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86
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1 /* DocuDirectory -- Directory of DocuFilesets.
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 * Created on 25.02.2003
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20 */
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21
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22 package digilib.io;
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23
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24 import java.io.File;
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91
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25 import java.util.ArrayList;
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86
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26 import java.util.Arrays;
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91
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27 import java.util.HashMap;
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28 import java.util.Iterator;
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86
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29
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30 /**
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31 * @author casties
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32 */
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91
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33 public class DocuDirectory {
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86
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34
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91
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35 // list of files
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36 private ArrayList list = null;
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86
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37 // directory object is valid (has been read)
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38 private boolean isValid = false;
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39 // names of base directories
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40 private String[] baseDirNames = null;
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41 // directory name (digilib canonical form)
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42 private String dirName = null;
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43 // default/hires directory
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44 private File dir = null;
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45 // directory metadata
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46 private HashMap dirMeta = null;
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47 // time of last access of this object (not the filesystem)
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48 private long objectATime = 0;
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49 // time the file system directory was last modified
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50 private long dirMTime = 0;
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51
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52 /*
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91
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53 * constructors
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86
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54 */
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55
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56 /** Constructor with directory path and set of base directories.
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57 *
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58 * Reads the directory at the given path appended to the base directories.
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59 *
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60 * @see readDir
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61 *
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62 * @param path digilib directory path name
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63 * @param bd array of base directory names
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64 */
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65 public DocuDirectory(String path, String[] bd) {
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66 dirName = path;
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67 baseDirNames = bd;
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68 readDir();
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69 }
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70
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91
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71 /*
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72 * other stuff
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73 */
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74
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75 public int size() {
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76 return (list != null) ? list.size() : 0;
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77 }
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78
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79 public DocuFileset get(int index) {
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80 return (list != null) ? (DocuFileset) list.get(index) : null;
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81 }
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82
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86
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83 /** Read the directory and fill this object.
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84 *
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85 * Clears the Vector and (re)reads all files.
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86 *
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87 * @return boolean the directory exists
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88 */
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89 public boolean readDir() {
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91
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90 // first file extension to try for scaled directories
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91 String fext = null;
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86
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92 // clear directory first
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91
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93 list = null;
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86
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94 isValid = false;
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95 // number of base dirs
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96 int nb = baseDirNames.length;
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97 // array of base dirs
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98 File[] dirs = new File[nb];
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99 // the first directory has to exist
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100 dir = new File(baseDirNames[0] + dirName);
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101
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102 if (dir.isDirectory()) {
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103 // fill array with the remaining directories
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104 for (int j = 1; j < nb; j++) {
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105 File d = new File(baseDirNames[j] + dirName);
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106 if (d.isDirectory()) {
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107 dirs[j] = d;
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108 }
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109 }
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110
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111 File[] fl = dir.listFiles(new FileOps.ImageFileFilter());
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112 if (fl == null) {
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113 // not a directory
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114 return false;
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115 }
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91
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116 // number of image files in the directory
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117 int nf = fl.length;
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118 if (nf > 0) {
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91
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119 // create new list
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120 list = new ArrayList(nf);
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86
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121
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122 // sort the file names alphabetically and iterate the list
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123 Arrays.sort(fl);
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124 for (int i = 0; i < nf; i++) {
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125 String fn = fl[i].getName();
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126 String fnx =
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127 fn.substring(0, fn.lastIndexOf('.') + 1);
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86
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128 // add the first DocuFile to a new DocuFileset
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129 DocuFileset fs = new DocuFileset(nb);
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130 fs.add(new DocuFile(fl[i]));
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131 // iterate the remaining base directories
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132 for (int j = 1; j < nb; j++) {
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133 if (dirs[j] == null) {
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134 continue;
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135 }
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136 File f;
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137 if (fext != null) {
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138 // use the last extension
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139 f = new File(dirs[j], fnx + fext);
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140 } else {
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141 // try the same filename as the original
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142 f = new File(dirs[j], fn);
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143 }
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144 // if the file exists, add to the DocuFileset
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145 if (f.canRead()) {
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146 fs.add(new DocuFile(f));
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91
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147 } else {
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148 // try other file extensions
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149 Iterator exts = FileOps.getImageExtensionIterator();
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150 while (exts.hasNext()) {
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151 String s = (String) exts.next();
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152 f =
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153 new File(
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154 dirs[j],
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155 fnx + s);
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156 // if the file exists, add to the DocuFileset
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157 if (f.canRead()) {
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158 fs.add(new DocuFile(f));
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159 fext = s;
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160 break;
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161 }
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162 }
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86
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163 }
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164 }
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165 // add the fileset to our list
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166 list.add(fs);
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167 fs.setParent(this);
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168 }
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169 }
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170 dirMTime = dir.lastModified();
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171 isValid = true;
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172 }
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173 return isValid;
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174
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175 }
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176
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177 /** Check to see if the directory has been modified and reread if necessary.
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178 *
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179 * @return boolean the directory is valid
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180 */
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181 public boolean refresh() {
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182 if (isValid) {
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183 if (dir.lastModified() > dirMTime) {
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184 // on-disk modification time is more recent
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185 readDir();
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186 }
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187 touch();
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188 }
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189 return isValid;
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190 }
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191
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192 /** Read directory metadata.
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193 *
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194 */
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195 public void readMeta() {
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196 // check for directory metadata...
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197 }
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198
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199 /** Update access time.
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200 *
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201 * @return long time of last access.
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202 */
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203 public long touch() {
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204 long t = objectATime;
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205 objectATime = System.currentTimeMillis();
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206 return t;
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207 }
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208
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209 /** Searches for the file with the name <code>fn</code>.
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210 *
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211 * Searches the directory for the file with the name <code>fn</code> and returns
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212 * its index. Returns -1 if the file cannot be found.
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213 *
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214 * @param fn filename
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215 * @return int index of file <code>fn</code>
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216 */
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217 public int indexOf(String fn) {
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218 // linear search -> worst performance
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91
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219 int n = list.size();
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220 for (int i = 0; i < n; i++) {
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221 DocuFileset fs = (DocuFileset) list.get(i);
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86
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222 if (fs.getName().equals(fn)) {
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223 return i;
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224 }
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225 }
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226 return -1;
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227 }
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228
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229 /** Finds the DocuFileset with the name <code>fn</code>.
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230 *
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231 * Searches the directory for the DocuFileset with the name <code>fn</code> and returns
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232 * it. Returns null if the file cannot be found.
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233 *
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234 * @param fn filename
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235 * @return DocuFileset
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236 */
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237 public DocuFileset find(String fn) {
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238 int i = indexOf(fn);
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239 if (i >= 0) {
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91
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240 return (DocuFileset) list.get(i);
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86
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241 }
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242 return null;
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243 }
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244
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245 /**
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246 * @return String
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247 */
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248 public String getDirName() {
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249 return dirName;
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250 }
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251
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252 /**
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253 * @return boolean
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254 */
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255 public boolean isValid() {
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256 return isValid;
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257 }
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258
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259 /**
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260 * @return long
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261 */
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262 public long getAccessTime() {
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263 return objectATime;
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264 }
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265
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266 /**
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267 * @return Hashtable
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268 */
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91
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269 public HashMap getDirMeta() {
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86
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270 return dirMeta;
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271 }
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272
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273 /**
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274 * @return long
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275 */
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276 public long getDirMTime() {
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277 return dirMTime;
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278 }
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279
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280 /**
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281 * Sets the dirMeta.
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282 * @param dirMeta The dirMeta to set
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283 */
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91
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284 public void setDirMeta(HashMap dirMeta) {
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86
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285 this.dirMeta = dirMeta;
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286 }
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287
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288 }
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