Mercurial > dive4elements > river

annotate flys-backend/src/main/java/de/intevation/flys/utils/EpsilonComparator.java @ 4775:d9f1202cef78

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Do the pairing of FLYS and AFT discharge tables by the field 'ABFLUSSTAFEL.BFG_ID' in AFT and 'discharge_table.bfg_id' in FLYS. TODO: Create new column in discharge_tabel.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 05 Jan 2013 14:52:55 +0100
parents ce6b9945bf8e
children
rev   line source
4742
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4732
diff changeset
1 package de.intevation.flys.utils;
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7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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2
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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3 import java.util.Comparator;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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4
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Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4732
diff changeset
5 /** Comparator with some tolerance (epsilon). */
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7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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6 public class EpsilonComparator implements Comparator<Double>
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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7 {
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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8 public static final double EPSILON = 1e-4;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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9
4742
Felix Wolfsteller <felix.wolfsteller@intevation.de>
parents: 4732
diff changeset
10 /** Ready-made comparator with 1e-4 tolerance. */
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7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
11 public static final EpsilonComparator CMP = new EpsilonComparator(EPSILON);
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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12
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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13 private double epsilon;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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14
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
15 public EpsilonComparator(double epsilon) {
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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16 this.epsilon = epsilon;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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17 }
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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18
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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19 @Override
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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20 public int compare(Double a, Double b) {
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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21 double diff = a - b;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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22 if (diff < -epsilon) return -1;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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23 if (diff > epsilon) return +1;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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24 return 0;
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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25 }
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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26 }
7fdddc6ba296 Initial version of support files for TIMParser, comments and TODOs by Felix Wolfsteller, Code by Sascha Teichmann.
Sascha Teichmann <sascha.teichmann@intevation.de>
parents:
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27 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org