Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 462:912797826099

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Use new raster access. gnv-artifacts/trunk@519 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 09 Jan 2010 12:45:42 +0000
parents 92d6cf448598
children 07672838fa5f
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 import java.util.HashMap;
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9
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10 import java.lang.ref.SoftReference;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import com.vividsolutions.jts.geom.Coordinate;
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15
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16 import de.intevation.gnv.geobackend.base.Result;
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17 import de.intevation.gnv.geobackend.base.query.QueryExecutor;
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18 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
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19 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
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20 import de.intevation.gnv.geobackend.sde.datasources.RasterObject;
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21
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22 import de.intevation.gnv.utils.WKTUtils;
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23
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24 /**
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25 * @author Tim Englich (tim.englich@intevation.de)
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26 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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27 */
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28 public class QueriedXYDepth implements XYDepth {
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29
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30 /**
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31 * the logger, used to log exceptions and additonaly information
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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 /**
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44 * Constructor
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45 */
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46 public QueriedXYDepth() {
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47 rasterData = new ArrayList<SoftReference<RasterObject>>();
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48 queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor();
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49 }
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50
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51 /**
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52 * @see de.intevation.gnv.math.XYDepth#depth(com.vividsolutions.jts.geom.Coordinate)
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53 */
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54 public double depth(Coordinate coordinate) {
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55 double resultValue = Double.NaN;
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56
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57 RasterObject ro = getRasterObject(coordinate);
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58
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59 if (ro == null) {
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60 try {
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61 String[] filterValues = new String[] { WKTUtils.toWKT(coordinate) };
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62 Collection<Result> result = queryExecutor.executeQuery(this.queryID,filterValues);
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63 for (Result row: result) {
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64 if ((ro = (RasterObject)row.getObject(0)) != null) {
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65 rasterData.add(new SoftReference<RasterObject>(last = ro));
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66 }
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67 break;
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68 }
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69 } catch (QueryException e) {
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70 log.error(e, e);
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71 }
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72 }
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73 return ro != null
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74 ? ro.getValue(coordinate)
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75 : Double.NaN;
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76 }
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77
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78 private RasterObject getRasterObject(Coordinate coordinate){
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79 if (last != null && last.contains(coordinate)) {
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80 return last;
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81 }
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82 for (int i = rasterData.size()-1; i >= 0; --i) {
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83 SoftReference<RasterObject> ref = rasterData.get(i);
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84 RasterObject ro = ref.get();
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85 if (ro != null && ro.contains(coordinate)) {
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86 return last = ro;
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87 }
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88 }
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89 return null;
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90 }
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91 }
http://dive4elements.wald.intevation.org