Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 1030:c07d9f9a738c

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Removed bugs that existed in the caching mechanism (issue264, issue268). gnv-artifacts/trunk@1067 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 06 May 2010 08:32:56 +0000
parents 05bf8534a35a
children f953c9a559d8
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 * This implementation uses the geo backend to query a depth via
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25 * a raster layer stored in the database.
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26 *
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27 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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28 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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29 */
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30 public class QueriedXYDepth
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31 implements XYDepth
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32 {
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33 private static Logger log = Logger.getLogger(QueriedXYDepth.class);
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34
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35 private static final String queryID = "rasterQuery";
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36
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37 private QueryExecutor queryExecutor;
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38
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39 private ArrayList<SoftReference<RasterObject>> rasterData;
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40
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41 private RasterObject last;
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42
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43 private int interpolation;
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44
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45 /**
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46 * Default construtor. Interpolation method is bilinear.
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47 */
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48 public QueriedXYDepth() {
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49 this(RasterObject.BILINEAR);
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50 }
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51
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52 /**
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53 * Constructor to create a QueriedXYDepth with a given interpolation
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54 * method.
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55 * @param interpolation The interpolation method.
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56 */
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57 public QueriedXYDepth(int interpolation) {
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58 this.interpolation = interpolation;
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59 rasterData = new ArrayList<SoftReference<RasterObject>>();
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60 queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor();
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61 }
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62
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63 public double depth(Coordinate coordinate) {
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64 double resultValue = Double.NaN;
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65
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66 RasterObject ro = getRasterObject(coordinate);
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67
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68 if (ro == null) {
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69 try {
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70 String[] filterValues =
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71 new String[] { WKTUtils.toWKT(coordinate) };
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72 Collection<Result> result = queryExecutor.executeQuery(
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73 queryID, filterValues);
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74 for (Result row: result) {
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75 if ((ro = (RasterObject)row.getObject(0)) != null) {
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76 rasterData.add(
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77 new SoftReference<RasterObject>(last = ro));
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78 }
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79 break;
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80 }
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81 } catch (QueryException e) {
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82 log.error(e, e);
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83 }
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84 }
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85 return ro != null
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86 ? ro.getValue(coordinate, interpolation)
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87 : Double.NaN;
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88 }
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89
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90 private RasterObject getRasterObject(Coordinate coordinate) {
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91 if (last != null && last.contains(coordinate)) {
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92 return last;
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93 }
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94 for (int i = rasterData.size()-1; i >= 0; --i) {
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95 SoftReference<RasterObject> ref = rasterData.get(i);
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96 RasterObject ro = ref.get();
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97 if (ro != null && ro.contains(coordinate)) {
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98 return last = ro;
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99 }
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100 }
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101 return null;
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102 }
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103 }
http://dive4elements.wald.intevation.org