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annotate graal/com.oracle.max.base/src/com/sun/max/io/FileTraversal.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
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1 /* |
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.io; |
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24 |
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25 import java.io.*; |
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26 |
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27 /** |
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28 * Provides a facility for walking a file system hierarchy similar to that provided by the Unix find(1) facility. |
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29 */ |
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30 public class FileTraversal { |
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31 |
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32 private boolean stopped; |
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33 |
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34 /** |
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35 * Handles a standard file resource encountered during the traversal. |
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36 * |
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37 * @param file a file resource for which {@link File#isFile()} returns {@code true} |
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38 */ |
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39 protected void visitFile(File file) { |
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40 } |
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41 |
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42 /** |
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43 * Handles a directory encountered during the traversal. |
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44 * |
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45 * @param directory a file resource for which {@link File#isDirectory()} returns {@code true} |
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46 * @return true if the traversal should process the file system hierarchy rooted at {@code directory}, false if it |
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47 * should be skipped |
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48 */ |
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49 protected boolean visitDirectory(File directory) { |
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50 return true; |
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51 } |
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52 |
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53 /** |
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54 * Handles a file resource encountered during the traversal that is neither a standard file or directory. |
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55 * |
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56 * @param other a file resource for which neither {@link File#isFile()} nor {@link File#isDirectory()} returns |
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57 * {@code true} |
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58 */ |
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59 protected void visitOther(File other) { |
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60 } |
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61 |
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62 /** |
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63 * Stops the traversal after the current file resource has been processed. This can be called from within an |
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64 * overriding implementation of {@link #visitFile(File)}, {@link #visitDirectory(File)} or |
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65 * {@link #visitOther(File)} to prematurely terminate a traversal. |
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66 */ |
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67 protected final void stop() { |
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68 stopped = true; |
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69 } |
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70 |
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71 /** |
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72 * Traverses the file hierarchy rooted at a given file. The {@linkplain #wasStopped() stopped} status of this |
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73 * traversal object is reset to {@code false} before the traversal begins. |
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74 * |
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75 * @param file the file or directory at which to start the traversal |
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76 */ |
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77 public void run(File file) { |
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78 stopped = false; |
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79 visit(file); |
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80 } |
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81 |
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82 /** |
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83 * Determines if the traversal was stopped before every file in the file hierarchy was traversed. |
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84 */ |
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85 public boolean wasStopped() { |
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86 return stopped; |
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87 } |
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88 |
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89 private boolean visit(File entry) { |
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90 File subdirectoryToTraverse = null; |
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91 if (entry.isFile()) { |
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92 visitFile(entry); |
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93 } else if (entry.isDirectory()) { |
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94 if (visitDirectory(entry)) { |
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95 subdirectoryToTraverse = entry; |
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96 } |
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97 } else { |
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98 visitOther(entry); |
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99 } |
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100 if (stopped) { |
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101 return false; |
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102 } |
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103 if (subdirectoryToTraverse != null) { |
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104 traverse(subdirectoryToTraverse); |
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105 if (stopped) { |
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106 return false; |
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107 } |
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108 } |
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109 return true; |
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110 } |
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111 |
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112 private void traverse(File directory) { |
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113 final File[] entries = directory.listFiles(); |
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114 if (entries != null) { |
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115 for (File entry : entries) { |
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116 if (!visit(entry)) { |
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117 return; |
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118 } |
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119 } |
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120 } |
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121 } |
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122 } |