Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgManifest.java @ 259:ea0c0de86d0e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Avoid IAE when repository has removed tags. Do not duplicate pools that are already in ManifestParser
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 22:15:02 +0200
parents f39fb6b3cc76
children 3dcd3dd90c77
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 static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import java.io.ByteArrayOutputStream;
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22 import java.io.IOException;
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23 import java.util.ArrayList;
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24 import java.util.Arrays;
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26 import org.tmatesoft.hg.core.HgBadStateException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.internal.DataAccess;
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29 import org.tmatesoft.hg.internal.Experimental;
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30 import org.tmatesoft.hg.internal.Lifecycle;
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31 import org.tmatesoft.hg.internal.Pool;
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32 import org.tmatesoft.hg.internal.RevlogStream;
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33 import org.tmatesoft.hg.util.Path;
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36 /**
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class HgManifest extends Revlog {
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42 private RevisionMapper revisionMap;
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44 /*package-local*/ HgManifest(HgRepository hgRepo, RevlogStream content) {
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45 super(hgRepo, content);
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46 }
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47
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48 /**
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49 *
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50 * @param start changelog (not manifest!) revision to begin with
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51 * @param end changelog (not manifest!) revision to stop, inclusive.
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52 * @param inspector can't be <code>null</code>
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53 */
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54 public void walk(int start, int end, final Inspector inspector) {
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55 if (inspector == null) {
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56 throw new IllegalArgumentException();
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57 }
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58 int start0 = fromChangelog(start);
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59 int end0 = fromChangelog(end);
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60 content.iterate(start0, end0, true, new ManifestParser(inspector));
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61 }
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63 /**
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64 * "Sparse" iteration of the manifest
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65 *
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66 * @param inspector
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67 * @param localRevisions local changeset revisions to visit
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68 */
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69 public void walk(final Inspector inspector, int... localRevisions) {
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70 if (inspector == null || localRevisions == null) {
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71 throw new IllegalArgumentException();
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72 }
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73 int[] manifestLocalRevs = new int[localRevisions.length];
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74 boolean needsSort = false;
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75 for (int i = 0; i < localRevisions.length; i++) {
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76 final int manifestLocalRev = fromChangelog(localRevisions[i]);
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77 manifestLocalRevs[i] = manifestLocalRev;
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78 if (i > 0 && manifestLocalRevs[i-1] > manifestLocalRev) {
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79 needsSort = true;
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80 }
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81 }
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82 if (needsSort) {
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83 Arrays.sort(manifestLocalRevs);
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84 }
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85 content.iterate(manifestLocalRevs, true, new ManifestParser(inspector));
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86 }
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88 // manifest revision number that corresponds to the given changeset
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89 /*package-local*/ int fromChangelog(int revisionNumber) {
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90 if (HgInternals.wrongLocalRevision(revisionNumber)) {
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91 throw new IllegalArgumentException(String.valueOf(revisionNumber));
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92 }
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93 if (revisionNumber == HgRepository.WORKING_COPY || revisionNumber == HgRepository.BAD_REVISION) {
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94 throw new IllegalArgumentException("Can't use constants like WORKING_COPY or BAD_REVISION");
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95 }
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96 // revisionNumber == TIP is processed by RevisionMapper
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97 if (revisionMap == null) {
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98 revisionMap = new RevisionMapper(getRepo());
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99 content.iterate(0, TIP, false, revisionMap);
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100 }
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101 return revisionMap.at(revisionNumber);
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102 }
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104 /**
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105 * Extracts file revision as it was known at the time of given changeset.
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106 *
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107 * @param revisionNumber local changeset index
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108 * @param file path to file in question
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109 * @return file revision or <code>null</code> if manifest at specified revision doesn't list such file
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110 */
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111 @Experimental(reason="Perhaps, HgDataFile shall own this method")
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112 public Nodeid getFileRevision(int revisionNumber, final Path file) {
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113 int rev = fromChangelog(revisionNumber);
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114 final Nodeid[] rv = new Nodeid[] { null };
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115 content.iterate(rev, rev, true, new RevlogStream.Inspector() {
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116
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117 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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118 ByteArrayOutputStream bos = new ByteArrayOutputStream();
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119 try {
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120 byte b;
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121 while (!data.isEmpty() && (b = data.readByte()) != '\n') {
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122 if (b != 0) {
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123 bos.write(b);
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124 } else {
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125 String fname = new String(bos.toByteArray());
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126 bos.reset();
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127 if (file.toString().equals(fname)) {
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128 byte[] nid = new byte[40];
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129 data.readBytes(nid, 0, 40);
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130 rv[0] = Nodeid.fromAscii(nid, 0, 40);
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131 break;
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132 }
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133 // else skip to the end of line
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134 while (!data.isEmpty() && (b = data.readByte()) != '\n')
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135 ;
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136 }
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137 }
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138 } catch (IOException ex) {
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139 throw new HgBadStateException(ex);
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140 }
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141 }
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142 });
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143 return rv[0];
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144 }
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145
19
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146 public interface Inspector {
222
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147 boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision);
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148 boolean next(Nodeid nid, String fname, String flags);
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149 boolean end(int manifestRevision);
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150 }
196
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151
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152 private static class ManifestParser implements RevlogStream.Inspector {
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153 private boolean gtg = true; // good to go
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154 private final Inspector inspector;
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155 private final Pool<Nodeid> nodeidPool;
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156 private final Pool<String> fnamePool;
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157 private final Pool<String> flagsPool;
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158
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159 public ManifestParser(Inspector delegate) {
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160 assert delegate != null;
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161 inspector = delegate;
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162 nodeidPool = new Pool<Nodeid>();
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163 fnamePool = new Pool<String>();
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164 flagsPool = new Pool<String>();
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165 }
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166
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167 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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168 if (!gtg) {
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169 return;
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170 }
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171 try {
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172 gtg = gtg && inspector.begin(revisionNumber, new Nodeid(nodeid, true), linkRevision);
196
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173 int i;
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174 String fname = null;
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175 String flags = null;
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176 Nodeid nid = null;
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177 byte[] data = da.byteArray();
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178 for (i = 0; gtg && i < actualLen; i++) {
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179 int x = i;
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180 for( ; data[i] != '\n' && i < actualLen; i++) {
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181 if (fname == null && data[i] == 0) {
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182 fname = fnamePool.unify(new String(data, x, i - x));
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183 x = i+1;
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184 }
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185 }
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186 if (i < actualLen) {
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187 assert data[i] == '\n';
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188 int nodeidLen = i - x < 40 ? i-x : 40;
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189 nid = nodeidPool.unify(Nodeid.fromAscii(data, x, nodeidLen));
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190 if (nodeidLen + x < i) {
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191 // 'x' and 'l' for executable bits and symlinks?
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192 // hg --debug manifest shows 644 for each regular file in my repo
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193 flags = flagsPool.unify(new String(data, x + nodeidLen, i-x-nodeidLen));
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194 }
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195 gtg = gtg && inspector.next(nid, fname, flags);
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196 }
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197 nid = null;
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198 fname = flags = null;
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199 }
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200 gtg = gtg && inspector.end(revisionNumber);
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201 } catch (IOException ex) {
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202 throw new HgBadStateException(ex);
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203 }
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204 }
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205 }
218
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206
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207 private static class RevisionMapper implements RevlogStream.Inspector, Lifecycle {
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208
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209 private final int changelogRevisions;
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210 private int[] changelog2manifest;
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211 private final HgRepository repo;
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212
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213 public RevisionMapper(HgRepository hgRepo) {
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214 repo = hgRepo;
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215 changelogRevisions = repo.getChangelog().getRevisionCount();
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216 }
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217
257
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218 // respects TIP
218
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219 public int at(int revisionNumber) {
257
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220 if (revisionNumber == TIP) {
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221 revisionNumber = changelogRevisions - 1;
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222 }
218
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223 if (changelog2manifest != null) {
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224 return changelog2manifest[revisionNumber];
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225 }
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226 return revisionNumber;
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227 }
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diff changeset
228
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229 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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230 if (changelog2manifest != null) {
220
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231 // next assertion is not an error, rather assumption check, which is too development-related to be explicit exception -
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232 // I just wonder if there are manifests that have two entries pointing to single changeset. It seems unrealistic, though -
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233 // changeset records one and only one manifest nodeid
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234 assert changelog2manifest[linkRevision] == -1 : String.format("revision:%d, link:%d, already linked to revision:%d", revisionNumber, linkRevision, changelog2manifest[linkRevision]);
218
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235 changelog2manifest[linkRevision] = revisionNumber;
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236 } else {
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237 if (revisionNumber != linkRevision) {
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238 changelog2manifest = new int[changelogRevisions];
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239 Arrays.fill(changelog2manifest, -1);
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240 for (int i = 0; i < revisionNumber; changelog2manifest[i] = i, i++)
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241 ;
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242 changelog2manifest[linkRevision] = revisionNumber;
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243 }
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244 }
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245 }
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246
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247 public void start(int count, Callback callback, Object token) {
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248 if (count != changelogRevisions) {
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249 assert count < changelogRevisions; // no idea what to do if manifest has more revisions than changelog
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250 // the way how manifest may contain more revisions than changelog, as I can imagine, is a result of
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251 // some kind of an import tool (e.g. from SVN or CVS), that creates manifest and changelog independently.
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252 // Note, it's pure guess, I didn't see such repository yet (although the way manifest revisions
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253 // in cpython repo are numbered makes me think aforementioned way)
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254 changelog2manifest = new int[changelogRevisions];
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255 Arrays.fill(changelog2manifest, -1);
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256 }
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257 }
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258
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259 public void finish(Object token) {
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260 if (changelog2manifest == null) {
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261 return;
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262 }
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263 // I assume there'd be not too many revisions we don't know manifest of
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264 ArrayList<Integer> undefinedChangelogRevision = new ArrayList<Integer>();
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265 for (int i = 0; i < changelog2manifest.length; i++) {
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266 if (changelog2manifest[i] == -1) {
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267 undefinedChangelogRevision.add(i);
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268 }
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269 }
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270 for (int u : undefinedChangelogRevision) {
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271 Nodeid manifest = repo.getChangelog().range(u, u).get(0).manifest();
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272 // FIXME calculate those missing effectively (e.g. cache and sort nodeids to speed lookup
218
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273 // right away in the #next (may refactor ParentWalker's sequential and sorted into dedicated helper and reuse here)
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274 changelog2manifest[u] = repo.getManifest().getLocalRevision(manifest);
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275 }
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278 }