Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 539:fea93eebd2fa

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Improved the layout of the mouse position panel. flys-client/trunk@2039 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 01 Jun 2011 11:59:59 +0000
parents fe2860653f8d
children 95a7f9cb3d58
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
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6 import javax.xml.xpath.XPathConstants;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10 import org.w3c.dom.Node;
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11
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12 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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16 import de.intevation.artifacts.common.utils.XMLUtils;
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17 import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
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18
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19 import de.intevation.artifacts.httpclient.http.HttpClient;
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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21
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22 import de.intevation.flys.client.shared.Transform2D;
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23 import de.intevation.flys.client.shared.exceptions.ServerException;
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24 import de.intevation.flys.client.shared.model.Collection;
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25
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26 import de.intevation.flys.client.client.services.ChartInfoService;
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27
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28
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29 /**
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30 * This service fetches a document that contains meta information for a specific
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31 * chart.
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32 *
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33 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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34 */
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35 public class ChartInfoServiceImpl
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36 extends RemoteServiceServlet
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37 implements ChartInfoService
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38 {
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39 public static final String XPATH_TRANSFORM_MATRIX =
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40 "/art:chartinfo/art:transformation-matrix";
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41
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42 public static final String EXCEPTION_STRING = "error_chart_info_service";
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43
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44
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45 public Transform2D getChartInfo(
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46 Collection collection,
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47 String url,
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48 String locale,
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49 String type,
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50 int width,
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51 int height)
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52 throws ServerException
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53 {
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54 System.out.println("ChartInfoServiceImpl.getChartInfo");
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55
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56 Document request = ClientProtocolUtils.newOutCollectionDocument(
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57 collection.identifier(),
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58 type,
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59 type,
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60 getChartAttributes(width, height));
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61
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62 try {
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63 HttpClient client = new HttpClientImpl(url, locale);
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64 InputStream in = client.collectionOut(
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65 request,
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66 collection.identifier(),
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67 type + "_chartinfo");
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68
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69 Document info = XMLUtils.parseDocument(in);
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70
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71 return parseInfoDocument(info);
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72 }
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73 catch (IOException ioe) {
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74 // do nothing
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75 }
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76
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77 System.err.println("Error while fetching chart info.");
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78
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79 throw new ServerException(EXCEPTION_STRING);
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80 }
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81
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82
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83 /**
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84 * This method returns a document which might contain parameters to adjust
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85 * chart settings. The document is created using the information that are
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86 * contained in the request object.
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87 *
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88 * @param req The request document.
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89 *
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90 * @return a document to adjust chart settings.
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91 */
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92 protected Document getChartAttributes(int width, int height) {
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93 Document doc = XMLUtils.newDocument();
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94
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95 ElementCreator ec = new ElementCreator(
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96 doc,
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97 ArtifactNamespaceContext.NAMESPACE_URI,
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98 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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99
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100 Element size = ec.create("size");
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101
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102 ec.addAttr(size, "width", String.valueOf(width), true);
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103 ec.addAttr(size, "height", String.valueOf(height), true);
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104
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105 doc.appendChild(size);
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106
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107 return doc;
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108 }
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109
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110
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111 /**
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112 * Parses the chart info document and extract the Transform2D values.
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113 *
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114 * @param doc The chart info document.
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115 *
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116 * @return a Transform2D object to transfrom pixel coordinates into chart
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117 * coordinates.
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118 */
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119 protected Transform2D parseInfoDocument(Document doc) {
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120 System.out.println("ChartInfoServiceImpl.parseInfoDocument");
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121
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122 Node matrix = (Node) XMLUtils.xpath(
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123 doc,
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124 XPATH_TRANSFORM_MATRIX,
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125 XPathConstants.NODE,
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126 ArtifactNamespaceContext.INSTANCE);
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127
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128 if (matrix == null) {
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129 return new Transform2D(1d, 1d, 0d, 0d);
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130 }
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131
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132 String sx = XMLUtils.xpathString(
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133 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE);
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134
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135 String sy = XMLUtils.xpathString(
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136 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE);
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137
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138 String tx = XMLUtils.xpathString(
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139 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE);
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140
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141 String ty = XMLUtils.xpathString(
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142 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE);
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143
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144 if (sx != null && sy != null && tx != null && ty != null) {
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145 try {
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146 return new Transform2D(
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147 Double.parseDouble(sx),
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148 Double.parseDouble(sy),
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149 Double.parseDouble(tx),
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150 Double.parseDouble(ty));
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151 }
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152 catch (NumberFormatException nfe) {
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153 System.err.println("Error while parsing matrix values.");
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154 }
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155 }
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156
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157 System.err.println("No matrix values found.");
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158
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159 return new Transform2D(1d, 1d, 0d, 0d);
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160 }
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161 }
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162 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org