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annotate src/org/tmatesoft/hg/util/FileWalker.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents e1b29756f901
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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 public FileWalker(SessionContext ctx, File dir, Path.Source pathFactory) {
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45 this(ctx, dir, pathFactory, null);
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46 }
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48 /**
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49 * @see FileWalker#FileWalker(SessionContext, File, Path.Source, Matcher)
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50 */
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51 public FileWalker(SessionContext.Source ctxSource, File dir, Path.Source pathFactory, Path.Matcher scopeMatcher) {
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52 this(ctxSource.getSessionContext(), dir, pathFactory, scopeMatcher);
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53 }
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55 /**
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56 * Implementation of {@link FileIterator} with regular {@link java.io.File}.
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57 *
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58 * @param dir directory to start at, not <code>null</code>
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59 * @param pathFactory factory to create {@link Path} instances, not <code>null</code>
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60 * @param scopeMatcher - this matcher shall be capable to tell not only files of interest, but
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61 * also whether directories shall be traversed or not (Paths it gets in {@link Path.Matcher#accept(Path)} may
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62 * point to directories); may be <code>null</code>
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63 */
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64 public FileWalker(SessionContext ctx, File dir, Path.Source pathFactory, Path.Matcher scopeMatcher) {
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65 sessionContext = ctx;
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66 startDir = dir;
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67 pathHelper = pathFactory;
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68 dirQueue = new LinkedList<File>();
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69 fileQueue = new LinkedList<File>();
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70 scope = scopeMatcher;
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71 execCap = Internals.checkSupportsExecutables(startDir);
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72 linkCap = Internals.checkSupportsSymlinks(startDir);
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73 reset();
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74 }
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76 public void reset() {
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77 fileQueue.clear();
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78 dirQueue.clear();
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79 dirQueue.add(startDir);
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80 nextFile = new RegularFileInfo(sessionContext, supportsExecFlag(), supportsLinkFlag());
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81 nextPath = null;
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82 }
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84 public boolean hasNext() {
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85 return fill();
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86 }
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88 public void next() {
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89 if (!fill()) {
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90 throw new NoSuchElementException();
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91 }
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92 File next = fileQueue.removeFirst();
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93 nextFile.init(next);
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94 nextPath = pathHelper.path(next.getPath());
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95 }
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97 public Path name() {
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98 return nextPath;
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99 }
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101 public FileInfo file() {
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102 return nextFile;
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103 }
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105 public boolean inScope(Path file) {
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106 /* by default, no limits, all files are of interest */
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107 return scope == null ? true : scope.accept(file);
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108 }
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110 public boolean supportsExecFlag() {
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111 return execCap;
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112 }
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113
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114 public boolean supportsLinkFlag() {
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115 return linkCap;
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116 }
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117
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118 // returns non-null
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119 private File[] listFiles(File f) {
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120 // in case we need to solve os-related file issues (mac with some encodings?)
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121 File[] rv = f.listFiles();
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122 // there are chances directory we query files for is missing (deleted), just treat it as empty
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123 return rv == null ? new File[0] : rv;
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124 }
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125
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126 // return true when fill added any elements to fileQueue.
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127 private boolean fill() {
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128 while (fileQueue.isEmpty()) {
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129 if (dirQueue.isEmpty()) {
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130 return false;
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131 }
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132 while (!dirQueue.isEmpty()) {
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133 File dir = dirQueue.removeFirst();
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134 for (File f : listFiles(dir)) {
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135 final boolean isDir = f.isDirectory();
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136 Path path = pathHelper.path(isDir ? ensureTrailingSlash(f.getPath()) : f.getPath());
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137 if (!inScope(path)) {
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138 continue;
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139 }
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140 if (isDir) {
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141 // do not dive into <repo>/.hg and
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142 // if there's .hg/ under f/, it's a nested repository, which shall not be walked into
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143 if (".hg".equals(f.getName()) || new File(f, ".hg").isDirectory()) {
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144 continue;
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145 } else {
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146 dirQueue.addLast(f);
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147 }
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148 } else {
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149 fileQueue.addLast(f);
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150 }
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151 }
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152 break;
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153 }
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154 }
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155 return !fileQueue.isEmpty();
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156 }
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157
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158 private static String ensureTrailingSlash(String dirName) {
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159 if (dirName.length() > 0) {
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160 char last = dirName.charAt(dirName.length() - 1);
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161 if (last == '/' || last == File.separatorChar) {
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162 return dirName;
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163 }
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164 // if path already has platform-specific separator (which, BTW, it shall, according to File#getPath),
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165 // add similar, otherwise use our default.
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166 return dirName.indexOf(File.separatorChar) != -1 ? dirName.concat(File.separator) : dirName.concat("/");
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167 }
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168 return dirName;
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169 }
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170 }