Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/KMIndex.java @ 3018:fb07f936b5ad

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New helper. flys-artifacts/trunk@4584 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Tue, 05 Jun 2012 13:28:11 +0000
parents ba62c1751f07
children 65b6e27c6f25
rev   line source
3013
ba62c1751f07 FixA: Added new serializable km inedx structure.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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
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7 import java.io.Serializable;
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8
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9 public class KMIndex<A>
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10 implements Serializable
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11 {
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12 public static final double EPSILON = 1e-4;
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13
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14 public static class Entry<A>
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15 implements Serializable, Comparable<Entry<A>>
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16 {
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17 protected double km;
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18 protected A value;
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19
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20 public Entry(double km) {
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21 this.km = km;
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22 }
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23
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24 public Entry(double km, A value) {
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25 this.km = km;
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26 this.value = value;
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27 }
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28
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29 public double getKm() {
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30 return km;
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31 }
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32
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33 public A getValue() {
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34 return value;
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35 }
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36
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37 public void setValue(A value) {
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38 this.value = value;
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39 }
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40
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41 @Override
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42 public int compareTo(Entry<A> other) {
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43 double diff = km - other.km;
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44 if (diff < -EPSILON) return -1;
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45 if (diff > +EPSILON) return +1;
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46 return 0;
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47 }
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48
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49 public boolean epsilonEquals(double km) {
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50 return Math.abs(this.km - km) < EPSILON;
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51 }
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52 } // class Entry
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53
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54
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55 protected List<Entry<A>> entries;
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56
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57 public KMIndex() {
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58 this(10);
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59 }
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60
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61 public KMIndex(int capacity) {
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62 entries = new ArrayList<Entry<A>>(capacity);
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63 }
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64
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65 public void add(double km, A value) {
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66 entries.add(new Entry(km, value));
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67 }
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68
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69 public void sort() {
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70 Collections.sort(entries);
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71 }
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72
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73 public Entry<A> search(double km) {
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74 for (Entry<A> entry: entries) {
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75 if (entry.epsilonEquals(km)) {
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76 return entry;
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77 }
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78 }
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79 return null;
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80 }
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81
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82 public Entry<A> binarySearch(double km) {
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83 int index = Collections.binarySearch(entries, new Entry(km));
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84 return index >= 0 ? entries.get(index) : null;
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85 }
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86 }
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87 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org