Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/artifactdatabase/client/DefaultArtifactDatabaseClient.java @ 9:a4cb6d175a6e

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Support for Initial DescribeCall to ArtifactDatabase implemented gnv/trunk@85 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 14 Sep 2009 15:29:38 +0000
parents fe6a64545552
children 3cb753564552
rev   line source
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1 /**
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2 *
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3 */
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4 package de.intevation.gnv.artifactdatabase.client;
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5
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6 import java.io.IOException;
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7 import java.io.InputStream;
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8 import java.io.StringWriter;
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9 import java.util.ArrayList;
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10 import java.util.Collection;
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11 import java.util.HashMap;
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12 import java.util.Iterator;
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13 import java.util.Map;
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14
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15 import javax.xml.parsers.DocumentBuilder;
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16 import javax.xml.parsers.DocumentBuilderFactory;
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17 import javax.xml.parsers.ParserConfigurationException;
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18 import javax.xml.transform.Transformer;
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19 import javax.xml.transform.TransformerConfigurationException;
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20 import javax.xml.transform.TransformerException;
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21 import javax.xml.transform.TransformerFactory;
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22 import javax.xml.transform.TransformerFactoryConfigurationError;
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23 import javax.xml.transform.dom.DOMSource;
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24 import javax.xml.transform.stream.StreamResult;
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25
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26 import org.apache.log4j.Logger;
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27 import org.restlet.Client;
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28 import org.restlet.data.Method;
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29 import org.restlet.data.Protocol;
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30 import org.restlet.data.Request;
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31 import org.restlet.data.Response;
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32 import org.restlet.representation.Representation;
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33 import org.restlet.representation.StringRepresentation;
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34 import org.w3c.dom.Document;
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35 import org.w3c.dom.Element;
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36 import org.w3c.dom.Node;
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37 import org.w3c.dom.NodeList;
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38
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39 import de.intevation.gnv.artifactdatabase.client.exception.ArtifactDatabaseClientException;
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40 import de.intevation.gnv.artifactdatabase.objects.Artifact;
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41 import de.intevation.gnv.artifactdatabase.objects.ArtifactDescription;
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42 import de.intevation.gnv.artifactdatabase.objects.ArtifactFactory;
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43 import de.intevation.gnv.artifactdatabase.objects.ArtifactObject;
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44 import de.intevation.gnv.util.XMLUtils;
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45
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46 /**
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47 * @author Tim Englich <tim.englich@intevation.de>
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48 *
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49 */
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50 public class DefaultArtifactDatabaseClient implements ArtifactDatabaseClient {
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51 /**
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52 * The URI of the namespace of the artifacts.
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53 */
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54 public final static String NAMESPACE_URI = "http://www.intevation.de/2009/artifacts";
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55
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56 /**
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57 * The XML prefix for the artifacts namespace.
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58 */
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59 public final static String NAMESPACE_PREFIX = "art";
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60
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61 /**
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62 * the logger, used to log exceptions and additonaly information
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63 */
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64 private static Logger log = Logger.getLogger(DefaultArtifactDatabaseClient.class);
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65
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66 // TODO Container for ArtifactDatabases should be used.
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67 private static Map<String, String> artifactDatabases = null;
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68
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69 private static boolean initialized = false;
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70
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71 /**
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72 * Constructor
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73 */
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74 public DefaultArtifactDatabaseClient() {
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75 super();
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76 }
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77
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78 /**
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79 * @see de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClient#getArtifactFactories()
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80 */
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81 public Collection<ArtifactObject> getArtifactFactories() throws ArtifactDatabaseClientException {
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82 Collection<ArtifactObject> resultValues = null;
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83 if (!initialized){
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84 this.initialize();
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85 }
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86 try {
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87 XMLUtils xmlUtils = new XMLUtils();
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88 log.debug("DefaultArtifactDatabaseClient.getArtifactFactories");
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89 Iterator<String> it = artifactDatabases.values().iterator();
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90 while (it.hasNext()){
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91 String server = it.next();
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92 String url = server+ "/factories";
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93 Document document = this.doGetRequest(url);
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94 if (resultValues == null){
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95 resultValues = this.getArtifactFactories(document,server);
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96 }else{
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97 resultValues.addAll(this.getArtifactFactories(document,server));
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98 }
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99 }
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100 } catch (IOException e) {
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101 log.error(e,e);
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102 }
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103 return resultValues;
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104 }
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105
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106 private Collection<ArtifactObject> getArtifactFactories(Document document, String server){
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107 XMLUtils xmlUtils = new XMLUtils();
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108 NodeList artifactFactories = xmlUtils.getNodeSetXPath(document, "/result/factories/factory");
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109 Collection<ArtifactObject> resultValues = new ArrayList<ArtifactObject>(artifactFactories.getLength());
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110 if (artifactFactories != null){
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111 for (int i = 0; i < artifactFactories.getLength(); i++){
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112 Node artifactFactoryNode = artifactFactories.item(i);
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113 String name = xmlUtils.getStringXPath(artifactFactoryNode, "@name");
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114 String description = xmlUtils.getStringXPath(artifactFactoryNode, "@description");
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115 ArtifactFactory artifactFactory = new ArtifactFactory(name, description, server);
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116 resultValues.add(artifactFactory);
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117 }
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118 }
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119 return resultValues;
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120 }
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121
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122 /**
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123 * @throws IOException
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124 */
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125 private Document doGetRequest(String requestUrl) throws IOException {
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126 XMLUtils xmlUtils = new XMLUtils();
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127 Client client = new Client(Protocol.HTTP);
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128 Response response = client.get(requestUrl);
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129 Representation output = response.getEntity();
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130 Document document = xmlUtils.readDocument(output.getStream());
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131 log.debug(xmlUtils.writeDocument2String(document));
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132 return document;
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133 }
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134
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135 /**
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136 * @throws IOException
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137 */
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138 private InputStream doPostRequest(String requestUrl, Document requestBody) throws IOException {
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139 Client client = new Client(Protocol.HTTP);
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140 Request request = new Request(Method.POST, requestUrl);
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141 String documentBody = new XMLUtils().writeDocument2String(requestBody);
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142 Representation representation = new StringRepresentation(documentBody);
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143 request.setEntity(representation);
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144 Response response = client.handle(request);
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145 Representation output = response.getEntity();
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146 return output.getStream();
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147 }
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148
2
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149 private synchronized void initialize(){
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150 if (!initialized){
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151 this.artifactDatabases = new HashMap<String, String>();
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152 this.artifactDatabases.put("test", "http://localhost:8181"); // TODO Read from Config
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153 initialized = true;
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154 }
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155
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156 }
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157
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158 /**
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159 * @see de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClient#createNewArtifact(de.intevation.gnv.artifactdatabase.objects.ArtifactObject)
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160 */
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161 public ArtifactObject createNewArtifact(ArtifactObject artifactFactory)
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162 throws ArtifactDatabaseClientException {
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163
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164 try {
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165 Document request = this.createCreateRequestBody(artifactFactory.getId());
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166 Document result = doPostRequest(artifactFactory, request, "create");
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167 return this.getArtifact(result);
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168 } catch (IOException e) {
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169 log.error(e,e);
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170 throw new ArtifactDatabaseClientException(e);
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171 }
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172 }
2
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173
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174
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175 private ArtifactObject getArtifact(Document document){
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176 XMLUtils xmlUtils = new XMLUtils();
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177 String uuid = xmlUtils.getStringXPath(document, "/result/uuid/@value");
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178 String hash = xmlUtils.getStringXPath(document, "/result/hash/@value");
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179 log.info("NEW Artifact: "+uuid+" / "+hash);
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180 return new Artifact(uuid, hash);
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181 }
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182
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183
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184
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185
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186 private Document createCreateRequestBody(String artifactFactoryName){
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187 Document document = new XMLUtils().newDocument();
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188 Node rootNode = this.createRootNode(document);
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189 Element typeNode = this.createArtifactElement(document, "type");
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190 typeNode.setAttribute("name", "create");
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191 rootNode.appendChild(typeNode);
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192
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193 Element factoyNode = this.createArtifactElement(document, "factory");
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194 factoyNode.setAttribute("name", artifactFactoryName);
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195 rootNode.appendChild(factoyNode);
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196
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197 return document;
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198 }
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199
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200 private Element createRootNode(Document document){
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201 Element rootNode = this.createArtifactElement(document,"action");
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202 document.appendChild(rootNode);
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203 return rootNode;
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204 }
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205
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206 /**
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207 * @param document
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208 * @return
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209 */
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210 private Element createArtifactElement(Document document, String name) {
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211 Element node = document.createElementNS(NAMESPACE_URI, name);
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212 node.setPrefix(NAMESPACE_PREFIX);
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213 return node;
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214 }
9
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215
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216 /**
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217 * @param artifactFactory
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218 * @param xmlUtils
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219 * @param request
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220 * @throws IOException
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221 */
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222 private Document doPostRequest(ArtifactObject artifactFactory,
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223 Document request, String suburl) throws IOException {
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224 XMLUtils xmlUtils = new XMLUtils();
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225 String url = ((ArtifactFactory)artifactFactory).getDataBaseUrl();
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226 InputStream is = this.doPostRequest(url+"/"+suburl, request);
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227 Document result = xmlUtils.readDocument(is);
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228 // TODO: Fehleranalyse des Dokumentes
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229 log.debug(xmlUtils.writeDocument2String(result));
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230 return result;
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231 }
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232
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233 private Document createDescribeRequestBody(ArtifactObject currentArtifact){
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234 Document document = new XMLUtils().newDocument();
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235 Node rootNode = this.createRootNode(document);
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236 Element typeNode = this.createArtifactElement(document, "type");
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237 typeNode.setAttribute("name", "describe");
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238 rootNode.appendChild(typeNode);
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239
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240 Element uuidNode = this.createArtifactElement(document, "uuid");
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241 uuidNode.setAttribute("value", currentArtifact.getId());
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242 rootNode.appendChild(uuidNode);
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243
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244 Element hashNode = this.createArtifactElement(document, "hash");
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245 hashNode.setAttribute("value", currentArtifact.getHash());
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246 rootNode.appendChild(hashNode);
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247
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248 return document;
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249 }
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250
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251 /**
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252 * @see de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClient#getCurrentStepDescription(de.intevation.gnv.artifactdatabase.objects.ArtifactFactory, de.intevation.gnv.artifactdatabase.objects.ArtifactObject)
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253 */
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254 public ArtifactDescription getCurrentStepDescription(ArtifactObject artifactFactory,
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255 ArtifactObject currentArtifact)
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256 throws ArtifactDatabaseClientException {
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257 try {
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258
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259 Document request = this.createDescribeRequestBody(currentArtifact);
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260 String url = ((ArtifactFactory)artifactFactory).getDataBaseUrl()+"/artifact/"+ currentArtifact.getId();
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261 Document result = this.doGetRequest(url);
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262 return this.readDescription(result,currentArtifact);
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diff changeset
263 } catch (IOException e) {
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264 log.error(e,e);
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265 throw new ArtifactDatabaseClientException(e);
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266 }
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267 }
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268
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269 private ArtifactDescription readDescription(Document document, ArtifactObject artifact) throws ArtifactDatabaseClientException{
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270 XMLUtils xmlUtils = new XMLUtils();
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271 if (artifact instanceof ArtifactDescription){
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272 ArtifactDescription ad = (ArtifactDescription)artifact;
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273 Node uiNode = xmlUtils.getNodeXPath(document, "/result/ui");
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diff changeset
274 Node outputNode = xmlUtils.getNodeXPath(document, "/result/outputs");
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diff changeset
275 String currentState = xmlUtils.getStringXPath(document, "/result/state/@name");
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diff changeset
276 NodeList statesList = xmlUtils.getNodeSetXPath(document, "/result/reachable-states/state/@name");
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diff changeset
277 Collection<String> reachableStates = new ArrayList<String>(statesList.getLength());
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diff changeset
278 for (int i = 0; i < statesList.getLength(); i++){
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279 reachableStates.add(statesList.item(i).getNodeValue());
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280 }
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281
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282 ad.setCurrentOut(outputNode);
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283 ad.setCurrentUI(uiNode);
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284 ad.setCurrentState(currentState);
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285 ad.setReachableStates(reachableStates);
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286 return ad;
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287 }else{
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288 log.error("Artifact must be Instance of ArtifactDescription");
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289 throw new ArtifactDatabaseClientException("Artifact must be Instance of ArtifactDescription");
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290 }
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291
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292
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293 }
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294
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295
2
5e94403971af infrastructur for Communicationg with the ArtifactDatabase added.
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296
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297 }
http://dive4elements.wald.intevation.org