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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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25 import java.util.Arrays;
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26 import java.util.Collection;
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27 import java.util.Hashtable;
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28 import java.util.Vector;
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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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33 public class DocuDirectory extends Vector {
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34
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35 // directory object is valid (has been read)
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36 private boolean isValid = false;
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37 // names of base directories
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38 private String[] baseDirNames = null;
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39 // directory name (digilib canonical form)
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40 private String dirName = null;
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41 // default/hires directory
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42 private File dir = null;
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43 // directory metadata
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44 private Hashtable dirMeta = null;
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45 // time of last access of this object (not the filesystem)
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46 private long objectATime = 0;
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47 // time the file system directory was last modified
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48 private long dirMTime = 0;
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49
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50 /*
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51 * inherited stuff
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52 */
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53
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54 public DocuDirectory(int initialCapacity, int capacityIncrement) {
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55 super(initialCapacity, capacityIncrement);
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56 }
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57
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58 public DocuDirectory(int initialCapacity) {
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59 super(initialCapacity);
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60 }
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61
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62 public DocuDirectory(Collection c) {
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63 super(c);
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64 }
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65
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66 /*
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67 * new stuff
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68 */
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69
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70 /** Constructor with directory path and set of base directories.
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71 *
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72 * Reads the directory at the given path appended to the base directories.
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73 *
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74 * @see readDir
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75 *
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76 * @param path digilib directory path name
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77 * @param bd array of base directory names
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78 */
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79 public DocuDirectory(String path, String[] bd) {
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80 super();
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81 dirName = path;
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82 baseDirNames = bd;
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83 readDir();
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84 }
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85
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86 /** Read the directory and fill this object.
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87 *
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88 * Clears the Vector and (re)reads all files.
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89 *
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90 * @return boolean the directory exists
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91 */
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92 public boolean readDir() {
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93 // clear directory first
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94 clear();
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95 isValid = false;
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96 // number of base dirs
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97 int nb = baseDirNames.length;
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98 // array of base dirs
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99 File[] dirs = new File[nb];
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100 // the first directory has to exist
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101 dir = new File(baseDirNames[0] + dirName);
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102
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103 if (dir.isDirectory()) {
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104 // fill array with the remaining directories
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105 for (int j = 1; j < nb; j++) {
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106 File d = new File(baseDirNames[j] + dirName);
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107 if (d.isDirectory()) {
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108 dirs[j] = d;
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109 }
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110 }
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111
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112 File[] fl = dir.listFiles(new FileOps.ImageFileFilter());
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113 if (fl == null) {
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114 // not a directory
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115 return false;
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116 }
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117 // number of image files
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118 int nf = fl.length;
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119 if (nf > 0) {
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120 // resize Vector
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121 this.ensureCapacity(nf);
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122
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123 // sort the file names alphabetically and iterate the list
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124 Arrays.sort(fl);
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125 for (int i = 0; i < nf; i++) {
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126 String fn = fl[i].getName();
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127 // add the first DocuFile to a new DocuFileset
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128 DocuFileset fs = new DocuFileset(nb);
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129 fs.add(new DocuFile(fl[i]));
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130 // iterate the remaining base directories
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131 for (int j = 1; j < nb; j++) {
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132 if (dirs[j] == null) {
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133 continue;
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134 }
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135 File f = new File(dirs[j], fn);
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136 // if the file exists, add to the DocuFileset
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137 if (f.canRead()) {
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138 fs.add(new DocuFile(f));
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139 }
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140 }
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141 // add the fileset to our Vector
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142 add(fs);
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143 fs.setParent(this);
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144 }
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145 }
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146 dirMTime = dir.lastModified();
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147 isValid = true;
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148 }
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149 return isValid;
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150
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151 }
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152
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153 /** Check to see if the directory has been modified and reread if necessary.
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154 *
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155 * @return boolean the directory is valid
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156 */
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157 public boolean refresh() {
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158 if (isValid) {
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159 if (dir.lastModified() > dirMTime) {
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160 // on-disk modification time is more recent
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161 readDir();
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162 }
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163 touch();
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164 }
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165 return isValid;
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166 }
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167
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168 /** Read directory metadata.
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169 *
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170 */
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171 public void readMeta() {
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172 // check for directory metadata...
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173 }
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174
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175 /** Update access time.
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176 *
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177 * @return long time of last access.
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178 */
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179 public long touch() {
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180 long t = objectATime;
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181 objectATime = System.currentTimeMillis();
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182 return t;
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183 }
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184
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185 /** Searches for the file with the name <code>fn</code>.
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186 *
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187 * Searches the directory for the file with the name <code>fn</code> and returns
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188 * its index. Returns -1 if the file cannot be found.
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189 *
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190 * @param fn filename
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191 * @return int index of file <code>fn</code>
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192 */
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193 public int indexOf(String fn) {
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194 // linear search -> worst performance
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195 for (int i = 0; i < elementCount; i++) {
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196 DocuFileset fs = (DocuFileset) get(i);
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197 if (fs.getName().equals(fn)) {
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198 return i;
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199 }
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200 }
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201 return -1;
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202 }
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203
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204 /** Finds the DocuFileset with the name <code>fn</code>.
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205 *
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206 * Searches the directory for the DocuFileset with the name <code>fn</code> and returns
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207 * it. Returns null if the file cannot be found.
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208 *
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209 * @param fn filename
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210 * @return DocuFileset
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211 */
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212 public DocuFileset find(String fn) {
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213 int i = indexOf(fn);
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214 if (i >= 0) {
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215 return (DocuFileset) get(i);
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216 }
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217 return null;
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218 }
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219
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220 /**
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221 * @return String
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222 */
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223 public String getDirName() {
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224 return dirName;
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225 }
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226
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227 /**
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228 * @return boolean
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229 */
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230 public boolean isValid() {
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231 return isValid;
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232 }
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233
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234 /**
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235 * @return long
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236 */
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237 public long getAccessTime() {
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238 return objectATime;
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239 }
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240
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241 /**
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242 * @return Hashtable
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243 */
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244 public Hashtable getDirMeta() {
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245 return dirMeta;
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246 }
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247
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248 /**
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249 * @return long
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250 */
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251 public long getDirMTime() {
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252 return dirMTime;
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253 }
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254
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255 /**
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256 * Sets the dirMeta.
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257 * @param dirMeta The dirMeta to set
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258 */
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259 public void setDirMeta(Hashtable dirMeta) {
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260 this.dirMeta = dirMeta;
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261 }
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262
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263 }
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