Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/WQInfoServiceImpl.java @ 5818:a4ff4167be1e
Request feature info on all layers and show it as html if
the server does not return valid gml.
Non queryable layers produce an error message when the request
fails. This is good enough
author | Andre Heinecke <aheinecke@intevation.de> |
---|---|
date | Wed, 24 Apr 2013 17:33:27 +0200 |
parents | 8fce35702908 |
children |
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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 :