Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DischargeTables.java @ 5415:5bac3e75f59c

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WaterlevelSelectState: Avoid npe with extreme results.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 26 Mar 2013 09:40:05 +0100
parents 5f38d1c39ebd
children
rev   line source
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.util.List;
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4 import java.util.Map;
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5 import java.util.HashMap;
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6 import java.util.Arrays;
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7
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8 import java.io.Serializable;
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10 import org.hibernate.Session;
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11 import org.hibernate.Query;
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13 import org.apache.log4j.Logger;
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15 import de.intevation.flys.backend.SessionHolder;
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16 import de.intevation.flys.model.Gauge;
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17 import de.intevation.flys.model.DischargeTable;
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18 import de.intevation.flys.model.DischargeTableValue;
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20 import gnu.trove.TDoubleArrayList;
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22 /** Documentation goes here. */
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23 public class DischargeTables
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24 implements Serializable
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25 {
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26 /** Private logger. */
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27 private static Logger log = Logger.getLogger(DischargeTables.class);
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29 /** Scale to convert discharge table values of master table into [cm]. */
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30 public static final double MASTER_SCALE = 100d;
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32 /** Scale to convert discharge table values of historical tables into [cm]. */
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33 public static final double HISTORICAL_SCALE = 1d;
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35 public static final int MASTER = 0;
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37 protected List<String> gaugeNames;
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39 protected String riverName;
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41 protected double scale;
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43 protected int kind;
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45 protected Map<String, double [][]> values;
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47 public DischargeTables() {
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48 }
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49
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50 public DischargeTables(String riverName, String gaugeName) {
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51 this(riverName, gaugeName, MASTER);
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52 }
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53
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54 public DischargeTables(String riverName, String gaugeName, int kind) {
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55 this(riverName, new String [] { gaugeName }, kind);
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56 }
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58 public DischargeTables(String riverName, String [] gaugeNames) {
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59 this(riverName, gaugeNames, MASTER);
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60 }
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62 public DischargeTables(String riverName, String [] gaugeNames, int kind) {
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63 this(riverName, Arrays.asList(gaugeNames), kind);
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64 }
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66 public DischargeTables(
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67 String riverName,
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68 List<String> gaugeNames,
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69 int kind
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70 ) {
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71 scale = Double.NaN;
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72 this.kind = kind;
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73 this.riverName = riverName;
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74 this.gaugeNames = gaugeNames;
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75 }
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76
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77 public double [][] getFirstTable() {
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78 return getFirstTable(MASTER_SCALE);
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79 }
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81 public double [][] getFirstTable(double scale) {
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82 Map<String, double [][]> values = getValues(scale);
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83 for (double [][] table: values.values()) {
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84 return table;
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85 }
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86 return null;
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87 }
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89 public Map<String, double [][]> getValues() {
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90 return getValues(MASTER_SCALE);
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91 }
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92
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93 public Map<String, double [][]> getValues(double scale) {
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94 if (values == null || scale != this.scale) {
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95 values = loadValues(scale);
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96 this.scale = scale;
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97 }
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98 return values;
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99 }
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100
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101 /**
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102 * Returns mapping of gauge name to values.
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103 */
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104 protected Map<String, double [][]> loadValues(double scale) {
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105 Map<String, double [][]> values = new HashMap<String, double [][]>();
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106
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107 Session session = SessionHolder.HOLDER.get();
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108
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109 Query gaugeQuery = session.createQuery(
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110 "from Gauge where name=:gauge and river.name=:river");
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111 gaugeQuery.setParameter("river", riverName);
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112
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113 for (String gaugeName: gaugeNames) {
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114 gaugeQuery.setParameter("gauge", gaugeName);
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115 List<Gauge> gauges = gaugeQuery.list();
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diff changeset
116 if (gauges.isEmpty()) {
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diff changeset
117 log.warn(
ea3a438a7021 Backend access: Static methods are using the SessionHolder, too.
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parents: 154
diff changeset
118 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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parents: 154
diff changeset
119 continue;
ea3a438a7021 Backend access: Static methods are using the SessionHolder, too.
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parents: 154
diff changeset
120 }
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parents: 154
diff changeset
121 Gauge gauge = gauges.get(0);
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
122
311
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parents: 154
diff changeset
123 List<DischargeTable> tables = gauge.getDischargeTables();
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
124
311
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diff changeset
125 if (tables.isEmpty()) {
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parents: 154
diff changeset
126 log.warn(
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diff changeset
127 "no discharge table for gauge '" + gaugeName + "'");
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parents: 154
diff changeset
128 continue;
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
129 }
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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parents:
diff changeset
130
311
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131 // TODO: Filter by time interval
4919
dbe9b7d6b80b Find correct discharge table for gauge.
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132 DischargeTable table = null;
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133 for (DischargeTable dt : tables) {
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parents: 4226
diff changeset
134 if (dt.getKind() == 0) {
dbe9b7d6b80b Find correct discharge table for gauge.
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parents: 4226
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135 table = dt;
dbe9b7d6b80b Find correct discharge table for gauge.
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diff changeset
136 break;
dbe9b7d6b80b Find correct discharge table for gauge.
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parents: 4226
diff changeset
137 }
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
138 }
dbe9b7d6b80b Find correct discharge table for gauge.
Raimund Renkert <rrenkert@intevation.de>
parents: 4226
diff changeset
139 if (table == null) {
dbe9b7d6b80b Find correct discharge table for gauge.
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parents: 4226
diff changeset
140 table = tables.get(0);
dbe9b7d6b80b Find correct discharge table for gauge.
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parents: 4226
diff changeset
141 }
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diff changeset
142 double [][] vs = loadDischargeTableValues(table, scale);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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parents: 328
diff changeset
143
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144 values.put(gaugeName, vs);
146
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parents:
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145 }
311
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diff changeset
146
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diff changeset
147 return values;
146
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parents:
diff changeset
148 }
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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diff changeset
149
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
150
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
151 /**
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
152 * @param table The discharge table
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
153 * @param scale The scale factor to adjust W and Q values.
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
154 *
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
155 * @return the values of a discharge table.
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
156 */
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
157 public static double[][] loadDischargeTableValues(
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
158 DischargeTable table,
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diff changeset
159 double scale
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
160 ) {
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
161 List<DischargeTableValue> dtvs = table.getDischargeTableValues();
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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parents: 1929
diff changeset
162
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
163 final double [][] vs = new double[2][dtvs.size()];
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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diff changeset
164
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
165 int idx = 0;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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parents: 1929
diff changeset
166 for (DischargeTableValue dtv: dtvs) {
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
167 double q = dtv.getQ().doubleValue();
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
168 vs[0][idx] = q * scale;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
169 vs[1][idx] = dtv.getW().doubleValue() * scale;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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parents: 1929
diff changeset
170 ++idx;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
171 }
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
172
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
173 return vs;
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
174 }
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 1929
diff changeset
175
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diff changeset
176 private static final double EPSILON = 1e-5;
2230
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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parents: 1929
diff changeset
177
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diff changeset
178 private static final boolean epsEquals(double a, double b) {
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diff changeset
179 return Math.abs(a - b) < EPSILON;
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diff changeset
180 }
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diff changeset
181
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diff changeset
182 private static final boolean between(double a, double b, double x) {
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diff changeset
183 if (a > b) { double t = a; a = b; b = t; }
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diff changeset
184 return x > a && x < b;
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diff changeset
185 }
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parents: 2230
diff changeset
186
5340
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
187 /**
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
188 * Find or interpolate Qs from q/w array.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
189 * @param values [[q0,q1,q2],[w0,w1,w2]]
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
190 * @param w W value to look for in values.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4919
diff changeset
191 */
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diff changeset
192 public static double [] getQsForW(double [][] values, double w) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
diff changeset
193
20c3a5b36434 Repaired DischargeTables.getQForW()
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 376
diff changeset
194 boolean debug = log.isDebugEnabled();
20c3a5b36434 Repaired DischargeTables.getQForW()
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parents: 376
diff changeset
195
20c3a5b36434 Repaired DischargeTables.getQForW()
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parents: 376
diff changeset
196 if (debug) {
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parents: 2230
diff changeset
197 log.debug("getQsForW: W = " + w);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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parents: 328
diff changeset
198 }
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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parents: 328
diff changeset
199
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parents: 2230
diff changeset
200 double [] qs = values[0];
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parents: 2230
diff changeset
201 double [] ws = values[1];
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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parents: 328
diff changeset
202
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parents: 2230
diff changeset
203 int N = Math.min(qs.length, ws.length);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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parents: 328
diff changeset
204
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parents: 2230
diff changeset
205 if (N == 0) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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parents: 376
diff changeset
206 if (debug) {
2418
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parents: 2230
diff changeset
207 log.debug("Q(" + w + ") = []");
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parents: 2230
diff changeset
208 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
209 return new double [0];
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parents: 2230
diff changeset
210 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
211
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
212 TDoubleArrayList outQs = new TDoubleArrayList();
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
213
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
214 if (epsEquals(ws[0], w)) {
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parents: 2230
diff changeset
215 outQs.add(qs[0]);
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
216 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
217
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
218 for (int i = 1; i < N; ++i) {
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parents: 2230
diff changeset
219 if (epsEquals(ws[i], w)) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
220 outQs.add(qs[i]);
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
221 }
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
222 else if (between(ws[i-1], ws[i], w)) {
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
223 double w1 = ws[i-1];
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parents: 2230
diff changeset
224 double w2 = ws[i];
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parents: 2230
diff changeset
225 double q1 = qs[i-1];
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parents: 2230
diff changeset
226 double q2 = qs[i];
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
227
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
228 // q1 = m*w1 + b
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parents: 2230
diff changeset
229 // q2 = m*w2 + b
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parents: 2230
diff changeset
230 // q2 - q1 = m*(w2 - w1)
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parents: 2230
diff changeset
231 // m = (q2 - q1)/(w2 - w1) # w2 != w1
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parents: 2230
diff changeset
232 // b = q1 - m*w1
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parents: 2230
diff changeset
233 // w1 != w2
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parents: 2230
diff changeset
234
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
diff changeset
235 double m = (q2 - q1)/(w2 - w1);
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
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parents: 2230
diff changeset
236 double b = q1 - m*w1;
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237 double q = w*m + b;
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238
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239 outQs.add(q);
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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240 }
329
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241 }
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242
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243 double [] result = outQs.toNativeArray();
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244
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245 if (debug) {
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246 log.debug("Q(" + w + ") = " + Arrays.toString(result));
378
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247 }
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248
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249 return result;
329
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250 }
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251
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252 public static double [] getWsForQ(double [][] values, double q) {
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253
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254 boolean debug = log.isDebugEnabled();
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255
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256 if (debug) {
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257 log.debug("getWsForQ: W = " + q);
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258 }
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259
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260 double [] qs = values[0];
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261 double [] ws = values[1];
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262
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263 int N = Math.min(qs.length, ws.length);
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264
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265 if (N == 0) {
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266 if (debug) {
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267 log.debug("W(" + q + ") = []");
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268 }
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269 return new double [0];
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270 }
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271
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272 TDoubleArrayList outWs = new TDoubleArrayList();
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273
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274 if (epsEquals(qs[0], q)) {
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275 outWs.add(ws[0]);
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276 }
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277
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278 for (int i = 1; i < N; ++i) {
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279 if (epsEquals(qs[i], q)) {
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280 outWs.add(ws[i]);
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281 }
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282 else if (between(qs[i-1], qs[i], q)) {
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283 double w1 = ws[i-1];
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284 double w2 = ws[i];
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285 double q1 = qs[i-1];
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286 double q2 = qs[i];
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287
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288 // w1 = m*q1 + b
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289 // w2 = m*q2 + b
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290 // w2 - w1 = m*(q2 - q1)
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291 // m = (w2 - w1)/(q2 - q1) # q2 != q1
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292 // b = w1 - m*q1
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293 // q1 != q2
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294
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295 double m = (w2 - w1)/(q2 - q1);
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296 double b = w1 - m*q1;
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297 double w = q*m + b;
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298
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299 outWs.add(w);
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300 }
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301 }
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302
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303 double [] result = outWs.toNativeArray();
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304
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305 if (debug) {
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306 log.debug("W(" + q + ") = " + Arrays.toString(result));
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307 }
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308
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309 return result;
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310 }
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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311 }
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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312 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org