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annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 552:6050d49eaba3

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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>
date Tue, 07 Jun 2011 13:26:24 +0000
parents e74bf6bfeeb6
children c5fc3fa02edb
rev   line source
535
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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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
552
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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
552
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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 */
552
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178 protected Transform2D parseTransformationMatrix(Document doc) {
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179 System.out.println("ChartInfoServiceImpl.parseTransformationMatrix");
535
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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 :
http://dive4elements.wald.intevation.org