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annotate flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 549:e74bf6bfeeb6

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Use the same code to create the attribute document for the chart creation in ChartOutputService and ChartInfoService. flys-client/trunk@2060 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 07 Jun 2011 10:03:19 +0000
parents 95a7f9cb3d58
children 6050d49eaba3
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.Map;
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6
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7 import javax.xml.xpath.XPathConstants;
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8
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9 import org.w3c.dom.Document;
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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
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18 import de.intevation.artifacts.httpclient.http.HttpClient;
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19 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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20
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21 import de.intevation.flys.client.shared.Transform2D;
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22 import de.intevation.flys.client.shared.exceptions.ServerException;
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23 import de.intevation.flys.client.shared.model.Collection;
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24
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25 import de.intevation.flys.client.client.services.ChartInfoService;
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26
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27
017371801479 Added a chart info service to fetch the info document for a specific chart from artifact server.
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28 /**
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29 * This service fetches a document that contains meta information for a specific
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30 * chart.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class ChartInfoServiceImpl
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35 extends RemoteServiceServlet
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36 implements ChartInfoService
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37 {
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38 public static final String XPATH_TRANSFORM_MATRIX =
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39 "/art:chartinfo/art:transformation-matrix";
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40
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41 public static final String EXCEPTION_STRING = "error_chart_info_service";
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42
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43
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44 public Transform2D getChartInfo(
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45 Collection collection,
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46 String url,
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47 String locale,
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48 String type,
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49 Map<String, String> attr)
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50 throws ServerException
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51 {
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52 System.out.println("ChartInfoServiceImpl.getChartInfo");
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53
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54 Document request = ClientProtocolUtils.newOutCollectionDocument(
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55 collection.identifier(),
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56 type,
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57 type,
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58 ChartServiceHelper.getChartAttributes(attr));
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59
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60 try {
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61 HttpClient client = new HttpClientImpl(url, locale);
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62 InputStream in = client.collectionOut(
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63 request,
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64 collection.identifier(),
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65 type + "_chartinfo");
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66
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67 Document info = XMLUtils.parseDocument(in);
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68
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69 return parseInfoDocument(info);
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70 }
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71 catch (IOException ioe) {
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72 // do nothing
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73 }
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74
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75 System.err.println("Error while fetching chart info.");
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76
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77 throw new ServerException(EXCEPTION_STRING);
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78 }
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79
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80
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81 /**
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82 * Parses the chart info document and extract the Transform2D values.
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83 *
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84 * @param doc The chart info document.
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85 *
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86 * @return a Transform2D object to transfrom pixel coordinates into chart
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87 * coordinates.
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88 */
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89 protected Transform2D parseInfoDocument(Document doc) {
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90 System.out.println("ChartInfoServiceImpl.parseInfoDocument");
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91
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92 Node matrix = (Node) XMLUtils.xpath(
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93 doc,
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94 XPATH_TRANSFORM_MATRIX,
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95 XPathConstants.NODE,
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96 ArtifactNamespaceContext.INSTANCE);
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97
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98 if (matrix == null) {
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99 return new Transform2D(1d, 1d, 0d, 0d);
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100 }
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101
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102 String sx = XMLUtils.xpathString(
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103 matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE);
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104
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105 String sy = XMLUtils.xpathString(
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106 matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE);
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107
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108 String tx = XMLUtils.xpathString(
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109 matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE);
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110
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111 String ty = XMLUtils.xpathString(
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112 matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE);
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113
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114 if (sx != null && sy != null && tx != null && ty != null) {
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115 try {
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116 return new Transform2D(
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117 Double.parseDouble(sx),
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118 Double.parseDouble(sy),
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119 Double.parseDouble(tx),
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120 Double.parseDouble(ty));
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121 }
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122 catch (NumberFormatException nfe) {
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123 System.err.println("Error while parsing matrix values.");
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124 }
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125 }
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126
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127 System.err.println("No matrix values found.");
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128
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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 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org