Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 4740:fb135e1dfa35

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Added 'type' attribute to <dc:variable/> element. If an optional 'type' attribute is given the result of the XPATH expression is interpreted as this type. Valid values are 'number', 'bool', 'node' and 'nodeset'. All other defaults to 'string' which also is the default if nor type is given.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 15:31:53 +0100
parents bc06a671ef60
children e70ff0a600a3
rev   line source
245
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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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40
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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");
245
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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.");
245
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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 :
http://dive4elements.wald.intevation.org