Mercurial > dive4elements > gnv-client
view gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 457:47ad9721e692
Added RasterObject for caching the Rastertiles to get a better performance.
gnv-artifacts/trunk@509 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Tue, 05 Jan 2010 14:12:03 +0000 |
parents | 363236fc462d |
children | 92d6cf448598 |
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/** * */ package de.intevation.gnv.math; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import org.apache.log4j.Logger; import com.vividsolutions.jts.geom.Coordinate; import de.intevation.gnv.geobackend.base.Result; import de.intevation.gnv.geobackend.base.query.QueryExecutor; import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory; import de.intevation.gnv.geobackend.base.query.exception.QueryException; import de.intevation.gnv.geobackend.sde.datasources.RasterObject; /** * @author Tim Englich <tim.englich@intevation.de> * */ public class QueriedXYDepth implements XYDepth { /** * the logger, used to log exceptions and additonaly information */ private static Logger log = Logger.getLogger(QueriedXYDepth.class); private String queryID = "rasterQuery"; private QueryExecutor queryExecutor = null; private ArrayList<RasterObject> rasterData = new ArrayList<RasterObject>(); /** * Constructor */ public QueriedXYDepth() { this.queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor(); } /** * @see de.intevation.gnv.math.XYDepth#depth(com.vividsolutions.jts.geom.Coordinate) */ public double depth(Coordinate coordinate) { log.debug("QueriedXYDepth.depth for " + coordinate.x+" "+ coordinate.y); double resultValue = Double.NaN; RasterObject ro = this.getRasterObject(coordinate); if (ro == null){ Collection<Result> result = null; try { String[] filterValues = new String[]{"Point ("+coordinate.x+" "+coordinate.y+")"}; result = this.queryExecutor.executeQuery(this.queryID,filterValues); } catch (QueryException e) { log.error(e,e); } if (result != null){ if (!result.isEmpty()){ Result row = result.iterator().next(); ro = (RasterObject)row.getObject(0); synchronized (rasterData) { rasterData.add(ro); } } } } if (ro != null){ resultValue = ro.getValue(coordinate); } return resultValue; } private RasterObject getRasterObject(Coordinate coordinate){ for (int i = 0; i < rasterData.size(); i++){ RasterObject ro = rasterData.get(i); if (ro.getEnvelope().contains(coordinate)){ return ro; } } return null; } }