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annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 605:e8ebdbc7f1e3

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First step of removing the cache blob. The static part of the describe document will be created by using the input data stored at each state. Some TODOs left (see ChangeLog). gnv-artifacts/trunk@671 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 09 Feb 2010 14:27:55 +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 }
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