Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/server/StepForwardServiceImpl.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
172338b1407f GWT client: Added copyright header.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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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 org.w3c.dom.Document;
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12
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13 import org.apache.log4j.Logger;
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15 import org.dive4elements.artifacts.common.ArtifactNamespaceContext;
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16 import org.dive4elements.artifacts.common.utils.ClientProtocolUtils;
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17 import org.dive4elements.artifacts.common.utils.XMLUtils;
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18
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19 import org.dive4elements.artifacts.httpclient.exceptions.ConnectionException;
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20 import org.dive4elements.artifacts.httpclient.http.HttpClient;
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21 import org.dive4elements.artifacts.httpclient.http.HttpClientImpl;
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22 import org.dive4elements.artifacts.httpclient.http.response.DocumentResponseHandler;
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23
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24 import org.dive4elements.river.client.shared.exceptions.ServerException;
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25 import org.dive4elements.river.client.shared.model.Artifact;
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26 import org.dive4elements.river.client.shared.model.ArtifactDescription;
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27 import org.dive4elements.river.client.shared.model.Data;
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28 import org.dive4elements.river.client.shared.model.DataItem;
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29 import org.dive4elements.river.client.client.services.StepForwardService;
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32 /**
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33 * This interface provides a method that bundles the artifact specific
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34 * operations FEED and ADVANCE.
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35 *
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36 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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37 */
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38 public class StepForwardServiceImpl
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39 extends AdvanceServiceImpl
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40 implements StepForwardService
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41 {
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42 private static final Logger logger =
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43 Logger.getLogger(StepForwardServiceImpl.class);
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44
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45
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46 /** XPath that points to the result type of a feed or advance operation.*/
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47 public static final String XPATH_RESULT = "/art:result/@art:type";
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48
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49 /** XPath that points to the result type of a feed or advance operation.*/
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50 public static final String XPATH_RESULT_MSG = "/art:result/text()";
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51
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52 /** A constant that marks errors.*/
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53 public static final String OPERATION_FAILURE = "FAILURE";
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54
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55 /** The error message key that is thrown if an error occured while feeding
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56 * new data.*/
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57 public static final String ERROR_FEED_DATA = "error_feed_data";
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58
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59
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60 /**
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61 * This method wraps the artifact operations FEED and ADVANCE. FEED is
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62 * always triggerd, ADVANCE only, if there is at least one reachable state.
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63 *
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64 * @param locale The locale used for the request.
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65 * @param artifact The artifact that needs to be fed.
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66 * @param data An array of Data objects that contain the information that
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67 *
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68 * @return the modified artifact.
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69 */
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70 public Artifact go(String locale, Artifact artifact, Data[] data)
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71 throws ServerException
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72 {
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73 logger.info("StepForwardServiceImpl.go");
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74
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75 String url = getServletContext().getInitParameter("server-url");
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76
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77 Artifact afterFeed = feed(url, locale, artifact, data);
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78
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79 if (afterFeed == null) {
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80 logger.warn("StepForwardService.feed() - FAILED");
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81 throw new ServerException(ERROR_FEED_DATA);
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82 }
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83
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84 ArtifactDescription desc = afterFeed.getArtifactDescription();
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85 String[] reachable = desc.getReachableStates();
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86
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87 if (reachable == null || reachable.length == 0) {
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88 logger.debug("Did not find any reachable state.");
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89 return afterFeed;
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90 }
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91
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92 // We use the first reachable state as default target, maybe we need to
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93 // change this later.
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94 return advance(locale, afterFeed, reachable[0]);
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95 }
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96
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97
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98 /**
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99 * This method triggers the FEED operation.
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100 *
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101 * @param url The url of the artifact server.
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102 * @param artifact The artifact that needs to be fed.
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103 * @param data An array of Data objects that contain the information that
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104 * are used for the FEED operation.
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105 *
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106 * @return a new artifact parsed from the description of FEED.
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107 */
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108 protected Artifact feed(
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109 String url,
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110 String locale,
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111 Artifact artifact,
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112 Data[] data)
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113 throws ServerException
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114 {
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115 logger.info("StepForwardServiceImpl.feed");
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116
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117 Document feed = ClientProtocolUtils.newFeedDocument(
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118 artifact.getUuid(),
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119 artifact.getHash(),
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120 createKVP(data));
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121
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122 HttpClient client = new HttpClientImpl(url, locale);
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123
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124 try {
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125 Document description = (Document) client.feed(
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126 new org.dive4elements.artifacts.httpclient.objects.Artifact(
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127 artifact.getUuid(),
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128 artifact.getHash()),
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129 feed,
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130 new DocumentResponseHandler());
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131
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132 if (description == null) {
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133 logger.warn("StepForwardService.feed() - FAILED");
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134 throw new ServerException(ERROR_FEED_DATA);
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135 }
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136
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137 String result = XMLUtils.xpathString(
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138 description,
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139 XPATH_RESULT,
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140 ArtifactNamespaceContext.INSTANCE);
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141
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142 if (result == null || !result.equals(OPERATION_FAILURE)) {
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143 logger.debug("StepForwardService.feed() - SUCCESS");
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144 return (Artifact) new FLYSArtifactCreator().create(description);
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145 }
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146 else if (result != null && result.equals(OPERATION_FAILURE)) {
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147 String msg = XMLUtils.xpathString(
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148 description,
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149 XPATH_RESULT_MSG,
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150 ArtifactNamespaceContext.INSTANCE);
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151 throw new ServerException(msg);
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152 }
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153 }
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154 catch (ConnectionException ce) {
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155 logger.error(ce, ce);
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156 }
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157
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158 logger.warn("StepForwardService.feed() - FAILED");
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159 throw new ServerException(ERROR_FEED_DATA);
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160 }
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161
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162
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163 /**
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164 * This method creates an array of key/value pairs from an array of Data
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165 * objects. The string array is used as parameter for the feed() operation.
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166 *
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167 * @param data The data that should be transformed into the string array.
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168 *
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169 * @return a string array that contains key/value pairs.
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170 */
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171 protected String[][] createKVP(Data[] data) {
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172 String[][] kvp = new String[data.length][];
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173
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174 int i = 0;
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175
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176 for (Data d: data) {
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177 DataItem[] items = d.getItems();
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178 String key = d.getLabel();
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179 String value = d.getStringValue();
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180
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181 kvp[i++] = new String[] { key, value };
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182 }
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183
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184 return kvp;
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185 }
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186 }
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org