Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/utils/FileUtils.java @ 1087:92fce3b3d07f

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Centered histograms in pdf exports. gnv-artifacts/trunk@1189 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 10 Jun 2010 09:23:33 +0000
parents a645bd23c1c8
children f953c9a559d8
rev   line source
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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 */
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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 */
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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 :
http://dive4elements.wald.intevation.org