felix@1426: package de.intevation.flys.client.server;
felix@1426:
felix@1426: import java.util.ArrayList;
felix@1426: import java.util.HashMap;
felix@1426: import java.util.Map;
felix@1426:
felix@1426: import javax.xml.xpath.XPathConstants;
felix@1426:
felix@1426: import org.w3c.dom.Document;
felix@1426: import org.w3c.dom.Element;
felix@1426: import org.w3c.dom.NodeList;
felix@1426:
felix@1426: import org.apache.log4j.Logger;
felix@1426:
felix@1426: import com.google.gwt.user.server.rpc.RemoteServiceServlet;
felix@1426:
felix@1426: import de.intevation.artifacts.common.ArtifactNamespaceContext;
felix@1426: import de.intevation.artifacts.common.utils.XMLUtils;
felix@1426:
felix@1426: import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
felix@1426: import de.intevation.artifacts.httpclient.http.HttpClient;
felix@1426: import de.intevation.artifacts.httpclient.http.HttpClientImpl;
felix@1426:
felix@1426: import de.intevation.flys.client.shared.exceptions.ServerException;
felix@1426: import de.intevation.flys.client.client.services.CrossSectionKMService;
felix@1426:
felix@1426: /**
felix@1426: * Interact with not documented service.
felix@1426: */
felix@1426: public class CrossSectionKMServiceImpl
felix@1426: extends RemoteServiceServlet
felix@1426: implements CrossSectionKMService
felix@1426: {
felix@1426: private static final Logger logger =
felix@1426: Logger.getLogger(CrossSectionKMServiceImpl.class);
felix@1426:
felix@1426: /** XPath that points to the found cross section measurements. */
felix@1426: public static final String XPATH_CROSS_SECTIONS
felix@1426: = "/cross-sections/cross-section";
felix@1426:
felix@1426: /** The error message key that is thrown if an error occured while getting
felix@1426: * new data. */
felix@1426: public static final String ERROR_GET_CROSS_SECTION
felix@1426: = "error_get_cross_section";
felix@1426:
felix@1426:
felix@1426: /**
felix@1426: * Fetches positions (kms) at which measurements for given cross-sections
felix@1426: * exists.
felix@1426: *
felix@1426: * @param data Map of Integer (cross-section-id) to km.
felix@1426: *
felix@1426: */
felix@1426: public Map<Integer,Double[]> getCrossSectionKMs(
felix@1426: String locale,
felix@1426: Map<Integer, Double> data,
felix@1426: int nNeighbours)
felix@1426: throws ServerException
felix@1426: {
felix@1426: logger.info("CrossSectionKMService.getCrossSectionKMs");
felix@1426:
felix@1426: String url = getServletContext().getInitParameter("server-url");
felix@1426:
felix@1426: Document doc = XMLUtils.newDocument();
felix@1426:
felix@1426: XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
felix@1426: doc,
felix@1426: ArtifactNamespaceContext.NAMESPACE_URI,
felix@1426: ArtifactNamespaceContext.NAMESPACE_PREFIX);
felix@1426: Element crossSection = ec.create("cross-sections");
felix@1426:
felix@1426: doc.appendChild(crossSection);
felix@1426:
felix@1426: for(Map.Entry<Integer, Double> oneCrossSection : data.entrySet()) {
felix@1426: Element cs = ec.create("cross-section");
felix@1426: cs.setAttribute("id", oneCrossSection.getKey().toString());
felix@1426: cs.setAttribute("km", oneCrossSection.getValue().toString());
felix@1426: cs.setAttribute("n", Integer.valueOf(nNeighbours).toString());
felix@1426: crossSection.appendChild(cs);
felix@1426: }
felix@1426:
felix@1426: HttpClient client = new HttpClientImpl(url, locale);
felix@1426: logger.debug("Created httpclient");
felix@1426:
felix@1426: try {
felix@1426: // Document should contain:
felix@1426: // crosse-sections:
felix@1426: // attribute(id), attribute(km) attribute(n)
felix@1426: Document response = client.callService(url, "cross-section-km", doc);
felix@1426: //<cross-sections><cross-section id="1"><line km="19.5" line-id="189"/>...
felix@1426:
felix@1426: NodeList nodeList = (NodeList) XMLUtils.xpath(response,
felix@1426: XPATH_CROSS_SECTIONS,
felix@1426: XPathConstants.NODESET);
felix@1426:
felix@1426: int num = nodeList.getLength();
felix@1426:
felix@1426: Map<Integer, Double[]> result = new HashMap<Integer, Double[]>();
felix@1426:
felix@1426: try{
felix@1426: for (int i = 0; i < num; i++) {
felix@1426: Element csElement = (Element) nodeList.item(i);
felix@1426:
felix@1426: int idx = Integer.parseInt(csElement.getAttribute("id"));
felix@1426: ArrayList<Double> kms = new ArrayList<Double>();
felix@1426:
felix@1426: NodeList lineNodes = csElement.getElementsByTagName("line");
felix@1426: int numLines = lineNodes.getLength();
felix@1426: for (int k = 0; k < numLines; k++) {
felix@1434: Element line = (Element) lineNodes.item(k);
felix@1426: double d = Double.parseDouble(line.getAttribute("km"));
felix@1426: kms.add(d);
felix@1426: }
felix@1426:
felix@1426: Double[] doubles = new Double[kms.size()];
felix@1426: kms.toArray(doubles);
felix@1426: result.put(Integer.valueOf(idx), doubles);
felix@1426: }
felix@1426: }
felix@1426: catch(NumberFormatException nfe) {
felix@1426: logger.error("Response was not parsable");
felix@1426: }
felix@1426:
felix@1426: return result;
felix@1426: }
felix@1426: catch (ConnectionException ce) {
felix@1426: logger.error("ConnectionExsp", ce);
felix@1426: }
felix@1426:
felix@1426: logger.warn("CrossSectionKMService.getCrossSectionKMS() - FAILED");
felix@1426: throw new ServerException(ERROR_GET_CROSS_SECTION);
felix@1426: }
felix@1426: }
felix@1426: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :