) {
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39 this.data = data;
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40 this.offset = offset;
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41 this.length = length;
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42 pos = 0;
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43 }
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45 @Override
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46 public byte readByte() throws IOException {
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47 if (pos >= length) {
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48 throw new IOException();
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49 }
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50 return data[offset + pos++];
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51 }
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52 @Override
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53 public void readBytes(byte[] buf, int off, int len) throws IOException {
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54 if (len > (this.length - pos)) {
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55 throw new IOException(String.format("Requested %d bytes at position %d of %d total", len, pos, length));
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56 }
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57 System.arraycopy(data, offset+pos, buf, off, len);
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58 pos += len;
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59 }
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60 @Override
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61 public int readInt() throws IOException {
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62 // overridden not to create an intermediate array
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63 if (length - pos < 4) {
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64 throw new IOException();
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65 }
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66 int x = offset + pos;
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67 int rv = data[x++] << 24 | (data[x++] & 0xFF) << 16 | (data[x++] & 0xFF) << 8 | (data[x] & 0xFF);
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68 pos += 4;
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69 return rv;
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70 }
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71 @Override
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72 public long readLong() throws IOException {
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73 // overridden not to create an intermediate array
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74 if (length - pos < 8) {
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75 throw new IOException();
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76 }
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77 int x = offset + pos;
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78 int i1 = data[x++] << 24 | (data[x++] & 0xFF) << 16 | (data[x++] & 0xFF) << 8 | (data[x++] & 0xFF);
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79 int i2 = data[x++] << 24 | (data[x++] & 0xFF) << 16 | (data[x++] & 0xFF) << 8 | (data[x] & 0xFF);
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80 pos += 8;
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81 return ((long) i1) << 32 | ((long) i2 & 0x0FFFFFFFFl);
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82 }
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83
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84 @Override
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85 public ByteArrayDataAccess reset() {
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86 pos = 0;
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87 return this;
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88 }
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89 @Override
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90 public int length() {
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91 return length;
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92 }
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93 @Override
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94 public void seek(int offset) {
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95 pos = offset;
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96 }
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97 @Override
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98 public void skip(int bytes) {
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99 seek(pos + bytes);
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100 }
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101 @Override
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102 public boolean isEmpty() {
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103 return pos >= length;
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104 }
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105
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106 //
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107
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108 // when byte[] needed from DA, we may save few cycles and some memory giving this (otherwise unsafe) access to underlying data
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109 @Override
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110 public byte[] byteArray() {
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111 return data;
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112 }
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113 }