Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 4246:cac0878b4a92

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Add a service to return measurement stations of a river The new service returns an xml representation of the measurement stations on a river.
author Björn Ricks <bjoern.ricks@intevation.de>
date Wed, 24 Oct 2012 15:57:48 +0200
parents f85f230c5c6c
children b296d435fc69
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 /**
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106 * Parse ChartInfo-Part of document, create Transforms and axes
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107 * from it.
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108 */
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109 protected ChartInfo parseInfoDocument(Document doc) {
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110 Transform2D[] transformer = parseTransformationMatrix(doc);
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111 Axis[] xAxes = parseXAxes(doc);
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112 Axis[] yAxes = parseYAxes(doc);
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113
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114 return new ChartInfo(xAxes, yAxes, transformer);
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115 }
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116
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117
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118 protected Axis[] parseXAxes(Document doc) {
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119 logger.debug("ChartInfoServiceImpl.parseXAxes");
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120
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121 NodeList axes = (NodeList) XMLUtils.xpath(
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122 doc,
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123 XPATH_X_AXES,
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124 XPathConstants.NODESET,
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125 ArtifactNamespaceContext.INSTANCE);
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126
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127 return parseAxes(axes);
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128 }
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129
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130
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131 protected Axis[] parseYAxes(Document doc) {
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132 logger.debug("ChartInfoServiceImpl.parseYAxes");
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133
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134 NodeList axes = (NodeList) XMLUtils.xpath(
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135 doc,
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136 XPATH_Y_AXES,
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137 XPathConstants.NODESET,
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138 ArtifactNamespaceContext.INSTANCE);
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139
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140 return parseAxes(axes);
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141 }
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142
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143
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144 protected Axis[] parseAxes(NodeList axes) {
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145 logger.debug("ChartInfoServiceImpl.parseAxes");
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146
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147 int count = axes != null ? axes.getLength() : 0;
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148
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149 logger.debug("Chart has " + count + " axes.");
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150
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151 if (count == 0) {
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152 return null;
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153 }
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154
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155 Axis[] result = new Axis[count];
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156
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157 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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158
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159 for (int i = 0; i < count; i++) {
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160 Element node = (Element) axes.item(i);
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161
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162 String posStr = node.getAttributeNS(ns, "pos");
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163 String fromStr = node.getAttributeNS(ns, "from");
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164 String toStr = node.getAttributeNS(ns, "to");
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165 String minStr = node.getAttributeNS(ns, "min");
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166 String maxStr = node.getAttributeNS(ns, "max");
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167 String axisType = node.getAttributeNS(ns, "axistype");
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168
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169 try {
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170 int pos = Integer.parseInt(posStr);
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171
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172 if (pos >= result.length) {
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173 // this should never happen
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174 logger.debug("The axis is out of valid range: " + pos);
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175 continue;
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176 }
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177
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178 if (axisType != null && axisType.equals(DateAxis.TYPE)) {
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179 long from = Long.parseLong(fromStr);
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180 long to = Long.parseLong(toStr);
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181 long min = Long.parseLong(minStr);
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182 long max = Long.parseLong(maxStr);
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183
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184 if (logger.isDebugEnabled()) {
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185 logger.debug("date axis from: " + new Date(from));
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186 logger.debug("date axis to : " + new Date(to));
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187 logger.debug("date axis min : " + new Date(min));
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188 logger.debug("date axis max : " + new Date(max));
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189 }
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190
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191 result[pos] = new DateAxis(pos, from, to, min, max);
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192 }
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193 else {
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194 double from = Double.parseDouble(fromStr);
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195 double to = Double.parseDouble(toStr);
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196 double min = Double.parseDouble(minStr);
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197 double max = Double.parseDouble(maxStr);
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198
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199 result[pos] = new NumberAxis(pos, from, to, min, max);
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200 }
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201 }
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202 catch (NumberFormatException nfe) {
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203 nfe.printStackTrace();
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204 }
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205 }
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206
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207 logger.debug("Parsed " + result.length + " axes");
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208
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209 return result;
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210 }
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211
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212
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213 /**
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214 * Parses the chart info document and extract the Transform2D values.
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215 *
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216 * @param doc The chart info document.
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217 *
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218 * @return a Transform2D object to transfrom pixel coordinates into chart
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219 * coordinates.
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220 */
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221 protected Transform2D[] parseTransformationMatrix(Document doc) {
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222 logger.debug("ChartInfoServiceImpl.parseTransformationMatrix");
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223
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224 NodeList matrix = (NodeList) XMLUtils.xpath(
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225 doc,
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226 XPATH_TRANSFORM_MATRIX,
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227 XPathConstants.NODESET,
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228 ArtifactNamespaceContext.INSTANCE);
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229
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230 int num = matrix != null ? matrix.getLength() : 0;
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231
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232 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
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233
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234 for (int i = 0; i < num; i++) {
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235 Transform2D t = createTransformer((Element) matrix.item(i));
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236
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237 if (t == null) {
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238 logger.warn("Broken transformation matrix at pos: " + i);
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239 continue;
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240 }
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241
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242 transformer.add(t);
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243 }
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244
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245 return transformer.toArray(new Transform2D[num]);
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246 }
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247
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248
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249 protected Transform2D createTransformer(Element matrix) {
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250 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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251
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252 String sx = matrix.getAttributeNS(ns, "sx");
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253 String sy = matrix.getAttributeNS(ns, "sy");
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254 String tx = matrix.getAttributeNS(ns, "tx");
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255 String ty = matrix.getAttributeNS(ns, "ty");
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256 String xType = matrix.getAttributeNS(ns, "xtype");
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257 String yType = matrix.getAttributeNS(ns, "ytype");
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258
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259 xType = xType == null || xType.length() == 0 ? "number" : xType;
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260 yType = yType == null || yType.length() == 0 ? "number" : yType;
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261
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262 if (sx != null && sy != null && tx != null && ty != null) {
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263 try {
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264 logger.debug("Create new Transform2D with x format: " + xType);
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265 logger.debug("Create new Transform2D with y format: " + yType);
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266
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267 return new Transform2D(
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268 Double.parseDouble(sx),
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269 Double.parseDouble(sy),
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270 Double.parseDouble(tx),
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271 Double.parseDouble(ty),
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272 xType, yType);
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273 }
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274 catch (NumberFormatException nfe) {
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275 logger.warn("Error while parsing matrix values.");
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276 }
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277 }
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278
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279 logger.warn("No matrix values found.");
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280
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281 return new Transform2D(1d, 1d, 0d, 0d);
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282 }
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283 }
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284 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org