Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GaugeInfoServiceImpl.java @ 4173:7d4480c0e68e

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Allow users to select the current relevant discharge table in historical discharge table calculattion. In addition to this, the discharge tables in the helper panel displayed in the client is ordered in time.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 18 Oct 2012 12:13:48 +0200
parents 52a98e1653c1
children
rev   line source
2466
52a98e1653c1 Added a new RPC service to fetch gauge information.
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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 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.NodeList;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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15
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16 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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17 import de.intevation.artifacts.common.utils.XMLUtils;
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18
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19 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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20 import de.intevation.artifacts.httpclient.http.HttpClient;
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21 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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22
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23 import de.intevation.flys.client.shared.exceptions.ServerException;
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24 import de.intevation.flys.client.client.services.GaugeInfoService;
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25 import de.intevation.flys.client.shared.model.Gauge;
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26 import de.intevation.flys.client.shared.model.GaugeImpl;
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27
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28
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29 /**
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public class GaugeInfoServiceImpl
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33 extends RemoteServiceServlet
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34 implements GaugeInfoService
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35 {
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36 private static final Logger logger =
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37 Logger.getLogger(GaugeInfoServiceImpl.class);
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38
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39
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40 public static final String ERROR_NO_GAUGES_FOUND =
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41 "error_no_gaugeinfo_found";
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42
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43 public static final String XPATH_GAUGES = "art:service/art:gauge";
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44
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45
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46 public List<Gauge> getGaugeInfo(String rivername, String refnumber)
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47 throws ServerException
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48 {
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49 logger.info("GaugeInfoServiceImpl.getGaugeInfo");
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50
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51 String url = getServletContext().getInitParameter("server-url");
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52
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53 Document doc = XMLUtils.newDocument();
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54
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55 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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56 doc,
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57 ArtifactNamespaceContext.NAMESPACE_URI,
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58 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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59
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60 Element river = ec.create("river");
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61 ec.addAttr(river, "name", rivername);
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62
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63 if (refnumber != null && refnumber.length() > 0) {
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64 Element filter = ec.create("filter");
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65 Element gauge = ec.create("gauge");
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66 gauge.setTextContent(refnumber);
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67
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68 filter.appendChild(gauge);
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69 river.appendChild(filter);
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70 }
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71
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72 doc.appendChild(river);
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73
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74 HttpClient client = new HttpClientImpl(url);
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75
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76 try {
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77 Document result = client.callService(url, "gaugeinfo", doc);
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78
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79 logger.debug("Extract gauge info now.");
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80 List<Gauge> gauges = extractGauges(result);
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81
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82 if (gauges != null && gauges.size() > 0) {
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83 return gauges;
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84 }
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85 }
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86 catch (ConnectionException ce) {
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87 logger.error(ce, ce);
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88 }
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89
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90 throw new ServerException(ERROR_NO_GAUGES_FOUND);
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91 }
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92
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93
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94 /**
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95 * Extracts all wq info objects from <i>result</i> document.
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96 *
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97 * @param result The document retrieved by the server.
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98 *
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99 * @return a list of WQInfoObjects.
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100 */
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101 protected List<Gauge> extractGauges(Document result)
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102 throws ServerException
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103 {
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104 List<Gauge> gauges = new ArrayList<Gauge>();
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105
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106 NodeList list = (NodeList) XMLUtils.xpath(
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107 result,
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108 XPATH_GAUGES,
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109 XPathConstants.NODESET,
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110 ArtifactNamespaceContext.INSTANCE);
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111
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112 if (list == null || list.getLength() == 0) {
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113 logger.warn("No gauges found.");
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114
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115 throw new ServerException(ERROR_NO_GAUGES_FOUND);
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116 }
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117
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118 int num = list.getLength();
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119 logger.debug("Response contains " + num + " objects.");
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120
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121 for (int i = 0; i < num; i++) {
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122 Gauge obj = buildGauge((Element) list.item(i));
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123
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124 if (obj != null) {
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125 gauges.add(obj);
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126 }
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127 }
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128
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129 logger.debug("Retrieved " + gauges.size() + " gauges.");
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130
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131 return gauges;
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132 }
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133
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134
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135 protected Gauge buildGauge(Element ele) {
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136 String name = ele.getAttribute("name");
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137 String lowerStr = ele.getAttribute("lower");
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138 String upperStr = ele.getAttribute("upper");
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139
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140 if (lowerStr != null && upperStr != null) {
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141 try {
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142 return new GaugeImpl(
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143 name,
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144 Double.valueOf(lowerStr),
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145 Double.valueOf(upperStr));
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146 }
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147 catch (NumberFormatException nfe) {
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148 logger.warn("Error while Gauge creation: " + nfe.getMessage());
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149 }
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150 }
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151
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152 return null;
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153 }
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154 }
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155 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org