ingo@1058: package de.intevation.flys.artifacts.services;
ingo@1058: 
ingo@1058: import org.apache.log4j.Logger;
ingo@1058: 
sascha@2098: import java.util.Map;
sascha@2098: import java.util.HashMap;
sascha@2098: 
ingo@1058: import org.w3c.dom.Document;
sascha@2098: import org.w3c.dom.Node;
ingo@1058: import org.w3c.dom.Element;
ingo@1058: 
sascha@2098: import javax.xml.xpath.XPathConstants;
sascha@2098: 
ingo@1774: import com.vividsolutions.jts.geom.Envelope;
ingo@1058: 
ingo@1058: import de.intevation.artifacts.CallMeta;
ingo@1058: import de.intevation.artifacts.GlobalContext;
ingo@1058: 
ingo@1058: import de.intevation.artifacts.common.ArtifactNamespaceContext;
ingo@1058: import de.intevation.artifacts.common.utils.Config;
ingo@1058: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@1058: import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
ingo@1058: 
sascha@2607: import de.intevation.artifactdatabase.XMLService;
ingo@1058: 
ingo@1058: import de.intevation.flys.utils.GeometryUtils;
ingo@1058: 
ingo@1058: /**
ingo@1058:  * This service provides information about the supported rivers by this
ingo@1058:  * application.
ingo@1058:  *
ingo@1058:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@1058:  */
sascha@2607: public class MapInfoService extends XMLService {
ingo@1058: 
ingo@1058:     /** XPath that points to the river.*/
ingo@1058:     public static final String XPATH_RIVER = "/mapinfo/river/text()";
ingo@1058: 
ingo@1058:     public static final String XPATH_RIVER_PROJECTION =
sascha@2098:         "/artifact-database/floodmap/river[@name=$river]/srid/@value";
ingo@1058: 
ingo@1058:     public static final String XPATH_RIVER_BACKGROUND =
sascha@3264:         "/artifact-database/floodmap/river[@name=$river]/background-wms";
ingo@1058: 
ingo@1058:     public static final String XPATH_RIVER_WMS =
sascha@2098:         "/artifact-database/floodmap/river[@name=$river]/river-wms/@url";
ingo@1058: 
ingo@1058: 
ingo@1058:     /** The logger used in this service.*/
ingo@1058:     private static Logger logger = Logger.getLogger(MapInfoService.class);
ingo@1058: 
ingo@1058: 
ingo@1058:     /**
ingo@1058:      * The default constructor.
ingo@1058:      */
ingo@1058:     public MapInfoService() {
ingo@1058:     }
ingo@1058: 
sascha@2098:     protected static String getStringXPath(
sascha@3076:         String              query,
sascha@2098:         Map<String, String> variables
sascha@2098:     ) {
sascha@2098:         return (String)XMLUtils.xpath(
sascha@2098:             Config.getConfig(), query, XPathConstants.STRING,
sascha@2098:             null, variables);
sascha@2098:     }
sascha@2098: 
sascha@2098:     protected static Node getNodeXPath(
sascha@3076:         String              query,
sascha@2098:         Map<String, String> variables
sascha@2098:     ) {
sascha@2098:         return (Node)XMLUtils.xpath(
sascha@2098:             Config.getConfig(), query, XPathConstants.NODE,
sascha@2098:             null, variables);
sascha@2098:     }
ingo@1058: 
sascha@2607:     @Override
sascha@2607:     public Document processXML(
ingo@1058:         Document      data,
ingo@1058:         GlobalContext globalContext,
ingo@1058:         CallMeta      callMeta
ingo@1058:     ) {
ingo@1058:         logger.debug("MapInfoService.process");
ingo@1058: 
ingo@1058:         Document result   = XMLUtils.newDocument();
ingo@1058:         ElementCreator cr = new ElementCreator(result, null, null);
ingo@1058: 
ingo@1058:         Element mapinfo = cr.create("mapinfo");
ingo@1058:         result.appendChild(mapinfo);
ingo@1058: 
ingo@1058:         String river = extractRiver(data);
ingo@1058:         if (river == null || river.length() == 0) {
ingo@1058:             logger.warn("Cannot generate information: river is empty!");
ingo@1058:             return result;
ingo@1058:         }
ingo@1058: 
ingo@1058:         Element root = cr.create("river");
ingo@1058:         cr.addAttr(root, "name", river);
ingo@1058:         mapinfo.appendChild(root);
ingo@1058: 
ingo@2078:         Envelope env = GeometryUtils.getRiverBoundary(river);
ingo@2078:         if (env != null) {
ingo@2078:             String bounds = GeometryUtils.jtsBoundsToOLBounds(env);
ingo@2078:             logger.debug("River '" + river + "' bounds: " + bounds);
ingo@1058: 
ingo@1058:             Element bbox = cr.create("bbox");
ingo@1058:             cr.addAttr(bbox, "value", bounds);
ingo@1058:             root.appendChild(bbox);
ingo@1058:         }
ingo@1058: 
sascha@2098:         Map<String, String> vars = new HashMap<String, String>();
sascha@2098:         vars.put("river", river);
sascha@2098: 
sascha@2098:         String sridStr = getStringXPath(XPATH_RIVER_PROJECTION, vars);
sascha@2098: 
ingo@1058:         if (sridStr != null && sridStr.length() > 0) {
ingo@1058:             Element srid = cr.create("srid");
ingo@1058:             cr.addAttr(srid, "value", sridStr);
ingo@1058:             root.appendChild(srid);
ingo@1058:         }
ingo@1058: 
sascha@2098:         Element back = (Element)getNodeXPath(XPATH_RIVER_BACKGROUND, vars);
ingo@1058:         if (back != null) {
ingo@1058:             Element background = cr.create("background-wms");
ingo@1058:             cr.addAttr(background, "url", back.getAttribute("url"));
ingo@1058:             cr.addAttr(background, "layers", back.getAttribute("layers"));
ingo@1058:             root.appendChild(background);
ingo@1058:         }
ingo@1058: 
sascha@2098:         String wmsStr = getStringXPath(XPATH_RIVER_WMS, vars);
ingo@1058:         if (wmsStr != null && wmsStr.length() > 0) {
ingo@1058:             Element wms = cr.create("river-wms");
ingo@1058:             cr.addAttr(wms, "url", wmsStr);
ingo@1058:             root.appendChild(wms);
ingo@1058:         }
ingo@1058: 
ingo@1058:         return result;
ingo@1058:     }
ingo@1058: 
ingo@1058: 
ingo@1058:     protected String extractRiver(Document data) {
ingo@1058:         return XMLUtils.xpathString(
ingo@1058:             data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
ingo@1058:     }
ingo@1058: }
ingo@1058: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :