Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 457:47ad9721e692

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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>
date Tue, 05 Jan 2010 14:12:03 +0000
parents 363236fc462d
children 92d6cf448598
rev   line source
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363236fc462d Added Rasterdatasupport to VerticalCrossSections
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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 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 }
http://dive4elements.wald.intevation.org