Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 5818:a4ff4167be1e

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Request feature info on all layers and show it as html if the server does not return valid gml. Non queryable layers produce an error message when the request fails. This is good enough
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 24 Apr 2013 17:33:27 +0200
parents b296d435fc69
children
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.Date;
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7 import java.util.List;
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8 import java.util.Map;
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9
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10 import javax.xml.xpath.XPathConstants;
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11
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12 import org.w3c.dom.Document;
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13 import org.w3c.dom.Element;
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14 import org.w3c.dom.NodeList;
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15
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16 import org.apache.log4j.Logger;
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17
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18 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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19
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20 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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21 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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22 import de.intevation.artifacts.common.utils.XMLUtils;
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23
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24 import de.intevation.artifacts.httpclient.http.HttpClient;
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25 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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26
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27 import de.intevation.flys.client.shared.Transform2D;
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28 import de.intevation.flys.client.shared.exceptions.ServerException;
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29 import de.intevation.flys.client.shared.model.Axis;
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30 import de.intevation.flys.client.shared.model.DateAxis;
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31 import de.intevation.flys.client.shared.model.NumberAxis;
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32 import de.intevation.flys.client.shared.model.ChartInfo;
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33 import de.intevation.flys.client.shared.model.Collection;
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34
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35 import de.intevation.flys.client.client.services.ChartInfoService;
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36
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37
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38 /**
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39 * This service fetches a document that contains meta information for a specific
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40 * chart.
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41 *
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42 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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43 */
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44 public class ChartInfoServiceImpl
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45 extends RemoteServiceServlet
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46 implements ChartInfoService
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47 {
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48 private static final Logger logger =
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49 Logger.getLogger(ChartInfoServiceImpl.class);
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50
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51 public static final String XPATH_TRANSFORM_MATRIX =
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52 "/art:chartinfo/art:transformation-matrix/art:matrix";
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53
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54 public static final String XPATH_X_AXES =
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55 "/art:chartinfo/art:axes/art:domain";
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56
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57 public static final String XPATH_Y_AXES =
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58 "/art:chartinfo/art:axes/art:range";
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59
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60 public static final String EXCEPTION_STRING = "error_chart_info_service";
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61
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62
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63 public ChartInfo getChartInfo(
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64 Collection collection,
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65 String locale,
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66 String type,
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67 Map<String, String> attr)
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68 throws ServerException
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69 {
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70 logger.info("ChartInfoServiceImpl.getChartInfo");
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71
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72 String url = getServletContext().getInitParameter("server-url");
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73
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74 Document request = ClientProtocolUtils.newOutCollectionDocument(
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75 collection.identifier(),
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76 type,
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77 type,
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78 ChartServiceHelper.getChartAttributes(attr));
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79
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80 try {
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81 HttpClient client = new HttpClientImpl(url, locale);
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82 InputStream in = client.collectionOut(
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83 request,
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84 collection.identifier(),
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85 type + "_chartinfo");
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86
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87 Document info = XMLUtils.parseDocument(in);
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88
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89 return parseInfoDocument(info);
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90 }
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91 catch (IOException ioe) {
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92 ioe.printStackTrace();
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93 }
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94 catch (Exception e) {
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95 e.printStackTrace();
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96 }
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97
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98 logger.debug("Error while fetching chart info.");
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99
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100 throw new ServerException(EXCEPTION_STRING);
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101 }
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103
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104 /**
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105 * Parse ChartInfo-Part of document, create Transforms and axes
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106 * from it.
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107 */
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108 protected ChartInfo parseInfoDocument(Document doc) {
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109 Transform2D[] transformer = parseTransformationMatrix(doc);
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110 Axis[] xAxes = parseXAxes(doc);
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111 Axis[] yAxes = parseYAxes(doc);
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112
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113 return new ChartInfo(xAxes, yAxes, transformer);
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114 }
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116
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117 protected Axis[] parseXAxes(Document doc) {
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118 logger.debug("ChartInfoServiceImpl.parseXAxes");
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119
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120 NodeList axes = (NodeList) XMLUtils.xpath(
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121 doc,
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122 XPATH_X_AXES,
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123 XPathConstants.NODESET,
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124 ArtifactNamespaceContext.INSTANCE);
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125
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126 return parseAxes(axes);
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127 }
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128
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129
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130 protected Axis[] parseYAxes(Document doc) {
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131 logger.debug("ChartInfoServiceImpl.parseYAxes");
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132
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133 NodeList axes = (NodeList) XMLUtils.xpath(
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134 doc,
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135 XPATH_Y_AXES,
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136 XPathConstants.NODESET,
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137 ArtifactNamespaceContext.INSTANCE);
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138
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139 return parseAxes(axes);
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140 }
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141
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142
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143 protected Axis[] parseAxes(NodeList axes) {
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144 logger.debug("ChartInfoServiceImpl.parseAxes");
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145
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146 int count = axes != null ? axes.getLength() : 0;
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147
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148 logger.debug("Chart has " + count + " axes.");
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149
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150 if (count == 0) {
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151 return null;
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152 }
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153
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154 Axis[] result = new Axis[count];
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155
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156 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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157
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158 for (int i = 0; i < count; i++) {
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159 Element node = (Element) axes.item(i);
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160
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161 String posStr = node.getAttributeNS(ns, "pos");
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162 String fromStr = node.getAttributeNS(ns, "from");
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163 String toStr = node.getAttributeNS(ns, "to");
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164 String minStr = node.getAttributeNS(ns, "min");
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165 String maxStr = node.getAttributeNS(ns, "max");
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166 String axisType = node.getAttributeNS(ns, "axistype");
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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
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171 if (pos >= result.length) {
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172 // this should never happen
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173 logger.debug("The axis is out of valid range: " + pos);
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174 continue;
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175 }
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176
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177 if (axisType != null && axisType.equals(DateAxis.TYPE)) {
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178 long from = Long.parseLong(fromStr);
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179 long to = Long.parseLong(toStr);
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180 long min = Long.parseLong(minStr);
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181 long max = Long.parseLong(maxStr);
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182
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183 if (logger.isDebugEnabled()) {
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184 logger.debug("date axis from: " + new Date(from));
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185 logger.debug("date axis to : " + new Date(to));
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186 logger.debug("date axis min : " + new Date(min));
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187 logger.debug("date axis max : " + new Date(max));
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188 }
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189
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190 result[pos] = new DateAxis(pos, from, to, min, max);
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191 }
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192 else {
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193 double from = Double.parseDouble(fromStr);
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194 double to = Double.parseDouble(toStr);
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195 double min = Double.parseDouble(minStr);
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196 double max = Double.parseDouble(maxStr);
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197
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198 result[pos] = new NumberAxis(pos, from, to, min, max);
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199 }
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200 }
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201 catch (NumberFormatException nfe) {
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202 nfe.printStackTrace();
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203 }
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204 }
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205
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206 logger.debug("Parsed " + result.length + " axes");
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207
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208 return result;
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209 }
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210
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211
535
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212 /**
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213 * Parses the chart info document and extract the Transform2D values.
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214 *
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215 * @param doc The chart info document.
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216 *
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217 * @return a Transform2D object to transfrom pixel coordinates into chart
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218 * coordinates.
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219 */
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220 protected Transform2D[] parseTransformationMatrix(Document doc) {
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221 logger.debug("ChartInfoServiceImpl.parseTransformationMatrix");
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222
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223 NodeList matrix = (NodeList) XMLUtils.xpath(
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224 doc,
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225 XPATH_TRANSFORM_MATRIX,
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226 XPathConstants.NODESET,
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227 ArtifactNamespaceContext.INSTANCE);
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228
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229 int num = matrix != null ? matrix.getLength() : 0;
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230
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231 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
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232
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233 for (int i = 0; i < num; i++) {
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234 Transform2D t = createTransformer((Element) matrix.item(i));
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235
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236 if (t == null) {
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237 logger.warn("Broken transformation matrix at pos: " + i);
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238 continue;
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239 }
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240
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241 transformer.add(t);
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242 }
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243
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0de61fc9d281 Removed some superfluous casts.
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244 return transformer.toArray(new Transform2D[num]);
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245 }
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246
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247
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248 protected Transform2D createTransformer(Element matrix) {
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249 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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250
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251 String sx = matrix.getAttributeNS(ns, "sx");
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252 String sy = matrix.getAttributeNS(ns, "sy");
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253 String tx = matrix.getAttributeNS(ns, "tx");
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254 String ty = matrix.getAttributeNS(ns, "ty");
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255 String xType = matrix.getAttributeNS(ns, "xtype");
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256 String yType = matrix.getAttributeNS(ns, "ytype");
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257
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258 xType = xType == null || xType.length() == 0 ? "number" : xType;
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259 yType = yType == null || yType.length() == 0 ? "number" : yType;
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260
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261 if (sx != null && sy != null && tx != null && ty != null) {
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262 try {
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263 logger.debug("Create new Transform2D with x format: " + xType);
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264 logger.debug("Create new Transform2D with y format: " + yType);
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265
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266 return new Transform2D(
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267 Double.parseDouble(sx),
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268 Double.parseDouble(sy),
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269 Double.parseDouble(tx),
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270 Double.parseDouble(ty),
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271 xType, yType);
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272 }
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273 catch (NumberFormatException nfe) {
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274 logger.warn("Error while parsing matrix values.");
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275 }
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276 }
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277
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278 logger.warn("No matrix values found.");
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279
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280 return new Transform2D(1d, 1d, 0d, 0d);
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281 }
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282 }
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283 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org