Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 605:9e30c776cbef

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Improved the exception handling. flys-client/trunk@2212 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 23 Jun 2011 09:22:54 +0000
parents 1e73d5a4859c
children ab8eb2f544f2
rev   line source
245
1e73d5a4859c Added new WQ info service and data structures.
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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 com.google.gwt.user.server.rpc.RemoteServiceServlet;
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14
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15 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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16 import de.intevation.artifacts.common.utils.XMLUtils;
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17
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18 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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19 import de.intevation.artifacts.httpclient.http.HttpClient;
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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21
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22 import de.intevation.flys.client.shared.exceptions.ServerException;
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23 import de.intevation.flys.client.client.services.WQInfoService;
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24 import de.intevation.flys.client.shared.model.WQInfoObject;
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25 import de.intevation.flys.client.shared.model.WQInfoObjectImpl;
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26
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27
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28 /**
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 */
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31 public class WQInfoServiceImpl
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32 extends RemoteServiceServlet
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33 implements WQInfoService
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34 {
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35 public static final String ERROR_NO_WQINFO_FOUND =
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36 "error_no_wqinfo_found";
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37
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38 public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue";
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39
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40
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41 public WQInfoObject[] getWQInfo(
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42 String url,
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43 String locale,
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44 String river,
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45 double from,
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46 double to)
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47 throws ServerException
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48 {
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49 System.out.println("WQInfoServiceImpl.getWQInfo");
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50
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51 Document doc = XMLUtils.newDocument();
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52
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53 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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54 doc,
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55 ArtifactNamespaceContext.NAMESPACE_URI,
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56 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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57
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58 Element mainvalues = ec.create("mainvalues");
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59 Element riverEl = ec.create("river");
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60 Element startEl = ec.create("start");
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61 Element endEl = ec.create("end");
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62
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63 riverEl.setTextContent(river);
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64 startEl.setTextContent(Double.valueOf(from).toString());
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65 endEl.setTextContent(Double.valueOf(to).toString());
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66
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67 mainvalues.appendChild(riverEl);
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68 mainvalues.appendChild(startEl);
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69 mainvalues.appendChild(endEl);
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70
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71 doc.appendChild(mainvalues);
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72
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73 HttpClient client = new HttpClientImpl(url, locale);
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74
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75 try {
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76 Document result = client.callService(url, "mainvalues", doc);
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77
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78 System.out.println("Extract wq info objects now.");
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79 WQInfoObject[] objects = extractWQInfoObjects(result);
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80
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81 if (objects != null && objects.length > 0) {
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82 return objects;
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83 }
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84 }
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85 catch (ConnectionException ce) {
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86 System.err.println(ce.getLocalizedMessage());
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87 }
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88
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89 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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90 }
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91
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92
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93 /**
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94 * Extracts all wq info objects from <i>result</i> document.
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95 *
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96 * @param result The document retrieved by the server.
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97 *
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98 * @return a list of WQInfoObjects.
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99 */
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100 protected WQInfoObject[] extractWQInfoObjects(Document result)
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101 throws ServerException
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102 {
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103 NodeList list = (NodeList) XMLUtils.xpath(
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104 result,
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105 XPATH_WQS,
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106 XPathConstants.NODESET,
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107 ArtifactNamespaceContext.INSTANCE);
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108
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109 if (list == null || list.getLength() == 0) {
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110 System.err.println("No wq info found.");
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111
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112 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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113 }
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114
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115 int num = list.getLength();
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116 System.out.println("Response contains " + num + " objects.");
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117
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118 List<WQInfoObject> objects =
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119 new ArrayList<WQInfoObject>(num);
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120
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121 for (int i = 0; i < num; i++) {
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122 WQInfoObject obj = buildWQInfoObject(list.item(i));
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123
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124 if (obj != null) {
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125 objects.add(obj);
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126 }
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127 }
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128
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129 System.out.println("Retrieved " + objects.size() + " wq values");
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130
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131 return (WQInfoObject[])
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132 objects.toArray(new WQInfoObject[num]);
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133 }
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134
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135
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136 /**
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137 * Extracts information for a single wq info object and intializes an
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138 * WQInfoObject with them.
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139 *
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140 * @param node The node that contains the information.
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141 *
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142 * @return a valid WQInfoObject.
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143 */
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144 protected WQInfoObject buildWQInfoObject(Node node) {
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145 String name = XMLUtils.xpathString(
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146 node, "@name", ArtifactNamespaceContext.INSTANCE);
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147
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148 String type = XMLUtils.xpathString(
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149 node, "@type", ArtifactNamespaceContext.INSTANCE);
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150
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151 String value = XMLUtils.xpathString(
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152 node, "@value", ArtifactNamespaceContext.INSTANCE);
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153
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154
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155 if (name != null && type != null) {
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156 try {
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157 return new WQInfoObjectImpl(
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158 name,
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159 type,
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160 new Double(value));
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161 }
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162 catch (NumberFormatException nfe) {
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163 System.err.println(nfe.getLocalizedMessage());
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164 }
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165 }
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166
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167 System.err.println("Invalid wq info object found.");
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168
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169 return null;
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170 }
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171 }
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172 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org