Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/GaugeInfoServiceImpl.java @ 3992:a9c93b7c9da1

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Simpify the S(Q) fraction sieving stuff.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 30 Sep 2012 21:15:23 +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