Mercurial > dive4elements > river
diff 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> |
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date | Wed, 09 Mar 2011 08:00:06 +0000 |
parents | |
children | 907b61e4d702 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/de/intevation/flys/client/server/RiverServiceImpl.java Wed Mar 09 08:00:06 2011 +0000 @@ -0,0 +1,83 @@ +package de.intevation.flys.client.server; + +import java.util.ArrayList; +import java.util.List; + +import javax.xml.xpath.XPathConstants; + +import org.w3c.dom.Document; +import org.w3c.dom.NodeList; +import org.w3c.dom.Node; + +import com.google.gwt.user.server.rpc.RemoteServiceServlet; + +import de.intevation.artifacts.common.ArtifactNamespaceContext; +import de.intevation.artifacts.common.utils.XMLUtils; + +import de.intevation.artifacts.httpclient.exceptions.ConnectionException; +import de.intevation.artifacts.httpclient.http.HttpClient; +import de.intevation.artifacts.httpclient.http.HttpClientImpl; + +import de.intevation.flys.client.shared.model.DefaultRiver; +import de.intevation.flys.client.shared.model.River; +import de.intevation.flys.client.client.services.RiverService; + + +/** + * This interface provides a method to list the supported rivers of the artifact + * server. + * + * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> + */ +public class RiverServiceImpl +extends RemoteServiceServlet +implements RiverService +{ + /** The XPath string that points to the rivers in the resulting document.*/ + public static final String XPATH_RIVERS = "/art:rivers/art:river"; + + + public River[] list(String serverUrl) { + Document doc = XMLUtils.newDocument(); + + XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( + doc, + ArtifactNamespaceContext.NAMESPACE_URI, + ArtifactNamespaceContext.NAMESPACE_PREFIX); + + doc.appendChild(ec.create("action")); + + HttpClient client = new HttpClientImpl(serverUrl); + + try { + Document res = client.callService(serverUrl, "rivers", doc); + + NodeList rivers = (NodeList) XMLUtils.xpath( + res, + XPATH_RIVERS, + XPathConstants.NODESET, + ArtifactNamespaceContext.INSTANCE); + + int count = rivers.getLength(); + + List<River> theRivers = new ArrayList<River>(count); + + for (int i = 0; i < count; i++) { + Node tmp = rivers.item(i); + + String name = XMLUtils.xpathString( + tmp, "@art:name", ArtifactNamespaceContext.INSTANCE); + + theRivers.add(new DefaultRiver(name)); + } + + return (River[]) theRivers.toArray(new River[count]); + } + catch (ConnectionException ce) { + System.err.println(ce.getLocalizedMessage()); + } + + return null; + } +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :