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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.List;
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25 import java.util.ListIterator;
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26 import java.util.Map;
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27
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28 import digilib.image.ImageOps;
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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 DigiDirent {
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35
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36 /** this is an image file */
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37 protected static int FILE_CLASS = FileOps.CLASS_IMAGE;
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38
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39 /** list of files (ImageFile) */
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40 private List files;
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41
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42 /** resolution of the biggest image (DPI) */
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43 private float resX = 0;
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44
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45 /** resolution of the biggest image (DPI) */
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46 private float resY = 0;
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47
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48 /**
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49 * Constructor with a file and hints.
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50 *
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51 * The hints are expected to contain 'basedirs' and 'scaledfilext' keys.
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52 *
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53 * @param file
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54 * @param hints
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55 */
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56 public ImageFileset(File file, DigiDirectory parent, Map hints) {
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57 super(file.getName(), parent);
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58 files = new ArrayList(FileOps.getBaseDirs().length);
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59 fill(file, hints);
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60 }
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61
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62 /**
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63 * Gets the default File.
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64 *
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65 */
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66 public ImageFile getFile() {
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67 return (files != null) ? (ImageFile) files.get(0) : null;
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68 }
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69
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70 /**
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71 * Get the ImageFile at the index.
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72 *
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73 *
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74 * @param index
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75 * @return
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76 */
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77 public ImageFile get(int index) {
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78 return (files != null) ? (ImageFile) files.get(index) : null;
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79 }
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80
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81 /**
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82 * Get the next smaller ImageFile than the given size.
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83 *
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84 * Returns the ImageFile from the set that has a width and height smaller or
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85 * equal the given size. Returns null if there isn't any smaller image.
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86 * Needs DocuInfo instance to checkFile().
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87 *
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88 *
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89 * @param size
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90 * @param info
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91 * @return
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92 */
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93 public ImageFile getNextSmaller(ImageSize size) {
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94 for (Iterator i = getHiresIterator(); i.hasNext();) {
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95 ImageFile f = (ImageFile) i.next();
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96 try {
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97 ImageOps.checkFile(f);
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98 if (f.getSize().isTotallySmallerThan(size)) {
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99 return f;
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100 }
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101 } catch (IOException e) {
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102 }
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103 }
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104 return null;
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105 }
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106
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107 /**
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108 * Get the next bigger ImageFile than the given size.
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109 *
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110 * Returns the ImageFile from the set that has a width or height bigger or
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111 * equal the given size. Returns null if there isn't any bigger image. Needs
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112 * DocuInfo instance to checkFile().
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113 *
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114 *
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115 * @param size
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116 * @param info
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117 * @return
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118 */
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119 public ImageFile getNextBigger(ImageSize size) {
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120 for (ListIterator i = getLoresIterator(); i.hasPrevious();) {
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121 ImageFile f = (ImageFile) i.previous();
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122 try {
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123 ImageOps.checkFile(f);
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124 if (f.getSize().isBiggerThan(size)) {
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125 return f;
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126 }
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127 } catch (IOException e) {
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128 }
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129 }
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130 return null;
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131 }
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132
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133 /**
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134 * Returns the biggest ImageFile in the set.
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135 *
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136 *
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137 * @return
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138 */
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139 public ImageFile getBiggest() {
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140 return (ImageFile) files.get(0);
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141 }
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142
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143 /**
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144 * Returns the biggest ImageFile in the set.
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145 *
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146 *
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147 * @return
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148 */
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149 public ImageFile getSmallest() {
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150 return (ImageFile) files.get(files.size() - 1);
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151 }
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152
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153 /**
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154 * Get an Iterator for this Fileset starting at the highest resolution
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155 * images.
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156 *
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157 *
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158 * @return
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159 */
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160 public ListIterator getHiresIterator() {
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161 return files.listIterator();
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162 }
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163
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164 /**
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165 * Get an Iterator for this Fileset starting at the lowest resolution
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166 * images.
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167 *
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168 * The Iterator starts at the last element, so you have to use it backwards
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169 * with hasPrevious() and previous().
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170 *
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171 *
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172 * @return
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173 */
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174 public ListIterator getLoresIterator() {
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175 return files.listIterator(files.size());
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176 }
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177
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178 /**
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179 * Fill the ImageFileset with files from different base directories.
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180 *
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181 *
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182 * @param dirs
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183 * list of base directories
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184 * @param imf
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185 * file (from first base dir)
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186 * @param hints
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187 *
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188 */
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189 void fill(File imf, Map hints) {
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190 File[][] scaledirs = (File[][]) hints.get(FileOps.HINT_BASEDIRS);
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191 File[] bd = FileOps.getBaseDirs();
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192 int nb = bd.length;
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193 if (scaledirs == null) {
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194 // read all scaled directories
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195 scaledirs = new File[nb][];
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196 for (int i = 1; i < nb; i++) {
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197 // check basedir + digilib path
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198 File d = FileOps.getRealFile(bd[i], parent.getDLPath());
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199 scaledirs[i] = d.listFiles();
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200 }
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201 hints.put(FileOps.HINT_BASEDIRS, scaledirs);
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202 }
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203 // add the first ImageFile to the ImageFileset
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204 files.add(new ImageFile(imf));
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205 // iterate the remaining base directories
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206 for (int dirIdx = 1; dirIdx < nb; dirIdx++) {
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207 if (scaledirs[dirIdx] == null) {
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208 continue;
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209 }
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210 // find the file in the directory
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211 File fn = FileOps.findFile(imf, scaledirs[dirIdx]);
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212 if (fn == null) {
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213 continue;
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214 }
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215 if (FileOps.classForFile(fn) == FileOps.CLASS_IMAGE) {
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216 // add to the fileset
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217 files.add(new ImageFile(fn));
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218 }
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219 }
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220 }
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221
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222 /**
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223 * Reads metadata and sets resolution in resX and resY.
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224 *
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225 */
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226 public void readMeta() {
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227 if (isMetaRead) {
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228 return;
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229 }
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230 // read the metadata file
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231 super.readMeta();
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232 if (meta == null) {
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233 // try directory metadata
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234 meta = parent.getMeta();
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235 if (meta == null) {
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236 // no metadata available
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237 isMetaRead = true;
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238 return;
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239 }
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240 }
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241 isMetaRead = true;
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242 String s;
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243 float dpi = 0;
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244 float dpix = 0;
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245 float dpiy = 0;
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246 float sizex = 0;
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247 float sizey = 0;
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248 float pixx = 0;
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249 float pixy = 0;
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250 // DPI is valid for X and Y
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251 if (meta.containsKey("original-dpi")) {
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252 try {
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253 dpi = Float.parseFloat((String) meta.get("original-dpi"));
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254 } catch (NumberFormatException e) {
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255 }
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256 if (dpi != 0) {
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257 resX = dpi;
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258 resY = dpi;
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259 return;
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260 }
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261 }
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262 // DPI-X and DPI-Y
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263 if (meta.containsKey("original-dpi-x")
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264 && meta.containsKey("original-dpi-y")) {
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265 try {
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266 dpix = Float.parseFloat((String) meta.get("original-dpi-x"));
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267 dpiy = Float.parseFloat((String) meta.get("original-dpi-y"));
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268 } catch (NumberFormatException e) {
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269 }
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270 if ((dpix != 0) && (dpiy != 0)) {
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271 resX = dpix;
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272 resY = dpiy;
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273 return;
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274 }
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275 }
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276 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y
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277 if (meta.containsKey("original-size-x")
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278 && meta.containsKey("original-size-y")
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279 && meta.containsKey("original-pixel-x")
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280 && meta.containsKey("original-pixel-y")) {
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281 try {
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282 sizex = Float.parseFloat((String) meta.get("original-size-x"));
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283 sizey = Float.parseFloat((String) meta.get("original-size-y"));
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284 pixx = Float.parseFloat((String) meta.get("original-pixel-x"));
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285 pixy = Float.parseFloat((String) meta.get("original-pixel-y"));
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286 } catch (NumberFormatException e) {
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287 }
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288 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) {
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289 resX = pixx / (sizex * 100 / 2.54f);
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290 resY = pixy / (sizey * 100 / 2.54f);
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291 return;
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292 }
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293 }
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294 }
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295
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296 /**
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297 * Returns the aspect ratio of the images.
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298 *
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299 * @return
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300 */
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301 public float getAspect() {
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302 for (Iterator i = files.iterator(); i.hasNext();) {
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303 ImageFile f = (ImageFile) i.next();
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304 ImageSize s = f.getSize();
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305 if (s != null) {
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306 return s.getAspect();
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307 }
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308 }
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309 return 0f;
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310 }
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311
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312 /**
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313 * @return
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314 */
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315 public float getResX() {
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316 return resX;
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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 float getResY() {
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323 return resY;
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324 }
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325
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326 } |
