Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 802:4abe172be970

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Finished Javadoc of the raster package. gnv-artifacts/trunk@884 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 07 Apr 2010 07:49:12 +0000
parents d766fe2d917a
children bb7afd783321
rev   line source
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1 package de.intevation.gnv.math;
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2
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3 import com.vividsolutions.jts.geom.Coordinate;
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5 import de.intevation.gnv.geobackend.base.Result;
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7 import de.intevation.gnv.geobackend.base.query.QueryExecutor;
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8 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
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10 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
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12 import de.intevation.gnv.geobackend.sde.datasources.RasterObject;
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14 import de.intevation.gnv.utils.WKTUtils;
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16 import java.lang.ref.SoftReference;
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17
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18 import java.util.ArrayList;
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19 import java.util.Collection;
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20
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21 import org.apache.log4j.Logger;
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22
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23 /**
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24 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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25 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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26 */
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27 public class QueriedXYDepth implements XYDepth {
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28
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29 /**
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30 * the logger, used to log exceptions and additonaly information
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31 */
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32 private static Logger log = Logger.getLogger(QueriedXYDepth.class);
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34 private static final String queryID = "rasterQuery";
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35
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36 private QueryExecutor queryExecutor;
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37
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38 private ArrayList<SoftReference<RasterObject>> rasterData;
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39
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40 private RasterObject last;
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41
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42 private int interpolation;
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43
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44 public QueriedXYDepth() {
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45 this(RasterObject.BILINEAR);
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46 }
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47
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48 public QueriedXYDepth(int interpolation) {
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49 this.interpolation = interpolation;
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50 rasterData = new ArrayList<SoftReference<RasterObject>>();
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51 queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor();
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52 }
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53
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54 /**
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55 * @see de.intevation.gnv.math.XYDepth#depth(com.vividsolutions.jts.geom.Coordinate)
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56 */
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57 public double depth(Coordinate coordinate) {
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58 double resultValue = Double.NaN;
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59
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60 RasterObject ro = getRasterObject(coordinate);
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61
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62 if (ro == null) {
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63 try {
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64 String[] filterValues =
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65 new String[] { WKTUtils.toWKT(coordinate) };
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66 Collection<Result> result = queryExecutor.executeQuery(
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67 queryID, filterValues);
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68 for (Result row: result) {
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69 if ((ro = (RasterObject)row.getObject(0)) != null) {
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70 rasterData.add(
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71 new SoftReference<RasterObject>(last = ro));
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72 }
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73 break;
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74 }
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75 } catch (QueryException e) {
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76 log.error(e, e);
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77 }
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78 }
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79 return ro != null
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80 ? ro.getValue(coordinate, interpolation)
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81 : Double.NaN;
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82 }
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83
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84 private RasterObject getRasterObject(Coordinate coordinate) {
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85 if (last != null && last.contains(coordinate)) {
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86 return last;
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87 }
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88 for (int i = rasterData.size()-1; i >= 0; --i) {
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89 SoftReference<RasterObject> ref = rasterData.get(i);
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90 RasterObject ro = ref.get();
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91 if (ro != null && ro.contains(coordinate)) {
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92 return last = ro;
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93 }
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94 }
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95 return null;
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96 }
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97 }
http://dive4elements.wald.intevation.org