Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/KMIndex.java @ 5649:066f3a2f34d6

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Minor refactoring.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 10 Apr 2013 13:11:45 +0200
parents 46511b4d8357
children
rev   line source
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ba62c1751f07 FixA: Added new serializable km inedx structure.
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1 package de.intevation.flys.utils;
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2
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3 import java.util.ArrayList;
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4 import java.util.Collections;
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5 import java.util.List;
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6 import java.util.Iterator;
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7
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8 import java.io.Serializable;
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9
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46511b4d8357 KMIndex: Minor doc.
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10 /** km to value, searchable. Tolerance is at 10cm. */
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11 public class KMIndex<A>
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12 implements Serializable, Iterable<KMIndex.Entry<A>>
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13 {
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14 public static final double EPSILON = 1e-4;
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15
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16 public static class Entry<A>
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17 implements Serializable, Comparable<Entry<A>>
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18 {
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19 protected double km;
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20 protected A value;
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21
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22 public Entry(double km) {
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23 this.km = km;
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24 }
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25
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26 public Entry(double km, A value) {
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27 this.km = km;
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28 this.value = value;
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29 }
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30
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31 public double getKm() {
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32 return km;
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33 }
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34
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35 public A getValue() {
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36 return value;
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37 }
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38
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39 public void setValue(A value) {
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40 this.value = value;
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41 }
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42
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43 @Override
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44 public int compareTo(Entry<A> other) {
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45 double diff = km - other.km;
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46 if (diff < -EPSILON) return -1;
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47 if (diff > +EPSILON) return +1;
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48 return 0;
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49 }
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50
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51 public boolean epsilonEquals(double km) {
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52 return Math.abs(this.km - km) < EPSILON;
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53 }
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54 } // class Entry
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55
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56
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57 protected List<Entry<A>> entries;
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58
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59 public KMIndex() {
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60 this(10);
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61 }
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62
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63 public KMIndex(int capacity) {
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64 entries = new ArrayList<Entry<A>>(capacity);
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65 }
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66
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67 public void add(double km, A value) {
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68 entries.add(new Entry<A>(km, value));
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69 }
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70
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71 public void sort() {
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72 Collections.sort(entries);
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73 }
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74
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75 public Entry<A> search(double km) {
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76 for (Entry<A> entry: entries) {
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77 if (entry.epsilonEquals(km)) {
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78 return entry;
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79 }
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80 }
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81 return null;
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82 }
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83
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84 public Entry<A> binarySearch(double km) {
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85 int index = Collections.binarySearch(entries, new Entry<A>(km));
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86 return index >= 0 ? entries.get(index) : null;
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87 }
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88
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89 public Iterator<Entry<A>> iterator() {
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90 return entries.iterator();
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91 }
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92 }
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93 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org