Mercurial > dive4elements > river

annotate flys-backend/src/main/java/de/intevation/flys/model/River.java @ 764:e09f00ecb915

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river model: Added method to find gauge by a position lying in its range. flys-backend/trunk@2160 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 18 Jun 2011 20:13:31 +0000
parents c19d4c643526
children 5572d051347e
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 boolean kmUp;
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35
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36 private List<Gauge> gauges;
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37
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38 @Id
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39 @SequenceGenerator(
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40 name = "SEQUENCE_RIVERS_ID_SEQ",
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41 sequenceName = "RIVERS_ID_SEQ",
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42 allocationSize = 1)
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43 @GeneratedValue(
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44 strategy = GenerationType.SEQUENCE,
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45 generator = "SEQUENCE_RIVERS_ID_SEQ")
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46 @Column(name = "id")
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47 public Integer getId() {
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48 return id;
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49 }
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50
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51 public void setId(Integer id) {
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52 this.id = id;
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53 }
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54
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55 @Column(name = "name")
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56 public String getName() {
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57 return name;
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58 }
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59
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60 public void setName(String name) {
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61 this.name = name;
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62 }
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63
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64 @Column(name = "km_up")
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65 public boolean getKmUp() {
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66 return kmUp;
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67 }
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68
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69 public void setKmUp(boolean kmUp) {
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70 this.kmUp = kmUp;
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71 }
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72
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73 public River() {
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74 }
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75
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76 public River(String name) {
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77 this.name = name;
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78 }
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79
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80 @OneToMany
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81 @JoinColumn(name="river_id")
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82 public List<Gauge> getGauges() {
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83 return gauges;
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84 }
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85
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86 public void setGauges(List<Gauge> gauges) {
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87 this.gauges = gauges;
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88 }
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89
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90 public String toString() {
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91 return name != null ? name : "";
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92 }
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93
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94
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95 /**
488
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96 * This method returns the gauges that intersect with <i>a</i> and
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97 * <i>b</i>,
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98 *
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99 * @param a A start point.
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100 * @param b An end point.
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101 *
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102 * @return the intersecting gauges.
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103 */
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104 public List<Gauge> determineGauges(double a, double b) {
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105 Session session = SessionHolder.HOLDER.get();
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106
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107 if (a > b) { double t = a; a = b; b = t; }
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108
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109 Query query = session.createQuery(
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110 "from Gauge where river=:river " +
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111 "and not (range.a > :b or range.b < :a) order by a");
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112 query.setParameter("river", this);
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113 query.setParameter("a", new BigDecimal(a));
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114 query.setParameter("b", new BigDecimal(b));
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115
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116 return query.list();
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117 }
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118
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119 public Gauge determineGaugeByPosition(double p) {
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120 Session session = SessionHolder.HOLDER.get();
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121 Query query = session.createQuery(
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122 "from Gauge where river=:river " +
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123 "and :p between range.a and range.b");
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124 query.setParameter("river", this);
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125 query.setParameter("p", new BigDecimal(p));
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126 List<Gauge> gauges = query.list();
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127 return gauges.isEmpty() ? null : gauges.get(0);
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128 }
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129
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130 public Gauge determineGaugeByStation(double a, double b) {
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131
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132 if (a > b) { double t = a; a = b; b = t; }
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133
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134 Session session = SessionHolder.HOLDER.get();
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135
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136 Query query = session.createQuery(
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137 "from Gauge where river.id=:river " +
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138 "and station between :a and :b");
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139 query.setParameter("river", getId());
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140 query.setParameter("a", new BigDecimal(a));
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141 query.setParameter("b", new BigDecimal(b));
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142
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143 List<Gauge> gauges = query.list();
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144 return gauges.isEmpty() ? null : gauges.get(0);
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145 }
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146
488
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147
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148 /**
472
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149 * This method returns the first gauge that is intersected by <i>a</i> and
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150 * <i>b</i>,
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151 *
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152 * @param a A start point.
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153 * @param b An end point.
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154 *
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155 * @return the first intersecting gauge.
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156 */
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157 public Gauge determineGauge(double a, double b) {
488
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158 List<Gauge> gauges = determineGauges(a, b);
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159
756
ca13926b8871 River: Make search for gauges independent of from/to order.
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160 return gauges.isEmpty() ? null : gauges.get(0);
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161 }
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162
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163 /**
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164 * Returns the min and max distance of this river. The first position in the
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165 * resulting array contains the min distance, the second position the max
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166 * distance.
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167 *
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168 * @return the min and max distance of this river.
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169 */
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170 public double[] determineMinMaxDistance() {
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171 if (gauges == null) {
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172 return null;
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173 }
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174
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175 double minmax[] = new double[] { Double.MAX_VALUE, Double.MIN_VALUE };
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176
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177 for (Gauge g: gauges) {
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178 Range r = g.getRange();
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179
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180 double a = r.getA().doubleValue();
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181 minmax[0] = minmax[0] < a ? minmax[0] : a;
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182
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183 BigDecimal bigB = r.getB();
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184 if (bigB != null) {
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185 double b = bigB.doubleValue();
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186 minmax[1] = minmax[1] > b ? minmax[1] : b;
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187 }
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188 }
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189
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190 return minmax;
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191 }
167
15d515fe15f5 Added POJOs to be mapped to schema.
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192 }
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parents:
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193 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org