Mercurial > dive4elements > river

annotate backend/src/main/java/org/dive4elements/river/importer/ValueKey.java @ 5844:4dd33b86dc61

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Added header to river backend.
author Sascha L. Teichmann <teichmann@intevation.de>
date Fri, 26 Apr 2013 08:25:41 +0200
parents 5aa05a7a34b7
children 4c3ccf2b0304
rev   line source
5844
4dd33b86dc61 Added header to river backend.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.importer;
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10
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11 import java.math.BigDecimal;
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12
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13 import java.util.Comparator;
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14
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15 public class ValueKey
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16 {
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17 public static final double EPSILON = 1e-6;
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18
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19 public static final Comparator<ValueKey> EPSILON_COMPARATOR =
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20 new Comparator<ValueKey>()
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21 {
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22 public int compare(ValueKey x, ValueKey y) {
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23 int cmp = ValueKey.compare(x.a, y.a);
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24 if (cmp != 0) return cmp;
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25 return ValueKey.compare(x.b, y.b);
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26 }
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27 };
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28
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29 public static int compare(BigDecimal a, BigDecimal b) {
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30 if (a == null && b == null) return 0;
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31 if (a != null && b == null) return +1;
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32 if (a == null && b != null) return -1;
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33
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34 double diff = a.doubleValue() - b.doubleValue();
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35 if (diff < -EPSILON) return -1;
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36 return diff > EPSILON ? +1 : 0;
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37 }
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38
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39 protected BigDecimal a;
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40 protected BigDecimal b;
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41
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42 public ValueKey() {
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43 }
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44
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45 public ValueKey(BigDecimal a, BigDecimal b) {
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46 this.a = a;
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47 this.b = b;
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48 }
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49
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50 @Override
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51 public int hashCode() {
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52 return ((a != null ? a.hashCode() : 0) << 16)
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53 | (b != null ? b.hashCode() : 0);
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54 }
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55
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56 @Override
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57 public boolean equals(Object other) {
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58 if (!(other instanceof ValueKey)) {
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59 return false;
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60 }
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61 ValueKey o = (ValueKey)other;
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62 return !(
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63 (a == null && o.a != null)
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64 || (a != null && o.a == null)
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65 || (a != null && !a.equals(o.a))
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66 || (b == null && o.b != null)
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67 || (b != null && o.b == null)
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68 || (b != null && !b.equals(o.b)));
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69 }
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70 }
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71 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org