Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java @ 4703:38ec171544de

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Work on rivers.map Generator.
author Christian Lins <christian.lins@intevation.de>
date Tue, 18 Dec 2012 15:46:36 +0100
parents fed914a42a10
children
rev   line source
29
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 de.intevation.artifacts.common.ArtifactNamespaceContext;
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4 import de.intevation.artifacts.common.utils.XMLUtils;
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5 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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6 import de.intevation.artifacts.httpclient.http.HttpClient;
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7 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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8 import de.intevation.flys.client.client.services.RiverService;
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9 import de.intevation.flys.client.server.auth.User;
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10 import de.intevation.flys.client.shared.exceptions.ServerException;
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11 import de.intevation.flys.client.shared.model.DefaultRiver;
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12 import de.intevation.flys.client.shared.model.River;
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14 import java.util.ArrayList;
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15 import java.util.List;
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17 import javax.xml.xpath.XPathConstants;
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19 import org.apache.log4j.Logger;
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20 import org.w3c.dom.Document;
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21 import org.w3c.dom.Element;
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22 import org.w3c.dom.NodeList;
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25 /**
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26 * This interface provides a method to list the supported rivers of the artifact
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27 * server.
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28 *
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 */
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31 public class RiverServiceImpl
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32 extends RemoteServiceServlet
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33 implements RiverService
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34 {
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35 /** Private logger. */
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36 private static final Logger logger =
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37 Logger.getLogger(RiverServiceImpl.class);
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38
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39 /** The XPath string that points to the rivers in the resulting document.*/
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40 public static final String XPATH_RIVERS = "/art:rivers/art:river";
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42 /** The error message key that is thrown if an error occured while reading
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43 * the supported rivers from server.*/
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44 public static final String ERROR_NO_RIVERS_FOUND = "error_no_rivers_found";
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47 /** Get river list. */
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48 @Override
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49 public River[] list(String locale)
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50 throws ServerException
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51 {
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52 String url = getServletContext().getInitParameter("server-url");
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53
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54 Document doc = XMLUtils.newDocument();
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56 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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57 doc,
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58 ArtifactNamespaceContext.NAMESPACE_URI,
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59 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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61 doc.appendChild(ec.create("action"));
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62
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63 HttpClient client = new HttpClientImpl(url, locale);
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64
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65 try {
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66 Document res = client.callService(url, "rivers", doc);
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68 NodeList rivers = (NodeList) XMLUtils.xpath(
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69 res,
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70 XPATH_RIVERS,
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71 XPathConstants.NODESET,
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72 ArtifactNamespaceContext.INSTANCE);
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74 if (rivers == null || rivers.getLength() == 0) {
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75 throw new ServerException(ERROR_NO_RIVERS_FOUND);
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76 }
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78 int count = rivers.getLength();
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79
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80 List<River> theRivers = new ArrayList<River>(count);
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81 User user = this.getUser();
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82
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83 for (int i = 0; i < count; i++) {
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84 Element tmp = (Element)rivers.item(i);
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85
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86 String name = tmp.getAttributeNS(
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87 ArtifactNamespaceContext.NAMESPACE_URI, "name");
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88
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89 if (name.length() > 0
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90 && (user == null || user.canUseFeature("river:" + name))) {
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91 theRivers.add(new DefaultRiver(name));
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92 }
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93 }
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94
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95 return theRivers.toArray(new River[theRivers.size()]);
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96 }
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97 catch (ConnectionException ce) {
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98 logger.error(ce, ce);
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99 }
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101 throw new ServerException(ERROR_NO_RIVERS_FOUND);
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102 }
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103 }
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104 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org