Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 1115:f953c9a559d8

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Added license file and license headers. gnv-artifacts/trunk@1260 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:46:55 +0000
parents 05bf8534a35a
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.math;
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10
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11 import com.vividsolutions.jts.geom.Coordinate;
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12
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13 import de.intevation.gnv.geobackend.base.Result;
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14
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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
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18 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
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19
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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 import java.lang.ref.SoftReference;
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25
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26 import java.util.ArrayList;
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27 import java.util.Collection;
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28
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29 import org.apache.log4j.Logger;
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30
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31 /**
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32 * This implementation uses the geo backend to query a depth via
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33 * a raster layer stored in the database.
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34 *
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35 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
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36 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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37 */
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38 public class QueriedXYDepth
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39 implements XYDepth
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40 {
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41 private static Logger log = Logger.getLogger(QueriedXYDepth.class);
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42
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43 private static final String queryID = "rasterQuery";
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44
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45 private QueryExecutor queryExecutor;
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46
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47 private ArrayList<SoftReference<RasterObject>> rasterData;
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48
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49 private RasterObject last;
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50
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51 private int interpolation;
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52
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53 /**
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54 * Default construtor. Interpolation method is bilinear.
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55 */
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56 public QueriedXYDepth() {
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57 this(RasterObject.BILINEAR);
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58 }
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59
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60 /**
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61 * Constructor to create a QueriedXYDepth with a given interpolation
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62 * method.
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63 * @param interpolation The interpolation method.
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64 */
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65 public QueriedXYDepth(int interpolation) {
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66 this.interpolation = interpolation;
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67 rasterData = new ArrayList<SoftReference<RasterObject>>();
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68 queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor();
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69 }
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70
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71 public double depth(Coordinate coordinate) {
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72 double resultValue = Double.NaN;
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73
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74 RasterObject ro = getRasterObject(coordinate);
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75
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76 if (ro == null) {
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77 try {
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78 String[] filterValues =
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79 new String[] { WKTUtils.toWKT(coordinate) };
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80 Collection<Result> result = queryExecutor.executeQuery(
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81 queryID, filterValues);
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82 for (Result row: result) {
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83 if ((ro = (RasterObject)row.getObject(0)) != null) {
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84 rasterData.add(
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85 new SoftReference<RasterObject>(last = ro));
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86 }
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87 break;
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88 }
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89 } catch (QueryException e) {
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90 log.error(e, e);
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91 }
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92 }
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93 return ro != null
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94 ? ro.getValue(coordinate, interpolation)
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95 : Double.NaN;
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96 }
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97
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98 private RasterObject getRasterObject(Coordinate coordinate) {
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99 if (last != null && last.contains(coordinate)) {
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100 return last;
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101 }
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102 for (int i = rasterData.size()-1; i >= 0; --i) {
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103 SoftReference<RasterObject> ref = rasterData.get(i);
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104 RasterObject ro = ref.get();
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105 if (ro != null && ro.contains(coordinate)) {
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106 return last = ro;
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107 }
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108 }
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109 return null;
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110 }
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111 }
http://dive4elements.wald.intevation.org