Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 457:47ad9721e692
Added RasterObject for caching the Rastertiles to get a better performance.
gnv-artifacts/trunk@509 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Tue, 05 Jan 2010 14:12:03 +0000 |
parents | 363236fc462d |
children | 92d6cf448598 |
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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 |
457
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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 org.apache.log4j.Logger; |
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11 |
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12 import com.vividsolutions.jts.geom.Coordinate; |
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13 |
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14 import de.intevation.gnv.geobackend.base.Result; |
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15 import de.intevation.gnv.geobackend.base.query.QueryExecutor; |
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16 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory; |
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17 import de.intevation.gnv.geobackend.base.query.exception.QueryException; |
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18 import de.intevation.gnv.geobackend.sde.datasources.RasterObject; |
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19 |
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20 |
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21 /** |
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22 * @author Tim Englich <tim.englich@intevation.de> |
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23 * |
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24 */ |
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25 public class QueriedXYDepth implements XYDepth { |
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26 |
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27 /** |
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28 * the logger, used to log exceptions and additonaly information |
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29 */ |
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30 private static Logger log = Logger.getLogger(QueriedXYDepth.class); |
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31 |
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32 private String queryID = "rasterQuery"; |
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33 |
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34 private QueryExecutor queryExecutor = null; |
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35 |
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36 private ArrayList<RasterObject> rasterData = new ArrayList<RasterObject>(); |
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37 |
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38 /** |
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39 * Constructor |
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40 */ |
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41 public QueriedXYDepth() { |
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42 this.queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor(); |
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43 } |
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44 |
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45 /** |
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46 * @see de.intevation.gnv.math.XYDepth#depth(com.vividsolutions.jts.geom.Coordinate) |
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47 */ |
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48 public double depth(Coordinate coordinate) { |
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49 log.debug("QueriedXYDepth.depth for " + coordinate.x+" "+ coordinate.y); |
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50 double resultValue = Double.NaN; |
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51 |
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52 RasterObject ro = this.getRasterObject(coordinate); |
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53 |
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54 if (ro == null){ |
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55 Collection<Result> result = null; |
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56 try { |
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57 String[] filterValues = new String[]{"Point ("+coordinate.x+" "+coordinate.y+")"}; |
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58 result = this.queryExecutor.executeQuery(this.queryID,filterValues); |
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59 } catch (QueryException e) { |
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60 log.error(e,e); |
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61 } |
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62 |
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63 if (result != null){ |
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64 if (!result.isEmpty()){ |
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65 Result row = result.iterator().next(); |
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66 ro = (RasterObject)row.getObject(0); |
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67 synchronized (rasterData) { |
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68 rasterData.add(ro); |
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69 } |
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70 } |
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71 } |
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72 } |
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73 if (ro != null){ |
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74 resultValue = ro.getValue(coordinate); |
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75 } |
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76 return resultValue; |
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77 } |
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78 |
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79 private RasterObject getRasterObject(Coordinate coordinate){ |
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80 for (int i = 0; i < rasterData.size(); i++){ |
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81 RasterObject ro = rasterData.get(i); |
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82 if (ro.getEnvelope().contains(coordinate)){ |
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83 return ro; |
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84 } |
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85 } |
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86 return null; |
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87 |
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88 } |
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89 |
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90 } |