Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/FileTools.java @ 329:666417d5781c
Inserted a new utility class FileTools to work with files.
artifacts/trunk@2584 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Thu, 25 Aug 2011 14:30:59 +0000 |
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children | 0723859f776f |
rev | line source |
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329
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Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /* |
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2 * Copyright (c) 2010, 2011 by Intevation GmbH |
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3 * |
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4 * This program is free software under the LGPL (>=v2.1) |
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5 * Read the file LGPL.txt coming with the software for details |
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6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
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7 */ |
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8 package de.intevation.artifacts.common.utils; |
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9 |
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10 import java.io.BufferedInputStream; |
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11 import java.io.File; |
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12 import java.io.IOException; |
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13 import java.io.InputStream; |
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14 import java.io.FileInputStream; |
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15 import java.io.OutputStream; |
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16 |
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17 import java.util.Stack; |
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18 import java.util.List; |
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19 import java.util.Set; |
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20 import java.util.HashSet; |
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21 import java.util.ArrayList; |
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22 import java.util.zip.ZipEntry; |
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23 import java.util.zip.ZipOutputStream; |
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24 |
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25 import org.apache.log4j.Logger; |
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26 |
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27 import java.security.MessageDigest; |
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28 import java.security.NoSuchAlgorithmException; |
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29 |
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30 public class FileTools |
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31 { |
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32 private static Logger log = Logger.getLogger(FileTools.class); |
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33 |
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34 public static final String DIGEST = |
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35 System.getProperty("artifacts.common.file.cmp.digest", "MD5"); |
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36 |
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37 private FileTools() { |
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38 } |
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39 |
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40 |
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41 public static File getDirectory(String path, String name) { |
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42 if (path == null || name == null) { |
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43 return null; |
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44 } |
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45 |
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46 File dir = new File(path, name); |
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47 |
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48 if (!dir.exists()) { |
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49 log.debug( |
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50 "Directory '" + dir.getAbsolutePath() + "' doesn't " + |
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51 "exist. Try to create it."); |
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52 |
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53 return dir.mkdir() ? dir : null; |
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54 } |
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55 else { |
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56 return dir.isDirectory() ? dir : null; |
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57 } |
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58 } |
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59 |
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60 public static File repair(File file) { |
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61 file = file.getAbsoluteFile(); |
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62 if (file.exists()) { |
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63 return file; |
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64 } |
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65 Stack<String> parts = new Stack<String>(); |
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66 File curr = file; |
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67 while (curr != null) { |
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68 String name = curr.getName(); |
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69 if (name.length() > 0) { |
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70 parts.push(curr.getName()); |
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71 } |
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72 curr = curr.getParentFile(); |
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73 } |
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74 |
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75 curr = null; |
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76 OUTER: while (!parts.isEmpty()) { |
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77 String f = parts.pop(); |
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78 log.debug("fixing: '" + f + "'"); |
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79 if (curr == null) { |
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80 // XXX: Not totaly correct because there |
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81 // more than one root on none unix systems. |
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82 for (File root: File.listRoots()) { |
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83 File [] files = root.listFiles(); |
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84 if (files == null) { |
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85 log.warn("cannot list '" + root); |
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86 continue; |
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87 } |
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88 for (File candidate: files) { |
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89 if (candidate.getName().equalsIgnoreCase(f)) { |
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90 curr = new File(root, candidate.getName()); |
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91 continue OUTER; |
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92 } |
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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 else { |
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98 File [] files = curr.listFiles(); |
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99 if (files == null) { |
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100 log.warn("cannot list: '" + curr + "'"); |
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101 return file; |
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102 } |
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103 for (File candidate: files) { |
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104 if (candidate.getName().equalsIgnoreCase(f)) { |
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105 curr = new File(curr, candidate.getName()); |
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106 continue OUTER; |
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107 } |
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108 } |
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109 curr = null; |
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110 break; |
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111 } |
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112 } |
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113 |
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114 if (curr == null) { |
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115 log.warn("cannot repair path '" + file + "'"); |
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116 return file; |
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117 } |
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118 |
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119 return curr; |
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120 } |
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121 |
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122 public static class HashedFile |
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123 implements Comparable<HashedFile> |
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124 { |
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125 protected File file; |
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126 protected long length; |
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127 protected byte [] hash; |
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128 |
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129 public HashedFile(File file) { |
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130 this.file = file; |
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131 length = file.length(); |
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132 } |
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133 |
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134 public File getFile() { |
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135 return file; |
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136 } |
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137 |
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138 protected byte [] getHash() { |
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139 if (hash == null) { |
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140 InputStream in = null; |
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141 |
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142 try { |
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143 in = new FileInputStream(file); |
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144 |
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145 MessageDigest digest = MessageDigest.getInstance(DIGEST); |
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146 |
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147 byte [] buf = new byte[40*1024]; |
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148 int r; |
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149 |
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150 while ((r = in.read(buf)) >= 0) { |
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151 digest.update(buf, 0, r); |
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152 } |
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153 |
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154 hash = digest.digest(); |
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155 } |
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156 catch (IOException ioe) { |
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157 log.error(ioe); |
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158 hash = new byte[0]; |
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159 } |
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160 catch (NoSuchAlgorithmException nsae) { |
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161 log.error(nsae); |
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162 hash = new byte[0]; |
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163 } |
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164 finally { |
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165 if (in != null) { |
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166 try { |
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167 in.close(); |
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168 } |
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169 catch (IOException ioe) { |
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170 log.error(ioe); |
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171 } |
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172 } |
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173 } |
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174 } |
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175 return hash; |
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176 } |
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177 |
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178 @Override |
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179 public int compareTo(HashedFile other) { |
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180 if (length < other.length) return -1; |
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181 if (length > other.length) return +1; |
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182 return compare(getHash(), other.getHash()); |
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183 } |
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184 |
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185 private static int compare(byte [] a, byte [] b) { |
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186 if (a.length < b.length) return -1; |
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187 if (a.length > b.length) return +1; |
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188 for (int i = 0; i < a.length; ++i) { |
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189 int x = a[i] & 0xff; |
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190 int y = b[i] & 0xff; |
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191 if (x < y) return -1; |
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192 if (x > y) return +1; |
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193 } |
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194 return 0; |
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195 } |
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196 |
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197 @Override |
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198 public boolean equals(Object other) { |
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199 return other instanceof HashedFile |
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200 && ((HashedFile)other).compareTo(this) == 0; |
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201 } |
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202 |
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203 @Override |
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204 public int hashCode() { |
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205 return (int)(length ^ (length >>> 32)); |
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206 } |
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207 } // class HashedFile |
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208 |
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209 public static List<File> uniqueFiles(List<File> files) { |
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210 |
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211 Set<HashedFile> set = new HashSet<HashedFile>(); |
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212 |
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213 for (File file: files) { |
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214 if (!set.add(new HashedFile(file))) { |
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215 log.warn("file '" + file + "' is a duplicate."); |
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216 } |
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217 } |
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218 |
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219 ArrayList<File> out = new ArrayList<File>(set.size()); |
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220 for (HashedFile hf: set) { |
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221 out.add(hf.file); |
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222 } |
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223 |
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224 return out; |
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225 } |
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226 |
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227 public interface FileVisitor { |
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228 boolean visit(File file); |
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229 } // Visitor |
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230 |
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231 public static void walkTree(File root, FileVisitor visitor) { |
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232 |
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233 Stack<File> stack = new Stack<File>(); |
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234 |
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235 stack.push(root); |
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236 |
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237 while (!stack.isEmpty()) { |
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238 File current = stack.pop(); |
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239 if (!visitor.visit(current)) break; |
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240 if (current.isDirectory()) { |
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241 File [] subs = current.listFiles(); |
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242 if (subs != null) { |
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243 for (File f: subs) { |
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244 stack.push(f); |
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245 } |
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246 } |
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247 } |
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248 } |
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249 } |
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250 |
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251 /** |
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252 * Deletes everything in a directory. |
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253 * |
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254 * @param dir The directory. |
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255 */ |
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256 public final static void deleteContent(File dir) { |
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257 if (dir == null || !dir.isDirectory()) { |
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258 return; |
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259 } |
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260 |
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261 File[] files = dir.listFiles(); |
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262 if (files != null) { |
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263 for (File file: files) { |
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264 deleteRecursive(file); |
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265 } |
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266 } |
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267 |
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268 return; |
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269 } |
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270 |
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271 /** |
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272 * Delete <i>file</i> and everything in <i>file</i> if it is a directory. |
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273 * |
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274 * @param file The file or directory. |
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275 * @return true, if deletion was successful - otherwise false. |
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276 */ |
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277 public final static boolean deleteRecursive(File file) { |
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278 |
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279 if (file == null) { |
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280 return false; |
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281 } |
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282 |
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283 if (file.isDirectory()) { |
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284 File [] files = file.listFiles(); |
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285 if (files != null) { |
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286 for (File sub: files) { |
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287 if (!deleteRecursive(sub)) { |
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288 return false; |
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289 } |
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290 } |
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291 } |
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292 } |
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293 |
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294 return file.delete(); |
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295 } |
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296 |
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297 /** |
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298 * Put the given file or directory into a zip archive. |
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299 * |
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300 * @param file The file or directory. |
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301 * @param outputStream The stream to write the archive to. |
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302 * @throws IOException if an error occured while zip creation or writing to |
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303 * output stream. |
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304 */ |
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305 public static void createZipArchive( |
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306 File file, |
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307 OutputStream outputStream |
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308 ) |
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309 throws IOException |
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310 { |
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311 ZipOutputStream out = new ZipOutputStream(outputStream); |
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312 |
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313 if (file.isFile()) { |
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314 copyFileToZip("", file, out); |
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315 } |
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316 else if (file.isDirectory()) { |
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317 |
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318 Stack<PrefixDir> stack = new Stack<PrefixDir>(); |
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319 stack.push(new PrefixDir(file.getName() + "/", file)); |
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320 |
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321 while (!stack.isEmpty()) { |
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322 PrefixDir pd = stack.pop(); |
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323 |
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324 ZipEntry dirEntry = new ZipEntry(pd.prefix); |
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325 out.putNextEntry(dirEntry); |
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326 out.closeEntry(); |
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327 |
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328 File [] files = pd.dir.listFiles(); |
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329 if (files != null) { |
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330 for (File sub: files) { |
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331 if (sub.isDirectory()) { |
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332 stack.push(new PrefixDir( |
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333 pd.prefix + sub.getName() + "/", |
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334 sub)); |
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335 } |
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336 else if (sub.isFile()) { |
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337 copyFileToZip(pd.prefix, sub, out); |
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338 } |
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339 } |
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340 } |
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341 } |
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342 } |
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343 |
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344 out.finish(); |
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345 } |
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346 |
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347 /** |
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348 * A class representing a directory with a prefix. |
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349 */ |
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350 private static final class PrefixDir { |
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351 |
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352 String prefix; |
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353 File dir; |
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354 |
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355 public PrefixDir(String prefix, File dir) { |
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356 this.prefix = prefix; |
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357 this.dir = dir; |
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358 } |
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359 |
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360 } // class PrefixDir |
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361 |
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362 /** |
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363 * Write a file to zip archive. |
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364 * |
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365 * @param prefix A prefix. |
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366 * @param file The file. |
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367 * @param out The output stream. |
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368 * @throws IOException if an error occured while writing to zip output |
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369 * stream. |
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370 */ |
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371 private static void copyFileToZip( |
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372 String prefix, |
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373 File file, |
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374 ZipOutputStream out |
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375 ) |
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376 throws IOException |
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377 { |
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378 String entryName = prefix + file.getName(); |
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379 ZipEntry entry = new ZipEntry(entryName); |
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380 out.putNextEntry(entry); |
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381 InputStream in = null; |
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382 try { |
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383 in = |
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384 new BufferedInputStream( |
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385 new FileInputStream(file), 20*1024); |
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386 |
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387 byte [] buf = new byte[2048]; |
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388 |
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389 int r; |
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390 while ((r = in.read(buf)) > 0) { |
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391 out.write(buf, 0, r); |
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392 } |
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393 } |
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394 finally { |
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395 if (in != null) { |
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396 try { in.close(); } |
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397 catch (IOException ioe) {} |
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398 } |
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399 } |
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400 out.closeEntry(); |
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401 } |
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402 } |
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403 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |