Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/utils/UniqueDateFormatter.java @ 6955:94cb1845c667

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(issue1452) Coalesce to zero to avoid NaN arithmetic.
author Andre Heinecke <aheinecke@intevation.de>
date Fri, 30 Aug 2013 15:45:14 +0200
parents 90f66b4fc34d
children 0a5239a1e46e
rev   line source
6865
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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.utils;
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10
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11 import java.text.DateFormat;
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12 import java.util.Collection;
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13 import java.util.Date;
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14 import java.util.HashMap;
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15 import java.util.Map;
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16
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17 import org.apache.log4j.Logger;
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18
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19 public class UniqueDateFormatter {
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20
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21 private static Logger log = Logger.getLogger(UniqueDateFormatter.class);
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22
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23 private DateFormat df;
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24 private DateFormat lf;
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25 private Map<String, int[]> collisions;
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26
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27 public UniqueDateFormatter(
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28 DateFormat df,
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29 DateFormat lf,
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30 Collection<Date> dates
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31 ) {
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32 this.df = df;
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33 this.lf = lf;
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34 collisions = build(dates);
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35 }
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36
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37 private Map<String, int []> build(Collection<Date> dates) {
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38 Map<String, int []> collisions = new HashMap<String, int[]>();
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39 for (Date d: dates) {
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40 String s = df.format(d);
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41 int [] count = collisions.get(s);
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42 if (count == null) {
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43 collisions.put(s, count = new int[1]);
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44 }
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45 if (++count[0] > 1) {
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46 log.debug("date collsion found: " + d);
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47 }
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48 }
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49 return collisions;
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50 }
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51
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52 public String format(Date date) {
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53 String s = df.format(date);
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54 int [] count = collisions.get(s);
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55 return count == null || count[0] < 2
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56 ? s
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57 : lf.format(date);
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58 }
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59 }
http://dive4elements.wald.intevation.org