Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DischargeInfoServiceImpl.java @ 4697:52068f1231da

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Fixed NPE in empty style editor window.
author Raimund Renkert <rrenkert@intevation.de>
date Mon, 17 Dec 2012 17:54:26 +0100
parents 67468c90ca68
children
rev   line source
1600
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.client.server;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import org.w3c.dom.Document;
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7 import org.w3c.dom.Element;
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8 import org.w3c.dom.NodeList;
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9
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10 import org.apache.log4j.Logger;
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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.XMLUtils;
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16
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17 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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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.exceptions.ServerException;
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22 import de.intevation.flys.client.client.services.DischargeInfoService;
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23 import de.intevation.flys.client.shared.model.DischargeInfoObject;
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24 import de.intevation.flys.client.shared.model.DischargeInfoObjectImpl;
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25
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26
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27 /**
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28 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a>
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29 */
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30 public class DischargeInfoServiceImpl
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31 extends RemoteServiceServlet
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32 implements DischargeInfoService
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33 {
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34 private static final Logger logger =
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35 Logger.getLogger(DischargeInfoServiceImpl.class);
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36
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37 public static final String ERROR_NO_DISCHARGEINFO_FOUND =
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38 "error_no_dischargeinfo_found";
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39
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40 public static final String XPATH_DISTANCES = "art:discharges/art:discharge";
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41
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42
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43 public DischargeInfoObject[] getDischargeInfo(
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44 String locale,
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45 long gauge)
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46 throws ServerException
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47 {
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48 logger.info("DichargeInfoServiceImpl.getDischargeInfo");
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49
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50 String url = getServletContext().getInitParameter("server-url");
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51
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52 Document doc = XMLUtils.newDocument();
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53
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54 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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55 doc,
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56 ArtifactNamespaceContext.NAMESPACE_URI,
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57 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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58
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59 Element gaugeEl = ec.create("gauge");
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60 gaugeEl.setTextContent(String.valueOf(gauge));
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61
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62 doc.appendChild(gaugeEl);
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63
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64 HttpClient client = new HttpClientImpl(url, locale);
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65
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66 try {
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67 Document result = client.callService(url, "dischargeinfo", doc);
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68
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69 logger.debug("Extract discharge info objects now.");
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70 DischargeInfoObject[] objects = extractDischargeInfoObjects(result);
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71
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72 if (objects != null && objects.length > 0) {
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73 return objects;
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74 }
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75 }
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76 catch (ConnectionException ce) {
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77 logger.error(ce, ce);
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78 }
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79
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80 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND);
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81 }
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82
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83 protected DischargeInfoObject[] extractDischargeInfoObjects(
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84 Document result
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85 )
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86 throws ServerException {
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87 NodeList list = result.getElementsByTagName("discharge");
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88
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89 if (list == null || list.getLength() == 0) {
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90 logger.warn("No discharge info found.");
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91 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND);
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92 }
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93
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94 int num = list.getLength();
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95 logger.debug("Response contains " + num + " objects.");
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96
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97 List<DischargeInfoObject> objects =
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98 new ArrayList<DischargeInfoObject>(num);
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99
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100 for (int i = 0; i < num; i++) {
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101 DischargeInfoObject obj = buildDischargeInfoObject(
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102 (Element)list.item(i));
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103
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104 if (obj != null) {
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105 objects.add(obj);
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106 }
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107 }
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108
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109 logger.debug("Retrieved " + objects.size() + " discharges.");
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110
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111 return (DischargeInfoObject[])
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112 objects.toArray(new DischargeInfoObject[num]);
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113
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114 }
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115
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116 protected DischargeInfoObject buildDischargeInfoObject(Element node) {
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117
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118 String desc = node.getAttribute("description").trim();
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119 String start = node.getAttribute("start").trim();
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120 String end = node.getAttribute("end").trim();
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121
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122 if (start.length() > 0 && end.length() > 0) {
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123 try {
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124 Integer startYear = new Integer(start);
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125 Integer endYear = new Integer(end);
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126 return new DischargeInfoObjectImpl(desc, startYear, endYear);
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127 }
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128 catch (NumberFormatException nfe) {
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129 logger.warn(nfe.getLocalizedMessage());
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130 }
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131 }
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
132
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
133 logger.warn("Invalid distance info object found.");
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
134
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
135 return null;
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
136 }
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
137 }
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
138 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org