Mercurial > dive4elements > river
diff 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 |
line wrap: on
line diff
--- a/flys-backend/src/main/java/de/intevation/flys/importer/ValueKey.java Mon May 09 00:38:13 2011 +0000 +++ b/flys-backend/src/main/java/de/intevation/flys/importer/ValueKey.java Mon May 09 10:04:23 2011 +0000 @@ -2,8 +2,32 @@ import java.math.BigDecimal; +import java.util.Comparator; + public class ValueKey { + public static final double EPSILON = 1e-6; + + public static final Comparator<ValueKey> EPSILON_COMPARATOR = + new Comparator<ValueKey>() + { + public int compare(ValueKey x, ValueKey y) { + int cmp = ValueKey.compare(x.a, y.a); + if (cmp != 0) return cmp; + return ValueKey.compare(x.b, y.b); + } + }; + + public static int compare(BigDecimal a, BigDecimal b) { + if (a == null && b == null) return 0; + if (a != null && b == null) return +1; + if (a == null && b != null) return -1; + + double diff = a.doubleValue() - b.doubleValue(); + if (diff < -EPSILON) return -1; + return diff > EPSILON ? +1 : 0; + } + protected BigDecimal a; protected BigDecimal b;