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annotate src/org/tmatesoft/hg/repo/HgChangelog.java @ 312:f9f3e9b67ccc

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Facilitate cancellation and progress reporting in changelog and manifest iterations
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 27 Sep 2011 05:29:12 +0200
parents a6d19adc2636
children 09628675bcee
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 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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32
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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.IterateControlMediator;
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37 import org.tmatesoft.hg.internal.Lifecycle;
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38 import org.tmatesoft.hg.internal.Pool;
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39 import org.tmatesoft.hg.internal.RevlogStream;
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40 import org.tmatesoft.hg.util.CancelSupport;
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41 import org.tmatesoft.hg.util.ProgressSupport;
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42
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43 /**
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44 * Representation of the Mercurial changelog file (list of ChangeSets)
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45 *
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46 * @author Artem Tikhomirov
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47 * @author TMate Software Ltd.
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48 */
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49 public class HgChangelog extends Revlog {
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50
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51 /* package-local */HgChangelog(HgRepository hgRepo, RevlogStream content) {
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52 super(hgRepo, content);
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53 }
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54
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55 public void all(final HgChangelog.Inspector inspector) {
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56 range(0, getLastRevision(), inspector);
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57 }
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58
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59 public void range(int start, int end, final HgChangelog.Inspector inspector) {
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60 if (inspector == null) {
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61 throw new IllegalArgumentException();
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62 }
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63 content.iterate(start, end, true, new RawCsetParser(inspector));
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64 }
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65
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66 public List<RawChangeset> range(int start, int end) {
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67 final RawCsetCollector c = new RawCsetCollector(end - start + 1);
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68 range(start, end, c);
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69 return c.result;
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70 }
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71
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72 /**
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73 * Access individual revisions. Note, regardless of supplied revision order, inspector gets
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74 * changesets strictly in the order they are in the changelog.
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75 * @param inspector callback to get changesets
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76 * @param revisions revisions to read, unrestricted ordering.
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77 */
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78 public void range(final HgChangelog.Inspector inspector, final int... revisions) {
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79 Arrays.sort(revisions);
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80 rangeInternal(inspector, revisions);
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81 }
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83 /**
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84 * Friends-only version of {@link #range(Inspector, int...)}, when callers know array is sorted
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85 */
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86 /*package-local*/ void rangeInternal(HgChangelog.Inspector inspector, int[] sortedRevisions) {
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87 if (sortedRevisions == null || sortedRevisions.length == 0) {
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88 return;
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89 }
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90 if (inspector == null) {
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91 throw new IllegalArgumentException();
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92 }
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93 content.iterate(sortedRevisions, true, new RawCsetParser(inspector));
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94 }
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95
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96 public RawChangeset changeset(Nodeid nid) {
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97 int x = getLocalRevision(nid);
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98 return range(x, x).get(0);
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99 }
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100
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101 public interface Inspector {
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102 // TODO describe whether cset is new instance each time
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103 // describe what revisionNumber is when Inspector is used with HgBundle (BAD_REVISION or bundle's local order?)
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104 void next(int revisionNumber, Nodeid nodeid, RawChangeset cset);
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105 }
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106
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107 /**
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108 * Entry in the Changelog
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109 */
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110 public static class RawChangeset implements Cloneable /* for those that would like to keep a copy */{
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111 // TODO immutable
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112 private/* final */Nodeid manifest;
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113 private String user;
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114 private String comment;
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115 private List<String> files; // unmodifiable collection (otherwise #files() and implicit #clone() shall be revised)
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116 private Date time;
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117 private int timezone;
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118 // http://mercurial.selenic.com/wiki/PruningDeadBranches - Closing changesets can be identified by close=1 in the changeset's extra field.
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119 private Map<String, String> extras;
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120
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121 /**
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122 * @see mercurial/changelog.py:read()
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123 *
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124 * <pre>
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125 * format used:
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126 * nodeid\n : manifest node in ascii
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127 * user\n : user, no \n or \r allowed
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128 * time tz extra\n : date (time is int or float, timezone is int)
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129 * : extra is metadatas, encoded and separated by '\0'
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130 * : older versions ignore it
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131 * files\n\n : files modified by the cset, no \n or \r allowed
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132 * (.*) : comment (free text, ideally utf-8)
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133 *
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134 * changelog v0 doesn't use extra
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135 * </pre>
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136 */
154
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137 private RawChangeset() {
153
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138 }
129
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139
153
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140 public Nodeid manifest() {
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141 return manifest;
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142 }
129
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143
153
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144 public String user() {
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145 return user;
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146 }
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147
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148 public String comment() {
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149 return comment;
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150 }
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151
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152 public List<String> files() {
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153 return files;
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154 }
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155
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156 public Date date() {
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157 return time;
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158 }
211
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159
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160 /**
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161 * @return time zone value, as is, positive for Western Hemisphere.
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162 */
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163 public int timezone() {
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164 return timezone;
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165 }
153
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166
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167 public String dateString() {
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168 // XXX keep once formatted? Perhaps, there's faster way to set up calendar/time zone?
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169 StringBuilder sb = new StringBuilder(30);
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170 Formatter f = new Formatter(sb, Locale.US);
211
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171 TimeZone tz = TimeZone.getTimeZone(TimeZone.getAvailableIDs(timezone * 1000)[0]);
153
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172 // apparently timezone field records number of seconds time differs from UTC,
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173 // i.e. value to substract from time to get UTC time. Calendar seems to add
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174 // timezone offset to UTC, instead, hence sign change.
211
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175 // tz.setRawOffset(timezone * -1000);
153
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176 Calendar c = Calendar.getInstance(tz, Locale.US);
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177 c.setTime(time);
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178 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c);
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179 return sb.toString();
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180 }
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181
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182 public Map<String, String> extras() {
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183 return extras;
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184 }
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185
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186 public String branch() {
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187 return extras.get("branch");
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188 }
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189
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190 @Override
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191 public String toString() {
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192 StringBuilder sb = new StringBuilder();
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193 sb.append("Changeset {");
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194 sb.append("User: ").append(user).append(", ");
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195 sb.append("Comment: ").append(comment).append(", ");
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196 sb.append("Manifest: ").append(manifest).append(", ");
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197 sb.append("Date: ").append(time).append(", ");
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198 sb.append("Files: ").append(files.size());
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199 for (String s : files) {
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200 sb.append(", ").append(s);
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201 }
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202 if (extras != null) {
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203 sb.append(", Extra: ").append(extras);
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204 }
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205 sb.append("}");
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206 return sb.toString();
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207 }
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208
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209 @Override
154
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210 public RawChangeset clone() {
153
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211 try {
154
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212 return (RawChangeset) super.clone();
153
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213 } catch (CloneNotSupportedException ex) {
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214 throw new InternalError(ex.toString());
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215 }
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216 }
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217
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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218 public static RawChangeset parse(DataAccess da) {
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219 try {
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220 byte[] data = da.byteArray();
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221 RawChangeset rv = new RawChangeset();
196
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222 rv.init(data, 0, data.length, null);
157
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223 return rv;
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224 } catch (IOException ex) {
196
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225 throw new HgBadStateException(ex); // FIXME "Error reading changeset data"
157
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226 }
153
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227 }
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228
196
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229 // @param usersPool - it's likely user names get repeated again and again throughout repository. can be null
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230 /* package-local */void init(byte[] data, int offset, int length, Pool<String> usersPool) {
153
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231 final int bufferEndIndex = offset + length;
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232 final byte lineBreak = (byte) '\n';
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233 int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex);
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234 if (breakIndex1 == -1) {
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235 throw new IllegalArgumentException("Bad Changeset data");
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236 }
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237 Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1);
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238 int breakIndex2 = indexOf(data, lineBreak, breakIndex1 + 1, bufferEndIndex);
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239 if (breakIndex2 == -1) {
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240 throw new IllegalArgumentException("Bad Changeset data");
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241 }
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242 String _user = new String(data, breakIndex1 + 1, breakIndex2 - breakIndex1 - 1);
196
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243 if (usersPool != null) {
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diff changeset
244 _user = usersPool.unify(_user);
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245 }
153
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246 int breakIndex3 = indexOf(data, lineBreak, breakIndex2 + 1, bufferEndIndex);
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247 if (breakIndex3 == -1) {
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248 throw new IllegalArgumentException("Bad Changeset data");
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249 }
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250 String _timeString = new String(data, breakIndex2 + 1, breakIndex3 - breakIndex2 - 1);
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251 int space1 = _timeString.indexOf(' ');
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252 if (space1 == -1) {
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253 throw new IllegalArgumentException("Bad Changeset data");
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254 }
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255 int space2 = _timeString.indexOf(' ', space1 + 1);
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256 if (space2 == -1) {
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257 space2 = _timeString.length();
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258 }
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259 long unixTime = Long.parseLong(_timeString.substring(0, space1)); // XXX Float, perhaps
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260 int _timezone = Integer.parseInt(_timeString.substring(space1 + 1, space2));
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diff changeset
261 // 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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262 // on commit and timezone is recorded to adjust it to UTC.
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263 Date _time = new Date(unixTime * 1000);
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diff changeset
264 String _extras = space2 < _timeString.length() ? _timeString.substring(space2 + 1) : null;
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265 Map<String, String> _extrasMap;
252
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266 final String extras_branch_key = "branch";
153
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267 if (_extras == null) {
252
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268 _extrasMap = Collections.singletonMap(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
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269 } else {
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270 _extrasMap = new HashMap<String, String>();
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271 for (String pair : _extras.split("\00")) {
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272 int eq = pair.indexOf(':');
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273 // FIXME need to decode key/value, @see changelog.py:decodeextra
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274 _extrasMap.put(pair.substring(0, eq), pair.substring(eq + 1));
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275 }
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276 if (!_extrasMap.containsKey(extras_branch_key)) {
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277 _extrasMap.put(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
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278 }
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279 _extrasMap = Collections.unmodifiableMap(_extrasMap);
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280 }
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281
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282 //
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283 int lastStart = breakIndex3 + 1;
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284 int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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285 ArrayList<String> _files = null;
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286 if (breakIndex4 > lastStart) {
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287 // if breakIndex4 == lastStart, we already found \n\n and hence there are no files (e.g. merge revision)
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288 _files = new ArrayList<String>(5);
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289 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
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290 _files.add(new String(data, lastStart, breakIndex4 - lastStart));
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291 lastStart = breakIndex4 + 1;
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292 if (data[breakIndex4 + 1] == lineBreak) {
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293 // found \n\n
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294 break;
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295 } else {
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296 breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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297 }
153
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298 }
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299 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
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300 throw new IllegalArgumentException("Bad Changeset data");
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301 }
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302 } else {
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303 breakIndex4--;
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304 }
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305 String _comment;
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306 try {
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307 _comment = new String(data, breakIndex4 + 2, bufferEndIndex - breakIndex4 - 2, "UTF-8");
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308 // FIXME respect ui.fallbackencoding and try to decode if set
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309 } catch (UnsupportedEncodingException ex) {
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310 _comment = "";
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311 throw new IllegalStateException("Could hardly happen");
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312 }
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313 // change this instance at once, don't leave it partially changes in case of error
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314 this.manifest = _nodeid;
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315 this.user = _user;
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316 this.time = _time;
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317 this.timezone = _timezone;
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318 this.files = _files == null ? Collections.<String> emptyList() : Collections.unmodifiableList(_files);
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319 this.comment = _comment;
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320 this.extras = _extrasMap;
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321 }
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322
153
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323 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
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324 for (int i = startOffset; i < endIndex; i++) {
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325 if (src[i] == what) {
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326 return i;
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327 }
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328 }
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329 return -1;
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330 }
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331 }
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332
196
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333 private static class RawCsetCollector implements Inspector {
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334 final ArrayList<RawChangeset> result;
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335
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336 public RawCsetCollector(int count) {
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337 result = new ArrayList<RawChangeset>(count > 0 ? count : 5);
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338 }
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339
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340 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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341 result.add(cset.clone());
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342 }
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343 }
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344
312
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345 private static class RawCsetParser implements RevlogStream.Inspector, Lifecycle {
196
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346
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347 private final Inspector inspector;
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348 private final Pool<String> usersPool;
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349 private final RawChangeset cset = new RawChangeset();
312
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350 private final ProgressSupport progressHelper;
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351 private IterateControlMediator iterateControl;
196
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352
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353 public RawCsetParser(HgChangelog.Inspector delegate) {
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354 assert delegate != null;
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355 inspector = delegate;
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356 usersPool = new Pool<String>();
312
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357 progressHelper = ProgressSupport.Factory.get(delegate);
196
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358 }
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359
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360 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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361 try {
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362 byte[] data = da.byteArray();
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363 cset.init(data, 0, data.length, usersPool);
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364 // XXX there's no guarantee for Changeset.Callback that distinct instance comes each time, consider instance reuse
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365 inspector.next(revisionNumber, Nodeid.fromBinary(nodeid, 0), cset);
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366 progressHelper.worked(1);
196
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367 } catch (Exception ex) {
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368 throw new HgBadStateException(ex); // FIXME exception handling
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369 }
312
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370 if (iterateControl != null) {
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371 iterateControl.checkCancelled();
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372 }
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373 }
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374
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375 public void start(int count, Callback callback, Object token) {
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376 CancelSupport cs = CancelSupport.Factory.get(inspector, null);
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377 iterateControl = cs == null ? null : new IterateControlMediator(cs, callback);
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378 progressHelper.start(count);
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379 }
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380
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381 public void finish(Object token) {
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382 progressHelper.done();
196
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383 }
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384 }
0
dbd663faec1f Basic changelog parsing
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385 }