Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/FileRenameHistory.java @ 699:a483b2b68a2e

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Provisional APIs and respective implementation for http, https and ssh remote repositories
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 08 Aug 2013 19:18:50 +0200
parents 7efabe0cddcf
children
rev   line source
691
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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 static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.Collections;
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24 import java.util.LinkedList;
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25 import java.util.List;
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26
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27 import org.tmatesoft.hg.core.HgFileRevision;
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28 import org.tmatesoft.hg.core.HgIterateDirection;
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29 import org.tmatesoft.hg.repo.HgDataFile;
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30 import org.tmatesoft.hg.repo.HgRepository;
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31 import org.tmatesoft.hg.repo.HgRuntimeException;
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32
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33 /**
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34 * Traces file renames. Quite similar to HgChangesetFileSneaker, although the latter tries different paths
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35 * to find origin names, while this class traces first renames found only.
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public final class FileRenameHistory {
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41
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42 private final int csetFrom;
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43 private final int csetTo;
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44 private final List<Chunk> history;
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45
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46 public FileRenameHistory(int csetStartIndex, int csetEndIndex) {
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47 csetFrom = csetStartIndex;
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48 csetTo = csetEndIndex;
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49 history = new ArrayList<Chunk>(3);
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50 }
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51
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52 public int startChangeset() {
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53 return csetFrom;
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54 }
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55
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56 public int endChangeset() {
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57 return csetTo;
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58 }
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59
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60 public boolean isOutOfRange(HgDataFile df, int fileRev) {
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61 return df.getChangesetRevisionIndex(fileRev) < csetFrom || df.getChangesetRevisionIndex(0) > csetTo;
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62 }
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63
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64 public void build(HgDataFile df, int fileRev) {
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65 assert !isOutOfRange(df, fileRev);
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66 LinkedList<Chunk> chunks = new LinkedList<Chunk>();
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67 int chunkStart = 0, chunkEnd = fileRev;
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68 int csetChunkEnd = -1, csetChunkStart = -1;
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69 BasicRevMap csetMap = new BasicRevMap(0, fileRev).collect(df);
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70 while (fileRev >= 0) {
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71 int cset = csetMap.changesetAt(fileRev);
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72 if (csetChunkEnd == -1) {
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73 csetChunkEnd = cset;
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74 }
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75 if (cset <= csetFrom) {
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76 chunkStart = fileRev;
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77 csetChunkStart = csetFrom;
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78 break;
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79 }
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80 if (cset > csetTo) {
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81 chunkEnd = --fileRev;
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82 csetChunkEnd = -1;
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83 continue;
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84 }
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85 csetChunkStart = cset;
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86 if (df.isCopy(fileRev)) {
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87 chunks.addFirst(new Chunk(df, fileRev, chunkEnd, csetChunkStart, csetChunkEnd));
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88 HgFileRevision origin = df.getCopySource(fileRev);
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89 df = df.getRepo().getFileNode(origin.getPath());
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90 fileRev = chunkEnd = df.getRevisionIndex(origin.getRevision());
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91 csetMap = new BasicRevMap(0, fileRev).collect(df);
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92 chunkStart = 0;
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93 csetChunkEnd = cset - 1; // if df is copy, cset can't be 0
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94 csetChunkStart = -1;
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95 } else {
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96 fileRev--;
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97 }
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98 }
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99 assert chunkStart >= 0;
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100 assert chunkEnd >= 0; // can be negative only if df.cset(0) > csetTo
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101 assert csetChunkEnd >= 0;
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102 assert csetChunkStart >= 0;
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103 chunks.addFirst(new Chunk(df, chunkStart, chunkEnd, csetChunkStart, csetChunkEnd));
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104
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105 history.clear();
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106 history.addAll(chunks);
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107 }
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108
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109 public Iterable<Chunk> iterate(HgIterateDirection order) {
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110 if (order == HgIterateDirection.NewToOld) {
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111 return ReverseIterator.reversed(history);
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112 }
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113 assert order == HgIterateDirection.OldToNew;
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114 return Collections.unmodifiableList(history);
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115 }
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116
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117 public int chunks() {
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118 return history.size();
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119 }
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120
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121 public Chunk chunkAt(int cset) {
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122 if (cset < csetFrom || cset > csetTo) {
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123 return null;
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124 }
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125 for (Chunk c : history) {
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126 if (c.firstCset() > cset) {
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127 break;
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128 }
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129 if (cset <= c.lastCset()) {
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130 return c;
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131 }
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132 }
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133 return null;
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134 }
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135
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136
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137 /**
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138 * file has changes [firstFileRev..lastFileRev] that have occurred somewhere in [firstCset..lastCset]
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139 */
694
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140 public static final class Chunk {
691
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141 private final HgDataFile df;
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142 private final int fileRevFrom;
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143 private final int fileRevTo;
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144 private final int csetFrom;
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145 private final int csetTo;
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146 Chunk(HgDataFile file, int fileRevStart, int fileRevEnd, int csetStart, int csetEnd) {
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147 df = file;
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148 fileRevFrom = fileRevStart;
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149 fileRevTo = fileRevEnd;
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150 csetFrom = csetStart;
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151 csetTo = csetEnd;
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152 }
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153 public HgDataFile file() {
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154 return df;
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155 }
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156 public int firstFileRev() {
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157 return fileRevFrom;
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158 }
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159 public int lastFileRev() {
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160 return fileRevTo;
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161 }
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162 public int firstCset() {
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163 return csetFrom;
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164 }
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165 public int lastCset() {
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166 return csetTo;
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167 }
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168 }
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169
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170 private static final class BasicRevMap implements HgDataFile.LinkRevisionInspector {
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171 private final int[] revs;
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172 private final int fromRev;
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173 private final int toRev;
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174 public BasicRevMap(int startRev, int endRev) {
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175 revs = new int[endRev+1]; // for simplicity, just ignore startRev now (it's 0 in local use anyway)
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176 fromRev = startRev;
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177 toRev = endRev;
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178 Arrays.fill(revs, BAD_REVISION);
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179 }
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180
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181 public BasicRevMap collect(HgDataFile df) {
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182 df.indexWalk(fromRev, toRev, this);
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183 return this;
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184 }
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185
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186 public void next(int revisionIndex, int linkedRevisionIndex) throws HgRuntimeException {
7efabe0cddcf Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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187 revs[revisionIndex] = linkedRevisionIndex;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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188 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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189
7efabe0cddcf Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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190 /**
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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191 * @return {@link HgRepository#BAD_REVISION} if there's no mapping
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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192 */
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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193 public int changesetAt(int rev) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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194 return revs[rev];
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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195 }
7efabe0cddcf Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 691
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196 }
691
72fc7774b87e Fix file.isCopy() for blame/annotate. Refactor status and blame to use newly introduced FileHistory helper that builds file rename history
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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197 }