Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 5818:a4ff4167be1e

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Request feature info on all layers and show it as html if the server does not return valid gml. Non queryable layers produce an error message when the request fails. This is good enough
author Andre Heinecke <aheinecke@intevation.de>
date Wed, 24 Apr 2013 17:33:27 +0200
parents 8fce35702908
children
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.Node;
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13 import org.w3c.dom.NodeList;
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14
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15 import org.apache.log4j.Logger;
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16
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17 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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18
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19 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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20 import de.intevation.artifacts.common.utils.XMLUtils;
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21
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22 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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23 import de.intevation.artifacts.httpclient.http.HttpClient;
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24 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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25
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26 import de.intevation.flys.client.shared.exceptions.ServerException;
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27 import de.intevation.flys.client.client.services.WQInfoService;
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28 import de.intevation.flys.client.shared.model.WQInfoObject;
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29 import de.intevation.flys.client.shared.model.WQInfoObjectImpl;
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30
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31
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32 /**
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33 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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34 */
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35 public class WQInfoServiceImpl
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36 extends RemoteServiceServlet
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37 implements WQInfoService
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38 {
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39 private static final Logger logger =
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40 Logger.getLogger(WQInfoServiceImpl.class);
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41
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42 public static final String ERROR_NO_WQINFO_FOUND =
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43 "error_no_wqinfo_found";
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44
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45 public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue";
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46
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47
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48 public WQInfoObject[] getWQInfo(
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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 String url = getServletContext().getInitParameter("server-url");
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58
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59 Document doc = XMLUtils.newDocument();
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60
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61 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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62 doc,
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63 ArtifactNamespaceContext.NAMESPACE_URI,
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64 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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65
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66 Element mainvalues = ec.create("mainvalues");
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67 Element riverEl = ec.create("river");
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68 Element startEl = ec.create("start");
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69 Element endEl = ec.create("end");
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70
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71 riverEl.setTextContent(river);
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72 startEl.setTextContent(Double.valueOf(from).toString());
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73 endEl.setTextContent(Double.valueOf(to).toString());
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74
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75 mainvalues.appendChild(riverEl);
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76 mainvalues.appendChild(startEl);
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77 mainvalues.appendChild(endEl);
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78
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79 doc.appendChild(mainvalues);
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80
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81 HttpClient client = new HttpClientImpl(url, locale);
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82
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83 try {
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84 Document result = client.callService(url, "mainvalues", doc);
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85
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86 logger.debug("Extract wq info objects now.");
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87 WQInfoObject[] objects = extractWQInfoObjects(result);
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88
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89 if (objects.length > 0) {
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90 return objects;
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91 }
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92 }
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93 catch (ConnectionException ce) {
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94 logger.error(ce, ce);
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95 }
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96
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97 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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98 }
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99
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100
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101 /**
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102 * Extracts all wq info objects from <i>result</i> document.
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103 *
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104 * @param result The document retrieved by the server.
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105 *
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106 * @return a list of WQInfoObjects.
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107 */
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108 protected WQInfoObject[] extractWQInfoObjects(Document result)
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109 throws ServerException
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110 {
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111 NodeList list = (NodeList) XMLUtils.xpath(
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112 result,
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113 XPATH_WQS,
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114 XPathConstants.NODESET,
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115 ArtifactNamespaceContext.INSTANCE);
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116
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117 if (list == null || list.getLength() == 0) {
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118 logger.warn("No wq info found.");
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119
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120 throw new ServerException(ERROR_NO_WQINFO_FOUND);
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121 }
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122
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123 boolean debug = logger.isDebugEnabled();
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124
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125 int num = list.getLength();
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126 if (debug) {
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127 logger.debug("Response contains " + num + " objects.");
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128 }
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129
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130 List<WQInfoObject> objects =
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131 new ArrayList<WQInfoObject>(num);
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132
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133 for (int i = 0; i < num; i++) {
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134 WQInfoObject obj = buildWQInfoObject(list.item(i));
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135
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136 if (obj != null) {
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137 objects.add(obj);
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138 }
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139 }
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140
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141 if (debug) {
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142 logger.debug("Retrieved " + objects.size() + " wq values");
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143 }
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144
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145 WQInfoObject [] array = (WQInfoObject[])
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146 objects.toArray(new WQInfoObject[objects.size()]);
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147
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148 Arrays.sort(array, WQ_INFO_OBJECT_CMP);
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149
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150 return array;
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151 }
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152
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153 public static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP =
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154 new Comparator<WQInfoObject>() {
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155 @Override
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156 public int compare(WQInfoObject a, WQInfoObject b) {
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157
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158 // Descending by type: Qs before Ds
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159 int cmp = a.getType().compareTo(b.getType());
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160 if (cmp < 0) return +1;
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161 if (cmp > 0) return -1;
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162
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163 // Ascending by value
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164 double diff = a.getValue() - b.getValue();
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165 if (diff < 0d) return -1;
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166 if (diff > 0d) return +1;
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167 return 0;
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168 }
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169 };
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170
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171 /**
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172 * Extracts information for a single wq info object and intializes an
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173 * WQInfoObject with them.
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174 *
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175 * @param node The node that contains the information.
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176 *
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177 * @return a valid WQInfoObject.
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178 */
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179 protected static WQInfoObject buildWQInfoObject(Node node) {
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180
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181 String name = XMLUtils.xpathString(
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182 node, "@name", ArtifactNamespaceContext.INSTANCE);
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183
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184 String type = XMLUtils.xpathString(
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185 node, "@type", ArtifactNamespaceContext.INSTANCE);
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186
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187 String value = XMLUtils.xpathString(
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188 node, "@value", ArtifactNamespaceContext.INSTANCE);
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189
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190 if (name != null && type != null) {
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191 try {
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192 return new WQInfoObjectImpl(
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193 name,
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194 type,
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195 new Double(value));
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196 }
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197 catch (NumberFormatException nfe) {
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198 logger.warn(nfe.getLocalizedMessage());
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199 }
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200 }
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201
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202 logger.warn("Invalid wq info object found.");
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203
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204 return null;
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205 }
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206 }
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207 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org