1 /* |
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * |
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4 * Redistribution and use in source and binary forms, with or without |
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5 * modification, are permitted provided that the following conditions |
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6 * are met: |
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7 * |
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8 * - Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * |
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11 * - Redistributions in binary form must reproduce the above copyright |
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12 * notice, this list of conditions and the following disclaimer in the |
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13 * documentation and/or other materials provided with the distribution. |
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14 * |
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15 * - Neither the name of Oracle nor the names of its |
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16 * contributors may be used to endorse or promote products derived |
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17 * from this software without specific prior written permission. |
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18 * |
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19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 */ |
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31 |
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32 /* |
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33 * This source code is provided to illustrate the usage of a given feature |
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34 * or technique and has been deliberately simplified. Additional steps |
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35 * required for a production-quality application, such as security checks, |
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36 * input validation and proper error handling, might not be present in |
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37 * this sample code. |
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38 */ |
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39 |
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40 |
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41 package com.sun.nio.zipfs; |
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42 |
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43 import java.nio.file.DirectoryStream; |
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44 import java.nio.file.ClosedDirectoryStreamException; |
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45 import java.nio.file.NotDirectoryException; |
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46 import java.nio.file.Path; |
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47 import java.util.Iterator; |
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48 import java.util.NoSuchElementException; |
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49 import java.io.IOException; |
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50 |
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51 /** |
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52 * |
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53 * @author Xueming Shen, Rajendra Gutupalli, Jaya Hangal |
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54 */ |
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55 |
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56 public class ZipDirectoryStream implements DirectoryStream<Path> { |
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57 |
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58 private final ZipFileSystem zipfs; |
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59 private final byte[] path; |
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60 private final DirectoryStream.Filter<? super Path> filter; |
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61 private volatile boolean isClosed; |
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62 private volatile Iterator<Path> itr; |
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63 |
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64 ZipDirectoryStream(ZipPath zipPath, |
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65 DirectoryStream.Filter<? super java.nio.file.Path> filter) |
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66 throws IOException |
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67 { |
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68 this.zipfs = zipPath.getFileSystem(); |
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69 this.path = zipPath.getResolvedPath(); |
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70 this.filter = filter; |
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71 // sanity check |
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72 if (!zipfs.isDirectory(path)) |
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73 throw new NotDirectoryException(zipPath.toString()); |
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74 } |
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75 |
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76 @Override |
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77 public synchronized Iterator<Path> iterator() { |
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78 if (isClosed) |
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79 throw new ClosedDirectoryStreamException(); |
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80 if (itr != null) |
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81 throw new IllegalStateException("Iterator has already been returned"); |
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82 |
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83 try { |
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84 itr = zipfs.iteratorOf(path, filter); |
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85 } catch (IOException e) { |
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86 throw new IllegalStateException(e); |
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87 } |
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88 return new Iterator<Path>() { |
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89 private Path next; |
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90 @Override |
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91 public boolean hasNext() { |
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92 if (isClosed) |
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93 return false; |
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94 return itr.hasNext(); |
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95 } |
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96 |
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97 @Override |
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98 public synchronized Path next() { |
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99 if (isClosed) |
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100 throw new NoSuchElementException(); |
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101 return itr.next(); |
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102 } |
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103 |
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104 @Override |
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105 public void remove() { |
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106 throw new UnsupportedOperationException(); |
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107 } |
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108 }; |
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109 } |
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110 |
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111 @Override |
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112 public synchronized void close() throws IOException { |
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113 isClosed = true; |
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114 } |
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115 |
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116 |
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117 } |
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