Mercurial > hg > digilib-old

annotate servlet/src/digilib/io/ImageFileset.java @ 418:2857846b3fd2

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author hertzhaft
date Thu, 22 Dec 2005 11:19:40 +0100
parents ee2b943420f5
children f8ca069517a2
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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.Arrays;
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24 import java.util.Iterator;
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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 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
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42 /** aspect ratio (width/height) */
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43 private float aspect = 0;
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44
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45 /** resolution of the biggest image (DPI) */
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46 private float resX = 0;
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47
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48 /** resolution of the biggest image (DPI) */
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49 private float resY = 0;
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50
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51 /**
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52 * Creator for empty fileset.
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53 *
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54 *
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55 * @param initialCapacity
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56 */
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57 public ImageFileset() {
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58 list = new ArrayList();
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59 }
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60
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61 /**
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62 * Constructor with a file and hints.
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63 *
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64 * The hints are expected to contain 'basedirs' and 'scaledfilext' keys.
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65 *
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66 * @param file
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67 * @param hints
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68 */
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69 public ImageFileset(File file, Map hints) {
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70 Directory[] dirs = (Directory[]) hints.get(FileOps.HINT_BASEDIRS);
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71 int nb = dirs.length;
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72 list = new ArrayList(nb);
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73 parent = dirs[0];
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74 fill(dirs, file, hints);
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75 }
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76
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77 /**
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78 * Adds an ImageFile to this Fileset.
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79 *
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80 * The files should be added in the order of higher to lower resolutions.
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81 * The first file is considered the hires "original".
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82 *
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83 *
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84 * @param f
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85 * file to add
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86 * @return true (always)
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87 */
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88 public boolean add(ImageFile f) {
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89 f.setParent(this);
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90 return list.add(f);
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91 }
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92
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93 /**
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94 * The number of image files in this Fileset.
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95 *
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96 *
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97 * @return number of image files
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98 */
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99 public int size() {
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100 return (list != null) ? list.size() : 0;
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101 }
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102
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103 /**
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104 * Gets the default File.
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105 *
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106 */
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107 public File getFile() {
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108 return (list != null) ? ((ImageFile) list.get(0)).getFile() : null;
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109 }
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110
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111 /**
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112 * Get the ImageFile at the index.
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113 *
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114 *
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115 * @param index
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116 * @return
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117 */
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118 public ImageFile get(int index) {
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119 return (ImageFile) list.get(index);
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120 }
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121
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122 /**
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123 * Get the next smaller ImageFile than the given size.
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124 *
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125 * Returns the ImageFile from the set that has a width and height smaller or
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126 * equal the given size. Returns null if there isn't any smaller image.
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127 * Needs DocuInfo instance to checkFile().
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128 *
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129 *
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130 * @param size
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131 * @param info
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132 * @return
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133 */
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134 public ImageFile getNextSmaller(ImageSize size) {
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135 for (Iterator i = getHiresIterator(); i.hasNext();) {
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136 ImageFile f = (ImageFile) i.next();
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137 try {
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138 if (!f.isChecked()) {
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139 ImageOps.checkFile(f);
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140 }
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141 if (f.getSize().isTotallySmallerThan(size)) {
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142 return f;
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143 }
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144 } catch (IOException e) {
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145 }
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146 }
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147 return null;
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148 }
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149
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150 /**
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151 * Get the next bigger ImageFile than the given size.
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152 *
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153 * Returns the ImageFile from the set that has a width or height bigger or
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154 * equal the given size. Returns null if there isn't any bigger image. Needs
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155 * DocuInfo instance to checkFile().
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156 *
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157 *
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158 * @param size
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159 * @param info
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160 * @return
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161 */
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162 public ImageFile getNextBigger(ImageSize size) {
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163 for (ListIterator i = getLoresIterator(); i.hasPrevious();) {
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164 ImageFile f = (ImageFile) i.previous();
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165 try {
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166 if (!f.isChecked()) {
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167 ImageOps.checkFile(f);
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168 }
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169 if (f.getSize().isBiggerThan(size)) {
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170 return f;
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171 }
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172 } catch (IOException e) {
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173 }
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174 }
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175 return null;
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176 }
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177
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178 /**
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179 * Returns the biggest ImageFile in the set.
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180 *
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181 *
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182 * @return
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183 */
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184 public ImageFile getBiggest() {
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185 return this.get(0);
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186 }
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187
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188 /**
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189 * Returns the biggest ImageFile in the set.
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190 *
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191 *
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192 * @return
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193 */
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194 public ImageFile getSmallest() {
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195 return this.get(this.size() - 1);
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196 }
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197
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198 /**
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199 * Get an Iterator for this Fileset starting at the highest resolution
159
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200 * images.
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201 *
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202 *
159
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203 * @return
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204 */
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205 public ListIterator getHiresIterator() {
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206 return list.listIterator();
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207 }
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208
170
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209 /**
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210 * Get an Iterator for this Fileset starting at the lowest resolution
159
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211 * images.
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212 *
170
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213 * The Iterator starts at the last element, so you have to use it backwards
159
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214 * with hasPrevious() and previous().
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215 *
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216 *
159
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217 * @return
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218 */
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219 public ListIterator getLoresIterator() {
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220 return list.listIterator(list.size());
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221 }
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222
170
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223 /**
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224 * Fill the ImageFileset with files from different base directories.
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225 *
159
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226 *
170
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227 * @param dirs
233
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228 * list of base directories
170
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229 * @param fl
233
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230 * file (from first base dir)
259
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231 * @param hints
284
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232 *
159
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233 */
259
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234 void fill(Directory[] dirs, File fl, Map hints) {
159
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235 int nb = dirs.length;
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236 String fn = fl.getName();
259
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237 String baseFn = FileOps.basename(fn);
170
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238 // add the first ImageFile to the ImageFileset
159
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239 add(new ImageFile(fn, this, parent));
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240 // iterate the remaining base directories
284
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241 for (int dirIdx = 1; dirIdx < nb; dirIdx++) {
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242 if (dirs[dirIdx] == null) {
159
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243 continue;
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244 }
284
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245 // read the directory
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246 if (dirs[dirIdx].getFilenames() == null) {
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247 dirs[dirIdx].readDir();
259
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248 }
284
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249 String[] dirFiles = dirs[dirIdx].getFilenames();
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250 // try the same filename as the original
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251 int fileIdx = Arrays.binarySearch(dirFiles, fn);
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252 if (fileIdx < 0) {
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253 // try closest matches without extension
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254 fileIdx = -fileIdx - 1;
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255 // try idx
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256 if ((fileIdx < dirFiles.length)
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257 && (FileOps.basename(dirFiles[fileIdx]).equals(baseFn))) {
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258 // idx ok
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259 } else if ((fileIdx > 0)
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260 && (FileOps.basename(dirFiles[fileIdx - 1])
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261 .equals(baseFn))) {
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262 // idx-1 ok
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263 fileIdx = fileIdx - 1;
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264 } else if ((fileIdx+1 < dirFiles.length)
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265 && (FileOps.basename(dirFiles[fileIdx + 1])
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266 .equals(baseFn))) {
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267 // idx+1 ok
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268 fileIdx = fileIdx + 1;
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269 } else {
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270 // basename doesn't match
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271 continue;
259
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272 }
159
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273 }
284
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274 if (FileOps.classForFilename(dirFiles[fileIdx]) == FileOps.CLASS_IMAGE) {
295
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275 /* logger.debug("adding file " + dirFiles[fileIdx]
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276 + " to Fileset " + this.getName()); */
284
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277 add(new ImageFile(dirFiles[fileIdx], this, dirs[dirIdx]));
259
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278 }
159
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279 }
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280 }
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281
170
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282 /**
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283 * Checks metadata and sets resolution in resX and resY.
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284 *
159
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285 */
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286 public void checkMeta() {
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287 if (metaChecked) {
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288 return;
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289 }
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290 if (fileMeta == null) {
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291 // try to read metadata file
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292 readMeta();
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293 if (fileMeta == null) {
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294 // try directory metadata
233
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295 ((DocuDirectory) parent).checkMeta();
159
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296 if (((DocuDirectory) parent).getDirMeta() != null) {
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297 fileMeta = ((DocuDirectory) parent).getDirMeta();
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298 } else {
233
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299 // try parent directory metadata
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300 DocuDirectory gp = (DocuDirectory) parent.getParent();
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301 if (gp != null) {
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302 gp.checkMeta();
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303 if (gp.getDirMeta() != null) {
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304 fileMeta = gp.getDirMeta();
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305 }
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306 }
159
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307 }
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308 }
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309 }
354
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310 if (fileMeta == null) {
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311 // no metadata available
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312 metaChecked = true;
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313 return;
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diff changeset
314 }
159
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315 metaChecked = true;
295
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316 float dpi = 0;
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317 float dpix = 0;
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318 float dpiy = 0;
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319 float sizex = 0;
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320 float sizey = 0;
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321 float pixx = 0;
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322 float pixy = 0;
159
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323 // DPI is valid for X and Y
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324 if (fileMeta.containsKey("original-dpi")) {
e743b853efca servlet version 1.16a4
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325 try {
295
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326 dpi = Float.parseFloat((String) fileMeta.get("original-dpi"));
159
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327 } catch (NumberFormatException e) {
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328 }
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329 if (dpi != 0) {
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330 resX = dpi;
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331 resY = dpi;
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332 return;
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333 }
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334 }
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335 // DPI-X and DPI-Y
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336 if (fileMeta.containsKey("original-dpi-x")
233
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diff changeset
337 && fileMeta.containsKey("original-dpi-y")) {
159
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338 try {
295
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339 dpix = Float.parseFloat((String) fileMeta
233
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340 .get("original-dpi-x"));
295
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341 dpiy = Float.parseFloat((String) fileMeta
233
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342 .get("original-dpi-y"));
159
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343 } catch (NumberFormatException e) {
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344 }
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345 if ((dpix != 0) && (dpiy != 0)) {
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346 resX = dpix;
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347 resY = dpiy;
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348 return;
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349 }
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350 }
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351 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y
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352 if (fileMeta.containsKey("original-size-x")
233
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diff changeset
353 && fileMeta.containsKey("original-size-y")
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diff changeset
354 && fileMeta.containsKey("original-pixel-x")
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diff changeset
355 && fileMeta.containsKey("original-pixel-y")) {
159
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356 try {
295
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357 sizex = Float.parseFloat((String) fileMeta
233
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358 .get("original-size-x"));
295
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359 sizey = Float.parseFloat((String) fileMeta
233
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360 .get("original-size-y"));
295
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361 pixx = Float.parseFloat((String) fileMeta
233
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362 .get("original-pixel-x"));
295
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363 pixy = Float.parseFloat((String) fileMeta
233
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364 .get("original-pixel-y"));
159
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365 } catch (NumberFormatException e) {
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366 }
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367 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) {
295
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368 resX = pixx / (sizex * 100 / 2.54f);
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369 resY = pixy / (sizey * 100 / 2.54f);
159
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370 return;
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371 }
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372 }
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373 }
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374
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375 /**
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376 * @return
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377 */
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378 public float getResX() {
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379 return resX;
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380 }
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381
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382 /**
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383 * @return
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384 */
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385 public float getResY() {
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386 return resY;
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387 }
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388
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389 /**
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390 * Sets the aspect ratio from an ImageSize.
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391 *
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392 *
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393 * @param f
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394 */
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395 public void setAspect(ImageSize s) {
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396 aspect = s.getAspect();
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397 }
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398
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399 /**
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400 * Returns the aspect ratio.
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401 *
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402 * Aspect ratio is (width/height). So it's <1 for portrait and >1 for
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403 * landscape.
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404 *
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405 *
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406 * @return
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407 */
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408 public float getAspect() {
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409 return aspect;
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410 }
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411
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412 }