Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/FileUtils.java @ 1116:2d393d79c097

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Added author names. gnv-artifacts/trunk@1262 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 04 Nov 2010 21:46:58 +0000
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 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
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9 package de.intevation.gnv.utils;
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10
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11 import java.io.BufferedInputStream;
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12 import java.io.File;
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13 import java.io.FileInputStream;
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14 import java.io.IOException;
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15 import java.io.InputStream;
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16 import java.io.OutputStream;
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17
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18 import java.util.Stack;
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19
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20 import java.util.zip.ZipEntry;
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21 import java.util.zip.ZipOutputStream;
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22
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23 /**
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24 * A helper class to provide some methods for working with files and
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25 * directories.
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26 *
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27 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public final class FileUtils
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31 {
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32 private FileUtils() {
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33 }
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34
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35 /**
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36 * Deletes everything in a directory.
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37 *
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38 * @param dir The directory.
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39 */
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40 public final static void deleteContent(File dir) {
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41 if (dir == null || !dir.isDirectory()) {
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42 return;
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43 }
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44
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45 File[] files = dir.listFiles();
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46 if (files != null) {
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47 for (File file: files) {
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48 deleteRecursive(file);
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49 }
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50 }
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51
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52 return;
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53 }
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54
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55 /**
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56 * Delete <i>file</i> and everything in <i>file</i> if it is a directory.
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57 *
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58 * @param file The file or directory.
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59 * @return true, if deletion was successful - otherwise false.
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60 */
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61 public final static boolean deleteRecursive(File file) {
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62
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63 if (file == null) {
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64 return false;
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65 }
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66
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67 if (file.isDirectory()) {
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68 File [] files = file.listFiles();
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69 if (files != null) {
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70 for (File sub: files) {
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71 if (!deleteRecursive(sub)) {
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72 return false;
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73 }
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74 }
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75 }
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76 }
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77
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78 return file.delete();
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79 }
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80
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81 /**
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82 * Put the given file or directory into a zip archive.
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83 *
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84 * @param file The file or directory.
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85 * @param outputStream The stream to write the archive to.
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86 * @throws IOException if an error occured while zip creation or writing to
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87 * output stream.
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88 */
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89 public static void createZipArchive(
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90 File file,
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91 OutputStream outputStream
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92 )
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93 throws IOException
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94 {
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95 ZipOutputStream out = new ZipOutputStream(outputStream);
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96
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97 if (file.isFile()) {
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98 copyFileToZip("", file, out);
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99 }
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100 else if (file.isDirectory()) {
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101
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102 Stack<PrefixDir> stack = new Stack<PrefixDir>();
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103 stack.push(new PrefixDir(file.getName() + "/", file));
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104
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105 while (!stack.isEmpty()) {
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106 PrefixDir pd = stack.pop();
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107
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108 ZipEntry dirEntry = new ZipEntry(pd.prefix);
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109 out.putNextEntry(dirEntry);
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110 out.closeEntry();
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111
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112 File [] files = pd.dir.listFiles();
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113 if (files != null) {
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114 for (File sub: files) {
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115 if (sub.isDirectory()) {
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116 stack.push(new PrefixDir(
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117 pd.prefix + sub.getName() + "/",
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118 sub));
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119 }
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120 else if (sub.isFile()) {
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121 copyFileToZip(pd.prefix, sub, out);
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122 }
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123 }
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124 }
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125 }
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126 }
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127
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128 out.finish();
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129 }
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130
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131 /**
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132 * A class representing a directory with a prefix.
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133 */
480
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134 private static final class PrefixDir {
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135
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136 String prefix;
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137 File dir;
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138
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139 public PrefixDir(String prefix, File dir) {
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140 this.prefix = prefix;
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141 this.dir = dir;
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142 }
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143
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144 } // class PrefixDir
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145
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146 /**
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147 * Write a file to zip archive.
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148 *
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149 * @param prefix A prefix.
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150 * @param file The file.
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151 * @param out The output stream.
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152 * @throws IOException if an error occured while writing to zip output
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153 * stream.
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154 */
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155 private static void copyFileToZip(
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156 String prefix,
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157 File file,
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158 ZipOutputStream out
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159 )
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160 throws IOException
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161 {
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162 String entryName = prefix + file.getName();
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163 ZipEntry entry = new ZipEntry(entryName);
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164 out.putNextEntry(entry);
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165 InputStream in = null;
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166 try {
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167 in =
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168 new BufferedInputStream(
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169 new FileInputStream(file), 20*1024);
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170
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171 byte [] buf = new byte[2048];
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172
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173 int r;
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174 while ((r = in.read(buf)) > 0) {
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175 out.write(buf, 0, r);
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176 }
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177 }
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178 finally {
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179 if (in != null) {
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180 try { in.close(); }
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181 catch (IOException ioe) {}
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182 }
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183 }
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184 out.closeEntry();
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185 }
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186 }
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org