Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java @ 547:95a7f9cb3d58

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#131 Repaired a broken XPath expression for the chart attributes. flys-client/trunk@2056 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 06 Jun 2011 11:31:21 +0000
parents 924da6695800
children ab8eb2f544f2
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 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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12 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.XMLUtils;
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17 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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18 import de.intevation.artifacts.httpclient.http.HttpClient;
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19 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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21 import de.intevation.flys.client.shared.exceptions.ServerException;
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22 import de.intevation.flys.client.shared.model.DefaultRiver;
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23 import de.intevation.flys.client.shared.model.River;
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24 import de.intevation.flys.client.client.services.RiverService;
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27 /**
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28 * This interface provides a method to list the supported rivers of the artifact
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29 * server.
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30 *
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31 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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32 */
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33 public class RiverServiceImpl
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34 extends RemoteServiceServlet
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35 implements RiverService
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36 {
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37 /** The XPath string that points to the rivers in the resulting document.*/
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38 public static final String XPATH_RIVERS = "/art:rivers/art:river";
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39
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40 /** The error message key that is thrown if an error occured while reading
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41 * the supported rivers from server.*/
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42 public static final String ERROR_NO_RIVERS_FOUND = "error_no_rivers_found";
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45 public River[] list(String serverUrl, String locale)
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46 throws ServerException
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47 {
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48 Document doc = XMLUtils.newDocument();
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50 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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51 doc,
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52 ArtifactNamespaceContext.NAMESPACE_URI,
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53 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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55 doc.appendChild(ec.create("action"));
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57 HttpClient client = new HttpClientImpl(serverUrl, locale);
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59 try {
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60 Document res = client.callService(serverUrl, "rivers", doc);
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61
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62 NodeList rivers = (NodeList) XMLUtils.xpath(
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63 res,
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64 XPATH_RIVERS,
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65 XPathConstants.NODESET,
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66 ArtifactNamespaceContext.INSTANCE);
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68 if (rivers == null || rivers.getLength() == 0) {
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69 throw new ServerException(ERROR_NO_RIVERS_FOUND);
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70 }
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71
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72 int count = rivers.getLength();
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74 List<River> theRivers = new ArrayList<River>(count);
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75
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76 for (int i = 0; i < count; i++) {
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77 Node tmp = rivers.item(i);
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78
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79 String name = XMLUtils.xpathString(
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80 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
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81
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82 theRivers.add(new DefaultRiver(name));
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83 }
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84
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85 return (River[]) theRivers.toArray(new River[count]);
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86 }
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87 catch (ConnectionException ce) {
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88 System.err.println(ce.getLocalizedMessage());
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89 }
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91 throw new ServerException(ERROR_NO_RIVERS_FOUND);
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92 }
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93 }
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94 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org