Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DischargeInfoServiceImpl.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 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 }
67468c90ca68 Added service to request discharge infos at a specific gauge.
Raimund Renkert <raimund.renkert@intevation.de>
parents:
diff changeset
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