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annotate src/org/tmatesoft/hg/core/RepositoryTreeWalker.java @ 115:c0cc2535462c

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Introduced channels to pipeline (and easily filter) data streams
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 03 Feb 2011 23:32:08 +0100
parents a3a2e5deb320
children 4f509f5bc8cb
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
102
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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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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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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.repo.HgManifest;
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28 import org.tmatesoft.hg.repo.HgRepository;
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29 import org.tmatesoft.hg.util.PathPool;
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32 /**
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class RepositoryTreeWalker {
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39 private final HgRepository repo;
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40 private Path.Matcher matcher;
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41 private int startRev = 0, endRev = TIP;
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42 private Handler visitor;
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43 private boolean needDirs = false;
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44
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45 private final Mediator mediator = new Mediator();
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47 public RepositoryTreeWalker(HgRepository hgRepo) {
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48 this.repo = hgRepo;
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49 }
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51 public RepositoryTreeWalker range(int rev1, int rev2) {
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52 // if manifest range is different from that of changelog, need conversion utils (external?)
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53 throw HgRepository.notImplemented();
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54 }
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55
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56 public RepositoryTreeWalker revision(int rev) {
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57 startRev = endRev = rev;
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58 return this;
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59 }
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61 public RepositoryTreeWalker dirs(boolean include) {
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62 // XXX whether directories with directories only are include or not
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63 // now lists only directories with files
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64 needDirs = include;
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65 return this;
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66 }
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68 /**
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69 * Limit manifest walk to a subset of files.
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70 * @param pathMatcher - filter, pass <code>null</code> to clear.
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71 * @return <code>this</code> instance for convenience
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72 */
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73 public RepositoryTreeWalker match(Path.Matcher pathMatcher) {
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74 matcher = pathMatcher;
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75 return this;
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76 }
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78 public void walk(Handler handler) {
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79 if (handler == null) {
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80 throw new IllegalArgumentException();
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81 }
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82 if (visitor != null) {
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83 throw new ConcurrentModificationException();
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84 }
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85 try {
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86 visitor = handler;
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87 mediator.start();
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88 repo.getManifest().walk(startRev, endRev, mediator);
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89 } finally {
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90 mediator.done();
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91 visitor = null;
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92 }
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93 }
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95 /**
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96 * Callback to walk file/directory tree of a revision
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97 */
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98 public interface Handler {
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99 void begin(Nodeid manifestRevision);
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100 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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101 void file(FileRevision fileRevision); // XXX allow to check p is invalid (df.exists())
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102 void end(Nodeid manifestRevision);
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103 }
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104
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105 // I'd rather let RepositoryTreeWalker implement HgManifest.Inspector directly, but this pollutes API alot
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106 private class Mediator implements HgManifest.Inspector {
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107 private PathPool pathPool;
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108 private List<FileRevision> manifestContent;
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109 private Nodeid manifestNodeid;
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110
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111 public void start() {
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112 pathPool = new PathPool(repo.getPathHelper());
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113 }
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115 public void done() {
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116 manifestContent = null;
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117 pathPool = null;
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118 }
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119
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120 public boolean begin(int revision, Nodeid nid) {
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121 if (needDirs && manifestContent == null) {
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122 manifestContent = new LinkedList<FileRevision>();
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123 }
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124 visitor.begin(manifestNodeid = nid);
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125 return true;
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126 }
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127 public boolean end(int revision) {
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128 if (needDirs) {
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129 LinkedHashMap<Path, LinkedList<FileRevision>> breakDown = new LinkedHashMap<Path, LinkedList<FileRevision>>();
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130 for (FileRevision fr : manifestContent) {
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131 Path filePath = fr.getPath();
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132 Path dirPath = pathPool.parent(filePath);
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133 LinkedList<FileRevision> revs = breakDown.get(dirPath);
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134 if (revs == null) {
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135 revs = new LinkedList<FileRevision>();
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136 breakDown.put(dirPath, revs);
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137 }
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138 revs.addLast(fr);
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139 }
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140 for (Path dir : breakDown.keySet()) {
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141 visitor.dir(dir);
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142 for (FileRevision fr : breakDown.get(dir)) {
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143 visitor.file(fr);
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144 }
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145 }
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146 manifestContent.clear();
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147 }
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148 visitor.end(manifestNodeid);
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149 manifestNodeid = null;
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150 return true;
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151 }
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152 public boolean next(Nodeid nid, String fname, String flags) {
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153 Path p = pathPool.path(fname);
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154 if (matcher != null && !matcher.accept(p)) {
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155 return true;
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156 }
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157 FileRevision fr = new FileRevision(repo, nid, p);
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158 if (needDirs) {
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159 manifestContent.add(fr);
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160 } else {
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161 visitor.file(fr);
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162 }
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163 return true;
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164 }
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165 }
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166 }