Mercurial > dive4elements > gnv-client

annotate gnv/src/main/java/de/intevation/gnv/artifactdatabase/client/DefaultArtifactDatabaseClient.java @ 2:5e94403971af

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infrastructur for Communicationg with the ArtifactDatabase added. gnv/trunk@71 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Fri, 11 Sep 2009 15:17:38 +0000
parents
children fe6a64545552
rev   line source
2
5e94403971af infrastructur for Communicationg with the ArtifactDatabase added.
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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.w3c.dom.Document;
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34 import org.w3c.dom.Node;
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35 import org.w3c.dom.NodeList;
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36 import org.xml.sax.SAXException;
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37
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38 import de.intevation.gnv.artifactdatabase.client.exception.ArtifactDatabaseClientException;
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39 import de.intevation.gnv.artifactdatabase.objects.ArtifactFactory;
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40 import de.intevation.gnv.artifactdatabase.objects.ArtifactObject;
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41 import de.intevation.gnv.util.XMLUtils;
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42
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43 /**
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44 * @author Tim Englich <tim.englich@intevation.de>
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45 *
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46 */
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47 public class DefaultArtifactDatabaseClient implements ArtifactDatabaseClient {
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48 /**
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49 * the logger, used to log exceptions and additonaly information
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50 */
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51 private static Logger log = Logger.getLogger(DefaultArtifactDatabaseClient.class);
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52
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53 // TODO Container for ArtifactDatabases should be used.
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54 private static Map<String, String> artifactDatabases = null;
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55
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56 private static boolean initialized = false;
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57
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58 /**
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59 * Constructor
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60 */
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61 public DefaultArtifactDatabaseClient() {
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62 super();
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63 }
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64
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65 /**
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66 * @see de.intevation.gnv.artifactdatabase.client.ArtifactDatabaseClient#getArtifactFactories()
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67 */
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68 public Collection<ArtifactObject> getArtifactFactories() throws ArtifactDatabaseClientException {
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69 Collection<ArtifactObject> resultValues = null;
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70 if (!initialized){
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71 this.initialize();
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72 }
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73 try {
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74 XMLUtils xmlUtils = new XMLUtils();
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75 log.debug("DefaultArtifactDatabaseClient.getArtifactFactories");
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76 Iterator<String> it = artifactDatabases.values().iterator();
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77 while (it.hasNext()){
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78 String server = it.next();
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79 String url = server+ "/factories";
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80 InputStream inputStream = this.doGetRequest(url);
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81 Document document = xmlUtils.readDocument(inputStream);
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82 log.debug(xmlUtils.writeDocument2String(document));
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83 if (resultValues == null){
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84 resultValues = this.getArtifactFactories(document,server);
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85 }else{
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86 resultValues.addAll(this.getArtifactFactories(document,server));
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87 }
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88 }
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89 } catch (IOException e) {
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90 log.error(e,e);
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91 }
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92 return resultValues;
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93 }
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94
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95 private Collection<ArtifactObject> getArtifactFactories(Document document, String server){
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96 XMLUtils xmlUtils = new XMLUtils();
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97 NodeList artifactFactories = xmlUtils.getNodeSetXPath(document, "/result/factories/factory");
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98 Collection<ArtifactObject> resultValues = new ArrayList<ArtifactObject>(artifactFactories.getLength());
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99 if (artifactFactories != null){
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100 for (int i = 0; i < artifactFactories.getLength(); i++){
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101 Node artifactFactoryNode = artifactFactories.item(i);
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102 String name = xmlUtils.getStringXPath(artifactFactoryNode, "@name");
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103 String description = xmlUtils.getStringXPath(artifactFactoryNode, "@description");
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104 ArtifactFactory artifactFactory = new ArtifactFactory(name, description, server);
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105 resultValues.add(artifactFactory);
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106 }
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107 }
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108 return resultValues;
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109 }
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110
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111 /**
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112 * @throws IOException
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113 */
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114 private InputStream doGetRequest(String requestUrl) throws IOException {
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115 Client client = new Client(Protocol.HTTP);
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116 Request request = new Request(Method.GET, requestUrl);
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117 Response response = client.handle(request);
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118 Representation output = response.getEntity();
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119 return output.getStream();
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120 }
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121
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122 private synchronized void initialize(){
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123 if (!initialized){
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124 this.artifactDatabases = new HashMap<String, String>();
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125 this.artifactDatabases.put("test", "http://localhost:8181"); // TODO Read from Config
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126 initialized = true;
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127 }
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128
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129 }
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130
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131
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132 }
http://dive4elements.wald.intevation.org