Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 5586:966237892c9b

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Removed obsolete import.
author Sascha L. Teichmann <teichmann@intevation.de>
date Fri, 05 Apr 2013 23:28:56 +0200
parents 4b281c7046c8
children 8fce35702908
rev   line source
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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.Arrays;
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5 import java.util.Comparator;
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6 import java.util.List;
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7
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8 import javax.xml.xpath.XPathConstants;
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9
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10 import org.w3c.dom.Document;
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11 import org.w3c.dom.Element;
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12 import org.w3c.dom.NodeList;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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17
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18 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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19 import de.intevation.artifacts.common.utils.XMLUtils;
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20
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21 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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22 import de.intevation.artifacts.httpclient.http.HttpClient;
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23 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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24
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25 import de.intevation.flys.client.shared.exceptions.ServerException;
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26 import de.intevation.flys.client.client.services.WQInfoService;
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27 import de.intevation.flys.client.shared.model.WQInfoObject;
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28 import de.intevation.flys.client.shared.model.WQInfoObjectImpl;
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29
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30
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31 /**
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class WQInfoServiceImpl
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35 extends RemoteServiceServlet
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36 implements WQInfoService
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37 {
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38 private static final Logger logger =
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39 Logger.getLogger(WQInfoServiceImpl.class);
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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.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 boolean debug = logger.isDebugEnabled();
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123
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124 int num = list.getLength();
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125 if (debug) {
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126 logger.debug("Response contains " + num + " objects.");
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127 }
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128
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129 List<WQInfoObject> objects =
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130 new ArrayList<WQInfoObject>(num);
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131
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132 for (int i = 0; i < num; i++) {
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133 WQInfoObject obj = buildWQInfoObject((Element)list.item(i));
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134
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135 if (obj != null) {
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136 objects.add(obj);
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137 }
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138 }
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139
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140 if (debug) {
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141 logger.debug("Retrieved " + objects.size() + " wq values");
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142 }
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143
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144 WQInfoObject [] array = (WQInfoObject[])
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145 objects.toArray(new WQInfoObject[objects.size()]);
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146
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147 Arrays.sort(array, WQ_INFO_OBJECT_CMP);
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148
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149 return array;
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150 }
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151
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152 public static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP =
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153 new Comparator<WQInfoObject>() {
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154 @Override
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155 public int compare(WQInfoObject a, WQInfoObject b) {
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156
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157 // Descending by type: Qs before Ds
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158 int cmp = a.getType().compareTo(b.getType());
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159 if (cmp < 0) return +1;
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160 if (cmp > 0) return -1;
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161
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162 // Ascending by value
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163 double diff = a.getValue() - b.getValue();
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164 if (diff < 0d) return -1;
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165 if (diff > 0d) return +1;
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166 return 0;
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167 }
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168 };
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169
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170 /**
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171 * Extracts information for a single wq info object and intializes an
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172 * WQInfoObject with them.
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173 *
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174 * @param node The node that contains the information.
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175 *
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176 * @return a valid WQInfoObject.
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177 */
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178 protected static WQInfoObject buildWQInfoObject(Element node) {
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179
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180 String uri = ArtifactNamespaceContext.NAMESPACE_URI;
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181
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182 String name = node.getAttributeNS(uri, "name");
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183 String type = node.getAttributeNS(uri, "type");
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184 String value = node.getAttributeNS(uri, "value");
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185
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186 if (!name.isEmpty() && !type.isEmpty()) {
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187 try {
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188 return new WQInfoObjectImpl(
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189 name,
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190 type,
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191 new Double(value));
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192 }
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193 catch (NumberFormatException nfe) {
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194 logger.warn(nfe.getLocalizedMessage());
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195 }
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196 }
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197
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198 logger.warn("Invalid wq info object found.");
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199
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200 return null;
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201 }
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202 }
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203 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org