Mercurial > dive4elements > river
comparison flys-backend/src/main/java/de/intevation/flys/importer/ValueKey.java @ 3471:e4250c6e1538 2.8.1
merged flys-backend/2.8.1
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:40 +0200 |
| parents | 6dc847194625 |
| children |
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| 3468:f37e7e8907cb | 3471:e4250c6e1538 |
|---|---|
| 1 package de.intevation.flys.importer; | |
| 2 | |
| 3 import java.math.BigDecimal; | |
| 4 | |
| 5 import java.util.Comparator; | |
| 6 | |
| 7 public class ValueKey | |
| 8 { | |
| 9 public static final double EPSILON = 1e-6; | |
| 10 | |
| 11 public static final Comparator<ValueKey> EPSILON_COMPARATOR = | |
| 12 new Comparator<ValueKey>() | |
| 13 { | |
| 14 public int compare(ValueKey x, ValueKey y) { | |
| 15 int cmp = ValueKey.compare(x.a, y.a); | |
| 16 if (cmp != 0) return cmp; | |
| 17 return ValueKey.compare(x.b, y.b); | |
| 18 } | |
| 19 }; | |
| 20 | |
| 21 public static int compare(BigDecimal a, BigDecimal b) { | |
| 22 if (a == null && b == null) return 0; | |
| 23 if (a != null && b == null) return +1; | |
| 24 if (a == null && b != null) return -1; | |
| 25 | |
| 26 double diff = a.doubleValue() - b.doubleValue(); | |
| 27 if (diff < -EPSILON) return -1; | |
| 28 return diff > EPSILON ? +1 : 0; | |
| 29 } | |
| 30 | |
| 31 protected BigDecimal a; | |
| 32 protected BigDecimal b; | |
| 33 | |
| 34 public ValueKey() { | |
| 35 } | |
| 36 | |
| 37 public ValueKey(BigDecimal a, BigDecimal b) { | |
| 38 this.a = a; | |
| 39 this.b = b; | |
| 40 } | |
| 41 | |
| 42 @Override | |
| 43 public int hashCode() { | |
| 44 return ((a != null ? a.hashCode() : 0) << 16) | |
| 45 | (b != null ? b.hashCode() : 0); | |
| 46 } | |
| 47 | |
| 48 @Override | |
| 49 public boolean equals(Object other) { | |
| 50 if (!(other instanceof ValueKey)) { | |
| 51 return false; | |
| 52 } | |
| 53 ValueKey o = (ValueKey)other; | |
| 54 return !( | |
| 55 (a == null && o.a != null) | |
| 56 || (a != null && o.a == null) | |
| 57 || (a != null && !a.equals(o.a)) | |
| 58 || (b == null && o.b != null) | |
| 59 || (b != null && o.b == null) | |
| 60 || (b != null && !b.equals(o.b))); | |
| 61 } | |
| 62 } | |
| 63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |