annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/QRangeTree.java @ 3441:bfbd478bd607

FixA: Moved Q -> W conversion code into segments to be reusable. flys-artifacts/trunk@5104 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 23 Jul 2012 14:19:07 +0000
parents 5642a83420f2
children 51f76225823b
rev   line source
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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.util.List;
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6 import java.util.ArrayList;
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7
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8 import org.apache.log4j.Logger;
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9
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10 public class QRangeTree
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11 implements Serializable
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12 {
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13 private static Logger log = Logger.getLogger(QRangeTree.class);
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14
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15 public static final double EPSILON = 1e-4;
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16
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17 public static class Node
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18 implements Serializable
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19 {
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20 Node left;
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21 Node right;
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22 Node prev;
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23 Node next;
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24
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25 double a;
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26 double b;
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27 double q;
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28
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29 public Node() {
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30 }
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31
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32 public Node(double a, double b, double q) {
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33 this.a = a;
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34 this.b = b;
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35 this.q = q;
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36 }
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37
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38 protected final double interpolatePrev(double pos) {
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39 /*
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40 f(prev.b) = prev.q
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41 f(a) = q
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42
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43 prev.q = m*prev.b + n
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44 q = m*a + n <=> n = q - m*a
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45
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46 q - prev.q = m*(a - prev.b)
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47
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48 m = (q - prev.q)/(a - prev.b) # a != prev.b
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49 */
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50
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51 if (a == prev.b) {
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52 return 0.5*(q + prev.q);
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53 }
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54 double m = (q - prev.q)/(a - prev.b);
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55 double n = q - m*a;
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56 return m*pos + n;
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57 }
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58
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59 protected final double interpolateNext(double pos) {
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60 /*
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61 f(next.a) = next.q
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62 f(b) = q
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63
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64 next.q = m*next.a + n
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65 q = m*b + n <=> n = q - m*b
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66
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67 q - next.q = m*(b - next.a)
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68 m = (q - next.q)/(b - next.a) # b != next.a
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69 */
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70
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71 if (b == next.a) {
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72 return 0.5*(q + next.q);
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73 }
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74 double m = (q - next.q)/(b - next.a);
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75 double n = q - m*b;
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76 return m*pos + n;
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77 }
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78
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79 public double findQ(double pos) {
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80
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81 Node current = this;
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82 for (;;) {
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83 if (pos < current.a) {
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84 if (current.left != null) {
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85 current = current.left;
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86 continue;
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87 }
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88 return current.prev != null
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89 ? current.interpolatePrev(pos)
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90 : Double.NaN;
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91 }
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92 if (pos > current.b) {
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93 if (current.right != null) {
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94 current = current.right;
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95 continue;
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96 }
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97 return current.next != null
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98 ? current.interpolateNext(pos)
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99 : Double.NaN;
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100 }
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101 return current.q;
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102 }
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103 }
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104 } // class Node
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105
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106 protected Node root;
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107
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108 public QRangeTree() {
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109 }
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110
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111 public static final class AccessQAB {
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112 private int startIndex;
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113
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114 public AccessQAB(int startIndex) {
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115 this.startIndex = startIndex;
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116 }
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117
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118 public Double getQ(Object [] row) {
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119 return (Double)row[startIndex];
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120 }
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121
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122 public Double getA(Object [] row) {
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123 return (Double)row[startIndex+1];
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parents: 1890
diff changeset
124 }
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parents: 1890
diff changeset
125
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diff changeset
126 public Double getB(Object [] row) {
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127 return (Double)row[startIndex+2];
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parents: 1890
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128 }
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parents: 1890
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129 }
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130
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diff changeset
131 public static final AccessQAB WITH_COLUMN = new AccessQAB(1);
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132 public static final AccessQAB WITHOUT_COLUMN = new AccessQAB(0);
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133
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diff changeset
134 /** wstQRanges need to be sorted by range.a */
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135 public QRangeTree(List<Object []> qRanges, int start, int stop) {
2609
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parents: 1890
diff changeset
136 this(qRanges, WITH_COLUMN, start, stop);
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parents: 1890
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137 }
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parents: 1890
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138
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parents: 1890
diff changeset
139 public QRangeTree(
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diff changeset
140 List<Object []> qRanges,
3076
5642a83420f2 FLYS artifacts: Removed trailing whitespace.
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parents: 2993
diff changeset
141 AccessQAB accessQAB,
2609
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diff changeset
142 int start,
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parents: 1890
diff changeset
143 int stop
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parents: 1890
diff changeset
144 ) {
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145 if (stop <= start) {
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diff changeset
146 return;
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parents: 625
diff changeset
147 }
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148
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parents: 2609
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149 int N = stop-start;
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150
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151 List<Node> nodes = new ArrayList<Node>(N);
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152
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153 Node last = null;
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154
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parents: 2609
diff changeset
155 for (int i = 0; i < N; ++i) {
1890
9144e5a5027b (Picky) cosmetics.
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 1020
diff changeset
156 Object [] qRange = qRanges.get(start + i);
2609
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parents: 1890
diff changeset
157 Double q = accessQAB.getQ(qRange);
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parents: 1890
diff changeset
158 Double a = accessQAB.getA(qRange);
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parents: 1890
diff changeset
159 Double b = accessQAB.getB(qRange);
632
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diff changeset
160
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parents: 2609
diff changeset
161 double av = a != null ? a.doubleValue() : -Double.MAX_VALUE;
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parents: 2609
diff changeset
162 double bv = b != null ? b.doubleValue() : Double.MAX_VALUE;
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parents: 2609
diff changeset
163 double qv = q.doubleValue();
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parents: 2609
diff changeset
164
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parents: 2609
diff changeset
165 // If nodes are directly neighbored and Qs are the same
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parents: 2609
diff changeset
166 // join them.
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parents: 2609
diff changeset
167 if (last != null
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parents: 2609
diff changeset
168 && Math.abs(last.b - av) < EPSILON
62e5c6fd2a0c Join nodes in Q tree if they span a continuous interval and have same Qs.
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parents: 2609
diff changeset
169 && Math.abs(last.q - qv) < EPSILON) {
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parents: 2609
diff changeset
170 last.b = bv;
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parents: 2609
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171 }
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parents: 2609
diff changeset
172 else {
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parents: 2609
diff changeset
173 nodes.add(last = new Node(av, bv, qv));
62e5c6fd2a0c Join nodes in Q tree if they span a continuous interval and have same Qs.
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parents: 2609
diff changeset
174 }
632
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parents: 625
diff changeset
175 }
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parents: 625
diff changeset
176
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49cfa5c66651 Squashed performance bug introduced in rev4070. Now CSV export is about 245 times faster.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2611
diff changeset
177 if (log.isDebugEnabled()) {
49cfa5c66651 Squashed performance bug introduced in rev4070. Now CSV export is about 245 times faster.
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parents: 2611
diff changeset
178 log.debug("Before/after nodes join: " +
49cfa5c66651 Squashed performance bug introduced in rev4070. Now CSV export is about 245 times faster.
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parents: 2611
diff changeset
179 N + "/" + nodes.size());
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parents: 2611
diff changeset
180 }
49cfa5c66651 Squashed performance bug introduced in rev4070. Now CSV export is about 245 times faster.
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parents: 2611
diff changeset
181
632
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parents: 625
diff changeset
182 root = wireTree(nodes);
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parents: 625
diff changeset
183 }
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parents: 625
diff changeset
184
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parents: 2609
diff changeset
185 protected static Node wireTree(List<Node> nodes) {
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parents: 2609
diff changeset
186 int N = nodes.size();
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parents: 2609
diff changeset
187 for (int i = 0; i < N; ++i) {
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parents: 2609
diff changeset
188 Node node = nodes.get(i);
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parents: 2609
diff changeset
189 if (i > 0 ) node.prev = nodes.get(i-1);
62e5c6fd2a0c Join nodes in Q tree if they span a continuous interval and have same Qs.
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parents: 2609
diff changeset
190 if (i < N-1) node.next = nodes.get(i+1);
625
c0c60a611fca Introduce model to store q values of WST columns efficiently.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
191 }
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parents:
diff changeset
192
2611
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parents: 2609
diff changeset
193 return buildTree(nodes, 0, N-1);
625
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parents:
diff changeset
194 }
c0c60a611fca Introduce model to store q values of WST columns efficiently.
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parents:
diff changeset
195
2611
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parents: 2609
diff changeset
196 protected static Node buildTree(List<Node> nodes, int lo, int hi) {
632
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diff changeset
197
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parents: 625
diff changeset
198 if (lo > hi) {
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parents: 625
diff changeset
199 return null;
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parents: 625
diff changeset
200 }
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parents: 625
diff changeset
201
625
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parents:
diff changeset
202 int mid = (lo + hi) >> 1;
2611
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parents: 2609
diff changeset
203 Node parent = nodes.get(mid);
625
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parents:
diff changeset
204
632
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parents: 625
diff changeset
205 parent.left = buildTree(nodes, lo, mid-1);
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parents: 625
diff changeset
206 parent.right = buildTree(nodes, mid+1, hi);
625
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parents:
diff changeset
207
c0c60a611fca Introduce model to store q values of WST columns efficiently.
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parents:
diff changeset
208 return parent;
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parents:
diff changeset
209 }
c0c60a611fca Introduce model to store q values of WST columns efficiently.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
210
c0c60a611fca Introduce model to store q values of WST columns efficiently.
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parents:
diff changeset
211 public double findQ(double pos) {
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parents:
diff changeset
212 return root != null ? root.findQ(pos) : Double.NaN;
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parents:
diff changeset
213 }
632
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
214
2993
70469e3d34b9 FixA: Made Delta W/t calculation finally work
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parents: 2612
diff changeset
215 @Override
70469e3d34b9 FixA: Made Delta W/t calculation finally work
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parents: 2612
diff changeset
216 public String toString() {
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parents: 2612
diff changeset
217 StringBuilder sb = new StringBuilder();
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parents: 2612
diff changeset
218 inorder(root, sb);
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parents: 2612
diff changeset
219 return sb.toString();
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parents: 2612
diff changeset
220 }
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parents: 2612
diff changeset
221
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diff changeset
222 protected static void inorder(Node node, StringBuilder sb) {
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parents: 2612
diff changeset
223 if (node != null) {
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parents: 2612
diff changeset
224 inorder(node.left, sb);
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parents: 2612
diff changeset
225 sb.append('[')
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parents: 2612
diff changeset
226 .append(node.a)
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parents: 2612
diff changeset
227 .append(", ")
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parents: 2612
diff changeset
228 .append(node.b)
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parents: 2612
diff changeset
229 .append(": ")
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parents: 2612
diff changeset
230 .append(node.q)
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parents: 2612
diff changeset
231 .append(']');
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parents: 2612
diff changeset
232 inorder(node.right, sb);
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parents: 2612
diff changeset
233 }
70469e3d34b9 FixA: Made Delta W/t calculation finally work
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parents: 2612
diff changeset
234 }
70469e3d34b9 FixA: Made Delta W/t calculation finally work
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parents: 2612
diff changeset
235
632
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diff changeset
236 private static final String name(Object o) {
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parents: 625
diff changeset
237 return String.valueOf(System.identityHashCode(o) & 0xffffffffL);
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
238 }
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
239
07640ab913fd First part of storing qs in ranges
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diff changeset
240 public String toGraph() {
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parents: 625
diff changeset
241 StringBuilder sb = new StringBuilder();
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parents: 625
diff changeset
242 sb.append("subgraph c");
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parents: 625
diff changeset
243 sb.append(name(this));
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parents: 625
diff changeset
244 sb.append(" {\n");
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
245 if (root != null) {
1020
a776afdf1ec5 Cosmetic: Replaced usage of legacy java.util.Stack with java.util.Deque.
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246 java.util.Deque<Node> stack = new java.util.ArrayDeque<Node>();
632
07640ab913fd First part of storing qs in ranges
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247 stack.push(root);
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a776afdf1ec5 Cosmetic: Replaced usage of legacy java.util.Stack with java.util.Deque.
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248 while (!stack.isEmpty()) {
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249 Node current = stack.pop();
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250 String name = "n" + name(current);
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251 sb.append(name);
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252 sb.append(" [label=\"");
07640ab913fd First part of storing qs in ranges
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253 sb.append(current.a).append(", ").append(current.b);
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254 sb.append(": ").append(current.q).append("\"]\n");
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diff changeset
255 if (current.left != null) {
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parents: 625
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256 String leftName = name(current.left);
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257 sb.append(name).append(" -- n").append(leftName).append("\n");
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parents: 625
diff changeset
258 stack.push(current.left);
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
259 }
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
260 if (current.right != null) {
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
261 String rightName = name(current.right);
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parents: 625
diff changeset
262 sb.append(name).append(" -- n").append(rightName).append("\n");
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parents: 625
diff changeset
263 stack.push(current.right);
07640ab913fd First part of storing qs in ranges
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 625
diff changeset
264 }
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
265 }
07640ab913fd First part of storing qs in ranges
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parents: 625
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266 }
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parents: 625
diff changeset
267 sb.append("}\n");
07640ab913fd First part of storing qs in ranges
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diff changeset
268 return sb.toString();
07640ab913fd First part of storing qs in ranges
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parents: 625
diff changeset
269 }
625
c0c60a611fca Introduce model to store q values of WST columns efficiently.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
270 }
c0c60a611fca Introduce model to store q values of WST columns efficiently.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
271 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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