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annotate artifacts-common/src/main/java/de/intevation/artifacts/common/utils/FileTools.java @ 329:666417d5781c

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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>
date Thu, 25 Aug 2011 14:30:59 +0000
parents
children 0723859f776f
rev   line source
329
666417d5781c Inserted a new utility class FileTools to work with files.
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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() {
666417d5781c Inserted a new utility class FileTools to work with files.
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135 return file;
666417d5781c Inserted a new utility class FileTools to work with files.
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136 }
666417d5781c Inserted a new utility class FileTools to work with files.
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137
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138 protected byte [] getHash() {
666417d5781c Inserted a new utility class FileTools to work with files.
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139 if (hash == null) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
140 InputStream in = null;
666417d5781c Inserted a new utility class FileTools to work with files.
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141
666417d5781c Inserted a new utility class FileTools to work with files.
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142 try {
666417d5781c Inserted a new utility class FileTools to work with files.
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143 in = new FileInputStream(file);
666417d5781c Inserted a new utility class FileTools to work with files.
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144
666417d5781c Inserted a new utility class FileTools to work with files.
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145 MessageDigest digest = MessageDigest.getInstance(DIGEST);
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146
666417d5781c Inserted a new utility class FileTools to work with files.
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147 byte [] buf = new byte[40*1024];
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148 int r;
666417d5781c Inserted a new utility class FileTools to work with files.
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149
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diff changeset
150 while ((r = in.read(buf)) >= 0) {
666417d5781c Inserted a new utility class FileTools to work with files.
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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();
666417d5781c Inserted a new utility class FileTools to work with files.
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155 }
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156 catch (IOException ioe) {
666417d5781c Inserted a new utility class FileTools to work with files.
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157 log.error(ioe);
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158 hash = new byte[0];
666417d5781c Inserted a new utility class FileTools to work with files.
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159 }
666417d5781c Inserted a new utility class FileTools to work with files.
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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 {
666417d5781c Inserted a new utility class FileTools to work with files.
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165 if (in != null) {
666417d5781c Inserted a new utility class FileTools to work with files.
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166 try {
666417d5781c Inserted a new utility class FileTools to work with files.
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167 in.close();
666417d5781c Inserted a new utility class FileTools to work with files.
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168 }
666417d5781c Inserted a new utility class FileTools to work with files.
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169 catch (IOException ioe) {
666417d5781c Inserted a new utility class FileTools to work with files.
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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;
666417d5781c Inserted a new utility class FileTools to work with files.
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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;
666417d5781c Inserted a new utility class FileTools to work with files.
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195 }
666417d5781c Inserted a new utility class FileTools to work with files.
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196
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diff changeset
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() {
666417d5781c Inserted a new utility class FileTools to work with files.
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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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diff changeset
209 public static List<File> uniqueFiles(List<File> files) {
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210
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
211 Set<HashedFile> set = new HashSet<HashedFile>();
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diff changeset
212
666417d5781c Inserted a new utility class FileTools to work with files.
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213 for (File file: files) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
214 if (!set.add(new HashedFile(file))) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
215 log.warn("file '" + file + "' is a duplicate.");
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diff changeset
216 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
217 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
218
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
219 ArrayList<File> out = new ArrayList<File>(set.size());
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
220 for (HashedFile hf: set) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
221 out.add(hf.file);
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
222 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
223
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
224 return out;
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
225 }
666417d5781c Inserted a new utility class FileTools to work with files.
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226
666417d5781c Inserted a new utility class FileTools to work with files.
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227 public interface FileVisitor {
666417d5781c Inserted a new utility class FileTools to work with files.
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228 boolean visit(File file);
666417d5781c Inserted a new utility class FileTools to work with files.
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229 } // Visitor
666417d5781c Inserted a new utility class FileTools to work with files.
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230
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
231 public static void walkTree(File root, FileVisitor visitor) {
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232
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
233 Stack<File> stack = new Stack<File>();
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diff changeset
234
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
235 stack.push(root);
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
236
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
237 while (!stack.isEmpty()) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
238 File current = stack.pop();
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
239 if (!visitor.visit(current)) break;
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
240 if (current.isDirectory()) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
241 File [] subs = current.listFiles();
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
242 if (subs != null) {
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
243 for (File f: subs) {
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
244 stack.push(f);
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
245 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
246 }
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
247 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
248 }
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
249 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
250
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
251 /**
666417d5781c Inserted a new utility class FileTools to work with files.
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252 * Deletes everything in a directory.
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
253 *
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254 * @param dir The directory.
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255 */
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
256 public final static void deleteContent(File dir) {
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
257 if (dir == null || !dir.isDirectory()) {
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diff changeset
258 return;
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
259 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
260
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
261 File[] files = dir.listFiles();
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
262 if (files != null) {
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
263 for (File file: files) {
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
264 deleteRecursive(file);
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
265 }
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
266 }
666417d5781c Inserted a new utility class FileTools to work with files.
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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()) {
666417d5781c Inserted a new utility class FileTools to work with files.
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284 File [] files = file.listFiles();
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285 if (files != null) {
666417d5781c Inserted a new utility class FileTools to work with files.
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286 for (File sub: files) {
666417d5781c Inserted a new utility class FileTools to work with 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()) {
666417d5781c Inserted a new utility class FileTools to work with files.
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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) {
666417d5781c Inserted a new utility class FileTools to work with files.
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330 for (File sub: files) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
331 if (sub.isDirectory()) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
332 stack.push(new PrefixDir(
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
333 pd.prefix + sub.getName() + "/",
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diff changeset
334 sub));
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diff changeset
335 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
336 else if (sub.isFile()) {
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diff changeset
337 copyFileToZip(pd.prefix, sub, out);
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338 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
339 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
340 }
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diff changeset
341 }
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diff changeset
342 }
666417d5781c Inserted a new utility class FileTools to work with files.
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343
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344 out.finish();
666417d5781c Inserted a new utility class FileTools to work with files.
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345 }
666417d5781c Inserted a new utility class FileTools to work with files.
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346
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347 /**
666417d5781c Inserted a new utility class FileTools to work with files.
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348 * A class representing a directory with a prefix.
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diff changeset
349 */
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diff changeset
350 private static final class PrefixDir {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
351
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
352 String prefix;
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
353 File dir;
666417d5781c Inserted a new utility class FileTools to work with files.
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354
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355 public PrefixDir(String prefix, File dir) {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
356 this.prefix = prefix;
666417d5781c Inserted a new utility class FileTools to work with files.
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357 this.dir = dir;
666417d5781c Inserted a new utility class FileTools to work with files.
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358 }
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
359
666417d5781c Inserted a new utility class FileTools to work with files.
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360 } // class PrefixDir
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
361
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
362 /**
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
363 * Write a file to zip archive.
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
364 *
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
365 * @param prefix A prefix.
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
366 * @param file The file.
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
367 * @param out The output stream.
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
368 * @throws IOException if an error occured while writing to zip output
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diff changeset
369 * stream.
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
370 */
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
371 private static void copyFileToZip(
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
372 String prefix,
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
373 File file,
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
374 ZipOutputStream out
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
375 )
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
376 throws IOException
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
377 {
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
378 String entryName = prefix + file.getName();
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
379 ZipEntry entry = new ZipEntry(entryName);
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
380 out.putNextEntry(entry);
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
381 InputStream in = null;
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
382 try {
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
383 in =
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
384 new BufferedInputStream(
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
385 new FileInputStream(file), 20*1024);
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
386
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
387 byte [] buf = new byte[2048];
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
388
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
389 int r;
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
390 while ((r = in.read(buf)) > 0) {
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
391 out.write(buf, 0, r);
666417d5781c Inserted a new utility class FileTools to work with files.
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diff changeset
392 }
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
393 }
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
394 finally {
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
395 if (in != null) {
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
396 try { in.close(); }
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
397 catch (IOException ioe) {}
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
398 }
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
399 }
666417d5781c Inserted a new utility class FileTools to work with files.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
400 out.closeEntry();
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
401 }
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
diff changeset
402 }
666417d5781c Inserted a new utility class FileTools to work with files.
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parents:
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403 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org