Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/KMIndex.java @ 4031:e4e345d81a65

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issue889/2
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Thu, 04 Oct 2012 14:54:44 +0200
parents 0e8929d5e9e3
children 46511b4d8357
rev   line source
3013
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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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 :
http://dive4elements.wald.intevation.org