Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 2934:a5ebe2e2c772

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issue457 flys-client/trunk@4860 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 03 Jul 2012 12:13:36 +0000
parents 8c1f90e380a3
children 0de61fc9d281
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
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52 public static final String XPATH_TRANSFORM_MATRIX =
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53 "/art:chartinfo/art:transformation-matrix/art:matrix";
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54
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55 public static final String XPATH_X_AXES =
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56 "/art:chartinfo/art:axes/art:domain";
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57
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58 public static final String XPATH_Y_AXES =
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59 "/art:chartinfo/art:axes/art:range";
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60
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61 public static final String EXCEPTION_STRING = "error_chart_info_service";
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62
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63
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64 public ChartInfo getChartInfo(
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65 Collection collection,
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66 String locale,
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67 String type,
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68 Map<String, String> attr)
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69 throws ServerException
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70 {
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71 logger.info("ChartInfoServiceImpl.getChartInfo");
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72
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73 String url = getServletContext().getInitParameter("server-url");
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74
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75 Document request = ClientProtocolUtils.newOutCollectionDocument(
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76 collection.identifier(),
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77 type,
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78 type,
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79 ChartServiceHelper.getChartAttributes(attr));
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80
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81 try {
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82 HttpClient client = new HttpClientImpl(url, locale);
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83 InputStream in = client.collectionOut(
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84 request,
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85 collection.identifier(),
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86 type + "_chartinfo");
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87
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88 Document info = XMLUtils.parseDocument(in);
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89
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90 return parseInfoDocument(info);
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91 }
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92 catch (IOException ioe) {
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93 ioe.printStackTrace();
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94 }
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95 catch (Exception e) {
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96 e.printStackTrace();
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97 }
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98
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99 logger.debug("Error while fetching chart info.");
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100
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101 throw new ServerException(EXCEPTION_STRING);
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102 }
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103
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104
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105 protected ChartInfo parseInfoDocument(Document doc) {
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106 Transform2D[] transformer = parseTransformationMatrix(doc);
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107 Axis[] xAxes = parseXAxes(doc);
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108 Axis[] yAxes = parseYAxes(doc);
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109
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110 return new ChartInfo(xAxes, yAxes, transformer);
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111 }
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112
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114 protected Axis[] parseXAxes(Document doc) {
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115 logger.debug("ChartInfoServiceImpl.parseXAxes");
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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_X_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[] parseYAxes(Document doc) {
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128 logger.debug("ChartInfoServiceImpl.parseYAxes");
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129
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130 NodeList axes = (NodeList) XMLUtils.xpath(
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131 doc,
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132 XPATH_Y_AXES,
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133 XPathConstants.NODESET,
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134 ArtifactNamespaceContext.INSTANCE);
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135
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136 return parseAxes(axes);
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137 }
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138
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139
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140 protected Axis[] parseAxes(NodeList axes) {
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141 logger.debug("ChartInfoServiceImpl.parseAxes");
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142
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143 int count = axes != null ? axes.getLength() : 0;
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144
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145 logger.debug("Chart has " + count + " axes.");
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146
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147 if (count == 0) {
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148 return null;
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149 }
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150
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151 Axis[] result = new Axis[count];
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152
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153 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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154
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155 for (int i = 0; i < count; i++) {
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156 Element node = (Element) axes.item(i);
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157
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158 String posStr = node.getAttributeNS(ns, "pos");
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159 String fromStr = node.getAttributeNS(ns, "from");
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160 String toStr = node.getAttributeNS(ns, "to");
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161 String minStr = node.getAttributeNS(ns, "min");
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162 String maxStr = node.getAttributeNS(ns, "max");
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163 String axisType = node.getAttributeNS(ns, "axistype");
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164
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165 try {
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166 int pos = Integer.parseInt(posStr);
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167
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168 if (pos >= result.length) {
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169 // this should never happen
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170 logger.debug("The axis is out of valid range: " + pos);
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171 continue;
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172 }
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173
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174 if (axisType != null && axisType.equals(DateAxis.TYPE)) {
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175 long from = Long.parseLong(fromStr);
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176 long to = Long.parseLong(toStr);
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177 long min = Long.parseLong(minStr);
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178 long max = Long.parseLong(maxStr);
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179
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180 if (logger.isDebugEnabled()) {
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181 logger.debug("date axis from: " + new Date(from));
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182 logger.debug("date axis to : " + new Date(to));
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183 logger.debug("date axis min : " + new Date(min));
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184 logger.debug("date axis max : " + new Date(max));
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185 }
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186
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187 result[pos] = new DateAxis(pos, from, to, min, max);
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188 }
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189 else {
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190 double from = Double.parseDouble(fromStr);
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191 double to = Double.parseDouble(toStr);
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192 double min = Double.parseDouble(minStr);
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193 double max = Double.parseDouble(maxStr);
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194
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195 result[pos] = new NumberAxis(pos, from, to, min, max);
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196 }
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197 }
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198 catch (NumberFormatException nfe) {
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199 nfe.printStackTrace();
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200 }
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201 }
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202
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203 logger.debug("Parsed " + result.length + " axes");
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204
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205 return result;
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206 }
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207
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208
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209 /**
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210 * Parses the chart info document and extract the Transform2D values.
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211 *
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212 * @param doc The chart info document.
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213 *
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214 * @return a Transform2D object to transfrom pixel coordinates into chart
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215 * coordinates.
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216 */
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217 protected Transform2D[] parseTransformationMatrix(Document doc) {
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218 logger.debug("ChartInfoServiceImpl.parseTransformationMatrix");
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219
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220 NodeList matrix = (NodeList) XMLUtils.xpath(
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221 doc,
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222 XPATH_TRANSFORM_MATRIX,
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223 XPathConstants.NODESET,
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224 ArtifactNamespaceContext.INSTANCE);
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225
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226 int num = matrix != null ? matrix.getLength() : 0;
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227
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228 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
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229
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230 for (int i = 0; i < num; i++) {
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231 Transform2D t = createTransformer((Element) matrix.item(i));
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232
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233 if (t == null) {
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234 logger.warn("Broken transformation matrix at pos: " + i);
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235 continue;
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236 }
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237
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238 transformer.add(t);
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239 }
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240
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241 return (Transform2D[]) transformer.toArray(new Transform2D[num]);
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242 }
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243
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244
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245 protected Transform2D createTransformer(Element matrix) {
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246 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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247
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248 String sx = matrix.getAttributeNS(ns, "sx");
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249 String sy = matrix.getAttributeNS(ns, "sy");
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250 String tx = matrix.getAttributeNS(ns, "tx");
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251 String ty = matrix.getAttributeNS(ns, "ty");
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252 String xType = matrix.getAttributeNS(ns, "xtype");
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253 String yType = matrix.getAttributeNS(ns, "ytype");
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254
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255 xType = xType == null || xType.length() == 0 ? "number" : xType;
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256 yType = yType == null || yType.length() == 0 ? "number" : yType;
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257
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258 if (sx != null && sy != null && tx != null && ty != null) {
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259 try {
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260 logger.debug("Create new Transform2D with x format: " + xType);
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261 logger.debug("Create new Transform2D with y format: " + yType);
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262
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263 return new Transform2D(
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264 Double.parseDouble(sx),
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265 Double.parseDouble(sy),
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266 Double.parseDouble(tx),
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267 Double.parseDouble(ty),
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268 xType, yType);
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269 }
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270 catch (NumberFormatException nfe) {
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271 logger.warn("Error while parsing matrix values.");
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272 }
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273 }
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274
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275 logger.warn("No matrix values found.");
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276
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277 return new Transform2D(1d, 1d, 0d, 0d);
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278 }
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279 }
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280 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org