Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/GaugeInfoServiceImpl.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
rev   line source
5861
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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.log4j.Logger;
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21
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22 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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23
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24 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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25 import org.dive4elements.artifacts.common.utils.XMLUtils;
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26
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27 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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28 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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29 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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30
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31 import org.dive4elements.river.client.shared.exceptions.ServerException;
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32 import org.dive4elements.river.client.client.services.GaugeInfoService;
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33 import org.dive4elements.river.client.shared.model.Gauge;
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34 import org.dive4elements.river.client.shared.model.GaugeImpl;
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35
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36
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37 /**
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38 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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39 */
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40 public class GaugeInfoServiceImpl
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41 extends RemoteServiceServlet
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42 implements GaugeInfoService
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43 {
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44 private static final Logger logger =
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45 Logger.getLogger(GaugeInfoServiceImpl.class);
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46
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47
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48 public static final String ERROR_NO_GAUGES_FOUND =
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49 "error_no_gaugeinfo_found";
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50
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51 public static final String XPATH_GAUGES = "art:service/art:gauge";
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52
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53
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54 public List<Gauge> getGaugeInfo(String rivername, String refnumber)
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55 throws ServerException
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56 {
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57 logger.info("GaugeInfoServiceImpl.getGaugeInfo");
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58
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59 String url = getServletContext().getInitParameter("server-url");
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60
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61 Document doc = XMLUtils.newDocument();
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62
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63 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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64 doc,
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65 ArtifactNamespaceContext.NAMESPACE_URI,
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66 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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67
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68 Element river = ec.create("river");
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69 ec.addAttr(river, "name", rivername);
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70
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71 if (refnumber != null && refnumber.length() > 0) {
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72 Element filter = ec.create("filter");
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73 Element gauge = ec.create("gauge");
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74 gauge.setTextContent(refnumber);
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75
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76 filter.appendChild(gauge);
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77 river.appendChild(filter);
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78 }
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79
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80 doc.appendChild(river);
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81
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82 HttpClient client = new HttpClientImpl(url);
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83
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84 try {
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85 Document result = client.callService(url, "gaugeinfo", doc);
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86
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87 logger.debug("Extract gauge info now.");
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88 List<Gauge> gauges = extractGauges(result);
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89
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90 if (gauges != null && gauges.size() > 0) {
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91 return gauges;
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92 }
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93 }
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94 catch (ConnectionException ce) {
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95 logger.error(ce, ce);
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96 }
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97
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98 throw new ServerException(ERROR_NO_GAUGES_FOUND);
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99 }
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100
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101
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102 /**
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103 * Extracts all wq info objects from <i>result</i> document.
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104 *
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105 * @param result The document retrieved by the server.
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106 *
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107 * @return a list of WQInfoObjects.
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108 */
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109 protected List<Gauge> extractGauges(Document result)
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110 throws ServerException
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111 {
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112 List<Gauge> gauges = new ArrayList<Gauge>();
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113
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114 NodeList list = (NodeList) XMLUtils.xpath(
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115 result,
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116 XPATH_GAUGES,
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117 XPathConstants.NODESET,
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118 ArtifactNamespaceContext.INSTANCE);
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119
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120 if (list == null || list.getLength() == 0) {
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121 logger.warn("No gauges found.");
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122
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123 throw new ServerException(ERROR_NO_GAUGES_FOUND);
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124 }
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125
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126 int num = list.getLength();
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127 logger.debug("Response contains " + num + " objects.");
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128
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129 for (int i = 0; i < num; i++) {
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130 Gauge obj = buildGauge((Element) list.item(i));
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131
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132 if (obj != null) {
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133 gauges.add(obj);
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134 }
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135 }
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136
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137 logger.debug("Retrieved " + gauges.size() + " gauges.");
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138
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139 return gauges;
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140 }
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141
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142
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143 protected Gauge buildGauge(Element ele) {
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144 String name = ele.getAttribute("name");
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145 String lowerStr = ele.getAttribute("lower");
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146 String upperStr = ele.getAttribute("upper");
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147
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148 if (lowerStr != null && upperStr != null) {
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149 try {
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150 return new GaugeImpl(
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151 name,
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152 Double.valueOf(lowerStr),
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153 Double.valueOf(upperStr));
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154 }
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155 catch (NumberFormatException nfe) {
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156 logger.warn("Error while Gauge creation: " + nfe.getMessage());
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157 }
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158 }
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159
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160 return null;
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161 }
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162 }
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163 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org