Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 2508:4aa70825bde1
map print: generate valid url to access service.
flys-client/trunk@4363 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
---|---|
date | Wed, 09 May 2012 11:18:24 +0000 |
parents | bc06a671ef60 |
children | e70ff0a600a3 |
line wrap: on
line source
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.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.apache.log4j.Logger; 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.exceptions.ServerException; import de.intevation.flys.client.client.services.WQInfoService; import de.intevation.flys.client.shared.model.WQInfoObject; import de.intevation.flys.client.shared.model.WQInfoObjectImpl; /** * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class WQInfoServiceImpl extends RemoteServiceServlet implements WQInfoService { private static final Logger logger = Logger.getLogger(WQInfoServiceImpl.class); public static final String ERROR_NO_WQINFO_FOUND = "error_no_wqinfo_found"; public static final String XPATH_WQS = "art:service/art:mainvalues/art:mainvalue"; public WQInfoObject[] getWQInfo( String locale, String river, double from, double to) throws ServerException { logger.info("WQInfoServiceImpl.getWQInfo"); String url = getServletContext().getInitParameter("server-url"); Document doc = XMLUtils.newDocument(); XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( doc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element mainvalues = ec.create("mainvalues"); Element riverEl = ec.create("river"); Element startEl = ec.create("start"); Element endEl = ec.create("end"); riverEl.setTextContent(river); startEl.setTextContent(Double.valueOf(from).toString()); endEl.setTextContent(Double.valueOf(to).toString()); mainvalues.appendChild(riverEl); mainvalues.appendChild(startEl); mainvalues.appendChild(endEl); doc.appendChild(mainvalues); HttpClient client = new HttpClientImpl(url, locale); try { Document result = client.callService(url, "mainvalues", doc); logger.debug("Extract wq info objects now."); WQInfoObject[] objects = extractWQInfoObjects(result); if (objects != null && objects.length > 0) { return objects; } } catch (ConnectionException ce) { logger.error(ce, ce); } throw new ServerException(ERROR_NO_WQINFO_FOUND); } /** * Extracts all wq info objects from <i>result</i> document. * * @param result The document retrieved by the server. * * @return a list of WQInfoObjects. */ protected WQInfoObject[] extractWQInfoObjects(Document result) throws ServerException { NodeList list = (NodeList) XMLUtils.xpath( result, XPATH_WQS, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); if (list == null || list.getLength() == 0) { logger.warn("No wq info found."); throw new ServerException(ERROR_NO_WQINFO_FOUND); } int num = list.getLength(); logger.debug("Response contains " + num + " objects."); List<WQInfoObject> objects = new ArrayList<WQInfoObject>(num); for (int i = 0; i < num; i++) { WQInfoObject obj = buildWQInfoObject(list.item(i)); if (obj != null) { objects.add(obj); } } logger.debug("Retrieved " + objects.size() + " wq values"); return (WQInfoObject[]) objects.toArray(new WQInfoObject[num]); } /** * Extracts information for a single wq info object and intializes an * WQInfoObject with them. * * @param node The node that contains the information. * * @return a valid WQInfoObject. */ protected WQInfoObject buildWQInfoObject(Node node) { String name = XMLUtils.xpathString( node, "@name", ArtifactNamespaceContext.INSTANCE); String type = XMLUtils.xpathString( node, "@type", ArtifactNamespaceContext.INSTANCE); String value = XMLUtils.xpathString( node, "@value", ArtifactNamespaceContext.INSTANCE); if (name != null && type != null) { try { return new WQInfoObjectImpl( name, type, new Double(value)); } catch (NumberFormatException nfe) { logger.warn(nfe.getLocalizedMessage()); } } logger.warn("Invalid wq info object found."); return null; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :