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 |
comparison
equal
deleted
inserted
replaced
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 : |