Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/WQInfoServiceImpl.java @ 5861:172338b1407f

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GWT client: Added copyright header.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:30:15 +0200
parents 5aa05a7a34b7
children ea9eef426962
rev   line source
5861
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.client.server;
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10
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11 import java.util.ArrayList;
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12 import java.util.Arrays;
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13 import java.util.Comparator;
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14 import java.util.List;
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15
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16 import javax.xml.xpath.XPathConstants;
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17
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18 import org.w3c.dom.Document;
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19 import org.w3c.dom.Element;
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20 import org.w3c.dom.Node;
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21 import org.w3c.dom.NodeList;
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22
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23 import org.apache.log4j.Logger;
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24
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25 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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26
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27 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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28 import org.dive4elements.artifacts.common.utils.XMLUtils;
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29
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30 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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31 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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32 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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33
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34 import org.dive4elements.river.client.shared.exceptions.ServerException;
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35 import org.dive4elements.river.client.client.services.WQInfoService;
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36 import org.dive4elements.river.client.shared.model.WQInfoObject;
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37 import org.dive4elements.river.client.shared.model.WQInfoObjectImpl;
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38
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39
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40 /**
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41 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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42 */
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43 public class WQInfoServiceImpl
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44 extends RemoteServiceServlet
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45 implements WQInfoService
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46 {
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47 private static final Logger logger =
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48 Logger.getLogger(WQInfoServiceImpl.class);
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49
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50 public static final String ERROR_NO_WQINFO_FOUND =
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51 "error_no_wqinfo_found";
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52
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53 public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue";
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54
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55
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56 public WQInfoObject[] getWQInfo(
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57 String locale,
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58 String river,
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59 double from,
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60 double to)
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61 throws ServerException
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62 {
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63 logger.info("WQInfoServiceImpl.getWQInfo");
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64
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65 String url = getServletContext().getInitParameter("server-url");
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66
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67 Document doc = XMLUtils.newDocument();
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68
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69 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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70 doc,
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71 ArtifactNamespaceContext.NAMESPACE_URI,
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72 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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73
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74 Element mainvalues = ec.create("mainvalues");
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75 Element riverEl = ec.create("river");
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76 Element startEl = ec.create("start");
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77 Element endEl = ec.create("end");
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78
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79 riverEl.setTextContent(river);
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80 startEl.setTextContent(Double.valueOf(from).toString());
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81 endEl.setTextContent(Double.valueOf(to).toString());
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82
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83 mainvalues.appendChild(riverEl);
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84 mainvalues.appendChild(startEl);
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85 mainvalues.appendChild(endEl);
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86
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87 doc.appendChild(mainvalues);
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88
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89 HttpClient client = new HttpClientImpl(url, locale);
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90
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91 try {
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92 Document result = client.callService(url, "mainvalues", doc);
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93
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94 logger.debug("Extract wq info objects now.");
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95 WQInfoObject[] objects = extractWQInfoObjects(result);
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96
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97 if (objects.length > 0) {
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98 return objects;
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99 }
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100 }
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101 catch (ConnectionException ce) {
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102 logger.error(ce, ce);
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103 }
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104
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105 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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106 }
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107
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108
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109 /**
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110 * Extracts all wq info objects from <i>result</i> document.
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111 *
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112 * @param result The document retrieved by the server.
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113 *
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114 * @return a list of WQInfoObjects.
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115 */
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116 protected WQInfoObject[] extractWQInfoObjects(Document result)
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117 throws ServerException
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118 {
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119 NodeList list = (NodeList) XMLUtils.xpath(
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120 result,
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121 XPATH_WQS,
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122 XPathConstants.NODESET,
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123 ArtifactNamespaceContext.INSTANCE);
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124
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125 if (list == null || list.getLength() == 0) {
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126 logger.warn("No wq info found.");
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127
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128 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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129 }
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130
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131 boolean debug = logger.isDebugEnabled();
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132
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133 int num = list.getLength();
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134 if (debug) {
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135 logger.debug("Response contains " + num + " objects.");
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136 }
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137
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138 List<WQInfoObject> objects =
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139 new ArrayList<WQInfoObject>(num);
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140
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141 for (int i = 0; i < num; i++) {
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142 WQInfoObject obj = buildWQInfoObject(list.item(i));
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143
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144 if (obj != null) {
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145 objects.add(obj);
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146 }
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147 }
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148
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149 if (debug) {
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150 logger.debug("Retrieved " + objects.size() + " wq values");
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151 }
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152
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153 WQInfoObject [] array = (WQInfoObject[])
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154 objects.toArray(new WQInfoObject[objects.size()]);
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155
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156 Arrays.sort(array, WQ_INFO_OBJECT_CMP);
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157
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158 return array;
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159 }
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160
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161 public static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP =
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162 new Comparator<WQInfoObject>() {
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163 @Override
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164 public int compare(WQInfoObject a, WQInfoObject b) {
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165
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166 // Descending by type: Qs before Ds
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167 int cmp = a.getType().compareTo(b.getType());
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168 if (cmp < 0) return +1;
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169 if (cmp > 0) return -1;
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170
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171 // Ascending by value
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172 double diff = a.getValue() - b.getValue();
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173 if (diff < 0d) return -1;
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174 if (diff > 0d) return +1;
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175 return 0;
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176 }
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177 };
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178
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179 /**
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180 * Extracts information for a single wq info object and intializes an
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181 * WQInfoObject with them.
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182 *
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183 * @param node The node that contains the information.
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184 *
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185 * @return a valid WQInfoObject.
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186 */
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187 protected static WQInfoObject buildWQInfoObject(Node node) {
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188
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189 String name = XMLUtils.xpathString(
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190 node, "@name", ArtifactNamespaceContext.INSTANCE);
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191
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192 String type = XMLUtils.xpathString(
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193 node, "@type", ArtifactNamespaceContext.INSTANCE);
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194
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195 String value = XMLUtils.xpathString(
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196 node, "@value", ArtifactNamespaceContext.INSTANCE);
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197
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198 if (name != null && type != null) {
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199 try {
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200 return new WQInfoObjectImpl(
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201 name,
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202 type,
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203 new Double(value));
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204 }
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205 catch (NumberFormatException nfe) {
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206 logger.warn(nfe.getLocalizedMessage());
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207 }
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208 }
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209
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210 logger.warn("Invalid wq info object found.");
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211
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212 return null;
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213 }
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214 }
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215 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org