Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 733:18dc6a99f4f4

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Fixed NPE will using StateBase without a given Query. gnv-artifacts/trunk@771 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Mon, 15 Mar 2010 12:34:40 +0000
parents f7038820df2e
children 9a828e5a2390
rev   line source
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1 /**
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2 *
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3 */
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4 package de.intevation.gnv.math;
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5
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6 import java.util.ArrayList;
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7 import java.util.Collection;
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8
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9 import java.lang.ref.SoftReference;
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11 import org.apache.log4j.Logger;
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12
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13 import com.vividsolutions.jts.geom.Coordinate;
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14
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15 import de.intevation.gnv.geobackend.base.Result;
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16 import de.intevation.gnv.geobackend.base.query.QueryExecutor;
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17 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
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18 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
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19 import de.intevation.gnv.geobackend.sde.datasources.RasterObject;
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21 import de.intevation.gnv.utils.WKTUtils;
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22
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23 /**
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24 * @author Tim Englich (tim.englich@intevation.de)
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25 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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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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33
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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 = new String[] { WKTUtils.toWKT(coordinate) };
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65 Collection<Result> result = queryExecutor.executeQuery(this.queryID,filterValues);
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66 for (Result row: result) {
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67 if ((ro = (RasterObject)row.getObject(0)) != null) {
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68 rasterData.add(new SoftReference<RasterObject>(last = ro));
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69 }
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70 break;
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71 }
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72 } catch (QueryException e) {
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73 log.error(e, e);
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74 }
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75 }
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76 return ro != null
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77 ? ro.getValue(coordinate, interpolation)
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78 : Double.NaN;
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79 }
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80
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81 private RasterObject getRasterObject(Coordinate coordinate) {
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82 if (last != null && last.contains(coordinate)) {
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83 return last;
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84 }
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85 for (int i = rasterData.size()-1; i >= 0; --i) {
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86 SoftReference<RasterObject> ref = rasterData.get(i);
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87 RasterObject ro = ref.get();
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88 if (ro != null && ro.contains(coordinate)) {
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89 return last = ro;
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90 }
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91 }
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92 return null;
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93 }
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94 }
http://dive4elements.wald.intevation.org