Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/utils/KMIndex.java @ 3195:e870d999ba0d
ChangeLog for last commit
flys-artifacts/trunk@4811 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Christian Lins <christian.lins@intevation.de> |
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date | Wed, 27 Jun 2012 14:52:05 +0000 |
parents | 0e8929d5e9e3 |
children | 46511b4d8357 |
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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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10 public class KMIndex<A> |
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11 implements Serializable, Iterable<KMIndex.Entry<A>> |
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12 { |
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13 public static final double EPSILON = 1e-4; |
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14 |
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15 public static class Entry<A> |
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16 implements Serializable, Comparable<Entry<A>> |
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17 { |
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18 protected double km; |
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19 protected A value; |
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20 |
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21 public Entry(double km) { |
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22 this.km = km; |
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23 } |
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24 |
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25 public Entry(double km, A value) { |
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26 this.km = km; |
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27 this.value = value; |
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28 } |
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29 |
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30 public double getKm() { |
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31 return km; |
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32 } |
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33 |
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34 public A getValue() { |
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35 return value; |
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36 } |
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37 |
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38 public void setValue(A value) { |
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39 this.value = value; |
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40 } |
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41 |
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42 @Override |
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43 public int compareTo(Entry<A> other) { |
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44 double diff = km - other.km; |
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45 if (diff < -EPSILON) return -1; |
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46 if (diff > +EPSILON) return +1; |
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47 return 0; |
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48 } |
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49 |
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50 public boolean epsilonEquals(double km) { |
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51 return Math.abs(this.km - km) < EPSILON; |
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52 } |
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53 } // class Entry |
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54 |
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55 |
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56 protected List<Entry<A>> entries; |
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57 |
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58 public KMIndex() { |
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59 this(10); |
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60 } |
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61 |
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62 public KMIndex(int capacity) { |
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63 entries = new ArrayList<Entry<A>>(capacity); |
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64 } |
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65 |
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66 public void add(double km, A value) { |
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67 entries.add(new Entry<A>(km, value)); |
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68 } |
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69 |
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70 public void sort() { |
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71 Collections.sort(entries); |
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72 } |
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73 |
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74 public Entry<A> search(double km) { |
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75 for (Entry<A> entry: entries) { |
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76 if (entry.epsilonEquals(km)) { |
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77 return entry; |
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78 } |
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79 } |
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80 return null; |
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81 } |
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82 |
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83 public Entry<A> binarySearch(double km) { |
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84 int index = Collections.binarySearch(entries, new Entry<A>(km)); |
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85 return index >= 0 ? entries.get(index) : null; |
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86 } |
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87 |
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88 public Iterator<Entry<A>> iterator() { |
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89 return entries.iterator(); |
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90 } |
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91 } |
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92 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |