Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 288:b11f6a08f748

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Avoid boxing int values and list resizes on revlog read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 10 Sep 2011 00:18:39 +0200
parents 7232b94f2ae3
children 8faad08c709b
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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18
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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21 import java.io.BufferedReader;
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22 import java.io.File;
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23 import java.io.FileReader;
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24 import java.io.IOException;
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25 import java.util.Collections;
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26 import java.util.LinkedHashMap;
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27 import java.util.Map;
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28 import java.util.TreeSet;
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29
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30 import org.tmatesoft.hg.core.HgBadStateException;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.internal.DataAccess;
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33 import org.tmatesoft.hg.util.Pair;
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34 import org.tmatesoft.hg.util.Path;
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35 import org.tmatesoft.hg.util.PathPool;
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36
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38 /**
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39 * @see http://mercurial.selenic.com/wiki/DirState
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40 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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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 class HgDirstate /* XXX RepoChangeListener */{
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46
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47 private final HgRepository repo;
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48 private final File dirstateFile;
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49 private final PathPool pathPool;
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50 private Map<Path, Record> normal;
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51 private Map<Path, Record> added;
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52 private Map<Path, Record> removed;
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53 private Map<Path, Record> merged;
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54 private Pair<Nodeid, Nodeid> parents;
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55 private String currentBranch;
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56
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57 public HgDirstate(HgRepository hgRepo, File dirstate, PathPool pathPool) {
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58 repo = hgRepo;
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59 dirstateFile = dirstate; // XXX decide whether file names shall be kept local to reader (see #branches()) or passed from outside
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60 this.pathPool = pathPool;
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61 }
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63 private void read() {
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64 normal = added = removed = merged = Collections.<Path, Record>emptyMap();
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65 if (dirstateFile == null || !dirstateFile.exists()) {
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66 return;
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67 }
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68 DataAccess da = repo.getDataAccess().create(dirstateFile);
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69 if (da.isEmpty()) {
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70 return;
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71 }
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72 // not sure linked is really needed here, just for ease of debug
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73 normal = new LinkedHashMap<Path, Record>();
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74 added = new LinkedHashMap<Path, Record>();
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75 removed = new LinkedHashMap<Path, Record>();
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76 merged = new LinkedHashMap<Path, Record>();
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77 try {
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78 parents = internalReadParents(da);
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79 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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80 while (!da.isEmpty()) {
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81 final byte state = da.readByte();
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82 final int fmode = da.readInt();
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83 final int size = da.readInt();
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84 final int time = da.readInt();
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85 final int nameLen = da.readInt();
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86 String fn1 = null, fn2 = null;
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87 byte[] name = new byte[nameLen];
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88 da.readBytes(name, 0, nameLen);
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89 for (int i = 0; i < nameLen; i++) {
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90 if (name[i] == 0) {
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91 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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92 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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93 break;
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94 }
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95 }
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96 if (fn1 == null) {
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97 fn1 = new String(name);
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98 }
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99 Record r = new Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
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100 if (state == 'n') {
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101 normal.put(r.name1, r);
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102 } else if (state == 'a') {
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103 added.put(r.name1, r);
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104 } else if (state == 'r') {
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105 removed.put(r.name1, r);
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106 } else if (state == 'm') {
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107 merged.put(r.name1, r);
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108 } else {
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109 // FIXME log error?
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110 }
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111 }
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112 } catch (IOException ex) {
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113 ex.printStackTrace(); // FIXME log error, clean dirstate?
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114 } finally {
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115 da.done();
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116 }
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117 }
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118
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119 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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120 byte[] parents = new byte[40];
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121 da.readBytes(parents, 0, 40);
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122 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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123 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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124 parents = null;
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125 return new Pair<Nodeid, Nodeid>(n1, n2);
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126 }
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127
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128 /**
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129 * @return array of length 2 with working copy parents, non null.
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130 */
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131 public Pair<Nodeid,Nodeid> parents() {
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132 if (parents == null) {
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133 parents = readParents(repo, dirstateFile);
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134 }
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135 return parents;
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136 }
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137
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138 /**
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139 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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140 */
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141 public static Pair<Nodeid, Nodeid> readParents(HgRepository repo, File dirstateFile) {
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142 // do not read whole dirstate if all we need is WC parent information
231
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143 if (dirstateFile == null || !dirstateFile.exists()) {
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144 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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145 }
252
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146 DataAccess da = repo.getDataAccess().create(dirstateFile);
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147 if (da.isEmpty()) {
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148 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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149 }
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150 try {
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151 return internalReadParents(da);
231
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152 } catch (IOException ex) {
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153 throw new HgBadStateException(ex); // XXX in fact, our exception is not the best solution here.
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154 } finally {
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155 da.done();
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156 }
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157 }
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158
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159 /**
284
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160 * XXX is it really proper place for the method?
252
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161 * @return branch associated with the working directory
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162 */
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163 public String branch() {
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164 if (currentBranch == null) {
284
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165 currentBranch = readBranch(repo);
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166 }
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167 return currentBranch;
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168 }
284
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169
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170 /**
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171 * XXX is it really proper place for the method?
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172 * @return branch associated with the working directory
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173 */
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174 public static String readBranch(HgRepository repo) {
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175 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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176 File branchFile = new File(repo.getRepositoryRoot(), "branch");
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177 if (branchFile.exists()) {
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178 try {
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179 BufferedReader r = new BufferedReader(new FileReader(branchFile));
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180 String b = r.readLine();
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181 if (b != null) {
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182 b = b.trim().intern();
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183 }
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184 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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185 r.close();
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186 } catch (IOException ex) {
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187 ex.printStackTrace(); // XXX log verbose debug, exception might be legal here (i.e. FileNotFound)
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188 // IGNORE
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189 }
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190 }
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191 return branch;
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192 }
231
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193
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194 // new, modifiable collection
284
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195 /*package-local*/ TreeSet<Path> all() {
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196 read();
284
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197 TreeSet<Path> rv = new TreeSet<Path>();
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diff changeset
198 @SuppressWarnings("unchecked")
284
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diff changeset
199 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
18
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200 for (int i = 0; i < all.length; i++) {
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201 for (Record r : all[i].values()) {
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202 rv.add(r.name1);
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203 }
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204 }
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205 return rv;
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diff changeset
206 }
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207
141
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208 /*package-local*/ Record checkNormal(Path fname) {
284
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209 return normal.get(fname);
18
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210 }
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diff changeset
211
141
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212 /*package-local*/ Record checkAdded(Path fname) {
284
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213 return added.get(fname);
141
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diff changeset
214 }
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diff changeset
215 /*package-local*/ Record checkRemoved(Path fname) {
18
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diff changeset
216 return removed.get(fname);
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diff changeset
217 }
141
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diff changeset
218 /*package-local*/ Record checkMerged(Path fname) {
284
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diff changeset
219 return merged.get(fname);
18
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diff changeset
220 }
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221
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diff changeset
222
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223
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diff changeset
224
93
d55d4eedfc57 Switch to Path instead of String in filenames returned by various status operations
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diff changeset
225 /*package-local*/ void dump() {
10
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diff changeset
226 read();
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227 @SuppressWarnings("unchecked")
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228 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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229 char[] x = new char[] {'n', 'a', 'r', 'm' };
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230 for (int i = 0; i < all.length; i++) {
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231 for (Record r : all[i].values()) {
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232 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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233 if (r.name2 != null) {
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234 System.out.printf(" --> %s", r.name2);
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235 }
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236 System.out.println();
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237 }
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238 System.out.println();
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239 }
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240 }
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241
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242 /*package-local*/ static class Record {
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243 final int mode;
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244 // it seems Dirstate keeps local file size (i.e. that with any filters already applied).
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245 // Thus, can't compare directly to HgDataFile.length()
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246 final int size;
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247 final int time;
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248 final Path name1;
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249 final Path name2;
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250
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251 public Record(int fmode, int fsize, int ftime, Path name1, Path name2) {
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252 mode = fmode;
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253 size = fsize;
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254 time = ftime;
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255 this.name1 = name1;
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256 this.name2 = name2;
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257
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258 }
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259 }
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260 }