Mercurial > dive4elements > river
comparison flys-backend/src/main/java/de/intevation/flys/importer/ValueKey.java @ 503:bcc18293a547
Importer: Added unsharp lookup to avoid numerical problems.
flys-backend/trunk@1859 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Mon, 09 May 2011 10:04:23 +0000 |
| parents | 04d449f7f0c9 |
| children | 6dc847194625 |
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| 502:c6889097f81f | 503:bcc18293a547 |
|---|---|
| 1 package de.intevation.flys.importer; | 1 package de.intevation.flys.importer; |
| 2 | 2 |
| 3 import java.math.BigDecimal; | 3 import java.math.BigDecimal; |
| 4 | 4 |
| 5 import java.util.Comparator; | |
| 6 | |
| 5 public class ValueKey | 7 public class ValueKey |
| 6 { | 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 | |
| 7 protected BigDecimal a; | 31 protected BigDecimal a; |
| 8 protected BigDecimal b; | 32 protected BigDecimal b; |
| 9 | 33 |
| 10 public ValueKey() { | 34 public ValueKey() { |
| 11 } | 35 } |