Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/GaugeInfoServiceImpl.java @ 9801:1d7a72a50183 3.2.x tip

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Assume Compose V2, consistently
author Tom Gottfried <tom@intevation.de>
date Thu, 23 Nov 2023 10:14:13 +0100
parents 0a5239a1e46e
children
rev   line source
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.client.server;
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10
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11 import java.util.ArrayList;
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12 import java.util.List;
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13
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14 import javax.xml.xpath.XPathConstants;
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15
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16 import org.w3c.dom.Document;
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17 import org.w3c.dom.Element;
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18 import org.w3c.dom.NodeList;
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19
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20 import org.apache.logging.log4j.Logger;
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21 import org.apache.logging.log4j.LogManager;
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22
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23 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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24
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25 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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26 import org.dive4elements.artifacts.common.utils.XMLUtils;
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27
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28 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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29 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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30 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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31
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32 import org.dive4elements.river.client.shared.exceptions.ServerException;
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33 import org.dive4elements.river.client.client.services.GaugeInfoService;
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34 import org.dive4elements.river.client.shared.model.Gauge;
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35 import org.dive4elements.river.client.shared.model.GaugeImpl;
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36
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37
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38 /**
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39 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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40 */
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41 public class GaugeInfoServiceImpl
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42 extends RemoteServiceServlet
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43 implements GaugeInfoService
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44 {
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45 private static final Logger log =
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46 LogManager.getLogger(GaugeInfoServiceImpl.class);
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47
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48
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49 public static final String ERROR_NO_GAUGES_FOUND =
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50 "error_no_gaugeinfo_found";
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51
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52 public static final String XPATH_GAUGES = "art:service/art:gauge";
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53
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54
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55 public List<Gauge> getGaugeInfo(String rivername, String refnumber)
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56 throws ServerException
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57 {
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58 log.info("GaugeInfoServiceImpl.getGaugeInfo");
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59
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60 String url = getServletContext().getInitParameter("server-url");
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61
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62 Document doc = XMLUtils.newDocument();
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63
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64 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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65 doc,
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66 ArtifactNamespaceContext.NAMESPACE_URI,
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67 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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68
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69 Element river = ec.create("river");
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70 ec.addAttr(river, "name", rivername);
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71
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72 if (refnumber != null && refnumber.length() > 0) {
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73 Element filter = ec.create("filter");
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74 Element gauge = ec.create("gauge");
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75 gauge.setTextContent(refnumber);
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76
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77 filter.appendChild(gauge);
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78 river.appendChild(filter);
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79 }
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80
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81 doc.appendChild(river);
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82
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83 HttpClient client = new HttpClientImpl(url);
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84
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85 try {
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86 Document result = client.callService(url, "gaugeinfo", doc);
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87
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88 log.debug("Extract gauge info now.");
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89 List<Gauge> gauges = extractGauges(result);
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90
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91 if (gauges != null && gauges.size() > 0) {
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92 return gauges;
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93 }
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94 }
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95 catch (ConnectionException ce) {
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96 log.error(ce, ce);
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97 }
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98
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99 throw new ServerException(ERROR_NO_GAUGES_FOUND);
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100 }
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101
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102
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103 /**
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104 * Extracts all wq info objects from <i>result</i> document.
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105 *
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106 * @param result The document retrieved by the server.
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107 *
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108 * @return a list of WQInfoObjects.
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109 */
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110 protected List<Gauge> extractGauges(Document result)
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111 throws ServerException
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112 {
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113 List<Gauge> gauges = new ArrayList<Gauge>();
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114
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115 NodeList list = (NodeList) XMLUtils.xpath(
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116 result,
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117 XPATH_GAUGES,
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118 XPathConstants.NODESET,
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119 ArtifactNamespaceContext.INSTANCE);
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120
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121 if (list == null || list.getLength() == 0) {
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122 log.warn("No gauges found.");
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123
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124 throw new ServerException(ERROR_NO_GAUGES_FOUND);
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125 }
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126
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127 int num = list.getLength();
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128 log.debug("Response contains " + num + " objects.");
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129
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130 for (int i = 0; i < num; i++) {
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131 Gauge obj = buildGauge((Element) list.item(i));
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132
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133 if (obj != null) {
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134 gauges.add(obj);
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135 }
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136 }
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137
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138 log.debug("Retrieved " + gauges.size() + " gauges.");
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139
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140 return gauges;
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141 }
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142
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143
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144 protected Gauge buildGauge(Element ele) {
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145 String name = ele.getAttribute("name");
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146 String lowerStr = ele.getAttribute("lower");
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147 String upperStr = ele.getAttribute("upper");
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148
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149 if (lowerStr != null && upperStr != null) {
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150 try {
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151 return new GaugeImpl(
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152 name,
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153 Double.valueOf(lowerStr),
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154 Double.valueOf(upperStr));
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155 }
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156 catch (NumberFormatException nfe) {
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157 log.warn("Error while Gauge creation: " + nfe.getMessage());
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158 }
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159 }
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160
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161 return null;
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162 }
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163 }
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164 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org