Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/ChartInfoServiceImpl.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
rev   line source
5861
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.client.server;
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10
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11 import java.io.InputStream;
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12 import java.io.IOException;
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13 import java.util.ArrayList;
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14 import java.util.Date;
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15 import java.util.List;
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16 import java.util.Map;
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17
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18 import javax.xml.xpath.XPathConstants;
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19
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20 import org.w3c.dom.Document;
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21 import org.w3c.dom.Element;
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22 import org.w3c.dom.NodeList;
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23
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24 import org.apache.log4j.Logger;
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25
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26 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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27
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28 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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29 import org.dive4elements.artifacts.common.utils.ClientProtocolUtils;
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30 import org.dive4elements.artifacts.common.utils.XMLUtils;
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31
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32 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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33 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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34
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35 import org.dive4elements.river.client.shared.Transform2D;
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36 import org.dive4elements.river.client.shared.exceptions.ServerException;
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37 import org.dive4elements.river.client.shared.model.Axis;
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38 import org.dive4elements.river.client.shared.model.DateAxis;
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39 import org.dive4elements.river.client.shared.model.NumberAxis;
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40 import org.dive4elements.river.client.shared.model.ChartInfo;
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41 import org.dive4elements.river.client.shared.model.Collection;
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42
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43 import org.dive4elements.river.client.client.services.ChartInfoService;
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44
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45
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46 /**
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47 * This service fetches a document that contains meta information for a specific
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48 * chart.
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49 *
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50 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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51 */
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52 public class ChartInfoServiceImpl
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53 extends RemoteServiceServlet
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54 implements ChartInfoService
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55 {
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56 private static final Logger logger =
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57 Logger.getLogger(ChartInfoServiceImpl.class);
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58
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59 public static final String XPATH_TRANSFORM_MATRIX =
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60 "/art:chartinfo/art:transformation-matrix/art:matrix";
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61
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62 public static final String XPATH_X_AXES =
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63 "/art:chartinfo/art:axes/art:domain";
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64
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65 public static final String XPATH_Y_AXES =
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66 "/art:chartinfo/art:axes/art:range";
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67
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68 public static final String EXCEPTION_STRING = "error_chart_info_service";
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69
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70
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71 public ChartInfo getChartInfo(
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72 Collection collection,
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73 String locale,
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74 String type,
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75 Map<String, String> attr)
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76 throws ServerException
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77 {
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78 logger.info("ChartInfoServiceImpl.getChartInfo");
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79
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80 String url = getServletContext().getInitParameter("server-url");
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81
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82 Document request = ClientProtocolUtils.newOutCollectionDocument(
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83 collection.identifier(),
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84 type,
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85 type,
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86 ChartServiceHelper.getChartAttributes(attr));
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87
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88 try {
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89 HttpClient client = new HttpClientImpl(url, locale);
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90 InputStream in = client.collectionOut(
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91 request,
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92 collection.identifier(),
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93 type + "_chartinfo");
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94
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95 Document info = XMLUtils.parseDocument(in);
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96
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97 return parseInfoDocument(info);
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98 }
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99 catch (IOException ioe) {
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100 ioe.printStackTrace();
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101 }
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102 catch (Exception e) {
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103 e.printStackTrace();
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104 }
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105
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106 logger.debug("Error while fetching chart info.");
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107
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108 throw new ServerException(EXCEPTION_STRING);
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109 }
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111
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112 /**
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113 * Parse ChartInfo-Part of document, create Transforms and axes
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114 * from it.
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115 */
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116 protected ChartInfo parseInfoDocument(Document doc) {
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117 Transform2D[] transformer = parseTransformationMatrix(doc);
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118 Axis[] xAxes = parseXAxes(doc);
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119 Axis[] yAxes = parseYAxes(doc);
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120
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121 return new ChartInfo(xAxes, yAxes, transformer);
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122 }
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123
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124
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125 protected Axis[] parseXAxes(Document doc) {
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126 logger.debug("ChartInfoServiceImpl.parseXAxes");
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127
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128 NodeList axes = (NodeList) XMLUtils.xpath(
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129 doc,
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130 XPATH_X_AXES,
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131 XPathConstants.NODESET,
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132 ArtifactNamespaceContext.INSTANCE);
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133
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134 return parseAxes(axes);
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135 }
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136
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137
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138 protected Axis[] parseYAxes(Document doc) {
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139 logger.debug("ChartInfoServiceImpl.parseYAxes");
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140
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141 NodeList axes = (NodeList) XMLUtils.xpath(
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142 doc,
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143 XPATH_Y_AXES,
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144 XPathConstants.NODESET,
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145 ArtifactNamespaceContext.INSTANCE);
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146
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147 return parseAxes(axes);
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148 }
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149
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150
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151 protected Axis[] parseAxes(NodeList axes) {
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152 logger.debug("ChartInfoServiceImpl.parseAxes");
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153
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154 int count = axes != null ? axes.getLength() : 0;
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155
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156 logger.debug("Chart has " + count + " axes.");
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157
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158 if (count == 0) {
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159 return null;
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160 }
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161
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162 Axis[] result = new Axis[count];
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163
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164 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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165
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166 for (int i = 0; i < count; i++) {
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167 Element node = (Element) axes.item(i);
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168
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169 String posStr = node.getAttributeNS(ns, "pos");
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170 String fromStr = node.getAttributeNS(ns, "from");
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171 String toStr = node.getAttributeNS(ns, "to");
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172 String minStr = node.getAttributeNS(ns, "min");
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173 String maxStr = node.getAttributeNS(ns, "max");
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174 String axisType = node.getAttributeNS(ns, "axistype");
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175
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176 try {
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177 int pos = Integer.parseInt(posStr);
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178
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179 if (pos >= result.length) {
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180 // this should never happen
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181 logger.debug("The axis is out of valid range: " + pos);
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182 continue;
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183 }
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184
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185 if (axisType != null && axisType.equals(DateAxis.TYPE)) {
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186 long from = Long.parseLong(fromStr);
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187 long to = Long.parseLong(toStr);
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188 long min = Long.parseLong(minStr);
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189 long max = Long.parseLong(maxStr);
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190
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191 if (logger.isDebugEnabled()) {
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192 logger.debug("date axis from: " + new Date(from));
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193 logger.debug("date axis to : " + new Date(to));
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194 logger.debug("date axis min : " + new Date(min));
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195 logger.debug("date axis max : " + new Date(max));
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196 }
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197
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198 result[pos] = new DateAxis(pos, from, to, min, max);
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199 }
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200 else {
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201 double from = Double.parseDouble(fromStr);
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202 double to = Double.parseDouble(toStr);
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203 double min = Double.parseDouble(minStr);
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204 double max = Double.parseDouble(maxStr);
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205
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206 result[pos] = new NumberAxis(pos, from, to, min, max);
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207 }
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208 }
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209 catch (NumberFormatException nfe) {
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210 nfe.printStackTrace();
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211 }
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212 }
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213
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214 logger.debug("Parsed " + result.length + " axes");
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215
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216 return result;
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217 }
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218
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219
535
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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220 /**
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221 * Parses the chart info document and extract the Transform2D values.
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222 *
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223 * @param doc The chart info document.
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224 *
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225 * @return a Transform2D object to transfrom pixel coordinates into chart
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226 * coordinates.
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227 */
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228 protected Transform2D[] parseTransformationMatrix(Document doc) {
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229 logger.debug("ChartInfoServiceImpl.parseTransformationMatrix");
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230
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231 NodeList matrix = (NodeList) XMLUtils.xpath(
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232 doc,
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233 XPATH_TRANSFORM_MATRIX,
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234 XPathConstants.NODESET,
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235 ArtifactNamespaceContext.INSTANCE);
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236
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237 int num = matrix != null ? matrix.getLength() : 0;
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238
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239 List<Transform2D> transformer = new ArrayList<Transform2D>(num);
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240
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241 for (int i = 0; i < num; i++) {
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242 Transform2D t = createTransformer((Element) matrix.item(i));
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243
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244 if (t == null) {
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245 logger.warn("Broken transformation matrix at pos: " + i);
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246 continue;
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247 }
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248
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249 transformer.add(t);
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250 }
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251
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252 return transformer.toArray(new Transform2D[num]);
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253 }
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254
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255
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256 protected Transform2D createTransformer(Element matrix) {
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257 String ns = ArtifactNamespaceContext.NAMESPACE_URI;
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258
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259 String sx = matrix.getAttributeNS(ns, "sx");
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260 String sy = matrix.getAttributeNS(ns, "sy");
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261 String tx = matrix.getAttributeNS(ns, "tx");
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262 String ty = matrix.getAttributeNS(ns, "ty");
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263 String xType = matrix.getAttributeNS(ns, "xtype");
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264 String yType = matrix.getAttributeNS(ns, "ytype");
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265
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266 xType = xType == null || xType.length() == 0 ? "number" : xType;
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267 yType = yType == null || yType.length() == 0 ? "number" : yType;
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268
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269 if (sx != null && sy != null && tx != null && ty != null) {
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270 try {
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271 logger.debug("Create new Transform2D with x format: " + xType);
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272 logger.debug("Create new Transform2D with y format: " + yType);
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273
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274 return new Transform2D(
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275 Double.parseDouble(sx),
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276 Double.parseDouble(sy),
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277 Double.parseDouble(tx),
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278 Double.parseDouble(ty),
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279 xType, yType);
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280 }
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281 catch (NumberFormatException nfe) {
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282 logger.warn("Error while parsing matrix values.");
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283 }
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284 }
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285
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286 logger.warn("No matrix values found.");
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287
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288 return new Transform2D(1d, 1d, 0d, 0d);
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289 }
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290 }
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291 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org