tim@455: /**
tim@455:  *
tim@455:  */
tim@455: package de.intevation.gnv.math;
tim@455: 
tim@457: import java.util.ArrayList;
tim@455: import java.util.Collection;
tim@457: import java.util.HashMap;
tim@455: 
sascha@458: import java.lang.ref.SoftReference;
sascha@458: 
tim@455: import org.apache.log4j.Logger;
tim@455: 
tim@455: import com.vividsolutions.jts.geom.Coordinate;
tim@455: 
tim@455: import de.intevation.gnv.geobackend.base.Result;
tim@455: import de.intevation.gnv.geobackend.base.query.QueryExecutor;
tim@455: import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
tim@455: import de.intevation.gnv.geobackend.base.query.exception.QueryException;
tim@457: import de.intevation.gnv.geobackend.sde.datasources.RasterObject;
tim@455: 
sascha@458: import de.intevation.gnv.utils.WKTUtils;
tim@455: 
tim@455: /**
sascha@458:  * @author Tim Englich         (tim.englich@intevation.de)
sascha@458:  * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
tim@455:  */
tim@455: public class QueriedXYDepth implements XYDepth {
tim@455: 
tim@455:     /**
tim@455:      * the logger, used to log exceptions and additonaly information
tim@455:      */
tim@455:     private static Logger log = Logger.getLogger(QueriedXYDepth.class);
tim@455:     
sascha@458:     private static final String queryID = "rasterQuery";
tim@455:     
sascha@458:     private QueryExecutor queryExecutor;
tim@455:     
sascha@458:     private ArrayList<SoftReference<RasterObject>> rasterData;
tim@457:     
tim@455:     /**
tim@455:      * Constructor
tim@455:      */
tim@455:     public QueriedXYDepth() {
sascha@458:         rasterData    = new ArrayList<SoftReference<RasterObject>>();
sascha@458:         queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor();
tim@455:     }
tim@455: 
tim@455:     /**
tim@455:      * @see de.intevation.gnv.math.XYDepth#depth(com.vividsolutions.jts.geom.Coordinate)
tim@455:      */
tim@455:     public double depth(Coordinate coordinate) {
tim@457:         double resultValue = Double.NaN;
tim@455:         
sascha@458:         RasterObject ro = getRasterObject(coordinate);
tim@457:         
sascha@458:         if (ro == null) {
tim@457:             try {
sascha@458:                 String[] filterValues = new String[] { WKTUtils.toWKT(coordinate) };
sascha@458:                 Collection<Result> result = queryExecutor.executeQuery(this.queryID,filterValues);
sascha@458:                 for (Result row: result) {
sascha@458:                     if ((ro = (RasterObject)row.getObject(0)) != null) {
sascha@458:                         rasterData.add(new SoftReference<RasterObject>(ro));
sascha@458:                     }
sascha@458:                     break;
sascha@458:                 }
tim@457:             } catch (QueryException e) {
sascha@458:                 log.error(e, e);
tim@457:             }
tim@457:         }
sascha@458:         return ro != null
sascha@458:             ? ro.getValue(coordinate)
sascha@458:             : Double.NaN; 
tim@455:     }
tim@457:     
tim@457:     private RasterObject getRasterObject(Coordinate coordinate){
sascha@458:         for (int i = rasterData.size()-1; i >= 0; --i) {
sascha@458:             SoftReference<RasterObject> ref = rasterData.get(i);
sascha@458:             RasterObject ro = ref.get();
sascha@458:             if (ro != null && ro.getEnvelope().contains(coordinate)) {
tim@457:                 return ro;
tim@457:             }
tim@457:         }
tim@457:         return null;
tim@457:     }
tim@455: }