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159
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1 /* ImageFileset -- digilib image file info class.
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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 */
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20 package digilib.io;
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21
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.util.ArrayList;
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25 import java.util.Iterator;
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26 import java.util.ListIterator;
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27
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28 import digilib.image.DocuInfo;
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29 import digilib.image.ImageSize;
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30
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31 /**
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32 * @author casties
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33 */
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34 public class ImageFileset extends DocuDirent {
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35
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36 // this is an image file
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37 protected static int fileClass = FileOps.CLASS_IMAGE;
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38
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39 // list of files (ImageFile)
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40 private ArrayList list = null;
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41 // resolution (DPI)
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42 private double resX = 0;
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43 private double resY = 0;
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44
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45 /** Creator for empty fileset with size for file list.
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46 *
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47 * @param initialCapacity
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48 */
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49 public ImageFileset(int initialCapacity) {
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50 list = new ArrayList(initialCapacity);
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51 }
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52
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53 /** Creator with a file and base directories.
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54 *
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55 * Reads the file and fills the
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56 * fileset with corresponding files from the other base directories.
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57 * First entry in dirs is the parent of this fileset.
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58 *
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59 * @see fill
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60 *
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61 * @param dirs array of base directories
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62 * @param file first file to read
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63 * @param scalext extension for scaled images
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64 */
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65 public ImageFileset(Directory[] dirs, File file, String scalext) {
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66 int nb = dirs.length;
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67 list = new ArrayList(nb);
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68 parent = dirs[0];
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69 fill(dirs, file, scalext);
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70 }
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71
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72 /** Adds a ImageFile to this Fileset.
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73 *
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74 * The files should be added in the order of higher to lower resolutions.
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75 * The first file is considered the hires "original".
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76 *
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77 * @param f file to add
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78 * @return true (always)
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79 */
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80 public boolean add(ImageFile f) {
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81 f.setParent(this);
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82 return list.add(f);
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83 }
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84
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85 /** The number of image files in this Fileset.
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86 *
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87 * @return number of image files
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88 */
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89 public int size() {
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90 return (list != null) ? list.size() : 0;
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91 }
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92
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93 /** Gets the default File.
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94 *
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95 */
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96 public File getFile() {
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97 return (list != null) ? ((ImageFile) list.get(0)).getFile() : null;
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98 }
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99
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100 /** Get the ImageFile at the index.
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101 *
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102 * @param index
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103 * @return
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104 */
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105 public ImageFile get(int index) {
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106 return (ImageFile) list.get(index);
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107 }
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108
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109 /** Get the next smaller ImageFile than the given size.
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110 *
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111 * Returns the ImageFile from the set that has a width and height
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112 * smaller or equal the given size.
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113 * Returns null if there isn't any smaller image.
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114 * Needs DocuInfo instance to checkFile().
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115 *
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116 * @param size
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117 * @param info
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118 * @return
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119 */
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120 public ImageFile getNextSmaller(ImageSize size, DocuInfo info) {
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121 for (Iterator i = getHiresIterator(); i.hasNext();) {
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122 ImageFile f = (ImageFile) i.next();
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123 try {
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124 if (!f.isChecked()) {
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125 info.checkFile(f);
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126 }
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127 if (f.getSize().isTotallySmallerThan(size)) {
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128 return f;
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129 }
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130 } catch (IOException e) {
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131 // TODO Auto-generated catch block
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132 e.printStackTrace();
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133 }
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134 }
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135 return null;
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136 }
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137
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138 /** Get the next bigger ImageFile than the given size.
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139 *
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140 * Returns the ImageFile from the set that has a width or height
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141 * bigger or equal the given size.
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142 * Returns null if there isn't any bigger image.
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143 * Needs DocuInfo instance to checkFile().
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144 *
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145 * @param size
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146 * @param info
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147 * @return
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148 */
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149 public ImageFile getNextBigger(ImageSize size, DocuInfo info) {
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150 for (ListIterator i = getLoresIterator(); i.hasPrevious();) {
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151 ImageFile f = (ImageFile) i.previous();
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152 try {
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153 if (!f.isChecked()) {
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154 info.checkFile(f);
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155 }
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156 if (f.getSize().isBiggerThan(size)) {
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157 return f;
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158 }
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159 } catch (IOException e) {
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160 // TODO Auto-generated catch block
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161 e.printStackTrace();
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162 }
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163 }
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164 return null;
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165 }
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166
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167 /** Get an Iterator for this Fileset starting at the highest resolution
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168 * images.
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169 *
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170 * @return
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171 */
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172 public ListIterator getHiresIterator() {
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173 return list.listIterator();
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174 }
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175
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176 /** Get an Iterator for this Fileset starting at the lowest resolution
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177 * images.
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178 *
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179 * The Iterator starts at the last element, so you have to use it backwards
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180 * with hasPrevious() and previous().
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181 *
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182 * @return
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183 */
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184 public ListIterator getLoresIterator() {
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185 return list.listIterator(list.size());
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186 }
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187
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188 /** Fill the ImageFileset with files from different base directories.
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189 *
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190 * @param dirs list of base directories
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191 * @param fl file (from first base dir)
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192 * @param scalext first extension to try in other base dirs
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193 */
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194 void fill(Directory[] dirs, File fl, String scalext) {
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195 int nb = dirs.length;
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196 String fn = fl.getName();
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197 String fnx = fn.substring(0, fn.lastIndexOf('.') + 1);
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198 // add the first ImageFile to the ImageFileset
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199 add(new ImageFile(fn, this, parent));
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200 // iterate the remaining base directories
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201 for (int j = 1; j < nb; j++) {
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202 if (dirs[j] == null) {
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203 continue;
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204 }
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205 File f;
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206 if (scalext != null) {
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207 // use the last extension
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208 f = new File(dirs[j].getDir(), fnx + scalext);
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209 } else {
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210 // try the same filename as the original
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211 f = new File(dirs[j].getDir(), fn);
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212 }
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213 // if the file exists, add to the ImageFileset
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214 if (f.canRead()) {
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215 add(new ImageFile(f.getName(), this, dirs[j]));
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216 } else {
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217 // try other file extensions
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218 Iterator exts = FileOps.getImageExtensionIterator();
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219 while (exts.hasNext()) {
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220 String s = (String) exts.next();
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221 f = new File(dirs[j].getDir(), fnx + s);
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222 // if the file exists, add to the ImageFileset
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223 if (f.canRead()) {
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224 add(new ImageFile(f.getName(), this, dirs[j]));
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225 scalext = s;
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226 break;
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227 }
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228 }
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229 }
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230 }
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231 }
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232
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233 /** Checks metadata and sets resolution in resX and resY.
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234 *
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235 */
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236 public void checkMeta() {
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237 if (metaChecked) {
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238 return;
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239 }
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240 if (fileMeta == null) {
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241 // try to read metadata file
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242 readMeta();
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243 if (fileMeta == null) {
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244 // try directory metadata
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245 if (((DocuDirectory) parent).getDirMeta() != null) {
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246 fileMeta = ((DocuDirectory) parent).getDirMeta();
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247 } else {
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248 // no metadata available
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249 metaChecked = true;
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250 return;
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251 }
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252 }
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253 }
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254 metaChecked = true;
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255 String s;
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256 double dpi = 0;
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257 double dpix = 0;
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258 double dpiy = 0;
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259 double sizex = 0;
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260 double sizey = 0;
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261 double pixx = 0;
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262 double pixy = 0;
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263 // DPI is valid for X and Y
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264 if (fileMeta.containsKey("original-dpi")) {
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265 try {
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266 dpi = Double.parseDouble((String) fileMeta.get("original-dpi"));
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267 } catch (NumberFormatException e) {
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268 }
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269 if (dpi != 0) {
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270 resX = dpi;
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271 resY = dpi;
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272 return;
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273 }
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274 }
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275 // DPI-X and DPI-Y
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276 if (fileMeta.containsKey("original-dpi-x")
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277 && fileMeta.containsKey("original-dpi-y")) {
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278 try {
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279 dpix =
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280 Double.parseDouble((String) fileMeta.get("original-dpi-x"));
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281 dpiy =
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282 Double.parseDouble((String) fileMeta.get("original-dpi-y"));
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283 } catch (NumberFormatException e) {
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284 }
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285 if ((dpix != 0) && (dpiy != 0)) {
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286 resX = dpix;
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287 resY = dpiy;
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288 return;
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289 }
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290 }
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291 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y
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292 if (fileMeta.containsKey("original-size-x")
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293 && fileMeta.containsKey("original-size-y")
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294 && fileMeta.containsKey("original-pixel-x")
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295 && fileMeta.containsKey("original-pixel-y")) {
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296 try {
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297 sizex =
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298 Double.parseDouble(
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299 (String) fileMeta.get("original-size-x"));
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300 sizey =
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301 Double.parseDouble(
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302 (String) fileMeta.get("original-size-y"));
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303 pixx =
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304 Double.parseDouble(
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305 (String) fileMeta.get("original-pixel-x"));
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306 pixy =
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307 Double.parseDouble(
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308 (String) fileMeta.get("original-pixel-y"));
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309 } catch (NumberFormatException e) {
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310 }
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311 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) {
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312 resX = pixx / (sizex * 100 / 2.54);
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313 resY = pixy / (sizey * 100 / 2.54);
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314 return;
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315 }
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316 }
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317 }
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318
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319 /**
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320 * @return
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321 */
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322 public double getResX() {
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323 return resX;
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324 }
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325
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326 /**
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327 * @return
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328 */
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329 public double getResY() {
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330 return resY;
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331 }
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332
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333 }
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