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annotate src/org/tmatesoft/hg/core/RepositoryTreeWalker.java @ 64:19e9e220bf68

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Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 21 Jan 2011 05:56:43 +0100
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64
19e9e220bf68 Convenient commands constitute hi-level API. org.tmatesoft namespace, GPL2 statement
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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@svnkit.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 static com.tmate.hgkit.ll.HgRepository.TIP;
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20
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21 import java.util.ConcurrentModificationException;
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22 import java.util.LinkedHashMap;
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23 import java.util.LinkedList;
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24 import java.util.List;
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25
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26 import org.tmatesoft.hg.core.LogCommand.FileRevision;
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27 import org.tmatesoft.hg.util.PathPool;
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28
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29 import com.tmate.hgkit.ll.HgManifest;
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30 import com.tmate.hgkit.ll.HgRepository;
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31 import com.tmate.hgkit.ll.Nodeid;
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32
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33 /**
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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 public class RepositoryTreeWalker {
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39
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40 private final HgRepository repo;
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41 private Path.Matcher matcher;
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42 private int startRev = 0, endRev = TIP;
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43 private Handler visitor;
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44 private boolean needDirs = false;
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45
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46 private final Mediator mediator = new Mediator();
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47
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48 public RepositoryTreeWalker(HgRepository hgRepo) {
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49 this.repo = hgRepo;
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50 }
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51
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52 public RepositoryTreeWalker range(int rev1, int rev2) {
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53 // if manifest range is different from that of changelog, need conversion utils (external?)
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54 throw HgRepository.notImplemented();
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55 }
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56
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57 public RepositoryTreeWalker dirs(boolean include) {
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58 // XXX whether directories with directories only are include or not
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59 // now lists only directories with files
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60 needDirs = include;
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61 return this;
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62 }
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63
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64 /**
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65 * Limit manifest walk to a subset of files.
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66 * @param pathMatcher - filter, pass <code>null</code> to clear.
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67 * @return <code>this</code> instance for convenience
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68 */
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69 public RepositoryTreeWalker match(Path.Matcher pathMatcher) {
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70 matcher = pathMatcher;
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71 return this;
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72 }
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73
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74 public void walk(Handler handler) {
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75 if (handler == null) {
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76 throw new IllegalArgumentException();
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77 }
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78 if (visitor != null) {
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79 throw new ConcurrentModificationException();
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80 }
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81 try {
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82 visitor = handler;
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83 mediator.start();
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84 repo.getManifest().walk(startRev, endRev, mediator);
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85 } finally {
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86 visitor = null;
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87 mediator.done();
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88 }
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89 }
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90
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91 /**
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92 * Callback to walk file/directory tree of a revision
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93 */
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94 public interface Handler {
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95 void begin(Nodeid manifestRevision);
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96 void dir(Path p); // optionally invoked (if walker was configured to spit out directories) prior to any files from this dir and subdirs
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97 void file(FileRevision fileRevision); // XXX allow to check p is invalid (df.exists())
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98 void end(Nodeid manifestRevision);
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99 }
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100
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101 // I'd rather let RepositoryTreeWalker implement HgManifest.Inspector directly, but this pollutes API alot
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102 private class Mediator implements HgManifest.Inspector {
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103 private PathPool pathPool;
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104 private List<FileRevision> manifestContent;
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105 private Nodeid manifestNodeid;
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106
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107 public void start() {
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108 pathPool = new PathPool(repo.getPathHelper());
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109 }
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110
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111 public void done() {
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112 manifestContent = null;
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113 pathPool = null;
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114 }
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115
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116 public boolean begin(int revision, Nodeid nid) {
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117 if (needDirs && manifestContent == null) {
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118 manifestContent = new LinkedList<FileRevision>();
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119 }
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120 visitor.begin(manifestNodeid = nid);
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121 return true;
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122 }
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123 public boolean end(int revision) {
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124 if (needDirs) {
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125 LinkedHashMap<Path, LinkedList<FileRevision>> breakDown = new LinkedHashMap<Path, LinkedList<FileRevision>>();
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126 for (FileRevision fr : manifestContent) {
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127 Path filePath = fr.getPath();
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128 Path dirPath = pathPool.parent(filePath);
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129 LinkedList<FileRevision> revs = breakDown.get(dirPath);
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130 if (revs == null) {
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131 revs = new LinkedList<FileRevision>();
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132 breakDown.put(dirPath, revs);
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133 }
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134 revs.addLast(fr);
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135 }
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136 for (Path dir : breakDown.keySet()) {
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137 visitor.dir(dir);
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138 for (FileRevision fr : breakDown.get(dir)) {
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139 visitor.file(fr);
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140 }
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141 }
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142 manifestContent.clear();
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143 }
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144 visitor.end(manifestNodeid);
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145 manifestNodeid = null;
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146 return true;
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147 }
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148 public boolean next(Nodeid nid, String fname, String flags) {
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149 Path p = pathPool.path(fname);
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150 if (matcher != null && !matcher.accept(p)) {
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151 return true;
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152 }
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153 FileRevision fr = new FileRevision(repo, nid, p);
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154 if (needDirs) {
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155 manifestContent.add(fr);
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156 } else {
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157 visitor.file(fr);
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158 }
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159 return true;
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160 }
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161 }
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162 }