Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 1517:a9388fba0b46

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Cosmetics. flys-client/trunk@3670 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 13 Jan 2012 09:47:27 +0000
parents bc06a671ef60
children 8bbaa0d173cf
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.ArrayList;
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6 import java.util.List;
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7 import java.util.Map;
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8
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9 import javax.xml.xpath.XPathConstants;
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10
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11 import org.w3c.dom.Document;
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12 import org.w3c.dom.Node;
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13 import org.w3c.dom.NodeList;
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14
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15 import org.apache.log4j.Logger;
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16
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17 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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21 import de.intevation.artifacts.common.utils.XMLUtils;
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22
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23 import de.intevation.artifacts.httpclient.http.HttpClient;
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24 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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25
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26 import de.intevation.flys.client.shared.Transform2D;
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27 import de.intevation.flys.client.shared.exceptions.ServerException;
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28 import de.intevation.flys.client.shared.model.Axis;
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29 import de.intevation.flys.client.shared.model.ChartInfo;
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30 import de.intevation.flys.client.shared.model.Collection;
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31
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32 import de.intevation.flys.client.client.services.ChartInfoService;
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33
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34
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35 /**
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36 * This service fetches a document that contains meta information for a specific
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37 * chart.
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38 *
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39 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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40 */
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41 public class ChartInfoServiceImpl
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42 extends RemoteServiceServlet
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43 implements ChartInfoService
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44 {
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45 private static final Logger logger =
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46 Logger.getLogger(ChartInfoServiceImpl.class);
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47
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48
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49 public static final String XPATH_TRANSFORM_MATRIX =
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50 "/art:chartinfo/art:transformation-matrix/art:matrix";
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51
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52 public static final String XPATH_X_AXES =
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53 "/art:chartinfo/art:axes/art:domain";
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54
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55 public static final String XPATH_Y_AXES =
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56 "/art:chartinfo/art:axes/art:range";
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57
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58 public static final String EXCEPTION_STRING = "error_chart_info_service";
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59
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60
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61 public ChartInfo getChartInfo(
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62 Collection collection,
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63 String locale,
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64 String type,
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65 Map<String, String> attr)
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66 throws ServerException
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67 {
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68 logger.info("ChartInfoServiceImpl.getChartInfo");
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69
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70 String url = getServletContext().getInitParameter("server-url");
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71
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72 Document request = ClientProtocolUtils.newOutCollectionDocument(
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73 collection.identifier(),
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74 type,
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75 type,
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76 ChartServiceHelper.getChartAttributes(attr));
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77
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78 try {
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79 HttpClient client = new HttpClientImpl(url, locale);
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80 InputStream in = client.collectionOut(
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81 request,
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82 collection.identifier(),
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83 type + "_chartinfo");
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84
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85 Document info = XMLUtils.parseDocument(in);
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86
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87 return parseInfoDocument(info);
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88 }
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89 catch (IOException ioe) {
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90 ioe.printStackTrace();
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91 }
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92 catch (Exception e) {
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93 e.printStackTrace();
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94 }
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95
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96 logger.debug("Error while fetching chart info.");
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97
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98 throw new ServerException(EXCEPTION_STRING);
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99 }
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100
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101
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102 protected ChartInfo parseInfoDocument(Document doc) {
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103 Transform2D[] transformer = parseTransformationMatrix(doc);
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104 Axis[] xAxes = parseXAxes(doc);
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105 Axis[] yAxes = parseYAxes(doc);
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106
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107 return new ChartInfo(xAxes, yAxes, transformer);
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108 }
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109
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110
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111 protected Axis[] parseXAxes(Document doc) {
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112 logger.debug("ChartInfoServiceImpl.parseXAxes");
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113
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114 NodeList axes = (NodeList) XMLUtils.xpath(
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115 doc,
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116 XPATH_X_AXES,
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117 XPathConstants.NODESET,
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118 ArtifactNamespaceContext.INSTANCE);
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119
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120 return parseAxes(axes);
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121 }
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122
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123
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124 protected Axis[] parseYAxes(Document doc) {
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125 logger.debug("ChartInfoServiceImpl.parseYAxes");
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126
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127 NodeList axes = (NodeList) XMLUtils.xpath(
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128 doc,
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129 XPATH_Y_AXES,
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130 XPathConstants.NODESET,
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131 ArtifactNamespaceContext.INSTANCE);
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132
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133 return parseAxes(axes);
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134 }
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135
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136
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137 protected Axis[] parseAxes(NodeList axes) {
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138 logger.debug("ChartInfoServiceImpl.parseAxes");
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139
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140 int count = axes != null ? axes.getLength() : 0;
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141
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142 logger.debug("Chart has " + count + " axes.");
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143
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144 if (count == 0) {
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145 return null;
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146 }
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147
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148 Axis[] result = new Axis[count];
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149
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150 for (int i = 0; i < count; i++) {
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151 Node node = axes.item(i);
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152
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153 String posStr = XMLUtils.xpathString(
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154 node, "@art:pos", ArtifactNamespaceContext.INSTANCE);
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155
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156 String fromStr = XMLUtils.xpathString(
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157 node, "@art:from", ArtifactNamespaceContext.INSTANCE);
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158
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159 String toStr = XMLUtils.xpathString(
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160 node, "@art:to", ArtifactNamespaceContext.INSTANCE);
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161
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162 String minStr = XMLUtils.xpathString(
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163 node, "@art:min", ArtifactNamespaceContext.INSTANCE);
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164
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165 String maxStr = XMLUtils.xpathString(
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166 node, "@art:max", ArtifactNamespaceContext.INSTANCE);
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167
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168 try {
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169 int pos = Integer.parseInt(posStr);
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170 double from = Double.parseDouble(fromStr);
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171 double to = Double.parseDouble(toStr);
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172 double min = Double.parseDouble(minStr);
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173 double max = Double.parseDouble(maxStr);
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174
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175 if (pos >= result.length) {
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176 // this should never happen
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177 logger.debug("The axis is out of valid range: " + pos);
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178 continue;
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179 }
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180
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181 result[pos] = new Axis(pos, from, to, min, max);
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182 }
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183 catch (NumberFormatException nfe) {
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184 nfe.printStackTrace();
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185 }
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186 }
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187
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188 logger.debug("Parsed " + result.length + " axes");
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189
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190 return result;
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191 }
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192
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193
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194 /**
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195 * Parses the chart info document and extract the Transform2D values.
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196 *
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197 * @param doc The chart info document.
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198 *
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199 * @return a Transform2D object to transfrom pixel coordinates into chart
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200 * coordinates.
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201 */
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202 protected Transform2D[] parseTransformationMatrix(Document doc) {
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203 logger.debug("ChartInfoServiceImpl.parseTransformationMatrix");
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204
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205 NodeList matrix = (NodeList) XMLUtils.xpath(
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206 doc,
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207 XPATH_TRANSFORM_MATRIX,
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208 XPathConstants.NODESET,
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209 ArtifactNamespaceContext.INSTANCE);
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210
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211 int num = matrix != null ? matrix.getLength() : 0;
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212
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213 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
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214
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215 for (int i = 0; i < num; i++) {
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216 Transform2D t = createTransformer(matrix.item(i));
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217
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218 if (t == null) {
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219 logger.warn("Broken transformation matrix at pos: " + i);
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220 continue;
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221 }
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222
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223 transformer.add(t);
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224 }
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225
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226 return (Transform2D[]) transformer.toArray(new Transform2D[num]);
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227 }
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228
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229
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230 protected Transform2D createTransformer(Node matrix) {
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231 String sx = XMLUtils.xpathString(
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232 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE);
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233
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234 String sy = XMLUtils.xpathString(
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235 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE);
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236
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237 String tx = XMLUtils.xpathString(
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238 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE);
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239
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240 String ty = XMLUtils.xpathString(
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241 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE);
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242
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243 if (sx != null && sy != null && tx != null && ty != null) {
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244 try {
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245 return new Transform2D(
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246 Double.parseDouble(sx),
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247 Double.parseDouble(sy),
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248 Double.parseDouble(tx),
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249 Double.parseDouble(ty));
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250 }
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251 catch (NumberFormatException nfe) {
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252 logger.warn("Error while parsing matrix values.");
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253 }
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254 }
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255
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256 logger.warn("No matrix values found.");
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257
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258 return new Transform2D(1d, 1d, 0d, 0d);
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259 }
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260 }
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261 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org