Mercurial > dive4elements > river
comparison flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java @ 29:44c63e7fd0d0
Added a service to list the supported rivers of the artifact server. The FLYS instance serves a method that retrieves this list.
flys-client/trunk@1431 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Wed, 09 Mar 2011 08:00:06 +0000 |
| parents | |
| children | 907b61e4d702 |
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| 28:dfdb927b137d | 29:44c63e7fd0d0 |
|---|---|
| 1 package de.intevation.flys.client.server; | |
| 2 | |
| 3 import java.util.ArrayList; | |
| 4 import java.util.List; | |
| 5 | |
| 6 import javax.xml.xpath.XPathConstants; | |
| 7 | |
| 8 import org.w3c.dom.Document; | |
| 9 import org.w3c.dom.NodeList; | |
| 10 import org.w3c.dom.Node; | |
| 11 | |
| 12 import com.google.gwt.user.server.rpc.RemoteServiceServlet; | |
| 13 | |
| 14 import de.intevation.artifacts.common.ArtifactNamespaceContext; | |
| 15 import de.intevation.artifacts.common.utils.XMLUtils; | |
| 16 | |
| 17 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; | |
| 18 import de.intevation.artifacts.httpclient.http.HttpClient; | |
| 19 import de.intevation.artifacts.httpclient.http.HttpClientImpl; | |
| 20 | |
| 21 import de.intevation.flys.client.shared.model.DefaultRiver; | |
| 22 import de.intevation.flys.client.shared.model.River; | |
| 23 import de.intevation.flys.client.client.services.RiverService; | |
| 24 | |
| 25 | |
| 26 /** | |
| 27 * This interface provides a method to list the supported rivers of the artifact | |
| 28 * server. | |
| 29 * | |
| 30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
| 31 */ | |
| 32 public class RiverServiceImpl | |
| 33 extends RemoteServiceServlet | |
| 34 implements RiverService | |
| 35 { | |
| 36 /** The XPath string that points to the rivers in the resulting document.*/ | |
| 37 public static final String XPATH_RIVERS = "/art:rivers/art:river"; | |
| 38 | |
| 39 | |
| 40 public River[] list(String serverUrl) { | |
| 41 Document doc = XMLUtils.newDocument(); | |
| 42 | |
| 43 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( | |
| 44 doc, | |
| 45 ArtifactNamespaceContext.NAMESPACE_URI, | |
| 46 ArtifactNamespaceContext.NAMESPACE_PREFIX); | |
| 47 | |
| 48 doc.appendChild(ec.create("action")); | |
| 49 | |
| 50 HttpClient client = new HttpClientImpl(serverUrl); | |
| 51 | |
| 52 try { | |
| 53 Document res = client.callService(serverUrl, "rivers", doc); | |
| 54 | |
| 55 NodeList rivers = (NodeList) XMLUtils.xpath( | |
| 56 res, | |
| 57 XPATH_RIVERS, | |
| 58 XPathConstants.NODESET, | |
| 59 ArtifactNamespaceContext.INSTANCE); | |
| 60 | |
| 61 int count = rivers.getLength(); | |
| 62 | |
| 63 List<River> theRivers = new ArrayList<River>(count); | |
| 64 | |
| 65 for (int i = 0; i < count; i++) { | |
| 66 Node tmp = rivers.item(i); | |
| 67 | |
| 68 String name = XMLUtils.xpathString( | |
| 69 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE); | |
| 70 | |
| 71 theRivers.add(new DefaultRiver(name)); | |
| 72 } | |
| 73 | |
| 74 return (River[]) theRivers.toArray(new River[count]); | |
| 75 } | |
| 76 catch (ConnectionException ce) { | |
| 77 System.err.println(ce.getLocalizedMessage()); | |
| 78 } | |
| 79 | |
| 80 return null; | |
| 81 } | |
| 82 } | |
| 83 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |