Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 4700:0ba0f3e4f4c2 2.9.7
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author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Mon, 17 Dec 2012 17:59:03 +0100 |
parents | bc06a671ef60 |
children | e70ff0a600a3 |
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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.Node; |
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11 import org.w3c.dom.NodeList; |
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12 |
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13 import org.apache.log4j.Logger; |
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14 |
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15 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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16 |
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17 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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18 import de.intevation.artifacts.common.utils.XMLUtils; |
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19 |
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20 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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21 import de.intevation.artifacts.httpclient.http.HttpClient; |
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22 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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23 |
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24 import de.intevation.flys.client.shared.exceptions.ServerException; |
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25 import de.intevation.flys.client.client.services.WQInfoService; |
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26 import de.intevation.flys.client.shared.model.WQInfoObject; |
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27 import de.intevation.flys.client.shared.model.WQInfoObjectImpl; |
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28 |
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29 |
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30 /** |
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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32 */ |
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33 public class WQInfoServiceImpl |
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34 extends RemoteServiceServlet |
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35 implements WQInfoService |
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36 { |
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37 private static final Logger logger = |
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38 Logger.getLogger(WQInfoServiceImpl.class); |
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39 |
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41 public static final String ERROR_NO_WQINFO_FOUND = |
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42 "error_no_wqinfo_found"; |
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43 |
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44 public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue"; |
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45 |
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46 |
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47 public WQInfoObject[] getWQInfo( |
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48 String locale, |
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49 String river, |
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50 double from, |
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51 double to) |
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52 throws ServerException |
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53 { |
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54 logger.info("WQInfoServiceImpl.getWQInfo"); |
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55 |
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56 String url = getServletContext().getInitParameter("server-url"); |
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57 |
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58 Document doc = XMLUtils.newDocument(); |
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59 |
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60 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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61 doc, |
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62 ArtifactNamespaceContext.NAMESPACE_URI, |
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63 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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64 |
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65 Element mainvalues = ec.create("mainvalues"); |
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66 Element riverEl = ec.create("river"); |
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67 Element startEl = ec.create("start"); |
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68 Element endEl = ec.create("end"); |
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69 |
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70 riverEl.setTextContent(river); |
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71 startEl.setTextContent(Double.valueOf(from).toString()); |
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72 endEl.setTextContent(Double.valueOf(to).toString()); |
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73 |
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74 mainvalues.appendChild(riverEl); |
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75 mainvalues.appendChild(startEl); |
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76 mainvalues.appendChild(endEl); |
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77 |
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78 doc.appendChild(mainvalues); |
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79 |
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80 HttpClient client = new HttpClientImpl(url, locale); |
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81 |
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82 try { |
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83 Document result = client.callService(url, "mainvalues", doc); |
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84 |
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85 logger.debug("Extract wq info objects now."); |
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86 WQInfoObject[] objects = extractWQInfoObjects(result); |
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87 |
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88 if (objects != null && objects.length > 0) { |
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89 return objects; |
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90 } |
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91 } |
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92 catch (ConnectionException ce) { |
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93 logger.error(ce, ce); |
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94 } |
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95 |
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96 throw new ServerException(ERROR_NO_WQINFO_FOUND); |
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97 } |
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98 |
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99 |
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100 /** |
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101 * Extracts all wq info objects from <i>result</i> document. |
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102 * |
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103 * @param result The document retrieved by the server. |
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104 * |
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105 * @return a list of WQInfoObjects. |
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106 */ |
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107 protected WQInfoObject[] extractWQInfoObjects(Document result) |
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108 throws ServerException |
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109 { |
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110 NodeList list = (NodeList) XMLUtils.xpath( |
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111 result, |
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112 XPATH_WQS, |
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113 XPathConstants.NODESET, |
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114 ArtifactNamespaceContext.INSTANCE); |
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115 |
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116 if (list == null || list.getLength() == 0) { |
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117 logger.warn("No wq info found."); |
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118 |
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119 throw new ServerException(ERROR_NO_WQINFO_FOUND); |
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120 } |
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121 |
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122 int num = list.getLength(); |
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123 logger.debug("Response contains " + num + " objects."); |
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124 |
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125 List<WQInfoObject> objects = |
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126 new ArrayList<WQInfoObject>(num); |
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127 |
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128 for (int i = 0; i < num; i++) { |
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129 WQInfoObject obj = buildWQInfoObject(list.item(i)); |
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130 |
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131 if (obj != null) { |
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132 objects.add(obj); |
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133 } |
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134 } |
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135 |
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136 logger.debug("Retrieved " + objects.size() + " wq values"); |
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137 |
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138 return (WQInfoObject[]) |
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139 objects.toArray(new WQInfoObject[num]); |
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140 } |
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141 |
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142 |
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143 /** |
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144 * Extracts information for a single wq info object and intializes an |
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145 * WQInfoObject with them. |
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146 * |
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147 * @param node The node that contains the information. |
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148 * |
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149 * @return a valid WQInfoObject. |
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150 */ |
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151 protected WQInfoObject buildWQInfoObject(Node node) { |
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152 String name = XMLUtils.xpathString( |
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153 node, "@name", ArtifactNamespaceContext.INSTANCE); |
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154 |
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155 String type = XMLUtils.xpathString( |
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156 node, "@type", ArtifactNamespaceContext.INSTANCE); |
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157 |
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158 String value = XMLUtils.xpathString( |
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159 node, "@value", ArtifactNamespaceContext.INSTANCE); |
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160 |
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161 |
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162 if (name != null && type != null) { |
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163 try { |
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164 return new WQInfoObjectImpl( |
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165 name, |
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166 type, |
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167 new Double(value)); |
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168 } |
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169 catch (NumberFormatException nfe) { |
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170 logger.warn(nfe.getLocalizedMessage()); |
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171 } |
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172 } |
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173 |
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174 logger.warn("Invalid wq info object found."); |
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175 |
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176 return null; |
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177 } |
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178 } |
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179 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |