annotate src/org/tmatesoft/hg/repo/HgChangelog.java @ 262:3dcd3dd90c77

Improve manifest parsing: decode bytes to chars once, minimize arraycopy on String instantiation, keep set of file revisions from previous manifest only
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 18 Aug 2011 03:46:36 +0200
parents a6d19adc2636
children f9f3e9b67ccc
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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
102
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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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68 /**
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69 * Access individual revisions. Note, regardless of supplied revision order, inspector gets
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70 * changesets strictly in the order they are in the changelog.
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71 * @param inspector callback to get changesets
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72 * @param revisions revisions to read, unrestricted ordering.
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73 */
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74 public void range(final HgChangelog.Inspector inspector, final int... revisions) {
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75 Arrays.sort(revisions);
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76 rangeInternal(inspector, revisions);
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77 }
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79 /**
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80 * Friends-only version of {@link #range(Inspector, int...)}, when callers know array is sorted
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81 */
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82 /*package-local*/ void rangeInternal(HgChangelog.Inspector inspector, int[] sortedRevisions) {
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83 if (sortedRevisions == null || sortedRevisions.length == 0) {
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84 return;
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85 }
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86 if (inspector == null) {
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87 throw new IllegalArgumentException();
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88 }
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89 content.iterate(sortedRevisions, true, new RawCsetParser(inspector));
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90 }
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91
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92 public RawChangeset changeset(Nodeid nid) {
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93 int x = getLocalRevision(nid);
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94 return range(x, x).get(0);
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95 }
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97 public interface Inspector {
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98 // TODO describe whether cset is new instance each time
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99 // describe what revisionNumber is when Inspector is used with HgBundle (BAD_REVISION or bundle's local order?)
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100 void next(int revisionNumber, Nodeid nodeid, RawChangeset cset);
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101 }
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102
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103 /**
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104 * Entry in the Changelog
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105 */
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106 public static class RawChangeset implements Cloneable /* for those that would like to keep a copy */{
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107 // TODO immutable
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108 private/* final */Nodeid manifest;
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109 private String user;
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110 private String comment;
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111 private List<String> files; // unmodifiable collection (otherwise #files() and implicit #clone() shall be revised)
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112 private Date time;
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113 private int timezone;
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114 // http://mercurial.selenic.com/wiki/PruningDeadBranches - Closing changesets can be identified by close=1 in the changeset's extra field.
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115 private Map<String, String> extras;
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116
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117 /**
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118 * @see mercurial/changelog.py:read()
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119 *
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120 * <pre>
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121 * format used:
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122 * nodeid\n : manifest node in ascii
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123 * user\n : user, no \n or \r allowed
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124 * time tz extra\n : date (time is int or float, timezone is int)
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125 * : extra is metadatas, encoded and separated by '\0'
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126 * : older versions ignore it
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127 * files\n\n : files modified by the cset, no \n or \r allowed
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128 * (.*) : comment (free text, ideally utf-8)
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129 *
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130 * changelog v0 doesn't use extra
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131 * </pre>
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132 */
154
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133 private RawChangeset() {
153
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134 }
129
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135
153
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136 public Nodeid manifest() {
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137 return manifest;
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138 }
129
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139
153
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140 public String user() {
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141 return user;
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142 }
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143
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144 public String comment() {
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145 return comment;
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146 }
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147
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148 public List<String> files() {
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149 return files;
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150 }
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151
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152 public Date date() {
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153 return time;
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154 }
211
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155
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156 /**
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157 * @return time zone value, as is, positive for Western Hemisphere.
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158 */
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159 public int timezone() {
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160 return timezone;
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161 }
153
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162
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163 public String dateString() {
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164 // XXX keep once formatted? Perhaps, there's faster way to set up calendar/time zone?
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165 StringBuilder sb = new StringBuilder(30);
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166 Formatter f = new Formatter(sb, Locale.US);
211
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167 TimeZone tz = TimeZone.getTimeZone(TimeZone.getAvailableIDs(timezone * 1000)[0]);
153
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168 // apparently timezone field records number of seconds time differs from UTC,
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169 // i.e. value to substract from time to get UTC time. Calendar seems to add
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170 // timezone offset to UTC, instead, hence sign change.
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171 // tz.setRawOffset(timezone * -1000);
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172 Calendar c = Calendar.getInstance(tz, Locale.US);
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173 c.setTime(time);
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174 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c);
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175 return sb.toString();
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176 }
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177
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178 public Map<String, String> extras() {
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179 return extras;
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180 }
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181
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182 public String branch() {
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183 return extras.get("branch");
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184 }
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185
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186 @Override
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187 public String toString() {
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188 StringBuilder sb = new StringBuilder();
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189 sb.append("Changeset {");
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190 sb.append("User: ").append(user).append(", ");
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191 sb.append("Comment: ").append(comment).append(", ");
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192 sb.append("Manifest: ").append(manifest).append(", ");
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193 sb.append("Date: ").append(time).append(", ");
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194 sb.append("Files: ").append(files.size());
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195 for (String s : files) {
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196 sb.append(", ").append(s);
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197 }
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198 if (extras != null) {
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199 sb.append(", Extra: ").append(extras);
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200 }
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201 sb.append("}");
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202 return sb.toString();
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203 }
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204
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205 @Override
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206 public RawChangeset clone() {
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207 try {
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208 return (RawChangeset) super.clone();
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209 } catch (CloneNotSupportedException ex) {
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210 throw new InternalError(ex.toString());
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211 }
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212 }
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213
157
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214 public static RawChangeset parse(DataAccess da) {
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215 try {
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216 byte[] data = da.byteArray();
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217 RawChangeset rv = new RawChangeset();
196
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218 rv.init(data, 0, data.length, null);
157
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219 return rv;
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220 } catch (IOException ex) {
196
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221 throw new HgBadStateException(ex); // FIXME "Error reading changeset data"
157
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222 }
153
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223 }
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224
196
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225 // @param usersPool - it's likely user names get repeated again and again throughout repository. can be null
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226 /* package-local */void init(byte[] data, int offset, int length, Pool<String> usersPool) {
153
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227 final int bufferEndIndex = offset + length;
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228 final byte lineBreak = (byte) '\n';
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229 int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex);
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230 if (breakIndex1 == -1) {
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231 throw new IllegalArgumentException("Bad Changeset data");
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232 }
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233 Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1);
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234 int breakIndex2 = indexOf(data, lineBreak, breakIndex1 + 1, bufferEndIndex);
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235 if (breakIndex2 == -1) {
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236 throw new IllegalArgumentException("Bad Changeset data");
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237 }
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238 String _user = new String(data, breakIndex1 + 1, breakIndex2 - breakIndex1 - 1);
196
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239 if (usersPool != null) {
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240 _user = usersPool.unify(_user);
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241 }
153
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242 int breakIndex3 = indexOf(data, lineBreak, breakIndex2 + 1, bufferEndIndex);
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243 if (breakIndex3 == -1) {
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244 throw new IllegalArgumentException("Bad Changeset data");
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245 }
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246 String _timeString = new String(data, breakIndex2 + 1, breakIndex3 - breakIndex2 - 1);
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247 int space1 = _timeString.indexOf(' ');
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248 if (space1 == -1) {
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249 throw new IllegalArgumentException("Bad Changeset data");
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250 }
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251 int space2 = _timeString.indexOf(' ', space1 + 1);
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252 if (space2 == -1) {
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253 space2 = _timeString.length();
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254 }
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255 long unixTime = Long.parseLong(_timeString.substring(0, space1)); // XXX Float, perhaps
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256 int _timezone = Integer.parseInt(_timeString.substring(space1 + 1, space2));
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257 // 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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258 // on commit and timezone is recorded to adjust it to UTC.
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259 Date _time = new Date(unixTime * 1000);
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260 String _extras = space2 < _timeString.length() ? _timeString.substring(space2 + 1) : null;
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261 Map<String, String> _extrasMap;
252
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262 final String extras_branch_key = "branch";
153
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263 if (_extras == null) {
252
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264 _extrasMap = Collections.singletonMap(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
153
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265 } else {
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266 _extrasMap = new HashMap<String, String>();
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267 for (String pair : _extras.split("\00")) {
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268 int eq = pair.indexOf(':');
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269 // FIXME need to decode key/value, @see changelog.py:decodeextra
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270 _extrasMap.put(pair.substring(0, eq), pair.substring(eq + 1));
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271 }
252
a6d19adc2636 HgRepository.getWorkingCopyBranchName() to retrieve branch associated with working directory
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272 if (!_extrasMap.containsKey(extras_branch_key)) {
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273 _extrasMap.put(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
153
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274 }
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275 _extrasMap = Collections.unmodifiableMap(_extrasMap);
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276 }
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277
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278 //
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279 int lastStart = breakIndex3 + 1;
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280 int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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281 ArrayList<String> _files = null;
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282 if (breakIndex4 > lastStart) {
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283 // if breakIndex4 == lastStart, we already found \n\n and hence there are no files (e.g. merge revision)
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284 _files = new ArrayList<String>(5);
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285 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
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286 _files.add(new String(data, lastStart, breakIndex4 - lastStart));
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287 lastStart = breakIndex4 + 1;
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288 if (data[breakIndex4 + 1] == lineBreak) {
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289 // found \n\n
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290 break;
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291 } else {
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292 breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
129
645829962785 core.Cset renamed to HgChangeset; repo.Changeset moved into HgChangelog
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293 }
153
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294 }
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295 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
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296 throw new IllegalArgumentException("Bad Changeset data");
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297 }
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298 } else {
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299 breakIndex4--;
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300 }
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301 String _comment;
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302 try {
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303 _comment = new String(data, breakIndex4 + 2, bufferEndIndex - breakIndex4 - 2, "UTF-8");
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304 // FIXME respect ui.fallbackencoding and try to decode if set
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305 } catch (UnsupportedEncodingException ex) {
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306 _comment = "";
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307 throw new IllegalStateException("Could hardly happen");
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308 }
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309 // change this instance at once, don't leave it partially changes in case of error
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310 this.manifest = _nodeid;
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311 this.user = _user;
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312 this.time = _time;
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313 this.timezone = _timezone;
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314 this.files = _files == null ? Collections.<String> emptyList() : Collections.unmodifiableList(_files);
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315 this.comment = _comment;
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316 this.extras = _extrasMap;
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317 }
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645829962785 core.Cset renamed to HgChangeset; repo.Changeset moved into HgChangelog
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318
153
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319 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
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320 for (int i = startOffset; i < endIndex; i++) {
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321 if (src[i] == what) {
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322 return i;
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323 }
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324 }
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325 return -1;
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326 }
129
645829962785 core.Cset renamed to HgChangeset; repo.Changeset moved into HgChangelog
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327 }
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328
196
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329 private static class RawCsetCollector implements Inspector {
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330 final ArrayList<RawChangeset> result;
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331
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332 public RawCsetCollector(int count) {
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333 result = new ArrayList<RawChangeset>(count > 0 ? count : 5);
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334 }
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335
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336 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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337 result.add(cset.clone());
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338 }
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339 }
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340
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341 private static class RawCsetParser implements RevlogStream.Inspector {
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342
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343 private final Inspector inspector;
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344 private final Pool<String> usersPool;
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345 private final RawChangeset cset = new RawChangeset();
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346
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347 public RawCsetParser(HgChangelog.Inspector delegate) {
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348 assert delegate != null;
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349 inspector = delegate;
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350 usersPool = new Pool<String>();
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351 }
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352
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353 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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354 try {
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355 byte[] data = da.byteArray();
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356 cset.init(data, 0, data.length, usersPool);
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357 // XXX there's no guarantee for Changeset.Callback that distinct instance comes each time, consider instance reuse
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358 inspector.next(revisionNumber, Nodeid.fromBinary(nodeid, 0), cset);
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359 } catch (Exception ex) {
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360 throw new HgBadStateException(ex); // FIXME exception handling
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361 }
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362 }
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363 }
0
dbd663faec1f Basic changelog parsing
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diff changeset
364 }