Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/UniqueDateFormatter.java @ 8951:322b0e6298ea
Work on SINFO FlowDepth-Development
author | gernotbelger |
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date | Fri, 16 Mar 2018 18:08:38 +0100 |
parents | 90f66b4fc34d |
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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 } |