Mercurial > dive4elements > river

annotate flys-backend/src/main/java/de/intevation/flys/importer/ValueKey.java @ 2380:e237a08acf6e

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Create fast cross section lines in the backend now. flys-backend/trunk@3696 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 17 Jan 2012 16:56:38 +0000
parents 6dc847194625
children
rev   line source
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1 package de.intevation.flys.importer;
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2
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3 import java.math.BigDecimal;
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4
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5 import java.util.Comparator;
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6
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7 public class ValueKey
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8 {
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9 public static final double EPSILON = 1e-6;
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10
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11 public static final Comparator<ValueKey> EPSILON_COMPARATOR =
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12 new Comparator<ValueKey>()
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13 {
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14 public int compare(ValueKey x, ValueKey y) {
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15 int cmp = ValueKey.compare(x.a, y.a);
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16 if (cmp != 0) return cmp;
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17 return ValueKey.compare(x.b, y.b);
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18 }
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19 };
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20
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21 public static int compare(BigDecimal a, BigDecimal b) {
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22 if (a == null && b == null) return 0;
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23 if (a != null && b == null) return +1;
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24 if (a == null && b != null) return -1;
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25
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26 double diff = a.doubleValue() - b.doubleValue();
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27 if (diff < -EPSILON) return -1;
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28 return diff > EPSILON ? +1 : 0;
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29 }
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30
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31 protected BigDecimal a;
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32 protected BigDecimal b;
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33
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34 public ValueKey() {
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35 }
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36
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37 public ValueKey(BigDecimal a, BigDecimal b) {
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38 this.a = a;
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39 this.b = b;
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40 }
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41
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42 @Override
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43 public int hashCode() {
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44 return ((a != null ? a.hashCode() : 0) << 16)
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45 | (b != null ? b.hashCode() : 0);
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46 }
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47
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48 @Override
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49 public boolean equals(Object other) {
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50 if (!(other instanceof ValueKey)) {
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51 return false;
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52 }
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53 ValueKey o = (ValueKey)other;
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54 return !(
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55 (a == null && o.a != null)
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56 || (a != null && o.a == null)
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57 || (a != null && !a.equals(o.a))
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58 || (b == null && o.b != null)
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59 || (b != null && o.b == null)
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60 || (b != null && !b.equals(o.b)));
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61 }
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62 }
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63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org