annotate servlet/src/digilib/io/ImageFileset.java @ 273:d4c0c4d858a9

Servlet version 1.21b3 - searching in directories got faster (real binarySearch now!) - cached file lists get disposed - some code cleaning (Map types instead of HashMap)
author robcast
date Tue, 12 Oct 2004 16:06:43 +0200
parents beed92ee6022
children c633e97cac12
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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.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
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42 /** aspect ratio (width/height) */
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43 private double aspect = 0;
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44
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45 /** resolution of the biggest image (DPI) */
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46 private double resX = 0;
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47
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48 /** resolution of the biggest image (DPI) */
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49 private double 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 /**
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79 * Adds an ImageFile to this Fileset.
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80 *
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81 * The files should be added in the order of higher to lower resolutions.
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82 * The first file is considered the hires "original".
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83 *
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84 *
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85 * @param f
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86 * file to add
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87 * @return true (always)
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88 */
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89 public boolean add(ImageFile f) {
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90 f.setParent(this);
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91 return list.add(f);
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92 }
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93
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94 /**
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95 * The number of image files in this Fileset.
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96 *
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97 *
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98 * @return number of image files
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99 */
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100 public int size() {
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101 return (list != null) ? list.size() : 0;
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102 }
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103
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104 /**
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105 * Gets the default File.
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106 *
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107 */
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108 public File getFile() {
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109 return (list != null) ? ((ImageFile) list.get(0)).getFile() : null;
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110 }
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111
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112 /**
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113 * Get the ImageFile at the index.
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114 *
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115 *
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116 * @param index
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117 * @return
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118 */
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119 public ImageFile get(int index) {
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120 return (ImageFile) list.get(index);
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121 }
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122
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123 /**
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124 * Get the next smaller ImageFile than the given size.
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125 *
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126 * Returns the ImageFile from the set that has a width and height smaller or
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127 * equal the given size. Returns null if there isn't any smaller image.
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128 * Needs DocuInfo instance to checkFile().
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129 *
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130 *
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131 * @param size
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132 * @param info
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133 * @return
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134 */
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135 public ImageFile getNextSmaller(ImageSize size, DocuInfo info) {
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136 for (Iterator i = getHiresIterator(); i.hasNext();) {
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137 ImageFile f = (ImageFile) i.next();
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138 try {
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139 if (!f.isChecked()) {
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140 info.checkFile(f);
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141 }
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142 if (f.getSize().isTotallySmallerThan(size)) {
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143 return f;
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144 }
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145 } catch (IOException e) {
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146 }
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147 }
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148 return null;
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149 }
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150
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151 /**
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152 * Get the next bigger ImageFile than the given size.
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153 *
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154 * Returns the ImageFile from the set that has a width or height bigger or
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155 * equal the given size. Returns null if there isn't any bigger image. Needs
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156 * DocuInfo instance to checkFile().
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157 *
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158 *
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159 * @param size
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160 * @param info
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161 * @return
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162 */
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163 public ImageFile getNextBigger(ImageSize size, DocuInfo info) {
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164 for (ListIterator i = getLoresIterator(); i.hasPrevious();) {
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165 ImageFile f = (ImageFile) i.previous();
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166 try {
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167 if (!f.isChecked()) {
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168 info.checkFile(f);
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169 }
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170 if (f.getSize().isBiggerThan(size)) {
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171 return f;
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172 }
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173 } catch (IOException e) {
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174 }
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175 }
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176 return null;
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177 }
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178
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179 /**
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180 * Returns the biggest ImageFile in the set.
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181 *
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182 *
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183 * @return
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184 */
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185 public ImageFile getBiggest() {
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186 return this.get(0);
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187 }
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188
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189 /**
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190 * Returns the biggest ImageFile in the set.
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191 *
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192 *
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193 * @return
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194 */
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195 public ImageFile getSmallest() {
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196 return this.get(this.size() - 1);
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197 }
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198
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199 /**
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200 * Get an Iterator for this Fileset starting at the highest resolution
159
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201 * images.
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202 *
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203 *
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204 * @return
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205 */
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206 public ListIterator getHiresIterator() {
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207 return list.listIterator();
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208 }
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209
170
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210 /**
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211 * Get an Iterator for this Fileset starting at the lowest resolution
159
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212 * images.
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213 *
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214 * The Iterator starts at the last element, so you have to use it backwards
159
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215 * with hasPrevious() and previous().
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216 *
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217 *
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218 * @return
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219 */
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220 public ListIterator getLoresIterator() {
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221 return list.listIterator(list.size());
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222 }
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223
170
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224 /**
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225 * Fill the ImageFileset with files from different base directories.
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226 *
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227 *
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228 * @param dirs
233
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229 * list of base directories
170
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230 * @param fl
233
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231 * file (from first base dir)
259
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232 * @param hints
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233 *
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234 */
259
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235 void fill(Directory[] dirs, File fl, Map hints) {
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236 String scalext = (String) hints.get(FileOps.HINT_FILEEXT);
159
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237 int nb = dirs.length;
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238 String fn = fl.getName();
259
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239 String baseFn = FileOps.basename(fn);
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240 // add the first ImageFile to the ImageFileset
159
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241 add(new ImageFile(fn, this, parent));
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242 // iterate the remaining base directories
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243 for (int j = 1; j < nb; j++) {
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244 if (dirs[j] == null) {
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245 continue;
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246 }
259
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247 // read the directories
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248 if (dirs[j].getFilenames() == null) {
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249 dirs[j].readDir();
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250 }
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251 File f = null;
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252 String[] dirFiles = dirs[j].getFilenames();
159
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253 if (scalext != null) {
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254 // use the last extension
259
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255 int i = Arrays.binarySearch(dirFiles, baseFn + scalext);
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256 if (i >= 0) {
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257 f = new File(dirs[j].getDir(), dirFiles[i]);
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258 }
159
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259 } else {
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260 // try the same filename as the original
259
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261 int i = Arrays.binarySearch(dirFiles, fn);
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262 if (i >= 0) {
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263 f = new File(dirs[j].getDir(), dirFiles[i]);
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264 }
159
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265 }
259
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266 // if the file doesn't exists, try other file extensions
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267 if (f == null) {
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268 // try other file extensions
259
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269 for (Iterator exts = FileOps.getImageExtensionIterator(); exts.hasNext();) {
159
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270 String s = (String) exts.next();
259
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271 int i = Arrays.binarySearch(dirFiles, baseFn + s);
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272 if (i >= 0) {
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273 hints.put(FileOps.HINT_FILEEXT, s);
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274 f = new File(dirs[j].getDir(), dirFiles[i]);
159
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275 break;
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276 }
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277 }
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278 }
259
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279 if (f != null) {
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280 add(new ImageFile(f.getName(), this, dirs[j]));
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281 }
159
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282 }
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283 }
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284
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285 /**
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286 * Checks metadata and sets resolution in resX and resY.
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287 *
159
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288 */
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289 public void checkMeta() {
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290 if (metaChecked) {
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291 return;
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292 }
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293 if (fileMeta == null) {
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294 // try to read metadata file
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295 readMeta();
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296 if (fileMeta == null) {
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297 // try directory metadata
233
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298 ((DocuDirectory) parent).checkMeta();
159
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299 if (((DocuDirectory) parent).getDirMeta() != null) {
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300 fileMeta = ((DocuDirectory) parent).getDirMeta();
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301 } else {
233
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302 // try parent directory metadata
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303 DocuDirectory gp = (DocuDirectory) parent.getParent();
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304 if (gp != null) {
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305 gp.checkMeta();
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306 if (gp.getDirMeta() != null) {
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307 fileMeta = gp.getDirMeta();
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308 } else {
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309 // no metadata available
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310 metaChecked = true;
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311 return;
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312 }
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313 }
159
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314 }
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315 }
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316 }
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317 metaChecked = true;
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318 String s;
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319 double dpi = 0;
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320 double dpix = 0;
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321 double dpiy = 0;
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322 double sizex = 0;
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323 double sizey = 0;
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324 double pixx = 0;
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325 double pixy = 0;
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326 // DPI is valid for X and Y
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327 if (fileMeta.containsKey("original-dpi")) {
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328 try {
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329 dpi = Double.parseDouble((String) fileMeta.get("original-dpi"));
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330 } catch (NumberFormatException e) {
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331 }
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332 if (dpi != 0) {
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333 resX = dpi;
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334 resY = dpi;
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335 return;
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336 }
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337 }
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338 // DPI-X and DPI-Y
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339 if (fileMeta.containsKey("original-dpi-x")
233
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340 && fileMeta.containsKey("original-dpi-y")) {
159
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341 try {
233
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342 dpix = Double.parseDouble((String) fileMeta
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343 .get("original-dpi-x"));
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344 dpiy = Double.parseDouble((String) fileMeta
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345 .get("original-dpi-y"));
159
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346 } catch (NumberFormatException e) {
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347 }
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348 if ((dpix != 0) && (dpiy != 0)) {
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349 resX = dpix;
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350 resY = dpiy;
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351 return;
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352 }
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353 }
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354 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y
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355 if (fileMeta.containsKey("original-size-x")
233
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356 && fileMeta.containsKey("original-size-y")
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357 && fileMeta.containsKey("original-pixel-x")
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358 && fileMeta.containsKey("original-pixel-y")) {
159
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359 try {
233
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360 sizex = Double.parseDouble((String) fileMeta
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361 .get("original-size-x"));
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362 sizey = Double.parseDouble((String) fileMeta
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363 .get("original-size-y"));
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364 pixx = Double.parseDouble((String) fileMeta
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365 .get("original-pixel-x"));
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366 pixy = Double.parseDouble((String) fileMeta
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367 .get("original-pixel-y"));
159
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368 } catch (NumberFormatException e) {
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369 }
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370 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) {
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371 resX = pixx / (sizex * 100 / 2.54);
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372 resY = pixy / (sizey * 100 / 2.54);
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373 return;
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374 }
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375 }
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376 }
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377
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378 /**
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379 * @return
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380 */
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381 public double getResX() {
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382 return resX;
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383 }
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384
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385 /**
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386 * @return
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387 */
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388 public double getResY() {
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389 return resY;
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390 }
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391
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392 /**
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393 * Sets the aspect ratio from an ImageSize.
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394 *
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395 *
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396 * @param f
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397 */
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398 public void setAspect(ImageSize s) {
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399 aspect = s.getAspect();
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400 }
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401
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402 /**
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403 * Returns the aspect ratio.
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404 *
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405 * Aspect ratio is (width/height). So it's <1 for portrait and >1 for
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406 * landscape.
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407 *
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408 *
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409 * @return
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410 */
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411 public double getAspect() {
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412 return aspect;
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413 }
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414
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415 }