Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 875:5e9efdda6894
merged gnv-artifacts/1.0
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:56 +0200 |
| parents | 05bf8534a35a |
| children | f953c9a559d8 |
comparison
equal
deleted
inserted
replaced
| 722:bb3ffe7d719e | 875:5e9efdda6894 |
|---|---|
| 1 package de.intevation.gnv.math; | |
| 2 | |
| 3 import com.vividsolutions.jts.geom.Coordinate; | |
| 4 | |
| 5 import de.intevation.gnv.geobackend.base.Result; | |
| 6 | |
| 7 import de.intevation.gnv.geobackend.base.query.QueryExecutor; | |
| 8 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory; | |
| 9 | |
| 10 import de.intevation.gnv.geobackend.base.query.exception.QueryException; | |
| 11 | |
| 12 import de.intevation.gnv.geobackend.sde.datasources.RasterObject; | |
| 13 | |
| 14 import de.intevation.gnv.utils.WKTUtils; | |
| 15 | |
| 16 import java.lang.ref.SoftReference; | |
| 17 | |
| 18 import java.util.ArrayList; | |
| 19 import java.util.Collection; | |
| 20 | |
| 21 import org.apache.log4j.Logger; | |
| 22 | |
| 23 /** | |
| 24 * This implementation uses the geo backend to query a depth via | |
| 25 * a raster layer stored in the database. | |
| 26 * | |
| 27 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a> | |
| 28 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 29 */ | |
| 30 public class QueriedXYDepth | |
| 31 implements XYDepth | |
| 32 { | |
| 33 private static Logger log = Logger.getLogger(QueriedXYDepth.class); | |
| 34 | |
| 35 private static final String queryID = "rasterQuery"; | |
| 36 | |
| 37 private QueryExecutor queryExecutor; | |
| 38 | |
| 39 private ArrayList<SoftReference<RasterObject>> rasterData; | |
| 40 | |
| 41 private RasterObject last; | |
| 42 | |
| 43 private int interpolation; | |
| 44 | |
| 45 /** | |
| 46 * Default construtor. Interpolation method is bilinear. | |
| 47 */ | |
| 48 public QueriedXYDepth() { | |
| 49 this(RasterObject.BILINEAR); | |
| 50 } | |
| 51 | |
| 52 /** | |
| 53 * Constructor to create a QueriedXYDepth with a given interpolation | |
| 54 * method. | |
| 55 * @param interpolation The interpolation method. | |
| 56 */ | |
| 57 public QueriedXYDepth(int interpolation) { | |
| 58 this.interpolation = interpolation; | |
| 59 rasterData = new ArrayList<SoftReference<RasterObject>>(); | |
| 60 queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor(); | |
| 61 } | |
| 62 | |
| 63 public double depth(Coordinate coordinate) { | |
| 64 double resultValue = Double.NaN; | |
| 65 | |
| 66 RasterObject ro = getRasterObject(coordinate); | |
| 67 | |
| 68 if (ro == null) { | |
| 69 try { | |
| 70 String[] filterValues = | |
| 71 new String[] { WKTUtils.toWKT(coordinate) }; | |
| 72 Collection<Result> result = queryExecutor.executeQuery( | |
| 73 queryID, filterValues); | |
| 74 for (Result row: result) { | |
| 75 if ((ro = (RasterObject)row.getObject(0)) != null) { | |
| 76 rasterData.add( | |
| 77 new SoftReference<RasterObject>(last = ro)); | |
| 78 } | |
| 79 break; | |
| 80 } | |
| 81 } catch (QueryException e) { | |
| 82 log.error(e, e); | |
| 83 } | |
| 84 } | |
| 85 return ro != null | |
| 86 ? ro.getValue(coordinate, interpolation) | |
| 87 : Double.NaN; | |
| 88 } | |
| 89 | |
| 90 private RasterObject getRasterObject(Coordinate coordinate) { | |
| 91 if (last != null && last.contains(coordinate)) { | |
| 92 return last; | |
| 93 } | |
| 94 for (int i = rasterData.size()-1; i >= 0; --i) { | |
| 95 SoftReference<RasterObject> ref = rasterData.get(i); | |
| 96 RasterObject ro = ref.get(); | |
| 97 if (ro != null && ro.contains(coordinate)) { | |
| 98 return last = ro; | |
| 99 } | |
| 100 } | |
| 101 return null; | |
| 102 } | |
| 103 } |