Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 4740:fb135e1dfa35

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Added 'type' attribute to <dc:variable/> element. If an optional 'type' attribute is given the result of the XPATH expression is interpreted as this type. Valid values are 'number', 'bool', 'node' and 'nodeset'. All other defaults to 'string' which also is the default if nor type is given.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 15:31:53 +0100
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
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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38 /**
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39 * This service fetches a document that contains meta information for a specific
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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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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104
4053
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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