Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/FileUtils.java @ 1113:e7efbded1367
Summarized changes for RELEASE 1.1
gnv-artifacts/trunk@1251 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 30 Jun 2010 12:26:04 +0000 |
parents | a645bd23c1c8 |
children | f953c9a559d8 |
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1 package de.intevation.gnv.utils; |
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2 |
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3 import java.io.BufferedInputStream; |
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4 import java.io.File; |
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5 import java.io.FileInputStream; |
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6 import java.io.IOException; |
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7 import java.io.InputStream; |
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8 import java.io.OutputStream; |
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9 |
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10 import java.util.Stack; |
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11 |
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12 import java.util.zip.ZipEntry; |
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13 import java.util.zip.ZipOutputStream; |
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14 |
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15 /** |
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16 * A helper class to provide some methods for working with files and |
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17 * directories. |
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18 * |
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19 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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20 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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21 */ |
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22 public final class FileUtils |
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23 { |
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24 private FileUtils() { |
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25 } |
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26 |
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27 /** |
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28 * Deletes everything in a directory. |
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29 * |
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30 * @param dir The directory. |
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31 */ |
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32 public final static void deleteContent(File dir) { |
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33 if (dir == null || !dir.isDirectory()) { |
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34 return; |
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35 } |
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36 |
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37 File[] files = dir.listFiles(); |
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38 if (files != null) { |
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39 for (File file: files) { |
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40 deleteRecursive(file); |
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41 } |
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42 } |
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43 |
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44 return; |
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45 } |
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46 |
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47 /** |
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48 * Delete <i>file</i> and everything in <i>file</i> if it is a directory. |
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49 * |
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50 * @param file The file or directory. |
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51 * @return true, if deletion was successful - otherwise false. |
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52 */ |
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53 public final static boolean deleteRecursive(File file) { |
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54 |
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55 if (file == null) { |
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56 return false; |
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57 } |
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58 |
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59 if (file.isDirectory()) { |
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60 File [] files = file.listFiles(); |
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61 if (files != null) { |
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62 for (File sub: files) { |
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63 if (!deleteRecursive(sub)) { |
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64 return false; |
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65 } |
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66 } |
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67 } |
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68 } |
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69 |
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70 return file.delete(); |
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71 } |
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72 |
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73 /** |
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74 * Put the given file or directory into a zip archive. |
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75 * |
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76 * @param file The file or directory. |
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77 * @param outputStream The stream to write the archive to. |
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78 * @throws IOException if an error occured while zip creation or writing to |
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79 * output stream. |
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80 */ |
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81 public static void createZipArchive( |
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82 File file, |
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83 OutputStream outputStream |
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84 ) |
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85 throws IOException |
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86 { |
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87 ZipOutputStream out = new ZipOutputStream(outputStream); |
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88 |
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89 if (file.isFile()) { |
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90 copyFileToZip("", file, out); |
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91 } |
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92 else if (file.isDirectory()) { |
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93 |
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94 Stack<PrefixDir> stack = new Stack<PrefixDir>(); |
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95 stack.push(new PrefixDir(file.getName() + "/", file)); |
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96 |
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97 while (!stack.isEmpty()) { |
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98 PrefixDir pd = stack.pop(); |
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99 |
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100 ZipEntry dirEntry = new ZipEntry(pd.prefix); |
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101 out.putNextEntry(dirEntry); |
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102 out.closeEntry(); |
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103 |
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104 File [] files = pd.dir.listFiles(); |
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105 if (files != null) { |
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106 for (File sub: files) { |
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107 if (sub.isDirectory()) { |
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108 stack.push(new PrefixDir( |
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109 pd.prefix + sub.getName() + "/", |
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110 sub)); |
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111 } |
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112 else if (sub.isFile()) { |
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113 copyFileToZip(pd.prefix, sub, out); |
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114 } |
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115 } |
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116 } |
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117 } |
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118 } |
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119 |
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120 out.finish(); |
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121 } |
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122 |
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123 /** |
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124 * A class representing a directory with a prefix. |
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125 */ |
480
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126 private static final class PrefixDir { |
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127 |
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128 String prefix; |
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129 File dir; |
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130 |
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131 public PrefixDir(String prefix, File dir) { |
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132 this.prefix = prefix; |
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133 this.dir = dir; |
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134 } |
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135 |
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136 } // class PrefixDir |
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137 |
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138 /** |
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139 * Write a file to zip archive. |
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140 * |
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141 * @param prefix A prefix. |
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142 * @param file The file. |
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143 * @param out The output stream. |
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144 * @throws IOException if an error occured while writing to zip output |
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145 * stream. |
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146 */ |
480
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147 private static void copyFileToZip( |
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148 String prefix, |
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149 File file, |
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150 ZipOutputStream out |
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151 ) |
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152 throws IOException |
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153 { |
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154 String entryName = prefix + file.getName(); |
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155 ZipEntry entry = new ZipEntry(entryName); |
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156 out.putNextEntry(entry); |
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157 InputStream in = null; |
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158 try { |
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159 in = |
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160 new BufferedInputStream( |
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161 new FileInputStream(file), 20*1024); |
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162 |
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163 byte [] buf = new byte[2048]; |
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164 |
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165 int r; |
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166 while ((r = in.read(buf)) > 0) { |
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167 out.write(buf, 0, r); |
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168 } |
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169 } |
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170 finally { |
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171 if (in != null) { |
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172 try { in.close(); } |
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173 catch (IOException ioe) {} |
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174 } |
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175 } |
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176 out.closeEntry(); |
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177 } |
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178 } |
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179 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |