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annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 325:f05c8b1f08c4

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Explicit dependency for cmdline build
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 03 Oct 2011 06:54:43 +0200
parents 283b294d1079
children d42a45a2c9d6
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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18
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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20
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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.DigestHelper;
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30 import org.tmatesoft.hg.internal.EncodingHelper;
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31 import org.tmatesoft.hg.internal.Experimental;
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32 import org.tmatesoft.hg.internal.IterateControlMediator;
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33 import org.tmatesoft.hg.internal.Lifecycle;
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34 import org.tmatesoft.hg.internal.Pool2;
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35 import org.tmatesoft.hg.internal.RevlogStream;
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36 import org.tmatesoft.hg.util.CancelSupport;
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37 import org.tmatesoft.hg.util.Path;
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38 import org.tmatesoft.hg.util.ProgressSupport;
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39
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40
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41 /**
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgManifest extends Revlog {
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47 private RevisionMapper revisionMap;
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48
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49 public enum Flags {
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50 Exec, Link;
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51
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52 static Flags parse(String flags) {
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53 if ("x".equalsIgnoreCase(flags)) {
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54 return Exec;
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55 }
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56 if ("l".equalsIgnoreCase(flags)) {
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57 return Link;
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58 }
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59 if (flags == null) {
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60 return null;
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61 }
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62 throw new IllegalStateException(flags);
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63 }
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64
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65 static Flags parse(byte[] data, int start, int length) {
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66 if (length == 0) {
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67 return null;
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68 }
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69 if (length == 1) {
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70 if (data[start] == 'x') {
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71 return Exec;
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72 }
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73 if (data[start] == 'l') {
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74 return Link;
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75 }
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76 // FALL THROUGH
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77 }
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78 throw new IllegalStateException(new String(data, start, length));
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79 }
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80
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81 String nativeString() {
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82 if (this == Exec) {
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83 return "x";
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84 }
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85 if (this == Link) {
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86 return "l";
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87 }
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88 throw new IllegalStateException(toString());
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89 }
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90 }
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92 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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93 super(hgRepo, content);
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94 }
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95
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96 /**
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97 *
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98 * @param start changelog (not manifest!) revision to begin with
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99 * @param end changelog (not manifest!) revision to stop, inclusive.
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100 * @param inspector can't be <code>null</code>
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101 */
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102 public void walk(int start, int end, final Inspector inspector) {
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103 if (inspector == null) {
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104 throw new IllegalArgumentException();
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105 }
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106 int start0 = fromChangelog(start);
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107 int end0 = fromChangelog(end);
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108 if (end0 < start0) {
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109 // there are tool-constructed repositories that got order of changeset revisions completely different from that of manifest
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110 int x = end0;
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111 end0 = start0;
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112 start0 = x;
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113 }
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114 content.iterate(start0, end0, true, new ManifestParser(inspector));
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115 }
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117 /**
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118 * "Sparse" iteration of the manifest
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119 *
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120 * @param inspector
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121 * @param localRevisions local changeset revisions to visit
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122 */
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123 public void walk(final Inspector inspector, int... localRevisions) {
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124 if (inspector == null || localRevisions == null) {
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125 throw new IllegalArgumentException();
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126 }
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127 int[] manifestLocalRevs = new int[localRevisions.length];
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128 boolean needsSort = false;
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129 for (int i = 0; i < localRevisions.length; i++) {
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130 final int manifestLocalRev = fromChangelog(localRevisions[i]);
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131 manifestLocalRevs[i] = manifestLocalRev;
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132 if (i > 0 && manifestLocalRevs[i-1] > manifestLocalRev) {
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133 needsSort = true;
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134 }
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135 }
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136 if (needsSort) {
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137 Arrays.sort(manifestLocalRevs);
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138 }
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139 content.iterate(manifestLocalRevs, true, new ManifestParser(inspector));
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140 }
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141
232
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142 // manifest revision number that corresponds to the given changeset
218
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143 /*package-local*/ int fromChangelog(int revisionNumber) {
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144 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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145 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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146 }
257
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147 if (revisionNumber == HgRepository.WORKING_COPY || revisionNumber == HgRepository.BAD_REVISION) {
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148 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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149 }
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150 // revisionNumber == TIP is processed by RevisionMapper
218
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151 if (revisionMap == null) {
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152 revisionMap = new RevisionMapper(getRepo());
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153 content.iterate(0, TIP, false, revisionMap);
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154 }
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155 return revisionMap.at(revisionNumber);
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156 }
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157
232
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158 /**
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159 * Extracts file revision as it was known at the time of given changeset.
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160 *
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161 * @param revisionNumber local changeset index
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162 * @param file path to file in question
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163 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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164 */
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165 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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166 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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167 int rev = fromChangelog(revisionNumber);
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168 final Nodeid[] rv = new Nodeid[] { null };
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169 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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170
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171 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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172 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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173 try {
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174 byte b;
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175 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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176 if (b != 0) {
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177 bos.write(b);
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178 } else {
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179 String fname = new String(bos.toByteArray());
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180 bos.reset();
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181 if (file.toString().equals(fname)) {
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182 byte[] nid = new byte[40];
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183 data.readBytes(nid, 0, 40);
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184 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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185 break;
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186 }
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187 // else skip to the end of line
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188 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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189 ;
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190 }
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191 }
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192 } catch (IOException ex) {
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193 throw new HgBadStateException(ex);
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194 }
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195 }
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196 });
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197 return rv[0];
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198 }
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199
19
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200 public interface Inspector {
222
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201 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
285
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202 /**
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203 * @deprecated switch to {@link Inspector2#next(Nodeid, Path, Flags)}
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204 */
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205 @Deprecated
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206 boolean next(Nodeid nid, String fname, String flags);
222
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207 boolean end(int manifestRevision);
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208 }
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209
285
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210 @Experimental(reason="Explore Path alternative for filenames and enum for flags")
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211 public interface Inspector2 extends Inspector {
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212 boolean next(Nodeid nid, Path fname, Flags flags);
267
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213 }
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214
268
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215 /**
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216 * When Pool uses Strings directly,
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217 * ManifestParser creates new String instance with new char[] value, and does byte->char conversion.
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218 * For cpython repo, walk(0..10k), there are over 16 million filenames, of them only 3020 unique.
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219 * This means there are 15.9 million useless char[] instances and byte->char conversions
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220 *
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221 * When String (Path) is wrapped into {@link PathProxy}, there's extra overhead of byte[] representation
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222 * of the String, but these are only for unique Strings (Paths) (3020 in the example above). Besides, I save
268
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223 * useless char[] and byte->char conversions.
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224 */
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225 private static class PathProxy {
267
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226 private byte[] data;
268
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227 private int start;
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228 private final int hash, length;
285
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229 private Path result;
267
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230
285
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231 public PathProxy(byte[] data, int start, int length) {
267
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232 this.data = data;
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233 this.start = start;
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234 this.length = length;
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235
268
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236 // copy from String.hashCode(). In fact, not necessarily match result of String(data).hashCode
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237 // just need some nice algorithm here
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diff changeset
238 int h = 0;
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239 byte[] d = data;
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240 for (int i = 0, off = start, len = length; i < len; i++) {
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241 h = 31 * h + d[off++];
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242 }
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243 hash = h;
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244 }
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245
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246 @Override
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247 public boolean equals(Object obj) {
285
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248 if (false == obj instanceof PathProxy) {
267
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249 return false;
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250 }
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251 PathProxy o = (PathProxy) obj;
267
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252 if (o.result != null && result != null) {
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253 return result.equals(o.result);
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254 }
268
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255 if (o.length != length || o.hash != hash) {
267
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256 return false;
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257 }
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258 for (int i = 0, x = o.start, y = start; i < length; i++) {
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259 if (o.data[x++] != data[y++]) {
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260 return false;
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261 }
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262 }
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263 return true;
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264 }
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265 @Override
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266 public int hashCode() {
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267 return hash;
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268 }
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269
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270 public Path freeze() {
267
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271 if (result == null) {
320
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272 result = Path.create(EncodingHelper.fromManifest(data, start, length));
268
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273 // release reference to bigger data array, make a copy of relevant part only
285
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274 // use original bytes, not those from String above to avoid cache misses due to different encodings
268
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275 byte[] d = new byte[length];
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276 System.arraycopy(data, start, d, 0, length);
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277 data = d;
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278 start = 0;
267
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279 }
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280 return result;
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281 }
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282 }
196
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283
312
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284 private static class ManifestParser implements RevlogStream.Inspector, Lifecycle {
196
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285 private final Inspector inspector;
285
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286 private final Inspector2 inspector2;
304
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287 private Pool2<Nodeid> nodeidPool, thisRevPool;
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288 private final Pool2<PathProxy> fnamePool;
266
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289 private byte[] nodeidLookupBuffer = new byte[20]; // get reassigned each time new Nodeid is added to pool
312
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290 private final ProgressSupport progressHelper;
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291 private IterateControlMediator iterateControl;
262
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292
196
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293 public ManifestParser(Inspector delegate) {
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294 assert delegate != null;
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295 inspector = delegate;
285
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296 inspector2 = delegate instanceof Inspector2 ? (Inspector2) delegate : null;
304
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297 nodeidPool = new Pool2<Nodeid>();
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298 fnamePool = new Pool2<PathProxy>();
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299 thisRevPool = new Pool2<Nodeid>();
312
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300 progressHelper = ProgressSupport.Factory.get(delegate);
196
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301 }
268
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302
196
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303 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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304 try {
312
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305 if (!inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision)) {
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306 iterateControl.stop();
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307 return;
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308 }
285
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309 Path fname = null;
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310 Flags flags = null;
196
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311 Nodeid nid = null;
267
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312 int i;
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313 byte[] data = da.byteArray();
312
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314 for (i = 0; i < actualLen; i++) {
267
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315 int x = i;
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316 for( ; data[i] != '\n' && i < actualLen; i++) {
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317 if (fname == null && data[i] == 0) {
285
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318 PathProxy px = fnamePool.unify(new PathProxy(data, x, i - x));
268
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319 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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320 // cpython 0..10k: hits: 15 989 152, misses: 3020
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321 fname = px.freeze();
267
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322 x = i+1;
196
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323 }
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324 }
267
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325 if (i < actualLen) {
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diff changeset
326 assert data[i] == '\n';
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327 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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328 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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329 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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330 Nodeid cached = nodeidPool.unify(nid);
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331 if (cached == nid) {
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332 // buffer now belongs to the cached nodeid
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333 nodeidLookupBuffer = new byte[20];
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334 } else {
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335 nid = cached; // use existing version, discard the lookup object
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336 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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337 thisRevPool.record(nid); // memorize revision for the next iteration.
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338 if (nodeidLen + x < i) {
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339 // 'x' and 'l' for executable bits and symlinks?
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340 // hg --debug manifest shows 644 for each regular file in my repo
285
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341 // for cpython 0..10k, there are 4361062 flag checks, and there's only 1 unique flag
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342 flags = Flags.parse(data, x + nodeidLen, i-x-nodeidLen);
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343 } else {
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344 flags = null;
267
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345 }
312
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346 boolean good2go;
285
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347 if (inspector2 == null) {
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348 String flagString = flags == null ? null : flags.nativeString();
312
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349 good2go = inspector.next(nid, fname.toString(), flagString);
285
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350 } else {
312
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351 good2go = inspector2.next(nid, fname, flags);
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352 }
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353 if (!good2go) {
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354 iterateControl.stop();
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diff changeset
355 return;
285
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diff changeset
356 }
267
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357 }
196
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358 nid = null;
285
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359 fname = null;
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360 flags = null;
196
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361 }
312
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362 if (!inspector.end(revisionNumber)) {
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diff changeset
363 iterateControl.stop();
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diff changeset
364 return;
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365 }
262
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366 //
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367 // keep only actual file revisions, found at this version
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368 // (next manifest is likely to refer to most of them, although in specific cases
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369 // like commit in another branch a lot may be useless)
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370 nodeidPool.clear();
304
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371 Pool2<Nodeid> t = nodeidPool;
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372 nodeidPool = thisRevPool;
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373 thisRevPool = t;
313
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374 iterateControl.checkCancelled();
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375 progressHelper.worked(1);
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376 } catch (IOException ex) {
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377 throw new HgBadStateException(ex);
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378 }
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379 }
312
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380
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381 public void start(int count, Callback callback, Object token) {
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382 CancelSupport cs = CancelSupport.Factory.get(inspector, null);
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383 iterateControl = new IterateControlMediator(cs, callback);
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384 progressHelper.start(count);
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385 }
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386
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387 public void finish(Object token) {
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388 progressHelper.done();
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389 }
196
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390 }
218
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391
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392 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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393
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394 private final int changelogRevisions;
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395 private int[] changelog2manifest;
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396 private final HgRepository repo;
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397
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398 public RevisionMapper(HgRepository hgRepo) {
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399 repo = hgRepo;
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400 changelogRevisions = repo.getChangelog().getRevisionCount();
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401 }
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402
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403 // respects TIP
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404 public int at(int revisionNumber) {
257
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405 if (revisionNumber == TIP) {
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406 revisionNumber = changelogRevisions - 1;
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407 }
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408 if (changelog2manifest != null) {
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409 return changelog2manifest[revisionNumber];
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410 }
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411 return revisionNumber;
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412 }
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413
324
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414 // XXX likely can be replaced with Revlog.RevisionInspector
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415 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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416 if (changelog2manifest != null) {
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417 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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418 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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419 // changeset records one and only one manifest nodeid
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420 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
218
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421 changelog2manifest[linkRevision] = revisionNumber;
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422 } else {
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423 if (revisionNumber != linkRevision) {
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424 changelog2manifest = new int[changelogRevisions];
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425 Arrays.fill(changelog2manifest, -1);
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426 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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427 ;
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428 changelog2manifest[linkRevision] = revisionNumber;
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429 }
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430 }
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431 }
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432
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433 public void start(int count, Callback callback, Object token) {
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434 if (count != changelogRevisions) {
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435 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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436 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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437 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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438 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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439 // in cpython repo are numbered makes me think aforementioned way)
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440 changelog2manifest = new int[changelogRevisions];
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441 Arrays.fill(changelog2manifest, -1);
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442 }
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443 }
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444
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445 public void finish(Object token) {
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446 if (changelog2manifest == null) {
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447 return;
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448 }
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449 // I assume there'd be not too many revisions we don't know manifest of
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450 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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451 for (int i = 0; i < changelog2manifest.length; i++) {
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452 if (changelog2manifest[i] == -1) {
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453 undefinedChangelogRevision.add(i);
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454 }
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455 }
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456 for (int u : undefinedChangelogRevision) {
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457 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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458 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
218
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459 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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460 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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461 }
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462 }
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463 }
2
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464 }