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annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 1338:c730f0438510
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flys-client/trunk@2983 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Raimund Renkert <raimund.renkert@intevation.de> |
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date | Mon, 17 Oct 2011 10:22:19 +0000 |
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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.List; |
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7 import java.util.Map; |
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8 |
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9 import javax.xml.xpath.XPathConstants; |
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10 |
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11 import org.w3c.dom.Document; |
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12 import org.w3c.dom.Node; |
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13 import org.w3c.dom.NodeList; |
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14 |
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15 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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16 |
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17 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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18 import de.intevation.artifacts.common.utils.ClientProtocolUtils; |
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19 import de.intevation.artifacts.common.utils.XMLUtils; |
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20 |
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21 import de.intevation.artifacts.httpclient.http.HttpClient; |
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22 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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23 |
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24 import de.intevation.flys.client.shared.Transform2D; |
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25 import de.intevation.flys.client.shared.exceptions.ServerException; |
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26 import de.intevation.flys.client.shared.model.Axis; |
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27 import de.intevation.flys.client.shared.model.ChartInfo; |
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28 import de.intevation.flys.client.shared.model.Collection; |
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29 |
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30 import de.intevation.flys.client.client.services.ChartInfoService; |
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31 |
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32 |
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33 /** |
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34 * This service fetches a document that contains meta information for a specific |
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35 * chart. |
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36 * |
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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38 */ |
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39 public class ChartInfoServiceImpl |
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40 extends RemoteServiceServlet |
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41 implements ChartInfoService |
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42 { |
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43 public static final String XPATH_TRANSFORM_MATRIX = |
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44 "/art:chartinfo/art:transformation-matrix/art:matrix"; |
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45 |
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46 public static final String XPATH_X_AXES = |
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47 "/art:chartinfo/art:axes/art:domain"; |
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48 |
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49 public static final String XPATH_Y_AXES = |
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50 "/art:chartinfo/art:axes/art:range"; |
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51 |
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52 public static final String EXCEPTION_STRING = "error_chart_info_service"; |
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53 |
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54 |
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55 public ChartInfo getChartInfo( |
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56 Collection collection, |
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57 String url, |
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58 String locale, |
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59 String type, |
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60 Map<String, String> attr) |
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61 throws ServerException |
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62 { |
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63 System.out.println("ChartInfoServiceImpl.getChartInfo"); |
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64 |
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65 Document request = ClientProtocolUtils.newOutCollectionDocument( |
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66 collection.identifier(), |
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67 type, |
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68 type, |
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69 ChartServiceHelper.getChartAttributes(attr)); |
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70 |
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71 try { |
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72 HttpClient client = new HttpClientImpl(url, locale); |
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73 InputStream in = client.collectionOut( |
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74 request, |
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75 collection.identifier(), |
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76 type + "_chartinfo"); |
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77 |
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78 Document info = XMLUtils.parseDocument(in); |
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79 |
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80 return parseInfoDocument(info); |
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81 } |
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82 catch (IOException ioe) { |
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83 ioe.printStackTrace(); |
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84 } |
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85 catch (Exception e) { |
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86 e.printStackTrace(); |
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87 } |
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88 |
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89 System.err.println("Error while fetching chart info."); |
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90 |
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91 throw new ServerException(EXCEPTION_STRING); |
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92 } |
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93 |
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94 |
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95 protected ChartInfo parseInfoDocument(Document doc) { |
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96 Transform2D[] transformer = parseTransformationMatrix(doc); |
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97 Axis[] xAxes = parseXAxes(doc); |
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98 Axis[] yAxes = parseYAxes(doc); |
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99 |
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100 return new ChartInfo(xAxes, yAxes, transformer); |
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101 } |
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102 |
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103 |
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104 protected Axis[] parseXAxes(Document doc) { |
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105 System.out.println("ChartInfoServiceImpl.parseXAxes"); |
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106 |
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107 NodeList axes = (NodeList) XMLUtils.xpath( |
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108 doc, |
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109 XPATH_X_AXES, |
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110 XPathConstants.NODESET, |
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111 ArtifactNamespaceContext.INSTANCE); |
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112 |
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113 return parseAxes(axes); |
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114 } |
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115 |
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116 |
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117 protected Axis[] parseYAxes(Document doc) { |
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118 System.out.println("ChartInfoServiceImpl.parseYAxes"); |
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119 |
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120 NodeList axes = (NodeList) XMLUtils.xpath( |
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121 doc, |
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122 XPATH_Y_AXES, |
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123 XPathConstants.NODESET, |
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124 ArtifactNamespaceContext.INSTANCE); |
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125 |
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126 return parseAxes(axes); |
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127 } |
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128 |
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129 |
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130 protected Axis[] parseAxes(NodeList axes) { |
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131 System.out.println("ChartInfoServiceImpl.parseAxes"); |
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132 |
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133 int count = axes != null ? axes.getLength() : 0; |
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134 |
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135 System.out.println("Chart has " + count + " axes."); |
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136 |
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137 if (count == 0) { |
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138 return null; |
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139 } |
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140 |
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141 Axis[] result = new Axis[count]; |
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142 |
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143 for (int i = 0; i < count; i++) { |
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144 Node node = axes.item(i); |
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145 |
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146 String posStr = XMLUtils.xpathString( |
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147 node, "@art:pos", ArtifactNamespaceContext.INSTANCE); |
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148 |
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149 String fromStr = XMLUtils.xpathString( |
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150 node, "@art:from", ArtifactNamespaceContext.INSTANCE); |
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151 |
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152 String toStr = XMLUtils.xpathString( |
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153 node, "@art:to", ArtifactNamespaceContext.INSTANCE); |
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154 |
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155 String minStr = XMLUtils.xpathString( |
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156 node, "@art:min", ArtifactNamespaceContext.INSTANCE); |
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157 |
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158 String maxStr = XMLUtils.xpathString( |
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159 node, "@art:max", ArtifactNamespaceContext.INSTANCE); |
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160 |
552
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161 try { |
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162 int pos = Integer.parseInt(posStr); |
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163 double from = Double.parseDouble(fromStr); |
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164 double to = Double.parseDouble(toStr); |
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165 double min = Double.parseDouble(minStr); |
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166 double max = Double.parseDouble(maxStr); |
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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 System.err.println("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 result[pos] = new Axis(pos, from, to, min, max); |
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175 } |
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176 catch (NumberFormatException nfe) { |
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177 nfe.printStackTrace(); |
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178 } |
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179 } |
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180 |
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181 System.out.println("Parsed " + result.length + " axes"); |
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182 |
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183 return result; |
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184 } |
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185 |
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186 |
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187 /** |
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188 * Parses the chart info document and extract the Transform2D values. |
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189 * |
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190 * @param doc The chart info document. |
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191 * |
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192 * @return a Transform2D object to transfrom pixel coordinates into chart |
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193 * coordinates. |
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194 */ |
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195 protected Transform2D[] parseTransformationMatrix(Document doc) { |
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196 System.out.println("ChartInfoServiceImpl.parseTransformationMatrix"); |
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197 |
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198 NodeList matrix = (NodeList) XMLUtils.xpath( |
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199 doc, |
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200 XPATH_TRANSFORM_MATRIX, |
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201 XPathConstants.NODESET, |
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202 ArtifactNamespaceContext.INSTANCE); |
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203 |
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204 int num = matrix != null ? matrix.getLength() : 0; |
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205 |
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206 List<Transform2D> transformer = new ArrayList<Transform2D>(num); |
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207 |
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208 for (int i = 0; i < num; i++) { |
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209 Transform2D t = createTransformer(matrix.item(i)); |
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210 |
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211 if (t == null) { |
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212 System.err.println("Broken transformation matrix at pos: " + i); |
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213 continue; |
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214 } |
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215 |
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216 transformer.add(t); |
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217 } |
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218 |
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219 return (Transform2D[]) transformer.toArray(new Transform2D[num]); |
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220 } |
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221 |
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222 |
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223 protected Transform2D createTransformer(Node matrix) { |
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224 String sx = XMLUtils.xpathString( |
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225 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE); |
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226 |
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227 String sy = XMLUtils.xpathString( |
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228 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE); |
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229 |
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230 String tx = XMLUtils.xpathString( |
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231 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE); |
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232 |
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233 String ty = XMLUtils.xpathString( |
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234 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE); |
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235 |
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236 if (sx != null && sy != null && tx != null && ty != null) { |
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237 try { |
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238 return new Transform2D( |
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239 Double.parseDouble(sx), |
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240 Double.parseDouble(sy), |
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241 Double.parseDouble(tx), |
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242 Double.parseDouble(ty)); |
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243 } |
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244 catch (NumberFormatException nfe) { |
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245 System.err.println("Error while parsing matrix values."); |
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246 } |
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247 } |
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248 |
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249 System.err.println("No matrix values found."); |
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250 |
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251 return new Transform2D(1d, 1d, 0d, 0d); |
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252 } |
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253 } |
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254 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |