Mercurial > dive4elements > river

annotate gwt-client/src/main/java/org/dive4elements/river/client/client/ui/chart/DistinctValuesNaviChartStepper.java @ 9263:abf14917be32

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Moved stepping behaviour of NaviOutputChart into an exchangeable strategy. Allows for distinct values stepping of sinfo flood duration.
author gernotbelger
date Tue, 17 Jul 2018 19:48:18 +0200
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rev   line source
9263
abf14917be32 Moved stepping behaviour of NaviOutputChart into an exchangeable strategy.
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1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by
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3 * Björnsen Beratende Ingenieure GmbH
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4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
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5 *
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6 * This file is Free Software under the GNU AGPL (>=v3)
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7 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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8 * documentation coming with Dive4Elements River for details.
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9 */
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10 package org.dive4elements.river.client.client.ui.chart;
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11
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12 import java.util.Set;
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13 import java.util.SortedSet;
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14 import java.util.TreeSet;
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15
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16 /**
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17 * Allows stepping through a list of distinct (known) values.
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18 *
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19 * @author Gernot Belger
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20 */
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21 public class DistinctValuesNaviChartStepper implements INaviChartStepper {
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22
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23 private final TreeSet<Double> validSteps = new TreeSet<Double>();
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24
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25 private double currentKm;
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26
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27 public DistinctValuesNaviChartStepper(final Set<Double> validKms) {
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28 this.validSteps.addAll(validKms);
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29
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30 if (this.validSteps.isEmpty())
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31 this.validSteps.add(-1d);
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32
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33 this.currentKm = this.validSteps.first();
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34 }
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35
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36 @Override
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37 public double getCurrentKm() {
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38 return this.currentKm;
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39 }
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40
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41 @Override
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42 public double stepForward() {
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43 this.currentKm = calculateStepFormward();
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44 return this.currentKm;
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45 }
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46
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47 private double calculateStepFormward() {
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48 // REMARK: can't use higher due to gwt bug
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49 // final Double next = this.validSteps.higher(this.currentKm);
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50
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51 // REMAREK: add a bit, because tailSet is inclusive
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52 final SortedSet<Double> tailSet = this.validSteps.tailSet(this.currentKm + 1e-6);
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53 final Double next = tailSet.isEmpty() ? null : tailSet.first();
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54
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55 if (next != null)
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56 return next;
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57
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58 return this.validSteps.last();
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59 }
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60
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61 @Override
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62 public double stepBackward() {
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63 this.currentKm = calculateStepBackward();
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64 return this.currentKm;
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65 }
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66
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67 private double calculateStepBackward() {
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68 // REMARK: can't use lower due to gwt bug
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69 // final Double prev = this.validSteps.lower(this.currentKm);
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70
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71 final SortedSet<Double> headSet = this.validSteps.headSet(this.currentKm);
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72 final Double prev = headSet.isEmpty() ? null : headSet.last();
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73
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74 if (prev != null)
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75 return prev;
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76
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77 return this.validSteps.first();
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78 }
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79
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80 @Override
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81 public double setValidCurrentKm(final double currentKm) {
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82 this.currentKm = calculateValidCurrentKm(currentKm);
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83 return this.currentKm;
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84 }
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85
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86 private double calculateValidCurrentKm(final double newKm) {
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87
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88 if (this.validSteps.contains(newKm)) {
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89 /* special case, and because headSet() is not inclusive */
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90 return newKm;
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91 }
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92
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93 final SortedSet<Double> headSet = this.validSteps.headSet(newKm);
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94 final SortedSet<Double> tailSet = this.validSteps.tailSet(newKm);
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95
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96 // REMARK: can't use floor/ceiling because of gwt bug
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97 // final Double floor = this.validSteps.floor(currentKm);
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98 // final Double ceiling = this.validSteps.ceiling(currentKm);
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99 final Double floor = headSet.isEmpty() ? null : headSet.last();
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100 final Double ceiling = tailSet.isEmpty() ? null : tailSet.first();
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101
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102 if (floor != null && ceiling == null)
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103 return floor;
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104
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105 if (floor == null && ceiling != null)
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106 return ceiling;
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107
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108 if (floor == null && ceiling == null) {
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109 /* should never happen as validKms is never empty */
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110 return this.currentKm;
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111 }
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112
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113 if (floor == null || ceiling == null) {
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114 /* will never happen, but makes the NullPointer access checker happy, else we get warnings in the folowing code */
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115 return this.currentKm;
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116 }
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117
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118 /* both not null; find nearest */
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119 final double floorDiff = Math.abs(newKm - floor);
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120 final double ceilingDiff = Math.abs(newKm - ceiling);
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121 if (floorDiff < ceilingDiff)
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122 return floor;
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123
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124 return ceiling;
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125 }
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126 }
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