Mercurial > dive4elements > river

annotate flys-backend/src/main/java/de/intevation/flys/model/River.java @ 472:1e196c75563b

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Added a new method to determine the selected gauge of a river based on a start and end point. flys-backend/trunk@1711 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 18 Apr 2011 07:29:05 +0000
parents c2c3ad4fda58
children b316d2106598
rev   line source
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1 package de.intevation.flys.model;
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2
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3 import java.io.Serializable;
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4
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5 import java.math.BigDecimal;
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6
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7 import javax.persistence.Entity;
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8 import javax.persistence.Id;
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9 import javax.persistence.Table;
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10 import javax.persistence.GeneratedValue;
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11 import javax.persistence.Column;
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12 import javax.persistence.SequenceGenerator;
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13 import javax.persistence.OneToMany;
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14 import javax.persistence.JoinColumn;
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15 import javax.persistence.GenerationType;
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16
174
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17 import java.util.List;
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18
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19 import org.hibernate.Session;
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20 import org.hibernate.Query;
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21
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22 import de.intevation.flys.backend.SessionHolder;
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23
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24
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25 @Entity
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26 @Table(name = "rivers")
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27 public class River
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28 implements Serializable
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29 {
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30 private Integer id;
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31
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32 private String name;
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33
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34 private List<Gauge> gauges;
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35
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36 @Id
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37 @SequenceGenerator(
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38 name = "SEQUENCE_RIVERS_ID_SEQ",
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39 sequenceName = "RIVERS_ID_SEQ",
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40 allocationSize = 1)
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41 @GeneratedValue(
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42 strategy = GenerationType.SEQUENCE,
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43 generator = "SEQUENCE_RIVERS_ID_SEQ")
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44 @Column(name = "id")
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45 public Integer getId() {
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46 return id;
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47 }
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48
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49 public void setId(Integer id) {
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50 this.id = id;
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51 }
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52
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53 @Column(name = "name")
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54 public String getName() {
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55 return name;
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56 }
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57
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58 public void setName(String name) {
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59 this.name = name;
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60 }
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61
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62 public River() {
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63 }
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64
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65 public River(String name) {
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66 this.name = name;
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67 }
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68
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69 @OneToMany
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70 @JoinColumn(name="river_id")
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71 public List<Gauge> getGauges() {
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72 return gauges;
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73 }
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74
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75 public void setGauges(List<Gauge> gauges) {
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76 this.gauges = gauges;
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77 }
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78
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79 public String toString() {
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80 return name != null ? name : "";
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81 }
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82
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83
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84 /**
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85 * This method returns the first gauge that is intersected by <i>a</i> and
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86 * <i>b</i>,
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87 *
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88 * @param a A start point.
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89 * @param b An end point.
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90 *
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91 * @return the first intersecting gauge.
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92 */
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93 public Gauge determineGauge(double a, double b) {
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94 Session session = SessionHolder.HOLDER.get();
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95
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96 Query query = session.createQuery(
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97 "from Gauge where river=:river " +
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98 "and not (range.a > :b or range.b < :a) order by a");
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99 query.setParameter("river", this);
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100 query.setParameter("a", new BigDecimal(a));
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101 query.setParameter("b", new BigDecimal(b));
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102
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103 List<Gauge> gauges = query.list();
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104
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105 return gauges != null && gauges.size() > 0 ? gauges.get(0) : null;
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106 }
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107
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108 /**
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109 * Returns the min and max distance of this river. The first position in the
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110 * resulting array contains the min distance, the second position the max
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111 * distance.
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112 *
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113 * @return the min and max distance of this river.
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114 */
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115 public double[] determineMinMaxDistance() {
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116 if (gauges == null) {
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117 return null;
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118 }
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119
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120 double minmax[] = new double[] { Double.MAX_VALUE, Double.MIN_VALUE };
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121
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122 for (Gauge g: gauges) {
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123 Range r = g.getRange();
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124
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125 double a = r.getA().doubleValue();
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
126 minmax[0] = minmax[0] < a ? minmax[0] : a;
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
127
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
128 BigDecimal bigB = r.getB();
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
129 if (bigB != null) {
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
130 double b = bigB.doubleValue();
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
131 minmax[1] = minmax[1] > b ? minmax[1] : b;
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
132 }
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
133 }
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
134
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
135 return minmax;
c2c3ad4fda58 Added a method to River that returns the min and max distance of the river.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 188
diff changeset
136 }
167
15d515fe15f5 Added POJOs to be mapped to schema.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137 }
15d515fe15f5 Added POJOs to be mapped to schema.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org