bjoern@3713: package de.intevation.flys.client.server;
bjoern@3713: 
bjoern@3713: import java.util.ArrayList;
bjoern@3713: import javax.xml.xpath.XPathConstants;
bjoern@3713: 
bjoern@3713: import org.apache.log4j.Logger;
bjoern@3713: 
bjoern@3713: import org.w3c.dom.Document;
bjoern@3713: import org.w3c.dom.Element;
bjoern@3713: import org.w3c.dom.NodeList;
bjoern@3713: 
bjoern@3713: import de.intevation.artifacts.common.ArtifactNamespaceContext;
bjoern@3713: import de.intevation.artifacts.common.utils.XMLUtils;
bjoern@3713: import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
bjoern@3713: import de.intevation.artifacts.httpclient.http.HttpClient;
bjoern@3713: import de.intevation.artifacts.httpclient.http.HttpClientImpl;
bjoern@3713: 
bjoern@3713: import de.intevation.flys.client.client.services.GaugeOverviewInfoService;
bjoern@3713: import de.intevation.flys.client.shared.exceptions.ServerException;
bjoern@3713: import de.intevation.flys.client.shared.model.DefaultGaugeInfo;
bjoern@3713: import de.intevation.flys.client.shared.model.DefaultRiverInfo;
bjoern@3713: import de.intevation.flys.client.shared.model.GaugeInfo;
bjoern@3713: import de.intevation.flys.client.shared.model.RiverInfo;
bjoern@3713: 
bjoern@3713: /**
bjoern@3713:  * @author <a href="mailto:bjoern.ricks@intevation.de">Björn Ricks</a>
bjoern@3713:  */
bjoern@3713: public class GaugeOverviewInfoServiceImpl
bjoern@3713: extends      RemoteServiceServlet
bjoern@3713: implements   GaugeOverviewInfoService
bjoern@3713: {
bjoern@3713:     private static final Logger logger =
bjoern@3713:         Logger.getLogger(GaugeOverviewInfoServiceImpl.class);
bjoern@3713: 
bjoern@3713:     public static final String ERROR_NO_RIVERINFO_FOUND =
bjoern@3713:         "error_no_gaugeoverviewinfo_found";
bjoern@3713: 
bjoern@3713:     private static final String XPATH_RIVER = "/art:gauge-info/art:river";
bjoern@3713: 
bjoern@3713:     private static final String XPATH_GAUGES = "/art:gauge-info/art:gauges/art:gauge";
bjoern@3713: 
bjoern@3713:     public RiverInfo getRiverInfo(String river) throws ServerException {
bjoern@3713:         logger.info("RiverInfoServiceImpl.getRiverInfo");
bjoern@3713: 
bjoern@3713:         String url = getServletContext().getInitParameter("server-url");
bjoern@3713: 
bjoern@3713:         Document doc = XMLUtils.newDocument();
bjoern@3713: 
bjoern@3713:         XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
bjoern@3713:             doc,
bjoern@3713:             ArtifactNamespaceContext.NAMESPACE_URI,
bjoern@3713:             ArtifactNamespaceContext.NAMESPACE_PREFIX);
bjoern@3713: 
bjoern@3713:         Element riverele = ec.create("river");
bjoern@3713:         riverele.setTextContent(river);
bjoern@3713: 
bjoern@3713:         doc.appendChild(riverele);
bjoern@3713: 
bjoern@3713:         HttpClient client = new HttpClientImpl(url);
bjoern@3713: 
bjoern@3713:         try {
bjoern@3713:             Document result = client.callService(url, "gaugeoverviewinfo", doc);
bjoern@3713: 
bjoern@3713:             Element riverresp = (Element) XMLUtils.xpath(
bjoern@3713:                     result,
bjoern@3713:                     XPATH_RIVER,
bjoern@3713:                     XPathConstants.NODE,
bjoern@3713:                     ArtifactNamespaceContext.INSTANCE);
bjoern@3713: 
bjoern@3713:             String rname = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "name");
bjoern@3713:             String rkmup = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "kmup");
bjoern@3713:             String rstart = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "start");
bjoern@3713:             String rend = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "end");
bjoern@3713:             String rwstunit = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "wstunit");
bjoern@3713:             String rminq = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "minq");
bjoern@3713:             String rmaxq = riverresp.getAttributeNS(
bjoern@3713:                     ArtifactNamespaceContext.NAMESPACE_URI, "maxq");
bjoern@3713: 
bjoern@3713:             logger.debug("River is " + rname);
bjoern@3713: 
bjoern@3713:             boolean kmup = rkmup.equalsIgnoreCase("true");
bjoern@3713: 
bjoern@3713:             NodeList gaugenodes = (NodeList) XMLUtils.xpath(
bjoern@3713:                 result,
bjoern@3713:                 XPATH_GAUGES,
bjoern@3713:                 XPathConstants.NODESET,
bjoern@3713:                 ArtifactNamespaceContext.INSTANCE);
bjoern@3713: 
bjoern@3713:             int num = gaugenodes == null ? 0 : gaugenodes.getLength();
bjoern@3713: 
bjoern@3713:             ArrayList<GaugeInfo> gauges = new ArrayList<GaugeInfo>(num);
bjoern@3713: 
bjoern@3713:             if (num == 0) {
bjoern@3713:                 logger.warn("No gauge info found.");
bjoern@3713:             }
bjoern@3713:             else {
bjoern@3713:                 logger.debug("Found " + num + " gauges.");
bjoern@3713: 
bjoern@3713:                 for (int i = 0; i < num; i++) {
bjoern@3713:                     Element gaugeele = (Element)gaugenodes.item(i);
bjoern@3713: 
bjoern@3713:                     String gname = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "name");
bjoern@3713:                     String gstart = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "start");
bjoern@3713:                     String gend = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "end");
bjoern@3713:                     String gdatum = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "datum");
bjoern@3713:                     String gaeo = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "aeo");
bjoern@3713:                     String gminq = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "minq");
bjoern@3713:                     String gminw = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "minw");
bjoern@3713:                     String gmaxq = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "maxq");
bjoern@3713:                     String gmaxw = gaugeele.getAttributeNS(
bjoern@3713:                             ArtifactNamespaceContext.NAMESPACE_URI, "maxw");
bjoern@3713: 
bjoern@3713:                     logger.debug("Found gauge with name " + gname);
bjoern@3713: 
bjoern@3713:                     GaugeInfo gaugeinfo = new DefaultGaugeInfo(
bjoern@3713:                             gname,
bjoern@3713:                             kmup,
bjoern@3713:                             parseDouble(gstart),
bjoern@3713:                             parseDouble(gend),
bjoern@3713:                             parseDouble(gdatum),
bjoern@3713:                             parseDouble(gaeo),
bjoern@3713:                             parseDouble(gminq),
bjoern@3713:                             parseDouble(gmaxq),
bjoern@3713:                             parseDouble(gminw),
bjoern@3713:                             parseDouble(gmaxw)
bjoern@3713:                             );
bjoern@3713: 
bjoern@3713:                     gauges.add(gaugeinfo);
bjoern@3713:                 }
bjoern@3713:             }
bjoern@3713: 
bjoern@3713:             RiverInfo riverinfo = new DefaultRiverInfo(
bjoern@3713:                     rname,
bjoern@3713:                     kmup,
bjoern@3713:                     parseDouble(rstart),
bjoern@3713:                     parseDouble(rend),
bjoern@3713:                     rwstunit,
bjoern@3713:                     parseDouble(rminq),
bjoern@3713:                     parseDouble(rmaxq),
bjoern@3713:                     gauges);
bjoern@3713: 
bjoern@3713:             logger.debug("Finished RiverInfoService.");
bjoern@3713: 
bjoern@3713:             return riverinfo;
bjoern@3713:         }
bjoern@3713:         catch (ConnectionException ce) {
bjoern@3713:             logger.error(ce, ce);
bjoern@3713:         }
bjoern@3713: 
bjoern@3713:         logger.warn("No gauge found");
bjoern@3713:         throw new ServerException(ERROR_NO_RIVERINFO_FOUND);
bjoern@3713:     }
bjoern@3713: 
bjoern@3713:     /**
bjoern@3713:      * Avoids NullPointerException when parsing double value
bjoern@3713:      */
bjoern@3713:     private Double parseDouble(String value) {
bjoern@3713:         if (value == null || value.isEmpty()) {
bjoern@3713:             return null;
bjoern@3713:         }
bjoern@3713:         try {
bjoern@3713:             return Double.valueOf(value);
bjoern@3713:         }
bjoern@3713:         catch(NumberFormatException e) {
bjoern@3713:             logger.error(e, e);
bjoern@3713:             return null;
bjoern@3713:         }
bjoern@3713:     }
bjoern@3713: }