Mercurial > jhg
annotate src/org/tmatesoft/hg/repo/HgChangelog.java @ 258:e5776067b3b8
Reduce number of objects instantiated on revlog read
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
|---|---|
| date | Tue, 16 Aug 2011 22:08:15 +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 |
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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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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.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) |
| 153 | 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 |
| 153 | 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 /** |
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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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78 |
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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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96 |
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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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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; |
| 153 | 109 private String user; |
| 110 private String comment; | |
| 111 private List<String> files; // unmodifiable collection (otherwise #files() and implicit #clone() shall be revised) | |
| 112 private Date time; | |
| 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. |
| 153 | 115 private Map<String, String> extras; |
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116 |
| 153 | 117 /** |
| 118 * @see mercurial/changelog.py:read() | |
| 119 * | |
| 120 * <pre> | |
| 121 * format used: | |
| 122 * nodeid\n : manifest node in ascii | |
| 123 * user\n : user, no \n or \r allowed | |
| 124 * time tz extra\n : date (time is int or float, timezone is int) | |
| 125 * : extra is metadatas, encoded and separated by '\0' | |
| 126 * : older versions ignore it | |
| 127 * files\n\n : files modified by the cset, no \n or \r allowed | |
| 128 * (.*) : comment (free text, ideally utf-8) | |
| 129 * | |
| 130 * changelog v0 doesn't use extra | |
| 131 * </pre> | |
| 132 */ | |
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133 private RawChangeset() { |
| 153 | 134 } |
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135 |
| 153 | 136 public Nodeid manifest() { |
| 137 return manifest; | |
| 138 } | |
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139 |
| 153 | 140 public String user() { |
| 141 return user; | |
| 142 } | |
| 143 | |
| 144 public String comment() { | |
| 145 return comment; | |
| 146 } | |
| 147 | |
| 148 public List<String> files() { | |
| 149 return files; | |
| 150 } | |
| 151 | |
| 152 public Date date() { | |
| 153 return time; | |
| 154 } | |
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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 | 162 |
| 163 public String dateString() { | |
| 164 // XXX keep once formatted? Perhaps, there's faster way to set up calendar/time zone? | |
| 165 StringBuilder sb = new StringBuilder(30); | |
| 166 Formatter f = new Formatter(sb, Locale.US); | |
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167 TimeZone tz = TimeZone.getTimeZone(TimeZone.getAvailableIDs(timezone * 1000)[0]); |
| 153 | 168 // apparently timezone field records number of seconds time differs from UTC, |
| 169 // i.e. value to substract from time to get UTC time. Calendar seems to add | |
| 170 // timezone offset to UTC, instead, hence sign change. | |
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171 // tz.setRawOffset(timezone * -1000); |
| 153 | 172 Calendar c = Calendar.getInstance(tz, Locale.US); |
| 173 c.setTime(time); | |
| 174 f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", c); | |
| 175 return sb.toString(); | |
| 176 } | |
| 177 | |
| 178 public Map<String, String> extras() { | |
| 179 return extras; | |
| 180 } | |
| 181 | |
| 182 public String branch() { | |
| 183 return extras.get("branch"); | |
| 184 } | |
| 185 | |
| 186 @Override | |
| 187 public String toString() { | |
| 188 StringBuilder sb = new StringBuilder(); | |
| 189 sb.append("Changeset {"); | |
| 190 sb.append("User: ").append(user).append(", "); | |
| 191 sb.append("Comment: ").append(comment).append(", "); | |
| 192 sb.append("Manifest: ").append(manifest).append(", "); | |
| 193 sb.append("Date: ").append(time).append(", "); | |
| 194 sb.append("Files: ").append(files.size()); | |
| 195 for (String s : files) { | |
| 196 sb.append(", ").append(s); | |
| 197 } | |
| 198 if (extras != null) { | |
| 199 sb.append(", Extra: ").append(extras); | |
| 200 } | |
| 201 sb.append("}"); | |
| 202 return sb.toString(); | |
| 203 } | |
| 204 | |
| 205 @Override | |
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206 public RawChangeset clone() { |
| 153 | 207 try { |
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208 return (RawChangeset) super.clone(); |
| 153 | 209 } catch (CloneNotSupportedException ex) { |
| 210 throw new InternalError(ex.toString()); | |
| 211 } | |
| 212 } | |
| 213 | |
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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(); |
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218 rv.init(data, 0, data.length, null); |
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219 return rv; |
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220 } catch (IOException ex) { |
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221 throw new HgBadStateException(ex); // FIXME "Error reading changeset data" |
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222 } |
| 153 | 223 } |
| 224 | |
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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 | 227 final int bufferEndIndex = offset + length; |
| 228 final byte lineBreak = (byte) '\n'; | |
| 229 int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex); | |
| 230 if (breakIndex1 == -1) { | |
| 231 throw new IllegalArgumentException("Bad Changeset data"); | |
| 232 } | |
| 233 Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1); | |
| 234 int breakIndex2 = indexOf(data, lineBreak, breakIndex1 + 1, bufferEndIndex); | |
| 235 if (breakIndex2 == -1) { | |
| 236 throw new IllegalArgumentException("Bad Changeset data"); | |
| 237 } | |
| 238 String _user = new String(data, breakIndex1 + 1, breakIndex2 - breakIndex1 - 1); | |
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239 if (usersPool != null) { |
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240 _user = usersPool.unify(_user); |
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241 } |
| 153 | 242 int breakIndex3 = indexOf(data, lineBreak, breakIndex2 + 1, bufferEndIndex); |
| 243 if (breakIndex3 == -1) { | |
| 244 throw new IllegalArgumentException("Bad Changeset data"); | |
| 245 } | |
| 246 String _timeString = new String(data, breakIndex2 + 1, breakIndex3 - breakIndex2 - 1); | |
| 247 int space1 = _timeString.indexOf(' '); | |
| 248 if (space1 == -1) { | |
| 249 throw new IllegalArgumentException("Bad Changeset data"); | |
| 250 } | |
| 251 int space2 = _timeString.indexOf(' ', space1 + 1); | |
| 252 if (space2 == -1) { | |
| 253 space2 = _timeString.length(); | |
| 254 } | |
| 255 long unixTime = Long.parseLong(_timeString.substring(0, space1)); // XXX Float, perhaps | |
| 256 int _timezone = Integer.parseInt(_timeString.substring(space1 + 1, space2)); | |
| 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 | |
| 258 // on commit and timezone is recorded to adjust it to UTC. | |
| 259 Date _time = new Date(unixTime * 1000); | |
| 260 String _extras = space2 < _timeString.length() ? _timeString.substring(space2 + 1) : null; | |
| 261 Map<String, String> _extrasMap; | |
|
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262 final String extras_branch_key = "branch"; |
| 153 | 263 if (_extras == null) { |
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264 _extrasMap = Collections.singletonMap(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME); |
| 153 | 265 } else { |
| 266 _extrasMap = new HashMap<String, String>(); | |
| 267 for (String pair : _extras.split("\00")) { | |
| 268 int eq = pair.indexOf(':'); | |
| 269 // FIXME need to decode key/value, @see changelog.py:decodeextra | |
| 270 _extrasMap.put(pair.substring(0, eq), pair.substring(eq + 1)); | |
| 271 } | |
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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 | 274 } |
| 275 _extrasMap = Collections.unmodifiableMap(_extrasMap); | |
| 276 } | |
| 277 | |
| 278 // | |
| 279 int lastStart = breakIndex3 + 1; | |
| 280 int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex); | |
| 281 ArrayList<String> _files = null; | |
| 282 if (breakIndex4 > lastStart) { | |
| 283 // if breakIndex4 == lastStart, we already found \n\n and hence there are no files (e.g. merge revision) | |
| 284 _files = new ArrayList<String>(5); | |
| 285 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) { | |
| 286 _files.add(new String(data, lastStart, breakIndex4 - lastStart)); | |
| 287 lastStart = breakIndex4 + 1; | |
| 288 if (data[breakIndex4 + 1] == lineBreak) { | |
| 289 // found \n\n | |
| 290 break; | |
| 291 } else { | |
| 292 breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex); | |
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293 } |
| 153 | 294 } |
| 295 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) { | |
| 296 throw new IllegalArgumentException("Bad Changeset data"); | |
| 297 } | |
| 298 } else { | |
| 299 breakIndex4--; | |
| 300 } | |
| 301 String _comment; | |
| 302 try { | |
| 303 _comment = new String(data, breakIndex4 + 2, bufferEndIndex - breakIndex4 - 2, "UTF-8"); | |
| 304 // FIXME respect ui.fallbackencoding and try to decode if set | |
| 305 } catch (UnsupportedEncodingException ex) { | |
| 306 _comment = ""; | |
| 307 throw new IllegalStateException("Could hardly happen"); | |
| 308 } | |
| 309 // change this instance at once, don't leave it partially changes in case of error | |
| 310 this.manifest = _nodeid; | |
| 311 this.user = _user; | |
| 312 this.time = _time; | |
| 313 this.timezone = _timezone; | |
| 314 this.files = _files == null ? Collections.<String> emptyList() : Collections.unmodifiableList(_files); | |
| 315 this.comment = _comment; | |
| 316 this.extras = _extrasMap; | |
| 317 } | |
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318 |
| 153 | 319 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) { |
| 320 for (int i = startOffset; i < endIndex; i++) { | |
| 321 if (src[i] == what) { | |
| 322 return i; | |
| 323 } | |
| 324 } | |
| 325 return -1; | |
| 326 } | |
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327 } |
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328 |
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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 } |
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364 } |