Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/utils/UniqueDateFormatter.java @ 9801:1d7a72a50183 3.2.x tip

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Assume Compose V2, consistently
author Tom Gottfried <tom@intevation.de>
date Thu, 23 Nov 2023 10:14:13 +0100
parents 0a5239a1e46e
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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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0a5239a1e46e Upgrade to Log4j 2
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17 import org.apache.logging.log4j.Logger;
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18 import org.apache.logging.log4j.LogManager;
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19
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20 public class UniqueDateFormatter {
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21
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22 private static Logger log = LogManager.getLogger(UniqueDateFormatter.class);
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23
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24 private DateFormat df;
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25 private DateFormat lf;
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26 private Map<String, int[]> collisions;
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27
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28 public UniqueDateFormatter(
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29 DateFormat df,
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30 DateFormat lf,
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31 Collection<Date> dates
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32 ) {
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33 this.df = df;
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34 this.lf = lf;
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35 collisions = build(dates);
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36 }
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37
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38 private Map<String, int []> build(Collection<Date> dates) {
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39 Map<String, int []> collisions = new HashMap<String, int[]>();
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40 for (Date d: dates) {
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41 String s = df.format(d);
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42 int [] count = collisions.get(s);
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43 if (count == null) {
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44 collisions.put(s, count = new int[1]);
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45 }
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46 if (++count[0] > 1) {
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47 log.debug("date collsion found: " + d);
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48 }
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49 }
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50 return collisions;
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51 }
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52
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53 public String format(Date date) {
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54 String s = df.format(date);
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55 int [] count = collisions.get(s);
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56 return count == null || count[0] < 2
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57 ? s
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58 : lf.format(date);
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59 }
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60 }
http://dive4elements.wald.intevation.org