Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java @ 3494:4825950acf1e

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Avoid NullPointerException if user authetication is deactivated. If user Authentication is deactivated all rivers are returned. flys-client/trunk@5210 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Bjoern Ricks <bjoern.ricks@intevation.de>
date Wed, 15 Aug 2012 14:20:19 +0000
parents d45fcf70b994
children f1814efec714
rev   line source
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44c63e7fd0d0 Added a service to list the supported rivers of the artifact server. The FLYS instance serves a method that retrieves this list.
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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.List;
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5
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6 import javax.xml.xpath.XPathConstants;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.NodeList;
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10 import org.w3c.dom.Node;
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11
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12 import org.apache.log4j.Logger;
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15 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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16 import de.intevation.artifacts.common.utils.XMLUtils;
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18 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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19 import de.intevation.artifacts.httpclient.http.HttpClient;
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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21
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22 import de.intevation.flys.client.shared.exceptions.ServerException;
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23 import de.intevation.flys.client.shared.model.DefaultRiver;
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24 import de.intevation.flys.client.shared.model.River;
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25 import de.intevation.flys.client.client.services.RiverService;
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27 import de.intevation.flys.client.server.auth.User;
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30 /**
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31 * This interface provides a method to list the supported rivers of the artifact
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32 * server.
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33 *
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34 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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35 */
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36 public class RiverServiceImpl
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37 extends RemoteServiceServlet
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38 implements RiverService
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39 {
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40 /** Private logger. */
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41 private static final Logger logger =
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42 Logger.getLogger(RiverServiceImpl.class);
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43
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44 /** The XPath string that points to the rivers in the resulting document.*/
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45 public static final String XPATH_RIVERS = "/art:rivers/art:river";
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47 /** The error message key that is thrown if an error occured while reading
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48 * the supported rivers from server.*/
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49 public static final String ERROR_NO_RIVERS_FOUND = "error_no_rivers_found";
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52 /** Get river list. */
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53 public River[] list(String locale)
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54 throws ServerException
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55 {
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56 String url = getServletContext().getInitParameter("server-url");
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57
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58 Document doc = XMLUtils.newDocument();
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60 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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61 doc,
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62 ArtifactNamespaceContext.NAMESPACE_URI,
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63 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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64
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65 doc.appendChild(ec.create("action"));
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66
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67 HttpClient client = new HttpClientImpl(url, locale);
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68
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69 try {
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70 Document res = client.callService(url, "rivers", doc);
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72 NodeList rivers = (NodeList) XMLUtils.xpath(
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73 res,
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74 XPATH_RIVERS,
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75 XPathConstants.NODESET,
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76 ArtifactNamespaceContext.INSTANCE);
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78 if (rivers == null || rivers.getLength() == 0) {
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79 throw new ServerException(ERROR_NO_RIVERS_FOUND);
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80 }
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81
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82 int count = rivers.getLength();
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83 int rcount = 0;
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84
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85 List<River> theRivers = new ArrayList<River>(count);
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86 User user = this.getUser();
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87
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88 for (int i = 0; i < count; i++) {
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89 Node tmp = rivers.item(i);
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90
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91 String name = XMLUtils.xpathString(
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92 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
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93
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94 if (user == null || user.canUseFeature("river:" + name)) {
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95 theRivers.add(new DefaultRiver(name));
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96 rcount++;
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97 }
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98 }
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99
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100 return theRivers.toArray(new River[rcount]);
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101 }
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102 catch (ConnectionException ce) {
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103 logger.error(ce, ce);
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104 }
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105
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106 throw new ServerException(ERROR_NO_RIVERS_FOUND);
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44c63e7fd0d0 Added a service to list the supported rivers of the artifact server. The FLYS instance serves a method that retrieves this list.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
107 }
44c63e7fd0d0 Added a service to list the supported rivers of the artifact server. The FLYS instance serves a method that retrieves this list.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
108 }
44c63e7fd0d0 Added a service to list the supported rivers of the artifact server. The FLYS instance serves a method that retrieves this list.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
109 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org