Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/utils/KMIndex.java @ 5377:a5f5599f6fd5 2.9.14
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author | Bettina Gruenbauer <bettina@intevation.de> |
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date | Fri, 22 Mar 2013 11:02:08 +0100 |
parents | 46511b4d8357 |
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rev | line source |
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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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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 : |