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annotate src/org/tmatesoft/hg/core/HgFileInformer.java @ 264:6bb5e7ed051a

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Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Aug 2011 03:36:25 +0200
parents 8c951645bea0
children 9fb50c04f03c
rev   line source
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1 /*
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2 * Copyright (c) 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.core;
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18
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19 import org.tmatesoft.hg.internal.ManifestRevision;
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20 import org.tmatesoft.hg.repo.HgDataFile;
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21 import org.tmatesoft.hg.repo.HgRepository;
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22 import org.tmatesoft.hg.util.Path;
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23
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24 /**
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25 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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26 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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27 *
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28 * <p>Sample:
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29 * <pre><code>
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30 * HgFileInformer i = new HgFileInformer(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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31 * if (i.check(file)) {
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32 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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33 * catCmd.execute(...);
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34 * ...
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35 * }
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36 * </pre></code>
248
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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 HgFileInformer {
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42
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43 private final HgRepository repo;
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44 private boolean followRenames;
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45 private Nodeid cset;
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46 private ManifestRevision cachedManifest;
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47 private HgFileRevision fileRevision;
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48 private boolean checked, renamed;
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49
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50 public HgFileInformer(HgRepository hgRepo) {
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51 repo = hgRepo;
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52 }
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53
251
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54 /**
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55 * Select specific changelog revision
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56 *
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57 * @param nid changeset identifier
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58 * @return <code>this</code> for convenience
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59 */
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60 public HgFileInformer changeset(Nodeid nid) {
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61 if (nid == null || Nodeid.NULL.equals(nid)) {
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62 throw new IllegalArgumentException();
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63 }
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64 cset = nid;
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65 cachedManifest = null;
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66 fileRevision = null;
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67 return this;
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68 }
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69
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70 /**
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71 * Whether to check file origins, default is false (look up only the name supplied)
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72 *
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73 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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74 * @return <code>this</code> for convenience
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75 */
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76 public HgFileInformer followRenames(boolean follow) {
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77 followRenames = follow;
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78 fileRevision = null;
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79 return this;
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80 }
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81
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82 /**
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83 * Find file (or its origin, if {@link #followRenames(boolean)} was set to <code>true</code>) among files known at specified {@link #changeset(Nodeid)}.
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84 *
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85 * @param file name of the file in question
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86 * @return <code>true</code> if file is known at the selected changeset.
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87 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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88 */
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89 public boolean check(Path file) { // XXX IStatus instead of boolean?
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90 fileRevision = null;
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91 checked = false;
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92 renamed = false;
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93 if (cset == null || file == null || file.isDirectory()) {
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94 throw new IllegalArgumentException();
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95 }
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96 HgDataFile dataFile = repo.getFileNode(file);
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97 if (!dataFile.exists()) {
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98 return false;
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99 }
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100 if (cachedManifest == null) {
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101 int csetRev = repo.getChangelog().getLocalRevision(cset);
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102 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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103 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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104 // cachedManifest shall be meaningful - changelog.getLocalRevision above ensures we've got version that exists.
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105 }
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106 Nodeid toExtract = cachedManifest.nodeid(file.toString());
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107 try {
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108 if (toExtract == null && followRenames) {
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109 while (toExtract == null && dataFile.isCopy()) {
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110 renamed = true;
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111 file = dataFile.getCopySourceName();
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112 dataFile = repo.getFileNode(file);
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113 toExtract = cachedManifest.nodeid(file.toString());
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114 }
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115 }
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116 } catch (HgDataStreamException ex) {
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117 ex.printStackTrace(); // XXX log(INFO)
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118 // ignore now, however if there's IStatus retval, might report error with reasonable explanation.
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119 // Perhaps, may add a String reason() method with such info?
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120 }
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121 checked = true;
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122 if (toExtract != null) {
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123 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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124 return true;
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125 } // else String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation())
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126 return false;
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127 }
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128
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129 /**
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130 * @return result of the last {@link #check(Path)} call.
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131 */
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132 public boolean exists() {
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133 assertCheckRan();
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134 return fileRevision != null;
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135 }
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136
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137 /**
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138 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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139 */
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140 public boolean hasAnotherName() {
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141 assertCheckRan();
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142 return renamed;
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143 }
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144
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145 /**
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146 * @return holder for file revision information
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147 */
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148 public HgFileRevision getFileRevision() {
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149 assertCheckRan();
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150 return fileRevision;
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151 }
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152
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153 /**
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154 * Name of the checked file as it was known at the time of the specified changeset.
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155 *
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156 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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157 */
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158 public Path filename() {
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159 assertCheckRan();
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160 return fileRevision.getPath();
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161 }
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162
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163 /**
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164 * Revision of the checked file
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165 *
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166 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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167 */
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168 public Nodeid revision() {
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169 assertCheckRan();
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170 return fileRevision.getRevision();
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171 }
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172
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173 private void assertCheckRan() {
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174 if (!checked) {
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175 throw new HgBadStateException("Shall invoke #check(Path) first");
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176 }
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177 }
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178 }