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annotate src/org/tmatesoft/hg/internal/Patch.java @ 329:694ebabb5cb3

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Refactor revlog patch mechanism, towards patch merging
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 13 Oct 2011 03:30:50 +0200
parents
children 9747a786a34d
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329
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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
694ebabb5cb3 Refactor revlog patch mechanism, towards patch merging
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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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18
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19 import java.io.IOException;
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20 import java.util.ArrayList;
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21
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22 /**
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23 * @see http://mercurial.selenic.com/wiki/BundleFormat, in Changelog group description
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24 *
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25 * range [start..end] in original source gets replaced with data of length (do not keep, use data.length instead)
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26 * range [end(i)..start(i+1)] is copied from the source
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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 final class Patch {
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32 private final IntVector starts, ends;
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33 private final ArrayList<byte[]> data;
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34
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35 public Patch() {
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36 starts = new IntVector();
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37 ends = new IntVector();
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38 data = new ArrayList<byte[]>();
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39 }
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40
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41 public int count() {
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42 return data.size();
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43 }
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44
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45 // number of bytes this patch will add (or remove, if negative) from the base revision
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46 private int patchSizeDelta() {
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47 int rv = 0;
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48 int prevEnd = 0;
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49 for (int i = 0, x = data.size(); i < x; i++) {
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50 final int start = starts.get(i);
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51 final int len = data.get(i).length;
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52 rv += start - prevEnd; // would copy from original
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53 rv += len; // and add new
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54 prevEnd = ends.get(i);
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55 }
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56 rv -= prevEnd;
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57 return rv;
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58 }
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59
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60 public byte[] apply(DataAccess baseRevisionContent, int outcomeLen) throws IOException {
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61 if (outcomeLen == -1) {
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62 outcomeLen = baseRevisionContent.length() + patchSizeDelta();
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63 }
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64 int prevEnd = 0, destIndex = 0;
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65 byte[] rv = new byte[outcomeLen];
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66 for (int i = 0, x = data.size(); i < x; i++) {
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67 final int start = starts.get(i);
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68 baseRevisionContent.seek(prevEnd);
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69 // copy source bytes that were not modified (up to start of the record)
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70 baseRevisionContent.readBytes(rv, destIndex, start - prevEnd);
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71 destIndex += start - prevEnd;
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72 // insert new data from the patch, if any
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73 byte[] d = data.get(i);
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74 System.arraycopy(d, 0, rv, destIndex, d.length);
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75 destIndex += d.length;
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76 prevEnd = ends.get(i);
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77 }
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78 baseRevisionContent.seek(prevEnd);
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79 // copy everything in the source past last record's end
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80 baseRevisionContent.readBytes(rv, destIndex, (int) (baseRevisionContent.length() - prevEnd));
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81 return rv;
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82 }
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83
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84 public void clear() {
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85 starts.clear();
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86 ends.clear();
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87 data.clear();
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88 }
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89
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90 /**
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91 * Initialize instance from stream. Any previous patch information (i.e. if instance if reused) is cleared first.
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92 * Read up to the end of DataAccess and interpret data as patch records.
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93 */
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94 public void read(DataAccess da) throws IOException {
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95 clear();
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96 while (!da.isEmpty()) {
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97 readOne(da);
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98 }
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99 }
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100
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101 /**
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102 * Caller is responsible to ensure stream got some data to read
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103 */
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104 public void readOne(DataAccess da) throws IOException {
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105 int s = da.readInt();
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106 int e = da.readInt();
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107 int len = da.readInt();
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108 byte[] src = new byte[len];
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109 da.readBytes(src, 0, len);
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110 starts.add(s);
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111 ends.add(e);
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112 data.add(src);
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113 }
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114
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115 /*
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116 private void add(Patch another, int index) {
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117 starts.add(another.starts.get(index));
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118 ends.add(another.ends.get(index));
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119 data.add(another.data.get(index));
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120 }
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121
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122 /**
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123 * Modify this patch with subsequent patch
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124 * /
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125 public void apply(Patch another) {
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126 Patch r = new Patch();
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127 int p1AppliedPos = 0;
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128 int p1PrevEnd = 0;
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129 for (int i = 0, j = 0, iMax = another.count(), jMax = this.count(); i < iMax; i++) {
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130 int newerPatchEntryStart = another.starts.get(i);
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131 int olderPatchEntryEnd;
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132
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133 while (j < jMax) {
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134 if (starts.get(j) < newerPatchEntryStart) {
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135 if (starts.get(j)+data.get(j).length <= newerPatchEntryStart) {
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136 r.add(this, j);
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137 } else {
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138 int newLen = newerPatchEntryStart - starts.get(j);
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139 int newEnd = ends.get(j) <= newerPatchEntryStart ? ends.get(j) : newerPatchEntryStart;
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140 r.add(starts.get(j), newEnd, data.get(j), newLen);
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141 break;
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142 }
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143 }
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144 p1AppliedPos += starts.get(j) - p1PrevEnd;
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145 p1AppliedPos += data.get(j).length;
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146 p1PrevEnd = ends.get(j);
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147 j++;
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148 }
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149 r.add(newerPatchEntryStart, another.ends.get(i), another.data.get(i));
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150 p1AppliedPos += newerPatchEntryStart + p1PrevEnd - another.data.get(i).length;
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151 // either j == jMax and another(i, i+1, ..., iMax) need to be just copied
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152 // or new patch entry starts before end of one of original patch entries
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153 if (olderPatchEntryEnd > (destPosition + newerPatchEntryStart)) {
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154 destPosition += starts.get(j) - prevEnd; // count those in the original stream up to old patch start
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155 int newLen = newerPatchEntryStart - destPosition;
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156 }
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157 }
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158 }
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159 */
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160 }