Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 552:6050d49eaba3
Adapted the ChartInfoService to return more information about charts than before. In addition, the PanControl is added to the chart toolbar.
flys-client/trunk@2066 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 07 Jun 2011 13:26:24 +0000 |
parents | e74bf6bfeeb6 |
children | c5fc3fa02edb |
rev | line source |
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1 package de.intevation.flys.client.server; |
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2 |
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3 import java.io.InputStream; |
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4 import java.io.IOException; |
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5 import java.util.Map; |
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6 |
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7 import javax.xml.xpath.XPathConstants; |
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8 |
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9 import org.w3c.dom.Document; |
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10 import org.w3c.dom.Node; |
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11 import org.w3c.dom.NodeList; |
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12 |
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13 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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14 |
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15 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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16 import de.intevation.artifacts.common.utils.ClientProtocolUtils; |
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17 import de.intevation.artifacts.common.utils.XMLUtils; |
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18 |
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19 import de.intevation.artifacts.httpclient.http.HttpClient; |
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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21 |
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22 import de.intevation.flys.client.shared.Transform2D; |
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23 import de.intevation.flys.client.shared.exceptions.ServerException; |
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24 import de.intevation.flys.client.shared.model.Axis; |
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25 import de.intevation.flys.client.shared.model.ChartInfo; |
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26 import de.intevation.flys.client.shared.model.Collection; |
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27 |
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28 import de.intevation.flys.client.client.services.ChartInfoService; |
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29 |
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30 |
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31 /** |
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32 * This service fetches a document that contains meta information for a specific |
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33 * chart. |
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34 * |
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35 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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36 */ |
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37 public class ChartInfoServiceImpl |
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38 extends RemoteServiceServlet |
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39 implements ChartInfoService |
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40 { |
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41 public static final String XPATH_TRANSFORM_MATRIX = |
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42 "/art:chartinfo/art:transformation-matrix"; |
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43 |
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44 public static final String XPATH_X_AXES = |
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45 "/art:chartinfo/art:axes/art:domain"; |
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46 |
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47 public static final String XPATH_Y_AXES = |
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48 "/art:chartinfo/art:axes/art:range"; |
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49 |
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50 public static final String EXCEPTION_STRING = "error_chart_info_service"; |
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51 |
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52 |
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53 public ChartInfo getChartInfo( |
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54 Collection collection, |
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55 String url, |
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56 String locale, |
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57 String type, |
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58 Map<String, String> attr) |
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59 throws ServerException |
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60 { |
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61 System.out.println("ChartInfoServiceImpl.getChartInfo"); |
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62 |
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63 Document request = ClientProtocolUtils.newOutCollectionDocument( |
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64 collection.identifier(), |
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65 type, |
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66 type, |
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67 ChartServiceHelper.getChartAttributes(attr)); |
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68 |
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69 try { |
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70 HttpClient client = new HttpClientImpl(url, locale); |
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71 InputStream in = client.collectionOut( |
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72 request, |
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73 collection.identifier(), |
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74 type + "_chartinfo"); |
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75 |
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76 Document info = XMLUtils.parseDocument(in); |
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77 |
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78 return parseInfoDocument(info); |
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79 } |
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80 catch (IOException ioe) { |
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81 // do nothing |
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82 } |
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83 |
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84 System.err.println("Error while fetching chart info."); |
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85 |
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86 throw new ServerException(EXCEPTION_STRING); |
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87 } |
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88 |
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89 |
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90 protected ChartInfo parseInfoDocument(Document doc) { |
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91 Transform2D transformer = parseTransformationMatrix(doc); |
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92 Axis[] xAxes = parseXAxes(doc); |
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93 Axis[] yAxes = parseYAxes(doc); |
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94 |
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95 de.intevation.flys.client.server.XMLDebug.out(doc); |
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96 |
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97 return new ChartInfo(xAxes, yAxes, transformer); |
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98 } |
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99 |
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100 |
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101 protected Axis[] parseXAxes(Document doc) { |
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102 System.out.println("ChartInfoServiceImpl.parseXAxes"); |
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103 |
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104 NodeList axes = (NodeList) XMLUtils.xpath( |
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105 doc, |
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106 XPATH_X_AXES, |
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107 XPathConstants.NODESET, |
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108 ArtifactNamespaceContext.INSTANCE); |
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109 |
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110 return parseAxes(axes); |
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111 } |
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112 |
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113 |
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114 protected Axis[] parseYAxes(Document doc) { |
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115 System.out.println("ChartInfoServiceImpl.parseYAxes"); |
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116 |
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117 NodeList axes = (NodeList) XMLUtils.xpath( |
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118 doc, |
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119 XPATH_Y_AXES, |
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120 XPathConstants.NODESET, |
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121 ArtifactNamespaceContext.INSTANCE); |
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122 |
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123 return parseAxes(axes); |
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124 } |
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125 |
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126 |
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127 protected Axis[] parseAxes(NodeList axes) { |
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128 System.out.println("ChartInfoServiceImpl.parseAxes"); |
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129 |
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130 int count = axes != null ? axes.getLength() : 0; |
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131 |
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132 System.out.println("Chart has " + count + " axes."); |
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133 |
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134 if (count == 0) { |
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135 return null; |
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136 } |
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137 |
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138 Axis[] result = new Axis[count]; |
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139 |
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140 for (int i = 0; i < count; i++) { |
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141 Node node = axes.item(i); |
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142 |
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143 String posStr = XMLUtils.xpathString( |
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144 node, "@art:pos", ArtifactNamespaceContext.INSTANCE); |
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145 |
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146 String fromStr = XMLUtils.xpathString( |
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147 node, "@art:from", ArtifactNamespaceContext.INSTANCE); |
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148 |
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149 String toStr = XMLUtils.xpathString( |
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150 node, "@art:to", ArtifactNamespaceContext.INSTANCE); |
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151 |
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152 try { |
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153 int pos = Integer.parseInt(posStr); |
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154 double from = Double.parseDouble(fromStr); |
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155 double to = Double.parseDouble(toStr); |
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156 |
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157 result[pos] = new Axis(pos, from, to); |
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158 } |
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159 catch (NumberFormatException nfe) { |
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160 nfe.printStackTrace(); |
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161 } |
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162 } |
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163 |
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164 System.out.println("Parsed " + result.length + " axes"); |
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165 |
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166 return result; |
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167 } |
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168 |
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169 |
535
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170 /** |
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171 * Parses the chart info document and extract the Transform2D values. |
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172 * |
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173 * @param doc The chart info document. |
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174 * |
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175 * @return a Transform2D object to transfrom pixel coordinates into chart |
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176 * coordinates. |
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177 */ |
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178 protected Transform2D parseTransformationMatrix(Document doc) { |
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179 System.out.println("ChartInfoServiceImpl.parseTransformationMatrix"); |
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180 |
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181 Node matrix = (Node) XMLUtils.xpath( |
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182 doc, |
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183 XPATH_TRANSFORM_MATRIX, |
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184 XPathConstants.NODE, |
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185 ArtifactNamespaceContext.INSTANCE); |
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186 |
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187 if (matrix == null) { |
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188 return new Transform2D(1d, 1d, 0d, 0d); |
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189 } |
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190 |
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191 String sx = XMLUtils.xpathString( |
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192 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE); |
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193 |
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194 String sy = XMLUtils.xpathString( |
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195 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE); |
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196 |
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197 String tx = XMLUtils.xpathString( |
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198 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE); |
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199 |
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200 String ty = XMLUtils.xpathString( |
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201 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE); |
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202 |
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203 if (sx != null && sy != null && tx != null && ty != null) { |
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204 try { |
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205 return new Transform2D( |
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206 Double.parseDouble(sx), |
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207 Double.parseDouble(sy), |
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208 Double.parseDouble(tx), |
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209 Double.parseDouble(ty)); |
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210 } |
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211 catch (NumberFormatException nfe) { |
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212 System.err.println("Error while parsing matrix values."); |
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213 } |
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214 } |
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215 |
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216 System.err.println("No matrix values found."); |
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217 |
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218 return new Transform2D(1d, 1d, 0d, 0d); |
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219 } |
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220 } |
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221 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |