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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 242:ad6a046943be

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Improved reading of sparse revisions from a revlog
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Jun 2011 15:19:07 +0200
parents 1792b37650f2
children a6d19adc2636
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.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.DataAccessProvider;
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30 import org.tmatesoft.hg.util.Path;
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31
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33 /**
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34 * @see http://mercurial.selenic.com/wiki/DirState
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35 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 class HgDirstate {
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41
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42 private final DataAccessProvider accessProvider;
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43 private final File dirstateFile;
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44 // deliberate String, not Path as it seems useless to keep Path here
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45 private Map<String, Record> normal;
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46 private Map<String, Record> added;
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47 private Map<String, Record> removed;
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48 private Map<String, Record> merged;
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49 private Nodeid p1, p2;
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50
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51 /*package-local*/ HgDirstate() {
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52 // empty instance
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53 accessProvider = null;
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54 dirstateFile = null;
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55 }
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57 public HgDirstate(DataAccessProvider dap, File dirstate) {
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58 accessProvider = dap;
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59 dirstateFile = dirstate;
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60 }
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62 private void read() {
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63 normal = added = removed = merged = Collections.<String, Record>emptyMap();
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64 if (dirstateFile == null || !dirstateFile.exists()) {
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65 return;
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66 }
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67 DataAccess da = accessProvider.create(dirstateFile);
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68 if (da.isEmpty()) {
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69 return;
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70 }
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71 // not sure linked is really needed here, just for ease of debug
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72 normal = new LinkedHashMap<String, Record>();
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73 added = new LinkedHashMap<String, Record>();
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74 removed = new LinkedHashMap<String, Record>();
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75 merged = new LinkedHashMap<String, Record>();
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76 try {
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77 byte[] parents = new byte[40];
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78 da.readBytes(parents, 0, 40);
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79 p1 = Nodeid.fromBinary(parents, 0);
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80 p2 = Nodeid.fromBinary(parents, 20);
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81 parents = null;
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82 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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83 while (!da.isEmpty()) {
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84 final byte state = da.readByte();
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85 final int fmode = da.readInt();
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86 final int size = da.readInt();
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87 final int time = da.readInt();
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88 final int nameLen = da.readInt();
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89 String fn1 = null, fn2 = null;
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90 byte[] name = new byte[nameLen];
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91 da.readBytes(name, 0, nameLen);
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92 for (int i = 0; i < nameLen; i++) {
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93 if (name[i] == 0) {
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94 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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95 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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96 break;
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97 }
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98 }
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99 if (fn1 == null) {
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100 fn1 = new String(name);
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101 }
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102 Record r = new Record(fmode, size, time, fn1, fn2);
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103 if (state == 'n') {
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104 normal.put(r.name1, r);
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105 } else if (state == 'a') {
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106 added.put(r.name1, r);
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107 } else if (state == 'r') {
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108 removed.put(r.name1, r);
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109 } else if (state == 'm') {
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110 merged.put(r.name1, r);
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111 } else {
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112 // FIXME log error?
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113 }
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114 }
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115 } catch (IOException ex) {
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116 ex.printStackTrace(); // FIXME log error, clean dirstate?
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117 } finally {
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118 da.done();
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119 }
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120 }
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121
231
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122 // do not read whole dirstate if all we need is WC parent information
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123 private void readParents() {
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124 if (dirstateFile == null || !dirstateFile.exists()) {
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125 return;
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126 }
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127 DataAccess da = accessProvider.create(dirstateFile);
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128 if (da.isEmpty()) {
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129 return;
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130 }
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131 try {
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132 byte[] parents = new byte[40];
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133 da.readBytes(parents, 0, 40);
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134 p1 = Nodeid.fromBinary(parents, 0);
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135 p2 = Nodeid.fromBinary(parents, 20);
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136 parents = null;
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137 } catch (IOException ex) {
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138 throw new HgBadStateException(ex); // XXX in fact, our exception is not the best solution here.
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139 } finally {
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140 da.done();
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141 }
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142 }
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143
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144 /**
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145 * @return array of length 2 with working copy parents, non null.
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146 */
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147 public Nodeid[] parents() {
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148 if (p1 == null) {
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149 readParents();
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150 }
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151 Nodeid[] rv = new Nodeid[2];
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152 rv[0] = p1;
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153 rv[1] = p2;
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154 return rv;
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155 }
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156
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157 // new, modifiable collection
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158 /*package-local*/ TreeSet<String> all() {
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159 read();
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160 TreeSet<String> rv = new TreeSet<String>();
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161 @SuppressWarnings("unchecked")
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162 Map<String, Record>[] all = new Map[] { normal, added, removed, merged };
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163 for (int i = 0; i < all.length; i++) {
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164 for (Record r : all[i].values()) {
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165 rv.add(r.name1);
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166 }
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167 }
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168 return rv;
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169 }
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170
141
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171 /*package-local*/ Record checkNormal(Path fname) {
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172 return normal.get(fname.toString());
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173 }
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174
141
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175 /*package-local*/ Record checkAdded(Path fname) {
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176 return added.get(fname.toString());
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177 }
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178 /*package-local*/ Record checkRemoved(Path fname) {
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179 return removed.get(fname.toString());
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180 }
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181 /*package-local*/ Record checkRemoved(String fname) {
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182 return removed.get(fname);
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183 }
141
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184 /*package-local*/ Record checkMerged(Path fname) {
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185 return merged.get(fname.toString());
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186 }
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187
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188
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189
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190
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191 /*package-local*/ void dump() {
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192 read();
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193 @SuppressWarnings("unchecked")
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194 Map<String, Record>[] all = new Map[] { normal, added, removed, merged };
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195 char[] x = new char[] {'n', 'a', 'r', 'm' };
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196 for (int i = 0; i < all.length; i++) {
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197 for (Record r : all[i].values()) {
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198 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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199 if (r.name2 != null) {
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200 System.out.printf(" --> %s", r.name2);
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201 }
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202 System.out.println();
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203 }
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204 System.out.println();
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205 }
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206 }
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207
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208 /*package-local*/ static class Record {
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209 final int mode;
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210 final int size;
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211 final int time;
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212 final String name1;
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213 final String name2;
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214
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215 public Record(int fmode, int fsize, int ftime, String name1, String name2) {
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216 mode = fmode;
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217 size = fsize;
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218 time = ftime;
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219 this.name1 = name1;
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220 this.name2 = name2;
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221
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222 }
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223 }
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224 }