Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/services/AbstractChartService.java @ 5866:9a6741ccf6d4
FLYS artifacts: Renamed FLYSContext(Factory) to RiverContext(Factory).
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 28 Apr 2013 15:14:30 +0200 |
parents | 4897a58c8746 |
children | af13ceeba52a |
rev | line source |
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River artifacts: Added new copyright headers.
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.services; |
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10 |
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11 import java.awt.Dimension; |
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12 import java.awt.Transparency; |
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13 import java.awt.image.BufferedImage; |
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14 import java.io.ByteArrayOutputStream; |
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15 import java.io.IOException; |
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16 |
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17 import javax.imageio.ImageIO; |
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18 |
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19 import org.apache.log4j.Logger; |
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20 import org.jfree.chart.JFreeChart; |
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21 import org.w3c.dom.Document; |
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22 import org.w3c.dom.Element; |
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23 import org.w3c.dom.NodeList; |
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24 |
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25 import org.dive4elements.artifactdatabase.DefaultService; |
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26 import org.dive4elements.artifacts.CallMeta; |
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27 import org.dive4elements.artifacts.GlobalContext; |
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28 import org.dive4elements.artifacts.Service; |
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29 |
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30 /** Serve chart. */ |
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31 public abstract class AbstractChartService extends DefaultService { |
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32 |
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33 public static final int DEFAULT_WIDTH = 240; |
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34 public static final int DEFAULT_HEIGHT = 180; |
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35 |
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36 public static final String DEFAULT_FORMAT = "png"; |
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37 |
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38 private static final Logger log = Logger |
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39 .getLogger(AbstractChartService.class); |
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40 |
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41 // TODO: Load fancy image from resources. |
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42 public static final byte[] EMPTY = { (byte) 0x89, (byte) 0x50, (byte) 0x4e, |
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43 (byte) 0x47, (byte) 0x0d, (byte) 0x0a, (byte) 0x1a, (byte) 0x0a, |
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44 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x0d, (byte) 0x49, |
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45 (byte) 0x48, (byte) 0x44, (byte) 0x52, (byte) 0x00, (byte) 0x00, |
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46 (byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00, (byte) 0x00, |
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47 (byte) 0x01, (byte) 0x08, (byte) 0x00, (byte) 0x00, (byte) 0x00, |
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48 (byte) 0x00, (byte) 0x3a, (byte) 0x7e, (byte) 0x9b, (byte) 0x55, |
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49 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x73, |
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50 (byte) 0x52, (byte) 0x47, (byte) 0x42, (byte) 0x00, (byte) 0xae, |
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51 (byte) 0xce, (byte) 0x1c, (byte) 0xe9, (byte) 0x00, (byte) 0x00, |
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52 (byte) 0x00, (byte) 0x09, (byte) 0x70, (byte) 0x48, (byte) 0x59, |
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53 (byte) 0x73, (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, |
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54 (byte) 0x00, (byte) 0x00, (byte) 0x0b, (byte) 0x13, (byte) 0x01, |
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55 (byte) 0x00, (byte) 0x9a, (byte) 0x9c, (byte) 0x18, (byte) 0x00, |
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56 (byte) 0x00, (byte) 0x00, (byte) 0x07, (byte) 0x74, (byte) 0x49, |
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57 (byte) 0x4d, (byte) 0x45, (byte) 0x07, (byte) 0xdc, (byte) 0x04, |
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58 (byte) 0x04, (byte) 0x10, (byte) 0x30, (byte) 0x15, (byte) 0x7d, |
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59 (byte) 0x77, (byte) 0x36, (byte) 0x0b, (byte) 0x00, (byte) 0x00, |
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60 (byte) 0x00, (byte) 0x08, (byte) 0x74, (byte) 0x45, (byte) 0x58, |
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61 (byte) 0x74, (byte) 0x43, (byte) 0x6f, (byte) 0x6d, (byte) 0x6d, |
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62 (byte) 0x65, (byte) 0x6e, (byte) 0x74, (byte) 0x00, (byte) 0xf6, |
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63 (byte) 0xcc, (byte) 0x96, (byte) 0xbf, (byte) 0x00, (byte) 0x00, |
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64 (byte) 0x00, (byte) 0x0a, (byte) 0x49, (byte) 0x44, (byte) 0x41, |
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65 (byte) 0x54, (byte) 0x08, (byte) 0xd7, (byte) 0x63, (byte) 0xf8, |
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66 (byte) 0x0f, (byte) 0x00, (byte) 0x01, (byte) 0x01, (byte) 0x01, |
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67 (byte) 0x00, (byte) 0x1b, (byte) 0xb6, (byte) 0xee, (byte) 0x56, |
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68 (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x49, |
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69 (byte) 0x45, (byte) 0x4e, (byte) 0x44, (byte) 0xae, (byte) 0x42, |
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70 (byte) 0x60, (byte) 0x82 }; |
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71 |
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72 private static final Output empty() { |
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73 return new Output(EMPTY, "image/png"); |
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74 } |
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75 |
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76 protected abstract JFreeChart createChart(Document data, |
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77 GlobalContext globalContext, CallMeta callMeta); |
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78 |
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79 protected void init() { |
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80 }; |
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81 |
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82 protected void finish() { |
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83 }; |
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84 |
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85 @Override |
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86 public Service.Output process(Document data, GlobalContext globalContext, |
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87 CallMeta callMeta) { |
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88 log.debug("process"); |
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89 |
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90 init(); |
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91 try { |
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92 JFreeChart chart = createChart(data, globalContext, callMeta); |
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93 |
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94 if (chart == null) { |
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95 return empty(); |
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96 } |
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97 |
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98 Dimension extent = getExtent(data); |
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99 String format = getFormat(data); |
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100 |
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101 return encode(chart, extent, format); |
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102 } |
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103 finally { |
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104 finish(); |
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105 } |
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106 } |
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107 |
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108 protected static Output encode(JFreeChart chart, Dimension extent, |
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109 String format) { |
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110 BufferedImage image = chart.createBufferedImage(extent.width, |
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111 extent.height, Transparency.BITMASK, null); |
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112 |
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113 ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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114 |
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115 try { |
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116 ImageIO.write(image, format, out); |
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117 } |
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118 catch (IOException ioe) { |
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119 log.warn("writing image failed", ioe); |
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120 return empty(); |
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121 } |
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122 |
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123 return new Output(out.toByteArray(), "image/" + format); |
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124 } |
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125 |
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126 protected static Dimension getExtent(Document input) { |
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127 |
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128 int width = DEFAULT_WIDTH; |
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129 int height = DEFAULT_HEIGHT; |
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130 |
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131 NodeList extents = input.getElementsByTagName("extent"); |
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132 |
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133 if (extents.getLength() > 0) { |
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134 Element element = (Element) extents.item(0); |
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135 String w = element.getAttribute("width"); |
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136 String h = element.getAttribute("height"); |
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137 |
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138 try { |
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139 width = Math.max(1, Integer.parseInt(w)); |
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140 } |
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141 catch (NumberFormatException nfe) { |
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142 log.warn("width '" + w + "' is not a valid."); |
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143 } |
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144 |
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145 try { |
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146 height = Math.max(1, Integer.parseInt(h)); |
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147 } |
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148 catch (NumberFormatException nfe) { |
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149 log.warn("height '" + h + "' is not a valid"); |
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150 } |
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151 } |
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152 |
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153 return new Dimension(width, height); |
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154 } |
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155 |
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156 protected static String getFormat(Document input) { |
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157 String format = DEFAULT_FORMAT; |
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158 |
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159 NodeList formats = input.getElementsByTagName("format"); |
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160 |
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161 if (formats.getLength() > 0) { |
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162 String type = ((Element) formats.item(0)).getAttribute("type"); |
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163 if (type.length() > 0) { |
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164 format = type; |
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165 } |
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166 } |
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167 |
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168 return format; |
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169 } |
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170 } |