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

Optimize file history walk not to iterat over whole changelog for sparse and distant revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 Jun 2011 04:50:09 +0200
parents 644ee58c9f16
children 883300108179
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import java.io.IOException;
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20 import java.io.UnsupportedEncodingException;
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.Calendar;
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24 import java.util.Collections;
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25 import java.util.Date;
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26 import java.util.Formatter;
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27 import java.util.HashMap;
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28 import java.util.List;
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29 import java.util.Locale;
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30 import java.util.Map;
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31 import java.util.TimeZone;
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33 import org.tmatesoft.hg.core.HgBadStateException;
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34 import org.tmatesoft.hg.core.Nodeid;
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35 import org.tmatesoft.hg.internal.DataAccess;
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36 import org.tmatesoft.hg.internal.Pool;
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37 import org.tmatesoft.hg.internal.RevlogStream;
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38
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39 /**
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40 * Representation of the Mercurial changelog file (list of ChangeSets)
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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 HgChangelog extends Revlog {
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46
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47 /* package-local */HgChangelog(HgRepository hgRepo, RevlogStream content) {
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48 super(hgRepo, content);
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49 }
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50
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51 public void all(final HgChangelog.Inspector inspector) {
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52 range(0, getLastRevision(), inspector);
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53 }
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54
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55 public void range(int start, int end, final HgChangelog.Inspector inspector) {
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56 if (inspector == null) {
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57 throw new IllegalArgumentException();
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58 }
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59 content.iterate(start, end, true, new RawCsetParser(inspector));
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60 }
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61
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62 public List<RawChangeset> range(int start, int end) {
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63 final RawCsetCollector c = new RawCsetCollector(end - start + 1);
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64 range(start, end, c);
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65 return c.result;
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66 }
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67
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68 public void range(final HgChangelog.Inspector inspector, final int... revisions) {
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69 if (revisions == null || revisions.length == 0) {
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70 return;
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71 }
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72 RevlogStream.Inspector i = new RevlogStream.Inspector() {
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73 private final RawCsetParser delegate = new RawCsetParser(inspector);
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75 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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76 if (Arrays.binarySearch(revisions, revisionNumber) >= 0) {
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77 delegate.next(revisionNumber, actualLen, baseRevision, linkRevision, parent1Revision, parent2Revision, nodeid, da);
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78 }
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79 }
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80 };
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81 Arrays.sort(revisions);
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82 content.iterate(revisions[0], revisions[revisions.length - 1], true, i);
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83 }
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85 public interface Inspector {
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86 // TODO describe whether cset is new instance each time
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87 // describe what revisionNumber is when Inspector is used with HgBundle (BAD_REVISION or bundle's local order?)
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88 void next(int revisionNumber, Nodeid nodeid, RawChangeset cset);
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89 }
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91 /**
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92 * Entry in the Changelog
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93 */
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94 public static class RawChangeset implements Cloneable /* for those that would like to keep a copy */{
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95 // TODO immutable
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96 private/* final */Nodeid manifest;
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97 private String user;
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98 private String comment;
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99 private List<String> files; // unmodifiable collection (otherwise #files() and implicit #clone() shall be revised)
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100 private Date time;
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101 private int timezone;
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102 // http://mercurial.selenic.com/wiki/PruningDeadBranches - Closing changesets can be identified by close=1 in the changeset's extra field.
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103 private Map<String, String> extras;
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104
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105 /**
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106 * @see mercurial/changelog.py:read()
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107 *
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108 * <pre>
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109 * format used:
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110 * nodeid\n : manifest node in ascii
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111 * user\n : user, no \n or \r allowed
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112 * time tz extra\n : date (time is int or float, timezone is int)
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113 * : extra is metadatas, encoded and separated by '\0'
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114 * : older versions ignore it
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115 * files\n\n : files modified by the cset, no \n or \r allowed
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116 * (.*) : comment (free text, ideally utf-8)
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117 *
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118 * changelog v0 doesn't use extra
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119 * </pre>
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120 */
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121 private RawChangeset() {
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122 }
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123
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124 public Nodeid manifest() {
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125 return manifest;
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126 }
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127
153
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128 public String user() {
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129 return user;
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130 }
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131
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132 public String comment() {
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133 return comment;
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134 }
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135
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136 public List<String> files() {
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137 return files;
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138 }
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139
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140 public Date date() {
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141 return time;
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142 }
211
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143
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144 /**
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145 * @return time zone value, as is, positive for Western Hemisphere.
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146 */
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147 public int timezone() {
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148 return timezone;
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149 }
153
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150
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151 public String dateString() {
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152 // XXX keep once formatted? Perhaps, there's faster way to set up calendar/time zone?
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153 StringBuilder sb = new StringBuilder(30);
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154 Formatter f = new Formatter(sb, Locale.US);
211
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155 TimeZone tz = TimeZone.getTimeZone(TimeZone.getAvailableIDs(timezone * 1000)[0]);
153
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156 // apparently timezone field records number of seconds time differs from UTC,
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157 // i.e. value to substract from time to get UTC time. Calendar seems to add
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158 // timezone offset to UTC, instead, hence sign change.
211
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159 // tz.setRawOffset(timezone * -1000);
153
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160 Calendar c = Calendar.getInstance(tz, Locale.US);
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161 c.setTime(time);
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162 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c);
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163 return sb.toString();
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164 }
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165
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166 public Map<String, String> extras() {
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167 return extras;
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168 }
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169
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170 public String branch() {
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171 return extras.get("branch");
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172 }
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173
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174 @Override
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175 public String toString() {
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176 StringBuilder sb = new StringBuilder();
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177 sb.append("Changeset {");
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178 sb.append("User: ").append(user).append(", ");
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179 sb.append("Comment: ").append(comment).append(", ");
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180 sb.append("Manifest: ").append(manifest).append(", ");
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181 sb.append("Date: ").append(time).append(", ");
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182 sb.append("Files: ").append(files.size());
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183 for (String s : files) {
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184 sb.append(", ").append(s);
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185 }
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186 if (extras != null) {
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187 sb.append(", Extra: ").append(extras);
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188 }
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189 sb.append("}");
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190 return sb.toString();
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191 }
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192
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193 @Override
154
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194 public RawChangeset clone() {
153
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195 try {
154
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196 return (RawChangeset) super.clone();
153
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197 } catch (CloneNotSupportedException ex) {
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198 throw new InternalError(ex.toString());
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199 }
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200 }
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201
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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202 public static RawChangeset parse(DataAccess da) {
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203 try {
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204 byte[] data = da.byteArray();
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205 RawChangeset rv = new RawChangeset();
196
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206 rv.init(data, 0, data.length, null);
157
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207 return rv;
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208 } catch (IOException ex) {
196
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209 throw new HgBadStateException(ex); // FIXME "Error reading changeset data"
157
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210 }
153
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211 }
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212
196
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213 // @param usersPool - it's likely user names get repeated again and again throughout repository. can be null
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214 /* package-local */void init(byte[] data, int offset, int length, Pool<String> usersPool) {
153
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215 final int bufferEndIndex = offset + length;
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216 final byte lineBreak = (byte) '\n';
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217 int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex);
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218 if (breakIndex1 == -1) {
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219 throw new IllegalArgumentException("Bad Changeset data");
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220 }
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221 Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1);
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222 int breakIndex2 = indexOf(data, lineBreak, breakIndex1 + 1, bufferEndIndex);
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223 if (breakIndex2 == -1) {
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224 throw new IllegalArgumentException("Bad Changeset data");
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225 }
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226 String _user = new String(data, breakIndex1 + 1, breakIndex2 - breakIndex1 - 1);
196
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diff changeset
227 if (usersPool != null) {
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diff changeset
228 _user = usersPool.unify(_user);
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229 }
153
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230 int breakIndex3 = indexOf(data, lineBreak, breakIndex2 + 1, bufferEndIndex);
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231 if (breakIndex3 == -1) {
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232 throw new IllegalArgumentException("Bad Changeset data");
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233 }
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234 String _timeString = new String(data, breakIndex2 + 1, breakIndex3 - breakIndex2 - 1);
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235 int space1 = _timeString.indexOf(' ');
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236 if (space1 == -1) {
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237 throw new IllegalArgumentException("Bad Changeset data");
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238 }
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diff changeset
239 int space2 = _timeString.indexOf(' ', space1 + 1);
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diff changeset
240 if (space2 == -1) {
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241 space2 = _timeString.length();
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242 }
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diff changeset
243 long unixTime = Long.parseLong(_timeString.substring(0, space1)); // XXX Float, perhaps
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244 int _timezone = Integer.parseInt(_timeString.substring(space1 + 1, space2));
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diff changeset
245 // XXX not sure need to add timezone here - I can't figure out whether Hg keeps GMT time, and records timezone just for info, or unixTime is taken local
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diff changeset
246 // on commit and timezone is recorded to adjust it to UTC.
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diff changeset
247 Date _time = new Date(unixTime * 1000);
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248 String _extras = space2 < _timeString.length() ? _timeString.substring(space2 + 1) : null;
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249 Map<String, String> _extrasMap;
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diff changeset
250 if (_extras == null) {
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diff changeset
251 _extrasMap = Collections.singletonMap("branch", "default");
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diff changeset
252 } else {
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diff changeset
253 _extrasMap = new HashMap<String, String>();
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diff changeset
254 for (String pair : _extras.split("\00")) {
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diff changeset
255 int eq = pair.indexOf(':');
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256 // FIXME need to decode key/value, @see changelog.py:decodeextra
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257 _extrasMap.put(pair.substring(0, eq), pair.substring(eq + 1));
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258 }
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259 if (!_extrasMap.containsKey("branch")) {
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diff changeset
260 _extrasMap.put("branch", "default");
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261 }
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262 _extrasMap = Collections.unmodifiableMap(_extrasMap);
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263 }
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264
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diff changeset
265 //
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266 int lastStart = breakIndex3 + 1;
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267 int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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268 ArrayList<String> _files = null;
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269 if (breakIndex4 > lastStart) {
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270 // if breakIndex4 == lastStart, we already found \n\n and hence there are no files (e.g. merge revision)
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271 _files = new ArrayList<String>(5);
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272 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
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273 _files.add(new String(data, lastStart, breakIndex4 - lastStart));
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274 lastStart = breakIndex4 + 1;
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275 if (data[breakIndex4 + 1] == lineBreak) {
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276 // found \n\n
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277 break;
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278 } else {
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279 breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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280 }
153
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281 }
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282 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
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283 throw new IllegalArgumentException("Bad Changeset data");
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284 }
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285 } else {
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286 breakIndex4--;
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287 }
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288 String _comment;
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289 try {
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290 _comment = new String(data, breakIndex4 + 2, bufferEndIndex - breakIndex4 - 2, "UTF-8");
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291 // FIXME respect ui.fallbackencoding and try to decode if set
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292 } catch (UnsupportedEncodingException ex) {
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293 _comment = "";
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294 throw new IllegalStateException("Could hardly happen");
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295 }
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296 // change this instance at once, don't leave it partially changes in case of error
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297 this.manifest = _nodeid;
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298 this.user = _user;
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299 this.time = _time;
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300 this.timezone = _timezone;
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301 this.files = _files == null ? Collections.<String> emptyList() : Collections.unmodifiableList(_files);
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302 this.comment = _comment;
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303 this.extras = _extrasMap;
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304 }
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305
153
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306 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
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307 for (int i = startOffset; i < endIndex; i++) {
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308 if (src[i] == what) {
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309 return i;
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310 }
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311 }
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312 return -1;
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313 }
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314 }
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315
196
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316 private static class RawCsetCollector implements Inspector {
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317 final ArrayList<RawChangeset> result;
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318
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319 public RawCsetCollector(int count) {
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320 result = new ArrayList<RawChangeset>(count > 0 ? count : 5);
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321 }
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322
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323 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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324 result.add(cset.clone());
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325 }
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326 }
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327
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328 private static class RawCsetParser implements RevlogStream.Inspector {
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329
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330 private final Inspector inspector;
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331 private final Pool<String> usersPool;
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332 private final RawChangeset cset = new RawChangeset();
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333
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334 public RawCsetParser(HgChangelog.Inspector delegate) {
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335 assert delegate != null;
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336 inspector = delegate;
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337 usersPool = new Pool<String>();
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338 }
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339
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340 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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341 try {
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342 byte[] data = da.byteArray();
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343 cset.init(data, 0, data.length, usersPool);
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344 // XXX there's no guarantee for Changeset.Callback that distinct instance comes each time, consider instance reuse
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345 inspector.next(revisionNumber, Nodeid.fromBinary(nodeid, 0), cset);
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346 } catch (Exception ex) {
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347 throw new HgBadStateException(ex); // FIXME exception handling
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348 }
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349 }
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350 }
0
dbd663faec1f Basic changelog parsing
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351 }