Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 317:09628675bcee

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Rework file history build approach to match rest of the API
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Sep 2011 03:20:28 +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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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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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
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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;
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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 }