Mercurial > dive4elements > gnv-client

comparison gnv-artifacts/src/main/java/de/intevation/gnv/math/QueriedXYDepth.java @ 1119:7c4f81f74c47

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merged gnv-artifacts
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:00 +0200
parents f953c9a559d8
children
comparison
equal deleted inserted replaced
1027:fca4b5eb8d2f 1119:7c4f81f74c47
1 /*
2 * Copyright (c) 2010 by Intevation GmbH
3 *
4 * This program is free software under the LGPL (>=v2.1)
5 * Read the file LGPL.txt coming with the software for details
6 * or visit http://www.gnu.org/licenses/ if it does not exist.
7 */
8
9 package de.intevation.gnv.math;
10
11 import com.vividsolutions.jts.geom.Coordinate;
12
13 import de.intevation.gnv.geobackend.base.Result;
14
15 import de.intevation.gnv.geobackend.base.query.QueryExecutor;
16 import de.intevation.gnv.geobackend.base.query.QueryExecutorFactory;
17
18 import de.intevation.gnv.geobackend.base.query.exception.QueryException;
19
20 import de.intevation.gnv.geobackend.sde.datasources.RasterObject;
21
22 import de.intevation.gnv.utils.WKTUtils;
23
24 import java.lang.ref.SoftReference;
25
26 import java.util.ArrayList;
27 import java.util.Collection;
28
29 import org.apache.log4j.Logger;
30
31 /**
32 * This implementation uses the geo backend to query a depth via
33 * a raster layer stored in the database.
34 *
35 * @author <a href="mailto:tim.englich@intevation.de">Tim Englich</a>
36 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
37 */
38 public class QueriedXYDepth
39 implements XYDepth
40 {
41 private static Logger log = Logger.getLogger(QueriedXYDepth.class);
42
43 private static final String queryID = "rasterQuery";
44
45 private QueryExecutor queryExecutor;
46
47 private ArrayList<SoftReference<RasterObject>> rasterData;
48
49 private RasterObject last;
50
51 private int interpolation;
52
53 /**
54 * Default construtor. Interpolation method is bilinear.
55 */
56 public QueriedXYDepth() {
57 this(RasterObject.BILINEAR);
58 }
59
60 /**
61 * Constructor to create a QueriedXYDepth with a given interpolation
62 * method.
63 * @param interpolation The interpolation method.
64 */
65 public QueriedXYDepth(int interpolation) {
66 this.interpolation = interpolation;
67 rasterData = new ArrayList<SoftReference<RasterObject>>();
68 queryExecutor = QueryExecutorFactory.getInstance().getQueryExecutor();
69 }
70
71 public double depth(Coordinate coordinate) {
72 double resultValue = Double.NaN;
73
74 RasterObject ro = getRasterObject(coordinate);
75
76 if (ro == null) {
77 try {
78 String[] filterValues =
79 new String[] { WKTUtils.toWKT(coordinate) };
80 Collection<Result> result = queryExecutor.executeQuery(
81 queryID, filterValues);
82 for (Result row: result) {
83 if ((ro = (RasterObject)row.getObject(0)) != null) {
84 rasterData.add(
85 new SoftReference<RasterObject>(last = ro));
86 }
87 break;
88 }
89 } catch (QueryException e) {
90 log.error(e, e);
91 }
92 }
93 return ro != null
94 ? ro.getValue(coordinate, interpolation)
95 : Double.NaN;
96 }
97
98 private RasterObject getRasterObject(Coordinate coordinate) {
99 if (last != null && last.contains(coordinate)) {
100 return last;
101 }
102 for (int i = rasterData.size()-1; i >= 0; --i) {
103 SoftReference<RasterObject> ref = rasterData.get(i);
104 RasterObject ro = ref.get();
105 if (ro != null && ro.contains(coordinate)) {
106 return last = ro;
107 }
108 }
109 return null;
110 }
111 }
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