Mercurial > dive4elements > river
comparison backend/src/main/java/org/dive4elements/river/backend/utils/EpsilonComparator.java @ 8187:3bb1c62ad732
Moved package org.dive4elements.river.utils to org.dive4elements.river.backend.utils.
| author | Sascha L. Teichmann <teichmann@intevation.de> |
|---|---|
| date | Thu, 04 Sep 2014 15:03:25 +0200 |
| parents | backend/src/main/java/org/dive4elements/river/utils/EpsilonComparator.java@164e2f2c9bea |
| children |
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| 8186:a1ceacf15d3a | 8187:3bb1c62ad732 |
|---|---|
| 1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde | |
| 2 * Software engineering by Intevation GmbH | |
| 3 * | |
| 4 * This file is Free Software under the GNU AGPL (>=v3) | |
| 5 * and comes with ABSOLUTELY NO WARRANTY! Check out the | |
| 6 * documentation coming with Dive4Elements River for details. | |
| 7 */ | |
| 8 | |
| 9 package org.dive4elements.river.backend.utils; | |
| 10 | |
| 11 import java.util.Comparator; | |
| 12 import java.io.Serializable; | |
| 13 | |
| 14 /** Comparator with some tolerance (epsilon). */ | |
| 15 public class EpsilonComparator implements Comparator<Double>, Serializable | |
| 16 { | |
| 17 public static final double EPSILON = 1e-4; | |
| 18 | |
| 19 /** Ready-made comparator with 1e-4 tolerance. */ | |
| 20 public static final EpsilonComparator CMP = new EpsilonComparator(EPSILON); | |
| 21 | |
| 22 private double epsilon; | |
| 23 | |
| 24 public EpsilonComparator(double epsilon) { | |
| 25 this.epsilon = epsilon; | |
| 26 } | |
| 27 | |
| 28 @Override | |
| 29 public int compare(Double a, Double b) { | |
| 30 double diff = a - b; | |
| 31 if (diff < -epsilon) return -1; | |
| 32 if (diff > epsilon) return +1; | |
| 33 return 0; | |
| 34 } | |
| 35 } | |
| 36 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |