Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DiffHelper.java @ 574:88afffd39899

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Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 14:44:57 +0200
parents e55f17a7a195
children 47dfa0ec7e35
rev   line source
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1 /*
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2 * Copyright (c) 2013 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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18
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19 import java.util.ArrayList;
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20 import java.util.HashMap;
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21 import java.util.Map;
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22
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23 import org.tmatesoft.hg.repo.HgInvalidStateException;
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24
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25 /**
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26 * Mercurial cares about changes only up to the line level, e.g. a simple file version dump in manifest looks like (RevlogDump output):
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27 *
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28 * 522: 233748 0 103 17438 433 522 521 -1 756073cf2321df44d3ed0585f2a5754bc8a1b2f6
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29 * <PATCH>:
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30 * 3487..3578, 91:src/org/tmatesoft/hg/core/HgIterateDirection.java\00add61a8a665c5d8f092210767f812fe0d335ac8
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31 *
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32 * I.e. for the {fname}{revision} entry format of manifest, not only {revision} is changed, but the whole line, with unchanged {fname} is recorded
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33 * in the patch.
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34 *
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35 * Mercurial paper describes reasons for choosing this approach to delta generation, too.
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36 *
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class DiffHelper<T extends DiffHelper.ChunkSequence<?>> {
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42
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43 private Map<Object, IntVector> chunk2UseIndex;
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44 private T seq1, seq2;
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45
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46 // get filled by #longestMatch, track start of common sequence in seq1 and seq2, respectively
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47 private int matchStartS1, matchStartS2;
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48
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49 private MatchInspector<T> matchInspector;
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50
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51 public void init(T s1, T s2) {
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52 seq1 = s1;
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53 seq2 = s2;
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54 prepare(s2);
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55 }
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56
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57 public void init(T s1) {
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58 if (seq2 == null) {
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59 throw new IllegalStateException("Use this #init() only when target sequence shall be matched against different origin");
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60 }
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61 seq1 = s1;
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62 }
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63
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64
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65 private void prepare(T s2) {
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66 chunk2UseIndex = new HashMap<Object, IntVector>();
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67 for (int i = 0, len = s2.chunkCount(); i < len; i++) {
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68 Object bc = s2.chunk(i);
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69 IntVector loc = chunk2UseIndex.get(bc);
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70 if (loc == null) {
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71 chunk2UseIndex.put(bc, loc = new IntVector());
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72 }
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73 loc.add(i);
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74 // bc.registerUseIn(i) - BEWARE, use of bc here is incorrect
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75 // in this case need to find the only ByteChain to keep indexes
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76 // i.e. when there are few equal ByteChain instances, notion of "usedIn" shall be either shared (reference same vector)
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77 // or kept within only one of them
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78 }
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79 }
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80
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81 public void findMatchingBlocks(MatchInspector<T> insp) {
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82 insp.begin(seq1, seq2);
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83 matchInspector = insp;
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84 findMatchingBlocks(0, seq1.chunkCount(), 0, seq2.chunkCount());
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85 insp.end();
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86 }
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87
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88 /**
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89 * implementation based on Python's difflib.py and SequenceMatcher
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90 */
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91 public int longestMatch(int startS1, int endS1, int startS2, int endS2) {
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92 matchStartS1 = matchStartS2 = 0;
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93 int maxLength = 0;
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94 IntMap<Integer> chunkIndex2MatchCount = new IntMap<Integer>(8);
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95 for (int i = startS1; i < endS1; i++) {
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96 Object bc = seq1.chunk(i);
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97 IntVector occurencesInS2 = chunk2UseIndex.get(bc);
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98 if (occurencesInS2 == null) {
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99 chunkIndex2MatchCount.clear();
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100 continue;
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101 }
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102 IntMap<Integer> newChunkIndex2MatchCount = new IntMap<Integer>(8);
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103 for (int j : occurencesInS2.toArray()) {
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104 // s1[i] == s2[j]
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105 if (j < startS2) {
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106 continue;
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107 }
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108 if (j >= endS2) {
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109 break;
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110 }
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111 int prevChunkMatches = chunkIndex2MatchCount.containsKey(j-1) ? chunkIndex2MatchCount.get(j-1) : 0;
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112 int k = prevChunkMatches + 1;
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113 newChunkIndex2MatchCount.put(j, k);
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114 if (k > maxLength) {
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115 matchStartS1 = i-k+1;
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116 matchStartS2 = j-k+1;
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117 maxLength = k;
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118 }
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119 }
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120 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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121 }
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122 return maxLength;
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123 }
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124
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125 private void findMatchingBlocks(int startS1, int endS1, int startS2, int endS2) {
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126 int matchLength = longestMatch(startS1, endS1, startS2, endS2);
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127 if (matchLength > 0) {
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128 final int saveStartS1 = matchStartS1, saveStartS2 = matchStartS2;
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129 if (startS1 < matchStartS1 && startS2 < matchStartS2) {
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130 findMatchingBlocks(startS1, matchStartS1, startS2, matchStartS2);
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131 }
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132 matchInspector.match(saveStartS1, saveStartS2, matchLength);
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133 if (saveStartS1+matchLength < endS1 && saveStartS2+matchLength < endS2) {
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134 findMatchingBlocks(saveStartS1 + matchLength, endS1, saveStartS2 + matchLength, endS2);
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135 }
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136 }
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137 }
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138
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139 public interface MatchInspector<T extends ChunkSequence<?>> {
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140 void begin(T s1, T s2);
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141 void match(int startSeq1, int startSeq2, int matchLength);
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142 void end();
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143 }
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144
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145 static class MatchDumpInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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146 private int matchCount;
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147
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148 public void begin(T s1, T s2) {
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149 matchCount = 0;
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150 }
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151
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152 public void match(int startSeq1, int startSeq2, int matchLength) {
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153 matchCount++;
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154 System.out.printf("match #%d: from line #%d and line #%d of length %d\n", matchCount, startSeq1, startSeq2, matchLength);
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155 }
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156
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157 public void end() {
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158 if (matchCount == 0) {
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159 System.out.println("NO MATCHES FOUND!");
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160 }
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161 }
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162 }
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163
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164 /**
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165 * Matcher implementation that translates "match/equal" notification to a delta-style "added/removed/changed".
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166 */
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167 public static class DeltaInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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168 protected int changeStartS1, changeStartS2;
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169 protected T seq1, seq2;
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170
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171 public void begin(T s1, T s2) {
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172 seq1 = s1;
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173 seq2 = s2;
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174 changeStartS1 = changeStartS2 = 0;
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175 }
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176
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177 public void match(int startSeq1, int startSeq2, int matchLength) {
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178 reportDeltaElement(startSeq1, startSeq2, matchLength);
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179 changeStartS1 = startSeq1 + matchLength;
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180 changeStartS2 = startSeq2 + matchLength;
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181 }
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182
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183 public void end() {
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184 if (changeStartS1 < seq1.chunkCount()-1 || changeStartS2 < seq2.chunkCount()-1) {
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185 reportDeltaElement(seq1.chunkCount()-1, seq2.chunkCount()-1, 0);
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186 }
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187 }
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188
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189 protected void reportDeltaElement(int matchStartSeq1, int matchStartSeq2, int matchLength) {
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190 if (changeStartS1 < matchStartSeq1) {
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191 if (changeStartS2 < matchStartSeq2) {
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192 changed(changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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193 } else {
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194 assert changeStartS2 == matchStartSeq2;
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195 deleted(matchStartSeq2, changeStartS1, matchStartSeq1);
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196 }
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197 } else {
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198 assert changeStartS1 == matchStartSeq1;
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199 if(changeStartS2 < matchStartSeq2) {
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200 added(changeStartS1, changeStartS2, matchStartSeq2);
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201 } else {
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202 assert changeStartS2 == matchStartSeq2;
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203 if (matchStartSeq1 > 0 || matchStartSeq2 > 0) {
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204 // FIXME perhaps, exception is too much for the case
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205 // once diff is covered with tests, replace with assert false : msg;
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206 throw new HgInvalidStateException(String.format("adjustent equal blocks %d, %d and %d,%d", changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2));
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207 }
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208 }
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209 }
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210 if (matchLength > 0) {
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211 unchanged(matchStartSeq1, matchStartSeq2, matchLength);
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212 }
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213 }
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214
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215 /**
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216 * [s1From..s1To) replaced with [s2From..s2To)
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217 */
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218 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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219 // NO-OP
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220 }
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221
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222 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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223 // NO-OP
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224 }
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225
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226 protected void added(int s1InsertPoint, int s2From, int s2To) {
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227 // NO-OP
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228 }
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229
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230 protected void unchanged(int s1From, int s2From, int length) {
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231 // NO-OP
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232 }
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233 }
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234
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235 static class DeltaDumpInspector<T extends ChunkSequence<?>> extends DeltaInspector<T> {
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236
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237 @Override
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238 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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239 System.out.printf("changed [%d..%d) with [%d..%d)\n", s1From, s1To, s2From, s2To);
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240 }
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241
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242 @Override
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243 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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244 System.out.printf("deleted [%d..%d)\n", s1From, s1To);
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245 }
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246
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247 @Override
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248 protected void added(int s1InsertPoint, int s2From, int s2To) {
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249 System.out.printf("added [%d..%d) at %d\n", s2From, s2To, s1InsertPoint);
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250 }
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251
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252 @Override
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253 protected void unchanged(int s1From, int s2From, int length) {
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254 System.out.printf("same [%d..%d) and [%d..%d)\n", s1From, s1From + length, s2From, s2From + length);
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255 }
542
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256 }
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257
544
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258 /**
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259 * Generic sequence of chunk, where chunk is anything comparable to another chunk, e.g. a string or a single char
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260 * Sequence diff algorithm above doesn't care about sequence nature.
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261 */
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262 public interface ChunkSequence<T> {
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263 public T chunk(int index);
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264 public int chunkCount();
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265 }
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266
551
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267 public static final class LineSequence implements ChunkSequence<LineSequence.ByteChain> {
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268
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269 private final byte[] input;
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270 private ArrayList<ByteChain> lines;
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271
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272 public LineSequence(byte[] data) {
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273 input = data;
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274 }
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275
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276 public static LineSequence newlines(byte[] array) {
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277 return new LineSequence(array).splitByNewlines();
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278 }
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279
545
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280 // sequence ends with fake, empty line chunk
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281 public LineSequence splitByNewlines() {
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282 lines = new ArrayList<ByteChain>();
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283 int lastStart = 0;
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284 for (int i = 0; i < input.length; i++) {
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285 if (input[i] == '\n') {
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286 lines.add(new ByteChain(lastStart, i+1));
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287 lastStart = i+1;
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288 } else if (input[i] == '\r') {
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289 if (i+1 < input.length && input[i+1] == '\n') {
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290 i++;
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291 }
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292 lines.add(new ByteChain(lastStart, i+1));
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293 lastStart = i+1;
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294 }
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295 }
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296 if (lastStart < input.length) {
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297 lines.add(new ByteChain(lastStart, input.length));
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298 }
538
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299 // empty chunk to keep offset of input end
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300 lines.add(new ByteChain(input.length));
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301 return this;
533
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302 }
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303
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304 public ByteChain chunk(int index) {
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305 return lines.get(index);
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306 }
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307
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308 public int chunkCount() {
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309 return lines.size();
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310 }
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311
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312 public byte[] data(int chunkFrom, int chunkTo) {
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313 if (chunkFrom == chunkTo) {
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314 return new byte[0];
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315 }
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316 int from = chunk(chunkFrom).getOffset(), to = chunk(chunkTo).getOffset();
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317 byte[] rv = new byte[to - from];
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318 System.arraycopy(input, from, rv, 0, rv.length);
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319 return rv;
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320 }
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321
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322
556
e55f17a7a195 AnnotateFacility renamed to HgBlameFacility and exposed, API shapes out and got some javadoc
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323 public final class ByteChain {
533
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324 private final int start, end;
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325 private final int hash;
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326
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327 /**
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328 * construct a chunk with a sole purpose to keep
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329 * offset of the data end
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330 */
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331 ByteChain(int offset) {
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332 start = end = offset;
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333 // ensure this chunk doesn't match trailing chunk of another sequence
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334 hash = System.identityHashCode(this);
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335 }
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336
533
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337 ByteChain(int s, int e) {
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338 start = s;
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339 end = e;
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340 hash = calcHash(input, s, e);
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341 }
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342
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343 /**
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344 * byte offset of the this ByteChain inside ChainSequence
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345 */
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346 public int getOffset() {
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347 return start;
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348 }
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349
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350 public byte[] data() {
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351 byte[] rv = new byte[end - start];
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352 System.arraycopy(input, start, rv, 0, rv.length);
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353 return rv;
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354 }
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355
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356 @Override
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357 public boolean equals(Object obj) {
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358 if (obj == null || obj.getClass() != ByteChain.class) {
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359 return false;
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360 }
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361 ByteChain other = (ByteChain) obj;
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362 if (other.hash != hash || other.end - other.start != end - start) {
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363 return false;
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364 }
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365 return other.match(input, start);
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366 }
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367
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368 private boolean match(byte[] oi, int from) {
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369 for (int i = start, j = from; i < end; i++, j++) {
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370 if (LineSequence.this.input[i] != oi[j]) {
533
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371 return false;
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372 }
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373 }
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374 return true;
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375 }
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376
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377 @Override
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378 public int hashCode() {
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379 return hash;
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380 }
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381
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382 @Override
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383 public String toString() {
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384 return String.format("[@%d\"%s\"]", start, new String(data()));
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385 }
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386 }
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387
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388 // same as Arrays.hashCode(byte[]), just for a slice of a bigger array
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389 static int calcHash(byte[] data, int from, int to) {
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390 int result = 1;
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391 for (int i = from; i < to; i++) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
392 result = 31 * result + data[i];
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
393 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
394 return result;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
395 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
396 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
397 }