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annotate servlet/src/digilib/io/ImageFileset.java @ 218:0dd38cb2961f

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author robcast
date Tue, 29 Jun 2004 12:08:24 +0200
parents afe7ff98bb71
children e40d8b2e3978
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1 /* ImageFileset -- digilib image file info class.
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2 * Digital Image Library servlet components
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3 * Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)
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4 *
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5 * This program is free software; you can
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6 * redistribute it and/or modify it under the terms of the GNU General Public
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7 * License as published by the Free Software Foundation; either version 2 of
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8 * the License, or (at your option) any later version.
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9 *
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10 * Please read license.txt for the full details. A copy of the GPL may be
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11 * found at http://www.gnu.org/copyleft/lgpl.html
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12 *
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13 * You should have received a copy of the GNU General Public License along
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14 * with this program; if not, write to the Free Software Foundation, Inc.,
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15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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16 */
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17
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18 package digilib.io;
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19
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20 import java.io.File;
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21 import java.io.IOException;
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22 import java.util.ArrayList;
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23 import java.util.Iterator;
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24 import java.util.ListIterator;
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25
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26 import digilib.image.DocuInfo;
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27 import digilib.image.ImageSize;
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28
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29 /**
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30 * @author casties
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31 */
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32 public class ImageFileset extends DocuDirent {
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33
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34 /** this is an image file */
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35 protected static int fileClass = FileOps.CLASS_IMAGE;
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36
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37 /** list of files (ImageFile) */
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38 private ArrayList list = null;
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39 /** aspect ratio (width/height) */
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40 private double aspect = 0;
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41 /** resolution of the biggest image (DPI) */
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42 private double resX = 0;
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43 /** resolution of the biggest image (DPI) */
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44 private double resY = 0;
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45
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46 /**
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47 * Creator for empty fileset with size for file list.
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48 *
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49 *
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50 * @param initialCapacity
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51 */
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52 public ImageFileset(int initialCapacity) {
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53 list = new ArrayList(initialCapacity);
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54 }
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55
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56 /**
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57 * Creator with a file and base directories.
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58 *
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59 * Reads the file and fills the fileset with corresponding files from the
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60 * other base directories. First entry in dirs is the parent of this
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61 * fileset.
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62 *
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63 *
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64 * @see fill
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65 *
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66 * @param dirs
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67 * array of base directories
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68 * @param file
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69 * first file to read
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70 * @param scalext
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71 * extension for scaled images
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72 */
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73 public ImageFileset(Directory[] dirs, File file, String scalext) {
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74 int nb = dirs.length;
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75 list = new ArrayList(nb);
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76 parent = dirs[0];
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77 fill(dirs, file, scalext);
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78 }
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79
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80 /**
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81 * Adds an ImageFile to this Fileset.
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82 *
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83 * The files should be added in the order of higher to lower resolutions.
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84 * The first file is considered the hires "original".
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85 *
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86 *
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87 * @param f
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88 * file to add
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89 * @return true (always)
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90 */
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91 public boolean add(ImageFile f) {
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92 f.setParent(this);
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93 return list.add(f);
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94 }
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95
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96 /**
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97 * The number of image files in this Fileset.
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98 *
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99 *
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100 * @return number of image files
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101 */
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102 public int size() {
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103 return (list != null) ? list.size() : 0;
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104 }
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105
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106 /**
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107 * Gets the default File.
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108 *
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109 */
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110 public File getFile() {
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111 return (list != null) ? ((ImageFile) list.get(0)).getFile() : null;
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112 }
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113
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114 /**
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115 * Get the ImageFile at the index.
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116 *
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117 *
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118 * @param index
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119 * @return
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120 */
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121 public ImageFile get(int index) {
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122 return (ImageFile) list.get(index);
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123 }
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124
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125 /**
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126 * Get the next smaller ImageFile than the given size.
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127 *
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128 * Returns the ImageFile from the set that has a width and height smaller
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129 * or equal the given size. Returns null if there isn't any smaller image.
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130 * Needs DocuInfo instance to checkFile().
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131 *
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132 *
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133 * @param size
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134 * @param info
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135 * @return
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136 */
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137 public ImageFile getNextSmaller(ImageSize size, DocuInfo info) {
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138 for (Iterator i = getHiresIterator(); i.hasNext();) {
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139 ImageFile f = (ImageFile) i.next();
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140 try {
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141 if (!f.isChecked()) {
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142 info.checkFile(f);
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143 }
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144 if (f.getSize().isTotallySmallerThan(size)) {
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145 return f;
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146 }
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147 } catch (IOException e) {
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148 }
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149 }
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150 return null;
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151 }
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152
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153 /**
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154 * Get the next bigger ImageFile than the given size.
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155 *
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156 * Returns the ImageFile from the set that has a width or height bigger or
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157 * equal the given size. Returns null if there isn't any bigger image.
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158 * Needs DocuInfo instance to checkFile().
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159 *
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160 *
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161 * @param size
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162 * @param info
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163 * @return
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164 */
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165 public ImageFile getNextBigger(ImageSize size, DocuInfo info) {
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166 for (ListIterator i = getLoresIterator(); i.hasPrevious();) {
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167 ImageFile f = (ImageFile) i.previous();
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168 try {
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169 if (!f.isChecked()) {
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170 info.checkFile(f);
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171 }
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172 if (f.getSize().isBiggerThan(size)) {
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173 return f;
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174 }
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175 } catch (IOException e) {
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176 }
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177 }
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178 return null;
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179 }
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180
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181 /**
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182 * Returns the biggest ImageFile in the set.
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183 *
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184 *
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185 * @return
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186 */
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187 public ImageFile getBiggest() {
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188 return this.get(0);
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189 }
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191 /**
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192 * Returns the biggest ImageFile in the set.
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193 *
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194 *
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195 * @return
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196 */
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197 public ImageFile getSmallest() {
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198 return this.get(this.size() - 1);
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199 }
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200
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201 /**
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202 * Get an Iterator for this Fileset starting at the highest resolution
159
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203 * images.
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204 *
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205 *
159
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206 * @return
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207 */
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208 public ListIterator getHiresIterator() {
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209 return list.listIterator();
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210 }
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211
170
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212 /**
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213 * Get an Iterator for this Fileset starting at the lowest resolution
159
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214 * images.
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215 *
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216 * The Iterator starts at the last element, so you have to use it backwards
159
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217 * with hasPrevious() and previous().
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218 *
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219 *
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220 * @return
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221 */
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222 public ListIterator getLoresIterator() {
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223 return list.listIterator(list.size());
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224 }
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225
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226 /**
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227 * Fill the ImageFileset with files from different base directories.
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228 *
159
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229 *
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230 * @param dirs
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231 * list of base directories
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232 * @param fl
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233 * file (from first base dir)
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234 * @param scalext
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235 * first extension to try in other base dirs
159
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236 */
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237 void fill(Directory[] dirs, File fl, String scalext) {
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238 int nb = dirs.length;
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239 String fn = fl.getName();
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240 String fnx = fn.substring(0, fn.lastIndexOf('.') + 1);
170
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241 // add the first ImageFile to the ImageFileset
159
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242 add(new ImageFile(fn, this, parent));
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243 // iterate the remaining base directories
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244 for (int j = 1; j < nb; j++) {
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245 if (dirs[j] == null) {
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246 continue;
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247 }
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248 File f;
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249 if (scalext != null) {
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250 // use the last extension
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251 f = new File(dirs[j].getDir(), fnx + scalext);
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252 } else {
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253 // try the same filename as the original
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254 f = new File(dirs[j].getDir(), fn);
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255 }
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256 // if the file exists, add to the ImageFileset
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257 if (f.canRead()) {
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258 add(new ImageFile(f.getName(), this, dirs[j]));
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259 } else {
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260 // try other file extensions
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261 Iterator exts = FileOps.getImageExtensionIterator();
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262 while (exts.hasNext()) {
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263 String s = (String) exts.next();
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264 f = new File(dirs[j].getDir(), fnx + s);
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265 // if the file exists, add to the ImageFileset
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266 if (f.canRead()) {
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267 add(new ImageFile(f.getName(), this, dirs[j]));
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268 scalext = s;
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269 break;
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270 }
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271 }
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272 }
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273 }
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274 }
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275
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276 /**
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277 * Checks metadata and sets resolution in resX and resY.
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278 *
159
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279 */
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280 public void checkMeta() {
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281 if (metaChecked) {
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282 return;
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283 }
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284 if (fileMeta == null) {
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285 // try to read metadata file
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286 readMeta();
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287 if (fileMeta == null) {
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288 // try directory metadata
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289 if (((DocuDirectory) parent).getDirMeta() != null) {
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290 fileMeta = ((DocuDirectory) parent).getDirMeta();
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291 } else {
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292 // no metadata available
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293 metaChecked = true;
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294 return;
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295 }
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296 }
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297 }
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298 metaChecked = true;
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299 String s;
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300 double dpi = 0;
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301 double dpix = 0;
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302 double dpiy = 0;
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303 double sizex = 0;
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304 double sizey = 0;
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305 double pixx = 0;
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306 double pixy = 0;
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307 // DPI is valid for X and Y
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308 if (fileMeta.containsKey("original-dpi")) {
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309 try {
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310 dpi = Double.parseDouble((String) fileMeta.get("original-dpi"));
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311 } catch (NumberFormatException e) {
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312 }
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313 if (dpi != 0) {
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314 resX = dpi;
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315 resY = dpi;
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316 return;
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317 }
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318 }
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319 // DPI-X and DPI-Y
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320 if (fileMeta.containsKey("original-dpi-x")
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321 && fileMeta.containsKey("original-dpi-y")) {
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322 try {
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323 dpix =
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324 Double.parseDouble((String) fileMeta.get("original-dpi-x"));
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325 dpiy =
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326 Double.parseDouble((String) fileMeta.get("original-dpi-y"));
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327 } catch (NumberFormatException e) {
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328 }
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329 if ((dpix != 0) && (dpiy != 0)) {
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330 resX = dpix;
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331 resY = dpiy;
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332 return;
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333 }
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334 }
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335 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y
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336 if (fileMeta.containsKey("original-size-x")
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337 && fileMeta.containsKey("original-size-y")
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338 && fileMeta.containsKey("original-pixel-x")
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339 && fileMeta.containsKey("original-pixel-y")) {
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340 try {
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341 sizex =
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342 Double.parseDouble(
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343 (String) fileMeta.get("original-size-x"));
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344 sizey =
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345 Double.parseDouble(
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346 (String) fileMeta.get("original-size-y"));
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347 pixx =
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348 Double.parseDouble(
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349 (String) fileMeta.get("original-pixel-x"));
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350 pixy =
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351 Double.parseDouble(
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352 (String) fileMeta.get("original-pixel-y"));
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353 } catch (NumberFormatException e) {
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354 }
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355 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) {
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356 resX = pixx / (sizex * 100 / 2.54);
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357 resY = pixy / (sizey * 100 / 2.54);
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358 return;
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359 }
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360 }
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361 }
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362
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363 /**
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364 * @return
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365 */
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366 public double getResX() {
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367 return resX;
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368 }
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369
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370 /**
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371 * @return
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372 */
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373 public double getResY() {
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374 return resY;
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375 }
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376
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377 /**
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378 * Sets the aspect ratio from an ImageSize.
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379 *
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380 *
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381 * @param f
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382 */
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383 public void setAspect(ImageSize s) {
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384 aspect = s.getAspect();
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385 }
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386
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387 /**
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388 * Returns the aspect ratio.
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389 *
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390 * Aspect ratio is (width/height). So it's <1 for portrait and >1 for
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391 * landscape.
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392 *
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393 *
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394 * @return
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395 */
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396 public double getAspect() {
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397 return aspect;
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398 }
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399
159
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400 }