Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 248:3fbfce107f94

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 12 Aug 2011 18:48:57 +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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116
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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 {
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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) {
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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238 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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239 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
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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
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parents: 196
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242 }
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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243 }
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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244 }
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08db726a0fb7 Shaping out low-level Hg structures
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245 }