Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 233:1d389c0cb0a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Optimize file history walk not to iterat over whole changelog for sparse and distant revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 Jun 2011 04:50:09 +0200
parents b7347daa50e3
children a620f0663a37
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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.repo;
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import java.io.ByteArrayOutputStream;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Arrays;
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.Experimental;
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30 import org.tmatesoft.hg.internal.Lifecycle;
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31 import org.tmatesoft.hg.internal.Pool;
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32 import org.tmatesoft.hg.internal.RevlogStream;
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33 import org.tmatesoft.hg.util.Path;
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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 HgManifest extends Revlog {
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42 private RevisionMapper revisionMap;
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44 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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45 super(hgRepo, content);
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46 }
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48 /**
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49 *
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50 * @param start changelog (not manifest!) revision to begin with
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51 * @param end changelog (not manifest!) revision to stop, inclusive.
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52 * @param inspector can't be <code>null</code>
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53 */
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54 public void walk(int start, int end, final Inspector inspector) {
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55 if (inspector == null) {
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56 throw new IllegalArgumentException();
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57 }
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58 int start0 = fromChangelog(start);
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59 int end0 = fromChangelog(end);
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60 content.iterate(start0, end0, true, new ManifestParser(inspector));
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61 }
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63 // manifest revision number that corresponds to the given changeset
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64 /*package-local*/ int fromChangelog(int revisionNumber) {
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65 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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66 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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67 }
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68 if (revisionMap == null) {
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69 revisionMap = new RevisionMapper(getRepo());
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70 content.iterate(0, TIP, false, revisionMap);
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71 }
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72 return revisionMap.at(revisionNumber);
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73 }
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75 /**
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76 * Extracts file revision as it was known at the time of given changeset.
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77 *
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78 * @param revisionNumber local changeset index
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79 * @param file path to file in question
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80 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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81 */
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82 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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83 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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84 int rev = fromChangelog(revisionNumber);
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85 final Nodeid[] rv = new Nodeid[] { null };
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86 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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87
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88 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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89 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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90 try {
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91 byte b;
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92 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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93 if (b != 0) {
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94 bos.write(b);
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95 } else {
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96 String fname = new String(bos.toByteArray());
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97 bos.reset();
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98 if (file.toString().equals(fname)) {
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99 byte[] nid = new byte[40];
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100 data.readBytes(nid, 0, 40);
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101 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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102 break;
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103 }
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104 // else skip to the end of line
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105 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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106 ;
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107 }
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108 }
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109 } catch (IOException ex) {
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110 throw new HgBadStateException(ex);
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111 }
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112 }
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113 });
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114 return rv[0];
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115 }
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117 public interface Inspector {
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118 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
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119 boolean next(Nodeid nid, String fname, String flags);
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120 boolean end(int manifestRevision);
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121 }
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122
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123 private static class ManifestParser implements RevlogStream.Inspector {
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124 private boolean gtg = true; // good to go
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125 private final Inspector inspector;
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126 private final Pool<Nodeid> nodeidPool;
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127 private final Pool<String> fnamePool;
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128 private final Pool<String> flagsPool;
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129
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130 public ManifestParser(Inspector delegate) {
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131 assert delegate != null;
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132 inspector = delegate;
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133 nodeidPool = new Pool<Nodeid>();
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134 fnamePool = new Pool<String>();
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135 flagsPool = new Pool<String>();
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136 }
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137
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138 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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139 if (!gtg) {
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140 return;
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141 }
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142 try {
222
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143 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision);
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144 int i;
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145 String fname = null;
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146 String flags = null;
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147 Nodeid nid = null;
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148 byte[] data = da.byteArray();
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149 for (i = 0; gtg && i < actualLen; i++) {
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150 int x = i;
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151 for( ; data[i] != '\n' && i < actualLen; i++) {
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152 if (fname == null && data[i] == 0) {
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153 fname = fnamePool.unify(new String(data, x, i - x));
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154 x = i+1;
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155 }
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156 }
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157 if (i < actualLen) {
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158 assert data[i] == '\n';
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159 int nodeidLen = i - x < 40 ? i-x : 40;
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160 nid = nodeidPool.unify(Nodeid.fromAscii(data, x, nodeidLen));
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161 if (nodeidLen + x < i) {
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162 // 'x' and 'l' for executable bits and symlinks?
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163 // hg --debug manifest shows 644 for each regular file in my repo
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164 flags = flagsPool.unify(new String(data, x + nodeidLen, i-x-nodeidLen));
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165 }
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166 gtg = gtg && inspector.next(nid, fname, flags);
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167 }
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168 nid = null;
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169 fname = flags = null;
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170 }
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171 gtg = gtg && inspector.end(revisionNumber);
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172 } catch (IOException ex) {
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173 throw new HgBadStateException(ex);
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174 }
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175 }
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176 }
218
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177
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178 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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179
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180 private final int changelogRevisions;
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181 private int[] changelog2manifest;
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182 private final HgRepository repo;
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183
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184 public RevisionMapper(HgRepository hgRepo) {
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185 repo = hgRepo;
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186 changelogRevisions = repo.getChangelog().getRevisionCount();
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187 }
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188
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189 public int at(int revisionNumber) {
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190 if (changelog2manifest != null) {
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191 return changelog2manifest[revisionNumber];
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192 }
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193 return revisionNumber;
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194 }
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195
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196 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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197 if (changelog2manifest != null) {
220
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198 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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199 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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200 // changeset records one and only one manifest nodeid
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201 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
218
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202 changelog2manifest[linkRevision] = revisionNumber;
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203 } else {
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204 if (revisionNumber != linkRevision) {
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205 changelog2manifest = new int[changelogRevisions];
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206 Arrays.fill(changelog2manifest, -1);
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207 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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208 ;
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209 changelog2manifest[linkRevision] = revisionNumber;
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210 }
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211 }
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212 }
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213
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214 public void start(int count, Callback callback, Object token) {
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215 if (count != changelogRevisions) {
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216 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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217 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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218 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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219 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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220 // in cpython repo are numbered makes me think aforementioned way)
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221 changelog2manifest = new int[changelogRevisions];
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222 Arrays.fill(changelog2manifest, -1);
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223 }
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224 }
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225
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226 public void finish(Object token) {
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227 if (changelog2manifest == null) {
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228 return;
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229 }
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230 // I assume there'd be not too many revisions we don't know manifest of
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231 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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232 for (int i = 0; i < changelog2manifest.length; i++) {
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233 if (changelog2manifest[i] == -1) {
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234 undefinedChangelogRevision.add(i);
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235 }
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236 }
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237 for (int u : undefinedChangelogRevision) {
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parents: 196
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238 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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8de327242aa0 Basic information about branches
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239 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
218
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
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parents: 196
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240 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
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parents: 196
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241 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 196
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242 }
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 196
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243 }
047b1dec7a04 Issue 7: Correctly handle manifest and changelog with different number of (or non-matching) revisions
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 196
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244 }
2
08db726a0fb7 Shaping out low-level Hg structures
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245 }