Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/server/GaugeInfoServiceImpl.java @ 7136:fd8b27cdf498
issue971: Let ChartOutputServiceImpl interprete an "encoding" parameter.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 25 Sep 2013 11:48:54 +0200 |
parents | ea9eef426962 |
children | 238fc722f87a |
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.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 : |