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annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/QRangeTree.java @ 625:c0c60a611fca

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Introduce model to store q values of WST columns efficiently. flys-artifacts/trunk@1983 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 23 May 2011 22:33:37 +0000
parents
children 07640ab913fd
rev   line source
625
c0c60a611fca Introduce model to store q values of WST columns efficiently.
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1 package de.intevation.flys.artifacts.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 java.util.List;
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8
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9 import de.intevation.flys.model.WstQRange;
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10 import de.intevation.flys.model.Range;
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11
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12 public class QRangeTree
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13 implements Serializable
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14 {
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15 public static class Node
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16 implements Serializable
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17 {
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18 Node left;
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19 Node right;
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20 Node prev;
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21 Node next;
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22
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23 double a;
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24 double b;
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25 double q;
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26
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27 public Node() {
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28 }
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29
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30 public Node(double a, double b, double q) {
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31 this.a = a;
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32 this.b = b;
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33 this.q = q;
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34 }
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35
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36 protected final double interpolatePrev(double pos) {
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37 /*
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38 f(prev.b) = prev.q
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39 f(a) = q
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40
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41 prev.q = m*prev.b + n
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42 q = m*a + n <=> n = q - m*a
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43
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44 q - prev.q = m*(a - prev.b)
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45
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46 m = (q - prev.q)/(a - prev.b) # a != prev.b
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47 */
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48
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49 if (a == prev.b) {
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50 return 0.5*(q + prev.q);
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51 }
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52 double m = (q - prev.q)/(a - prev.b);
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53 double n = q - m*a;
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54 return m*pos + n;
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55 }
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56
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57 protected final double interpolateNext(double pos) {
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58 /*
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59 f(next.a) = next.q
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60 f(b) = q
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61
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62 next.q = m*next.a + n
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63 q = m*b + n <=> n = q - m*b
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64
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65 q - next.q = m*(b - next.a)
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66 m = (q - next.q)/(b - next.a) # b != next.a
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67 */
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68
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69 if (b == next.a) {
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70 return 0.5*(q + next.q);
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71 }
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72 double m = (q - next.q)/(b - next.a);
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73 double n = q - m*b;
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74 return m*pos + n;
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75 }
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76
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77 public double findQ(double pos) {
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78 Node current = this;
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79 for (;;) {
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80 if (pos < current.a) {
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81 if (current.left != null) {
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82 current = current.left;
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83 continue;
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84 }
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85 return current.left != null
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86 ? current.interpolatePrev(pos)
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87 : Double.NaN;
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88 }
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89 if (pos > current.b) {
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90 if (current.right != null) {
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91 current = current.right;
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92 continue;
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93 }
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94 return current.right != null
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95 ? current.interpolateNext(pos)
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96 : Double.NaN;
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97 }
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98 return current.q;
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99 }
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100 }
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101 } // class Node
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102
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103 protected Node root;
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104
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105 public QRangeTree() {
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106 }
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107
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108 /** wstQRanges need to sorted by range.a */
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109 public QRangeTree(List<WstQRange> wstQRanges) {
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110
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111 if (wstQRanges.isEmpty()) {
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112 return;
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113 }
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114
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115 Node [] nodes = new Node[wstQRanges.size()];
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116 for (int i = 0; i < nodes.length; ++i) {
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117 WstQRange wstQRange = wstQRanges.get(i);
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118 Range range = wstQRange.getRange();
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119 BigDecimal a = range.getA();
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120 BigDecimal b = range.getB();
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121 nodes[i] = new Node(
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122 a != null ? a.doubleValue() : -Double.MAX_VALUE,
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123 b != null ? b.doubleValue() : Double.MAX_VALUE,
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124 wstQRange.getQ().doubleValue());
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125 }
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126
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127 for (int i = 0; i < nodes.length; ++i) {
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128 Node node = nodes[i];
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129 if (i > 0 ) node.prev = nodes[i-1];
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130 if (i < nodes.length-1) node.next = nodes[i+1];
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131 }
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132
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133 root = buildTree(nodes, 0, nodes.length-1);
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134 }
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135
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136 protected static Node buildTree(Node [] nodes, int lo, int hi) {
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137 int mid = (lo + hi) >> 1;
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138 Node parent = nodes[mid];
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139
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140 if (hi > lo) {
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141 parent.left = buildTree(nodes, lo, mid-1);
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142 parent.right = buildTree(nodes, mid+1, hi);
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143 }
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144
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145 return parent;
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146 }
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147
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148 public double findQ(double pos) {
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149 return root != null ? root.findQ(pos) : Double.NaN;
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150 }
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151 }
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152 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org