Mercurial > dive4elements > river
comparison flys-backend/src/main/java/org/dive4elements/river/utils/EpsilonComparator.java @ 5828:dfb26b03b179
Moved directories to org.dive4elements.river
| author | Sascha L. Teichmann <teichmann@intevation.de> |
|---|---|
| date | Thu, 25 Apr 2013 11:53:11 +0200 |
| parents | flys-backend/src/main/java/de/intevation/flys/utils/EpsilonComparator.java@ce6b9945bf8e |
| children | 18619c1e7c2a |
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| 5827:e308d4ecd35a | 5828:dfb26b03b179 |
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| 1 package de.intevation.flys.utils; | |
| 2 | |
| 3 import java.util.Comparator; | |
| 4 | |
| 5 /** Comparator with some tolerance (epsilon). */ | |
| 6 public class EpsilonComparator implements Comparator<Double> | |
| 7 { | |
| 8 public static final double EPSILON = 1e-4; | |
| 9 | |
| 10 /** Ready-made comparator with 1e-4 tolerance. */ | |
| 11 public static final EpsilonComparator CMP = new EpsilonComparator(EPSILON); | |
| 12 | |
| 13 private double epsilon; | |
| 14 | |
| 15 public EpsilonComparator(double epsilon) { | |
| 16 this.epsilon = epsilon; | |
| 17 } | |
| 18 | |
| 19 @Override | |
| 20 public int compare(Double a, Double b) { | |
| 21 double diff = a - b; | |
| 22 if (diff < -epsilon) return -1; | |
| 23 if (diff > epsilon) return +1; | |
| 24 return 0; | |
| 25 } | |
| 26 } | |
| 27 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |