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annotate src/org/tmatesoft/hg/util/FileWalker.java @ 221:04735ce6bed2

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NPE when one of the flags is non-null
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 19 May 2011 04:45:52 +0200
parents 8248aae33f7d
children 26ad7827a62d
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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a3a2e5deb320 Updated contact address to support@hg4j.com
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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 File nextFile;
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35 private Path nextPath;
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36
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37 public FileWalker(File dir, Path.Source pathFactory) {
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38 startDir = dir;
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39 pathHelper = pathFactory;
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40 dirQueue = new LinkedList<File>();
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41 fileQueue = new LinkedList<File>();
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42 reset();
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43 }
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45 public void reset() {
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46 fileQueue.clear();
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47 dirQueue.clear();
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48 dirQueue.add(startDir);
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49 nextFile = null;
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50 nextPath = null;
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51 }
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53 public boolean hasNext() {
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54 return fill();
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55 }
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57 public void next() {
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58 if (!fill()) {
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59 throw new NoSuchElementException();
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60 }
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61 nextFile = fileQueue.removeFirst();
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62 nextPath = pathHelper.path(nextFile.getPath());
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63 }
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64
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65 public Path name() {
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66 return nextPath;
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67 }
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69 public File file() {
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70 return nextFile;
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71 }
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73 private File[] listFiles(File f) {
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74 // in case we need to solve os-related file issues (mac with some encodings?)
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75 return f.listFiles();
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76 }
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78 // return true when fill added any elements to fileQueue.
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79 private boolean fill() {
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80 while (fileQueue.isEmpty()) {
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81 if (dirQueue.isEmpty()) {
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82 return false;
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83 }
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84 while (!dirQueue.isEmpty()) {
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85 File dir = dirQueue.removeFirst();
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86 for (File f : listFiles(dir)) {
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87 if (f.isDirectory()) {
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88 if (!".hg".equals(f.getName())) {
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89 dirQueue.addLast(f);
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90 }
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91 } else {
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92 fileQueue.addLast(f);
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93 }
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94 }
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95 break;
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96 }
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97 }
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98 return !fileQueue.isEmpty();
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99 }
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100 }