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annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 556:046f43e1d305

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Avoid NPE while parsing axes in ChartInfoService. flys-client/trunk@2080 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 08 Jun 2011 12:43:38 +0000
parents c5fc3fa02edb
children 460b8e0f0563
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
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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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 ioe.printStackTrace();
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82 }
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83 catch (Exception e) {
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84 e.printStackTrace();
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85 }
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86
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87 System.err.println("Error while fetching chart info.");
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88
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89 throw new ServerException(EXCEPTION_STRING);
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90 }
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91
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92
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93 protected ChartInfo parseInfoDocument(Document doc) {
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94 Transform2D transformer = parseTransformationMatrix(doc);
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95 Axis[] xAxes = parseXAxes(doc);
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96 Axis[] yAxes = parseYAxes(doc);
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97
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98 return new ChartInfo(xAxes, yAxes, transformer);
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99 }
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100
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101
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102 protected Axis[] parseXAxes(Document doc) {
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103 System.out.println("ChartInfoServiceImpl.parseXAxes");
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104
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105 NodeList axes = (NodeList) XMLUtils.xpath(
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106 doc,
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107 XPATH_X_AXES,
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108 XPathConstants.NODESET,
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109 ArtifactNamespaceContext.INSTANCE);
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110
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111 return parseAxes(axes);
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112 }
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113
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114
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115 protected Axis[] parseYAxes(Document doc) {
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116 System.out.println("ChartInfoServiceImpl.parseYAxes");
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117
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118 NodeList axes = (NodeList) XMLUtils.xpath(
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119 doc,
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120 XPATH_Y_AXES,
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121 XPathConstants.NODESET,
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122 ArtifactNamespaceContext.INSTANCE);
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123
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124 return parseAxes(axes);
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125 }
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126
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127
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128 protected Axis[] parseAxes(NodeList axes) {
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129 System.out.println("ChartInfoServiceImpl.parseAxes");
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130
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131 int count = axes != null ? axes.getLength() : 0;
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132
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133 System.out.println("Chart has " + count + " axes.");
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134
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135 if (count == 0) {
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136 return null;
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137 }
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138
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139 Axis[] result = new Axis[count];
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140
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141 for (int i = 0; i < count; i++) {
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142 Node node = axes.item(i);
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143
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144 String posStr = XMLUtils.xpathString(
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145 node, "@art:pos", ArtifactNamespaceContext.INSTANCE);
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146
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147 String fromStr = XMLUtils.xpathString(
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148 node, "@art:from", ArtifactNamespaceContext.INSTANCE);
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149
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150 String toStr = XMLUtils.xpathString(
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151 node, "@art:to", ArtifactNamespaceContext.INSTANCE);
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152
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153 try {
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154 int pos = Integer.parseInt(posStr);
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155 double from = Double.parseDouble(fromStr);
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156 double to = Double.parseDouble(toStr);
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157
556
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158 if (pos >= result.length) {
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159 // this should never happen
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160 System.err.println("The axis is out of valid range: " + pos);
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161 continue;
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162 }
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163
552
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164 result[pos] = new Axis(pos, from, to);
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165 }
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166 catch (NumberFormatException nfe) {
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167 nfe.printStackTrace();
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168 }
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169 }
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170
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171 System.out.println("Parsed " + result.length + " axes");
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172
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173 return result;
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174 }
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175
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176
535
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177 /**
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178 * Parses the chart info document and extract the Transform2D values.
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179 *
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180 * @param doc The chart info document.
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181 *
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182 * @return a Transform2D object to transfrom pixel coordinates into chart
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183 * coordinates.
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184 */
552
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185 protected Transform2D parseTransformationMatrix(Document doc) {
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186 System.out.println("ChartInfoServiceImpl.parseTransformationMatrix");
535
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187
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188 Node matrix = (Node) XMLUtils.xpath(
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189 doc,
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190 XPATH_TRANSFORM_MATRIX,
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191 XPathConstants.NODE,
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192 ArtifactNamespaceContext.INSTANCE);
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193
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194 if (matrix == null) {
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195 return new Transform2D(1d, 1d, 0d, 0d);
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196 }
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197
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198 String sx = XMLUtils.xpathString(
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199 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE);
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200
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201 String sy = XMLUtils.xpathString(
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202 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE);
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203
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204 String tx = XMLUtils.xpathString(
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205 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE);
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206
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207 String ty = XMLUtils.xpathString(
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208 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE);
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209
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210 if (sx != null && sy != null && tx != null && ty != null) {
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211 try {
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212 return new Transform2D(
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213 Double.parseDouble(sx),
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214 Double.parseDouble(sy),
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215 Double.parseDouble(tx),
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216 Double.parseDouble(ty));
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217 }
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218 catch (NumberFormatException nfe) {
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219 System.err.println("Error while parsing matrix values.");
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220 }
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221 }
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222
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223 System.err.println("No matrix values found.");
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224
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225 return new Transform2D(1d, 1d, 0d, 0d);
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226 }
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227 }
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228 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org