Mercurial > dive4elements > river
diff flys-client/src/main/java/org/dive4elements/river/client/server/WQInfoServiceImpl.java @ 5834:f507086aa94b
Repaired internal references.
author | Sascha L. Teichmann <teichmann@intevation.de> |
---|---|
date | Thu, 25 Apr 2013 12:31:32 +0200 |
parents | flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java@8fce35702908 |
children | 821a02bbfb4e |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/flys-client/src/main/java/org/dive4elements/river/client/server/WQInfoServiceImpl.java Thu Apr 25 12:31:32 2013 +0200 @@ -0,0 +1,207 @@ +package de.intevation.flys.client.server; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Comparator; +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.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); + } + + boolean debug = logger.isDebugEnabled(); + + int num = list.getLength(); + if (debug) { + 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); + } + } + + if (debug) { + logger.debug("Retrieved " + objects.size() + " wq values"); + } + + WQInfoObject [] array = (WQInfoObject[]) + objects.toArray(new WQInfoObject[objects.size()]); + + Arrays.sort(array, WQ_INFO_OBJECT_CMP); + + return array; + } + + public static final Comparator<WQInfoObject> WQ_INFO_OBJECT_CMP = + new Comparator<WQInfoObject>() { + @Override + public int compare(WQInfoObject a, WQInfoObject b) { + + // Descending by type: Qs before Ds + int cmp = a.getType().compareTo(b.getType()); + if (cmp < 0) return +1; + if (cmp > 0) return -1; + + // Ascending by value + double diff = a.getValue() - b.getValue(); + if (diff < 0d) return -1; + if (diff > 0d) return +1; + return 0; + } + }; + + /** + * 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 static 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 :