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annotate src/org/tmatesoft/hg/internal/FileRenameHistory.java @ 691:72fc7774b87e

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Fix file.isCopy() for blame/annotate. Refactor status and blame to use newly introduced FileHistory helper that builds file rename history
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 02 Aug 2013 23:07:23 +0200
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children 7efabe0cddcf
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72fc7774b87e Fix file.isCopy() for blame/annotate. Refactor status and blame to use newly introduced FileHistory helper that builds file rename history
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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.Collections;
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21 import java.util.LinkedList;
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22 import java.util.List;
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23
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24 import org.tmatesoft.hg.core.HgFileRevision;
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25 import org.tmatesoft.hg.core.HgIterateDirection;
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26 import org.tmatesoft.hg.repo.HgDataFile;
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27
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28 /**
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29 * Traces file renames. Quite similar to HgChangesetFileSneaker, although the latter tries different paths
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30 * to find origin names, while this class traces first renames found only.
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public final class FileRenameHistory {
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36
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37 private final int csetFrom;
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38 private final int csetTo;
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39 private final List<Chunk> history;
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40
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41 public FileRenameHistory(int csetStartIndex, int csetEndIndex) {
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42 csetFrom = csetStartIndex;
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43 csetTo = csetEndIndex;
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44 history = new ArrayList<Chunk>(3);
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45 }
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46
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47 public int startChangeset() {
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48 return csetFrom;
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49 }
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50
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51 public int endChangeset() {
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52 return csetTo;
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53 }
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54
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55 public boolean isOutOfRange(HgDataFile df, int fileRev) {
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56 return df.getChangesetRevisionIndex(fileRev) < csetFrom || df.getChangesetRevisionIndex(0) > csetTo;
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57 }
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58
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59 public void build(HgDataFile df, int fileRev) {
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60 assert !isOutOfRange(df, fileRev);
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61 LinkedList<Chunk> chunks = new LinkedList<Chunk>();
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62 int chunkStart = 0, chunkEnd = fileRev;
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63 int csetChunkEnd = -1, csetChunkStart = -1;
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64 while (fileRev >= 0) {
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65 int cset = df.getChangesetRevisionIndex(fileRev);
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66 if (csetChunkEnd == -1) {
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67 csetChunkEnd = cset;
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68 }
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69 if (cset <= csetFrom) {
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70 chunkStart = fileRev;
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71 csetChunkStart = csetFrom;
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72 break;
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73 }
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74 if (cset > csetTo) {
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75 chunkEnd = --fileRev;
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76 csetChunkEnd = -1;
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77 continue;
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78 }
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79 csetChunkStart = cset;
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80 if (df.isCopy(fileRev)) {
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81 chunks.addFirst(new Chunk(df, fileRev, chunkEnd, csetChunkStart, csetChunkEnd));
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82 HgFileRevision origin = df.getCopySource(fileRev);
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83 df = df.getRepo().getFileNode(origin.getPath());
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84 fileRev = chunkEnd = df.getRevisionIndex(origin.getRevision());
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85 chunkStart = 0;
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86 csetChunkEnd = cset - 1; // if df is copy, cset can't be 0
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87 csetChunkStart = -1;
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88 } else {
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89 fileRev--;
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90 }
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91 }
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92 assert chunkStart >= 0;
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93 assert chunkEnd >= 0; // can be negative only if df.cset(0) > csetTo
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94 assert csetChunkEnd >= 0;
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95 assert csetChunkStart >= 0;
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96 chunks.addFirst(new Chunk(df, chunkStart, chunkEnd, csetChunkStart, csetChunkEnd));
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97
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98 history.clear();
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99 history.addAll(chunks);
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100 }
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101
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102 public Iterable<Chunk> iterate(HgIterateDirection order) {
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103 if (order == HgIterateDirection.NewToOld) {
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104 return ReverseIterator.reversed(history);
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105 }
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106 assert order == HgIterateDirection.OldToNew;
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107 return Collections.unmodifiableList(history);
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108 }
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109
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110 public int chunks() {
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111 return history.size();
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112 }
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113
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114 public Chunk chunkAt(int cset) {
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115 if (cset < csetFrom || cset > csetTo) {
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116 return null;
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117 }
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118 for (Chunk c : history) {
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119 if (c.firstCset() > cset) {
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120 break;
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121 }
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122 if (cset <= c.lastCset()) {
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123 return c;
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124 }
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125 }
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126 return null;
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127 }
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128
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129
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130 /**
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131 * file has changes [firstFileRev..lastFileRev] that have occurred somewhere in [firstCset..lastCset]
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132 */
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133 public static class Chunk {
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134 private final HgDataFile df;
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135 private final int fileRevFrom;
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136 private final int fileRevTo;
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137 private final int csetFrom;
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138 private final int csetTo;
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139 Chunk(HgDataFile file, int fileRevStart, int fileRevEnd, int csetStart, int csetEnd) {
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140 df = file;
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141 fileRevFrom = fileRevStart;
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142 fileRevTo = fileRevEnd;
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143 csetFrom = csetStart;
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144 csetTo = csetEnd;
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145 }
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146 public HgDataFile file() {
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147 return df;
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148 }
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149 public int firstFileRev() {
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150 return fileRevFrom;
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151 }
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152 public int lastFileRev() {
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153 return fileRevTo;
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154 }
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155 public int firstCset() {
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156 return csetFrom;
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157 }
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158 public int lastCset() {
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159 return csetTo;
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160 }
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161 }
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162 }