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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 227:0fd10e5016dd

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IOException on empty repository with 40-byte dirstate
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 25 May 2011 13:13:36 +0200
parents 8248aae33f7d
children 1792b37650f2
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.util.Collections;
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22 import java.util.LinkedHashMap;
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23 import java.util.Map;
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24 import java.util.TreeSet;
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26 import org.tmatesoft.hg.internal.DataAccess;
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27 import org.tmatesoft.hg.internal.DataAccessProvider;
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28 import org.tmatesoft.hg.util.Path;
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29
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31 /**
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32 * @see http://mercurial.selenic.com/wiki/DirState
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33 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 class HgDirstate {
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39
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40 private final DataAccessProvider accessProvider;
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41 private final File dirstateFile;
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42 // deliberate String, not Path as it seems useless to keep Path here
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43 private Map<String, Record> normal;
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44 private Map<String, Record> added;
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45 private Map<String, Record> removed;
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46 private Map<String, Record> merged;
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47
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48 /*package-local*/ HgDirstate() {
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49 // empty instance
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50 accessProvider = null;
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51 dirstateFile = null;
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52 }
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54 public HgDirstate(DataAccessProvider dap, File dirstate) {
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55 accessProvider = dap;
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56 dirstateFile = dirstate;
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57 }
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58
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59 private void read() {
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60 normal = added = removed = merged = Collections.<String, Record>emptyMap();
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61 if (dirstateFile == null || !dirstateFile.exists()) {
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62 return;
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63 }
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64 DataAccess da = accessProvider.create(dirstateFile);
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65 if (da.isEmpty()) {
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66 return;
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67 }
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68 // not sure linked is really needed here, just for ease of debug
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69 normal = new LinkedHashMap<String, Record>();
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70 added = new LinkedHashMap<String, Record>();
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71 removed = new LinkedHashMap<String, Record>();
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72 merged = new LinkedHashMap<String, Record>();
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73 try {
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74 // XXX skip(40) if we don't need these?
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75 byte[] parents = new byte[40];
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76 da.readBytes(parents, 0, 40);
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77 parents = null;
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78 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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79 while (!da.isEmpty()) {
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80 final byte state = da.readByte();
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81 final int fmode = da.readInt();
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82 final int size = da.readInt();
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83 final int time = da.readInt();
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84 final int nameLen = da.readInt();
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85 String fn1 = null, fn2 = null;
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86 byte[] name = new byte[nameLen];
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87 da.readBytes(name, 0, nameLen);
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88 for (int i = 0; i < nameLen; i++) {
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89 if (name[i] == 0) {
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90 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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91 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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92 break;
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93 }
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94 }
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95 if (fn1 == null) {
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96 fn1 = new String(name);
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97 }
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98 Record r = new Record(fmode, size, time, fn1, fn2);
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99 if (state == 'n') {
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100 normal.put(r.name1, r);
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101 } else if (state == 'a') {
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102 added.put(r.name1, r);
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103 } else if (state == 'r') {
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104 removed.put(r.name1, r);
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105 } else if (state == 'm') {
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106 merged.put(r.name1, r);
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107 } else {
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108 // FIXME log error?
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109 }
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110 }
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111 } catch (IOException ex) {
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112 ex.printStackTrace(); // FIXME log error, clean dirstate?
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113 } finally {
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114 da.done();
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115 }
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116 }
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117
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118 // new, modifiable collection
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119 /*package-local*/ TreeSet<String> all() {
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120 read();
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121 TreeSet<String> rv = new TreeSet<String>();
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122 @SuppressWarnings("unchecked")
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123 Map<String, Record>[] all = new Map[] { normal, added, removed, merged };
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124 for (int i = 0; i < all.length; i++) {
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125 for (Record r : all[i].values()) {
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126 rv.add(r.name1);
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127 }
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128 }
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129 return rv;
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130 }
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131
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132 /*package-local*/ Record checkNormal(Path fname) {
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133 return normal.get(fname.toString());
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134 }
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135
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136 /*package-local*/ Record checkAdded(Path fname) {
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137 return added.get(fname.toString());
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138 }
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139 /*package-local*/ Record checkRemoved(Path fname) {
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140 return removed.get(fname.toString());
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141 }
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142 /*package-local*/ Record checkRemoved(String fname) {
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143 return removed.get(fname);
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144 }
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145 /*package-local*/ Record checkMerged(Path fname) {
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146 return merged.get(fname.toString());
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147 }
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148
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149
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150
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151
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152 /*package-local*/ void dump() {
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153 read();
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154 @SuppressWarnings("unchecked")
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155 Map<String, Record>[] all = new Map[] { normal, added, removed, merged };
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156 char[] x = new char[] {'n', 'a', 'r', 'm' };
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157 for (int i = 0; i < all.length; i++) {
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158 for (Record r : all[i].values()) {
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159 System.out.printf("%c %3o%6d %30tc\t\t%s", x[i], r.mode, r.size, (long) r.time * 1000, r.name1);
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160 if (r.name2 != null) {
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161 System.out.printf(" --> %s", r.name2);
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162 }
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163 System.out.println();
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164 }
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165 System.out.println();
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166 }
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167 }
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168
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169 /*package-local*/ static class Record {
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170 final int mode;
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171 final int size;
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172 final int time;
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173 final String name1;
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174 final String name2;
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175
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176 public Record(int fmode, int fsize, int ftime, String name1, String name2) {
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177 mode = fmode;
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178 size = fsize;
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179 time = ftime;
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180 this.name1 = name1;
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181 this.name2 = name2;
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182
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183 }
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184 }
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185 }