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annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 319:fa4aea41746e

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Sep 2011 04:37:52 +0200
parents c1e3c18fd2f2
children 678e326fd27c
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.Experimental;
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31 import org.tmatesoft.hg.internal.IterateControlMediator;
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32 import org.tmatesoft.hg.internal.Lifecycle;
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33 import org.tmatesoft.hg.internal.Pool2;
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34 import org.tmatesoft.hg.internal.RevlogStream;
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35 import org.tmatesoft.hg.util.CancelSupport;
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36 import org.tmatesoft.hg.util.Path;
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37 import org.tmatesoft.hg.util.ProgressSupport;
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38
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39
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40 /**
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class HgManifest extends Revlog {
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46 private RevisionMapper revisionMap;
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47
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48 public enum Flags {
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49 Exec, Link;
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50
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51 static Flags parse(String flags) {
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52 if ("x".equalsIgnoreCase(flags)) {
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53 return Exec;
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54 }
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55 if ("l".equalsIgnoreCase(flags)) {
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56 return Link;
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57 }
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58 if (flags == null) {
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59 return null;
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60 }
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61 throw new IllegalStateException(flags);
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62 }
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63
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64 static Flags parse(byte[] data, int start, int length) {
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65 if (length == 0) {
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66 return null;
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67 }
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68 if (length == 1) {
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69 if (data[start] == 'x') {
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70 return Exec;
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71 }
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72 if (data[start] == 'l') {
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73 return Link;
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74 }
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75 // FALL THROUGH
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76 }
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77 throw new IllegalStateException(new String(data, start, length));
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78 }
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79
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80 String nativeString() {
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81 if (this == Exec) {
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82 return "x";
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83 }
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84 if (this == Link) {
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85 return "l";
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86 }
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87 throw new IllegalStateException(toString());
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88 }
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89 }
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91 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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92 super(hgRepo, content);
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93 }
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94
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95 /**
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96 *
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97 * @param start changelog (not manifest!) revision to begin with
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98 * @param end changelog (not manifest!) revision to stop, inclusive.
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99 * @param inspector can't be <code>null</code>
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100 */
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101 public void walk(int start, int end, final Inspector inspector) {
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102 if (inspector == null) {
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103 throw new IllegalArgumentException();
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104 }
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105 int start0 = fromChangelog(start);
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106 int end0 = fromChangelog(end);
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107 if (end0 < start0) {
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108 // there are tool-constructed repositories that got order of changeset revisions completely different from that of manifest
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109 int x = end0;
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110 end0 = start0;
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111 start0 = x;
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112 }
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113 content.iterate(start0, end0, true, new ManifestParser(inspector));
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114 }
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116 /**
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117 * "Sparse" iteration of the manifest
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118 *
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119 * @param inspector
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120 * @param localRevisions local changeset revisions to visit
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121 */
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122 public void walk(final Inspector inspector, int... localRevisions) {
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123 if (inspector == null || localRevisions == null) {
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124 throw new IllegalArgumentException();
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125 }
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126 int[] manifestLocalRevs = new int[localRevisions.length];
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127 boolean needsSort = false;
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128 for (int i = 0; i < localRevisions.length; i++) {
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129 final int manifestLocalRev = fromChangelog(localRevisions[i]);
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130 manifestLocalRevs[i] = manifestLocalRev;
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131 if (i > 0 && manifestLocalRevs[i-1] > manifestLocalRev) {
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132 needsSort = true;
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133 }
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134 }
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135 if (needsSort) {
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136 Arrays.sort(manifestLocalRevs);
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137 }
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138 content.iterate(manifestLocalRevs, true, new ManifestParser(inspector));
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139 }
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140
232
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141 // manifest revision number that corresponds to the given changeset
218
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142 /*package-local*/ int fromChangelog(int revisionNumber) {
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143 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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144 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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145 }
257
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146 if (revisionNumber == HgRepository.WORKING_COPY || revisionNumber == HgRepository.BAD_REVISION) {
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147 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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148 }
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149 // revisionNumber == TIP is processed by RevisionMapper
218
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150 if (revisionMap == null) {
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151 revisionMap = new RevisionMapper(getRepo());
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152 content.iterate(0, TIP, false, revisionMap);
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153 }
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154 return revisionMap.at(revisionNumber);
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155 }
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156
232
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157 /**
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158 * Extracts file revision as it was known at the time of given changeset.
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159 *
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160 * @param revisionNumber local changeset index
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161 * @param file path to file in question
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162 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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163 */
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164 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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165 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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166 int rev = fromChangelog(revisionNumber);
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167 final Nodeid[] rv = new Nodeid[] { null };
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168 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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169
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170 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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171 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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172 try {
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173 byte b;
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174 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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175 if (b != 0) {
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176 bos.write(b);
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177 } else {
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178 String fname = new String(bos.toByteArray());
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179 bos.reset();
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180 if (file.toString().equals(fname)) {
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181 byte[] nid = new byte[40];
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182 data.readBytes(nid, 0, 40);
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183 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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184 break;
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185 }
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186 // else skip to the end of line
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187 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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188 ;
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189 }
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190 }
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191 } catch (IOException ex) {
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192 throw new HgBadStateException(ex);
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193 }
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194 }
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195 });
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196 return rv[0];
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197 }
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198
19
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199 public interface Inspector {
222
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200 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
285
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201 /**
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202 * @deprecated switch to {@link Inspector2#next(Nodeid, Path, Flags)}
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203 */
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204 @Deprecated
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205 boolean next(Nodeid nid, String fname, String flags);
222
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206 boolean end(int manifestRevision);
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207 }
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208
285
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209 @Experimental(reason="Explore Path alternative for filenames and enum for flags")
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210 public interface Inspector2 extends Inspector {
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211 boolean next(Nodeid nid, Path fname, Flags flags);
267
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212 }
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213
268
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214 /**
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215 * When Pool uses Strings directly,
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216 * ManifestParser creates new String instance with new char[] value, and does byte->char conversion.
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217 * For cpython repo, walk(0..10k), there are over 16 million filenames, of them only 3020 unique.
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218 * This means there are 15.9 million useless char[] instances and byte->char conversions
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219 *
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220 * When String (Path) is wrapped into {@link PathProxy}, there's extra overhead of byte[] representation
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221 * of the String, but these are only for unique Strings (Paths) (3020 in the example above). Besides, I save
268
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222 * useless char[] and byte->char conversions.
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223 */
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224 private static class PathProxy {
267
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225 private byte[] data;
268
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226 private int start;
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227 private final int hash, length;
285
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228 private Path result;
267
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229
285
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230 public PathProxy(byte[] data, int start, int length) {
267
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231 this.data = data;
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232 this.start = start;
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233 this.length = length;
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234
268
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235 // copy from String.hashCode(). In fact, not necessarily match result of String(data).hashCode
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236 // just need some nice algorithm here
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237 int h = 0;
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238 byte[] d = data;
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239 for (int i = 0, off = start, len = length; i < len; i++) {
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240 h = 31 * h + d[off++];
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241 }
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242 hash = h;
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243 }
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244
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245 @Override
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246 public boolean equals(Object obj) {
285
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247 if (false == obj instanceof PathProxy) {
267
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248 return false;
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249 }
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250 PathProxy o = (PathProxy) obj;
267
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251 if (o.result != null && result != null) {
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252 return result.equals(o.result);
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253 }
268
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254 if (o.length != length || o.hash != hash) {
267
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255 return false;
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256 }
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257 for (int i = 0, x = o.start, y = start; i < length; i++) {
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258 if (o.data[x++] != data[y++]) {
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259 return false;
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260 }
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261 }
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262 return true;
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263 }
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264 @Override
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265 public int hashCode() {
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266 return hash;
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267 }
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268
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269 public Path freeze() {
267
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270 if (result == null) {
285
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271 result = Path.create(new String(data, start, length));
268
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272 // release reference to bigger data array, make a copy of relevant part only
285
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273 // use original bytes, not those from String above to avoid cache misses due to different encodings
268
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274 byte[] d = new byte[length];
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275 System.arraycopy(data, start, d, 0, length);
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276 data = d;
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277 start = 0;
267
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278 }
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279 return result;
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280 }
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281 }
196
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282
312
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283 private static class ManifestParser implements RevlogStream.Inspector, Lifecycle {
196
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284 private final Inspector inspector;
285
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285 private final Inspector2 inspector2;
304
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286 private Pool2<Nodeid> nodeidPool, thisRevPool;
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287 private final Pool2<PathProxy> fnamePool;
266
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288 private byte[] nodeidLookupBuffer = new byte[20]; // get reassigned each time new Nodeid is added to pool
312
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289 private final ProgressSupport progressHelper;
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290 private IterateControlMediator iterateControl;
262
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291
196
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292 public ManifestParser(Inspector delegate) {
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293 assert delegate != null;
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294 inspector = delegate;
285
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295 inspector2 = delegate instanceof Inspector2 ? (Inspector2) delegate : null;
304
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296 nodeidPool = new Pool2<Nodeid>();
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297 fnamePool = new Pool2<PathProxy>();
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298 thisRevPool = new Pool2<Nodeid>();
312
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299 progressHelper = ProgressSupport.Factory.get(delegate);
196
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300 }
268
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301
196
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302 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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303 try {
312
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304 if (!inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision)) {
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305 iterateControl.stop();
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306 return;
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307 }
285
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308 Path fname = null;
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309 Flags flags = null;
196
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310 Nodeid nid = null;
267
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311 int i;
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312 byte[] data = da.byteArray();
312
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313 for (i = 0; i < actualLen; i++) {
267
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314 int x = i;
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315 for( ; data[i] != '\n' && i < actualLen; i++) {
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316 if (fname == null && data[i] == 0) {
285
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317 PathProxy px = fnamePool.unify(new PathProxy(data, x, i - x));
268
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318 // if (cached = fnamePool.unify(px))== px then cacheMiss, else cacheHit
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319 // cpython 0..10k: hits: 15 989 152, misses: 3020
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320 fname = px.freeze();
267
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321 x = i+1;
196
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322 }
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323 }
267
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324 if (i < actualLen) {
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diff changeset
325 assert data[i] == '\n';
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326 int nodeidLen = i - x < 40 ? i-x : 40; // if > 40, there are flags
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327 DigestHelper.ascii2bin(data, x, nodeidLen, nodeidLookupBuffer); // ignore return value as it's unlikely to have NULL in manifest
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328 nid = new Nodeid(nodeidLookupBuffer, false); // this Nodeid is for pool lookup only, mock object
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329 Nodeid cached = nodeidPool.unify(nid);
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330 if (cached == nid) {
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331 // buffer now belongs to the cached nodeid
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332 nodeidLookupBuffer = new byte[20];
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333 } else {
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334 nid = cached; // use existing version, discard the lookup object
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335 } // for cpython 0..10k, cache hits are 15 973 301, vs 18871 misses.
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diff changeset
336 thisRevPool.record(nid); // memorize revision for the next iteration.
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337 if (nodeidLen + x < i) {
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338 // 'x' and 'l' for executable bits and symlinks?
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339 // hg --debug manifest shows 644 for each regular file in my repo
285
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340 // for cpython 0..10k, there are 4361062 flag checks, and there's only 1 unique flag
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341 flags = Flags.parse(data, x + nodeidLen, i-x-nodeidLen);
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342 } else {
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343 flags = null;
267
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344 }
312
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345 boolean good2go;
285
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346 if (inspector2 == null) {
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347 String flagString = flags == null ? null : flags.nativeString();
312
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348 good2go = inspector.next(nid, fname.toString(), flagString);
285
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349 } else {
312
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350 good2go = inspector2.next(nid, fname, flags);
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351 }
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352 if (!good2go) {
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diff changeset
353 iterateControl.stop();
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diff changeset
354 return;
285
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diff changeset
355 }
267
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356 }
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357 nid = null;
285
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358 fname = null;
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359 flags = null;
196
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360 }
312
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diff changeset
361 if (!inspector.end(revisionNumber)) {
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diff changeset
362 iterateControl.stop();
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diff changeset
363 return;
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diff changeset
364 }
262
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365 //
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366 // keep only actual file revisions, found at this version
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367 // (next manifest is likely to refer to most of them, although in specific cases
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368 // like commit in another branch a lot may be useless)
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369 nodeidPool.clear();
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370 Pool2<Nodeid> t = nodeidPool;
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371 nodeidPool = thisRevPool;
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372 thisRevPool = t;
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373 iterateControl.checkCancelled();
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374 progressHelper.worked(1);
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375 } catch (IOException ex) {
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376 throw new HgBadStateException(ex);
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377 }
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378 }
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379
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380 public void start(int count, Callback callback, Object token) {
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381 CancelSupport cs = CancelSupport.Factory.get(inspector, null);
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382 iterateControl = new IterateControlMediator(cs, callback);
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383 progressHelper.start(count);
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384 }
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385
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386 public void finish(Object token) {
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387 progressHelper.done();
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388 }
196
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389 }
218
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390
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391 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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392
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393 private final int changelogRevisions;
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394 private int[] changelog2manifest;
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395 private final HgRepository repo;
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396
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397 public RevisionMapper(HgRepository hgRepo) {
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398 repo = hgRepo;
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399 changelogRevisions = repo.getChangelog().getRevisionCount();
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400 }
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401
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402 // respects TIP
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403 public int at(int revisionNumber) {
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404 if (revisionNumber == TIP) {
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405 revisionNumber = changelogRevisions - 1;
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406 }
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407 if (changelog2manifest != null) {
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408 return changelog2manifest[revisionNumber];
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409 }
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410 return revisionNumber;
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411 }
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412
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413 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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414 if (changelog2manifest != null) {
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415 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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416 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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417 // changeset records one and only one manifest nodeid
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418 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
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419 changelog2manifest[linkRevision] = revisionNumber;
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420 } else {
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421 if (revisionNumber != linkRevision) {
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422 changelog2manifest = new int[changelogRevisions];
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423 Arrays.fill(changelog2manifest, -1);
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424 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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425 ;
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426 changelog2manifest[linkRevision] = revisionNumber;
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427 }
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428 }
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429 }
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430
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431 public void start(int count, Callback callback, Object token) {
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432 if (count != changelogRevisions) {
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433 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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434 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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435 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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436 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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437 // in cpython repo are numbered makes me think aforementioned way)
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438 changelog2manifest = new int[changelogRevisions];
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439 Arrays.fill(changelog2manifest, -1);
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440 }
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441 }
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442
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443 public void finish(Object token) {
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444 if (changelog2manifest == null) {
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445 return;
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446 }
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447 // I assume there'd be not too many revisions we don't know manifest of
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448 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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449 for (int i = 0; i < changelog2manifest.length; i++) {
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450 if (changelog2manifest[i] == -1) {
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451 undefinedChangelogRevision.add(i);
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452 }
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453 }
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454 for (int u : undefinedChangelogRevision) {
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455 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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456 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
218
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457 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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458 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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459 }
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460 }
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461 }
2
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462 }