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annotate src/org/tmatesoft/hg/util/FileWalker.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
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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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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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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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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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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67 public boolean hasNext() {
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68 return fill();
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69 }
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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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80 public Path name() {
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81 return nextPath;
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82 }
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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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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 }
229
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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 }