Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 3807:d73c43798a99 pre2.6-2011-11-04

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merged flys-backend/pre2.6-2011-11-04
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:51 +0200
parents ab8eb2f544f2
children bc06a671ef60
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
245
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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 url,
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49 String locale,
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50 String river,
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51 double from,
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52 double to)
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53 throws ServerException
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54 {
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55 logger.info("WQInfoServiceImpl.getWQInfo");
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56
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57 Document doc = XMLUtils.newDocument();
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58
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59 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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60 doc,
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61 ArtifactNamespaceContext.NAMESPACE_URI,
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62 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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63
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64 Element mainvalues = ec.create("mainvalues");
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65 Element riverEl = ec.create("river");
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66 Element startEl = ec.create("start");
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67 Element endEl = ec.create("end");
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68
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69 riverEl.setTextContent(river);
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70 startEl.setTextContent(Double.valueOf(from).toString());
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71 endEl.setTextContent(Double.valueOf(to).toString());
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72
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73 mainvalues.appendChild(riverEl);
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74 mainvalues.appendChild(startEl);
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75 mainvalues.appendChild(endEl);
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76
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77 doc.appendChild(mainvalues);
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78
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79 HttpClient client = new HttpClientImpl(url, locale);
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80
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81 try {
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82 Document result = client.callService(url, "mainvalues", doc);
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83
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84 logger.debug("Extract wq info objects now.");
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85 WQInfoObject[] objects = extractWQInfoObjects(result);
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86
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87 if (objects != null && objects.length > 0) {
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88 return objects;
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89 }
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90 }
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91 catch (ConnectionException ce) {
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92 logger.error(ce, ce);
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93 }
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94
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95 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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96 }
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97
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98
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99 /**
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100 * Extracts all wq info objects from <i>result</i> document.
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101 *
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102 * @param result The document retrieved by the server.
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103 *
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104 * @return a list of WQInfoObjects.
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105 */
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106 protected WQInfoObject[] extractWQInfoObjects(Document result)
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107 throws ServerException
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108 {
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109 NodeList list = (NodeList) XMLUtils.xpath(
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110 result,
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111 XPATH_WQS,
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112 XPathConstants.NODESET,
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113 ArtifactNamespaceContext.INSTANCE);
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114
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115 if (list == null || list.getLength() == 0) {
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116 logger.warn("No wq info found.");
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117
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118 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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119 }
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120
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121 int num = list.getLength();
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122 logger.debug("Response contains " + num + " objects.");
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123
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124 List<WQInfoObject> objects =
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125 new ArrayList<WQInfoObject>(num);
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126
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127 for (int i = 0; i < num; i++) {
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128 WQInfoObject obj = buildWQInfoObject(list.item(i));
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129
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130 if (obj != null) {
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131 objects.add(obj);
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132 }
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133 }
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134
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135 logger.debug("Retrieved " + objects.size() + " wq values");
245
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136
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137 return (WQInfoObject[])
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138 objects.toArray(new WQInfoObject[num]);
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139 }
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140
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141
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142 /**
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143 * Extracts information for a single wq info object and intializes an
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144 * WQInfoObject with them.
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145 *
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146 * @param node The node that contains the information.
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147 *
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148 * @return a valid WQInfoObject.
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149 */
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150 protected WQInfoObject buildWQInfoObject(Node node) {
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151 String name = XMLUtils.xpathString(
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152 node, "@name", ArtifactNamespaceContext.INSTANCE);
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153
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154 String type = XMLUtils.xpathString(
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155 node, "@type", ArtifactNamespaceContext.INSTANCE);
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156
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157 String value = XMLUtils.xpathString(
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158 node, "@value", ArtifactNamespaceContext.INSTANCE);
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159
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160
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161 if (name != null && type != null) {
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162 try {
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163 return new WQInfoObjectImpl(
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164 name,
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165 type,
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166 new Double(value));
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167 }
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168 catch (NumberFormatException nfe) {
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169 logger.warn(nfe.getLocalizedMessage());
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170 }
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171 }
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172
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173 logger.warn("Invalid wq info object found.");
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174
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175 return null;
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176 }
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177 }
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178 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org