Mercurial > jhg
annotate src/org/tmatesoft/hg/util/FileWalker.java @ 305:ae8d116f4ee2
Experimental code to build file history
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 22 Sep 2011 03:57:38 +0200 |
parents | ed6b74a58c66 |
children | 7f27122011c3 |
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.util; |
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18 |
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19 import java.io.File; |
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20 import java.util.LinkedList; |
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21 import java.util.NoSuchElementException; |
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22 |
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23 /** |
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24 * |
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25 * @author Artem Tikhomirov |
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26 * @author TMate Software Ltd. |
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27 */ |
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28 public class FileWalker implements FileIterator { |
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29 |
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30 private final File startDir; |
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31 private final Path.Source pathHelper; |
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32 private final LinkedList<File> dirQueue; |
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33 private final LinkedList<File> fileQueue; |
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34 private final Path.Matcher scope; |
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35 private RegularFileInfo nextFile; |
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36 private Path nextPath; |
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37 |
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38 public FileWalker(File dir, Path.Source pathFactory) { |
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39 this(dir, pathFactory, null); |
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40 } |
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41 |
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42 /** |
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43 * |
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44 * @param dir |
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45 * @param pathFactory |
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46 * @param scopeMatcher - this matcher shall be capable to tell not only files of interest, but |
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47 * also whether directories shall be traversed or not (Paths it gets in {@link Path.Matcher#accept(Path)} may |
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48 * point to directories) |
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49 */ |
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50 public FileWalker(File dir, Path.Source pathFactory, Path.Matcher scopeMatcher) { |
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51 startDir = dir; |
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52 pathHelper = pathFactory; |
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53 dirQueue = new LinkedList<File>(); |
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54 fileQueue = new LinkedList<File>(); |
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55 scope = scopeMatcher; |
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56 reset(); |
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57 } |
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58 |
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59 public void reset() { |
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60 fileQueue.clear(); |
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61 dirQueue.clear(); |
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62 dirQueue.add(startDir); |
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63 nextFile = new RegularFileInfo(); |
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64 nextPath = null; |
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65 } |
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66 |
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67 public boolean hasNext() { |
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68 return fill(); |
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69 } |
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70 |
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71 public void next() { |
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72 if (!fill()) { |
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73 throw new NoSuchElementException(); |
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74 } |
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75 File next = fileQueue.removeFirst(); |
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76 nextFile.init(next); |
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77 nextPath = pathHelper.path(next.getPath()); |
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78 } |
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79 |
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80 public Path name() { |
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81 return nextPath; |
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82 } |
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83 |
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84 public FileInfo file() { |
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85 return nextFile; |
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86 } |
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87 |
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88 public boolean inScope(Path file) { |
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89 /* by default, no limits, all files are of interest */ |
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90 return scope == null ? true : scope.accept(file); |
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91 } |
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92 |
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93 // returns non-null |
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94 private File[] listFiles(File f) { |
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95 // in case we need to solve os-related file issues (mac with some encodings?) |
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96 File[] rv = f.listFiles(); |
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97 // there are chances directory we query files for is missing (deleted), just treat it as empty |
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98 return rv == null ? new File[0] : rv; |
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99 } |
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100 |
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101 // return true when fill added any elements to fileQueue. |
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102 private boolean fill() { |
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103 while (fileQueue.isEmpty()) { |
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104 if (dirQueue.isEmpty()) { |
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105 return false; |
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106 } |
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107 while (!dirQueue.isEmpty()) { |
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108 File dir = dirQueue.removeFirst(); |
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109 for (File f : listFiles(dir)) { |
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110 final boolean isDir = f.isDirectory(); |
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111 Path path = pathHelper.path(isDir ? ensureTrailingSlash(f.getPath()) : f.getPath()); |
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112 if (!inScope(path)) { |
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113 continue; |
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114 } |
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115 if (isDir) { |
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116 if (!".hg/".equals(path.toString())) { |
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117 dirQueue.addLast(f); |
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118 } |
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119 } else { |
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120 fileQueue.addLast(f); |
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121 } |
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122 } |
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123 break; |
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124 } |
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125 } |
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126 return !fileQueue.isEmpty(); |
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127 } |
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128 |
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129 private static String ensureTrailingSlash(String dirName) { |
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130 if (dirName.length() > 0) { |
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131 char last = dirName.charAt(dirName.length() - 1); |
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132 if (last == '/' || last == File.separatorChar) { |
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133 return dirName; |
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134 } |
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135 // if path already has platform-specific separator (which, BTW, it shall, according to File#getPath), |
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136 // add similar, otherwise use our default. |
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137 return dirName.indexOf(File.separatorChar) != -1 ? dirName.concat(File.separator) : dirName.concat("/"); |
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138 } |
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139 return dirName; |
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140 } |
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141 } |