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annotate src/org/tmatesoft/hg/util/FileWalker.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents bd5926e24aa3
children e1b29756f901
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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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22
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23 import org.tmatesoft.hg.core.SessionContext;
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24 import org.tmatesoft.hg.internal.Internals;
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25
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26 /**
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27 * Implementation of {@link FileIterator} using regular {@link java.io.File}
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28 *
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29 * @author Artem Tikhomirov
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30 * @author TMate Software Ltd.
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31 */
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32 public class FileWalker implements FileIterator {
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34 private final File startDir;
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35 private final Path.Source pathHelper;
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36 private final LinkedList<File> dirQueue;
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37 private final LinkedList<File> fileQueue;
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38 private final Path.Matcher scope;
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39 private final boolean execCap, linkCap;
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40 private final SessionContext sessionContext;
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41 private RegularFileInfo nextFile;
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42 private Path nextPath;
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43
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44 // TODO FileWalker to accept SessionContext.Source and SessionContext to implement SessionContext.Source
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45 // (if it doesn't break binary compatibility)
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46 public FileWalker(SessionContext ctx, File dir, Path.Source pathFactory) {
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47 this(ctx, dir, pathFactory, null);
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48 }
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49
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50 /**
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51 *
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52 * @param dir
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53 * @param pathFactory
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54 * @param scopeMatcher - this matcher shall be capable to tell not only files of interest, but
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55 * also whether directories shall be traversed or not (Paths it gets in {@link Path.Matcher#accept(Path)} may
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56 * point to directories)
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57 */
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58 public FileWalker(SessionContext ctx, File dir, Path.Source pathFactory, Path.Matcher scopeMatcher) {
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59 sessionContext = ctx;
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60 startDir = dir;
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61 pathHelper = pathFactory;
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62 dirQueue = new LinkedList<File>();
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63 fileQueue = new LinkedList<File>();
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64 scope = scopeMatcher;
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65 execCap = Internals.checkSupportsExecutables(startDir);
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66 linkCap = Internals.checkSupportsSymlinks(startDir);
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67 reset();
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68 }
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70 public void reset() {
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71 fileQueue.clear();
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72 dirQueue.clear();
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73 dirQueue.add(startDir);
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74 nextFile = new RegularFileInfo(sessionContext, supportsExecFlag(), supportsLinkFlag());
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75 nextPath = null;
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76 }
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78 public boolean hasNext() {
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79 return fill();
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80 }
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82 public void next() {
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83 if (!fill()) {
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84 throw new NoSuchElementException();
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85 }
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86 File next = fileQueue.removeFirst();
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87 nextFile.init(next);
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88 nextPath = pathHelper.path(next.getPath());
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89 }
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91 public Path name() {
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92 return nextPath;
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93 }
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95 public FileInfo file() {
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96 return nextFile;
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97 }
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98
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99 public boolean inScope(Path file) {
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100 /* by default, no limits, all files are of interest */
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101 return scope == null ? true : scope.accept(file);
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102 }
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104 public boolean supportsExecFlag() {
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105 return execCap;
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106 }
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108 public boolean supportsLinkFlag() {
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109 return linkCap;
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110 }
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111
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112 // returns non-null
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113 private File[] listFiles(File f) {
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114 // in case we need to solve os-related file issues (mac with some encodings?)
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115 File[] rv = f.listFiles();
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116 // there are chances directory we query files for is missing (deleted), just treat it as empty
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117 return rv == null ? new File[0] : rv;
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118 }
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119
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120 // return true when fill added any elements to fileQueue.
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121 private boolean fill() {
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122 while (fileQueue.isEmpty()) {
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123 if (dirQueue.isEmpty()) {
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124 return false;
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125 }
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126 while (!dirQueue.isEmpty()) {
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127 File dir = dirQueue.removeFirst();
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128 for (File f : listFiles(dir)) {
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129 final boolean isDir = f.isDirectory();
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130 Path path = pathHelper.path(isDir ? ensureTrailingSlash(f.getPath()) : f.getPath());
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131 if (!inScope(path)) {
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132 continue;
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133 }
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134 if (isDir) {
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135 // do not dive into <repo>/.hg and
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136 // if there's .hg/ under f/, it's a nested repository, which shall not be walked into
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137 if (".hg".equals(f.getName()) || new File(f, ".hg").isDirectory()) {
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138 continue;
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139 } else {
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140 dirQueue.addLast(f);
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141 }
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142 } else {
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143 fileQueue.addLast(f);
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144 }
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145 }
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146 break;
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147 }
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148 }
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149 return !fileQueue.isEmpty();
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150 }
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151
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152 private static String ensureTrailingSlash(String dirName) {
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153 if (dirName.length() > 0) {
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154 char last = dirName.charAt(dirName.length() - 1);
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155 if (last == '/' || last == File.separatorChar) {
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156 return dirName;
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157 }
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158 // if path already has platform-specific separator (which, BTW, it shall, according to File#getPath),
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159 // add similar, otherwise use our default.
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160 return dirName.indexOf(File.separatorChar) != -1 ? dirName.concat(File.separator) : dirName.concat("/");
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161 }
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162 return dirName;
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163 }
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164 }