Mercurial > dive4elements > river
comparison artifacts/src/main/java/org/dive4elements/river/utils/UniqueDateFormatter.java @ 6865:90f66b4fc34d
Factored our date formatter.
| author | Sascha L. Teichmann <teichmann@intevation.de> |
|---|---|
| date | Mon, 19 Aug 2013 12:45:27 +0200 |
| parents | |
| children | 0a5239a1e46e |
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| 6864:b55111e13acd | 6865:90f66b4fc34d |
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| 1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde | |
| 2 * Software engineering by Intevation GmbH | |
| 3 * | |
| 4 * This file is Free Software under the GNU AGPL (>=v3) | |
| 5 * and comes with ABSOLUTELY NO WARRANTY! Check out the | |
| 6 * documentation coming with Dive4Elements River for details. | |
| 7 */ | |
| 8 | |
| 9 package org.dive4elements.river.utils; | |
| 10 | |
| 11 import java.text.DateFormat; | |
| 12 import java.util.Collection; | |
| 13 import java.util.Date; | |
| 14 import java.util.HashMap; | |
| 15 import java.util.Map; | |
| 16 | |
| 17 import org.apache.log4j.Logger; | |
| 18 | |
| 19 public class UniqueDateFormatter { | |
| 20 | |
| 21 private static Logger log = Logger.getLogger(UniqueDateFormatter.class); | |
| 22 | |
| 23 private DateFormat df; | |
| 24 private DateFormat lf; | |
| 25 private Map<String, int[]> collisions; | |
| 26 | |
| 27 public UniqueDateFormatter( | |
| 28 DateFormat df, | |
| 29 DateFormat lf, | |
| 30 Collection<Date> dates | |
| 31 ) { | |
| 32 this.df = df; | |
| 33 this.lf = lf; | |
| 34 collisions = build(dates); | |
| 35 } | |
| 36 | |
| 37 private Map<String, int []> build(Collection<Date> dates) { | |
| 38 Map<String, int []> collisions = new HashMap<String, int[]>(); | |
| 39 for (Date d: dates) { | |
| 40 String s = df.format(d); | |
| 41 int [] count = collisions.get(s); | |
| 42 if (count == null) { | |
| 43 collisions.put(s, count = new int[1]); | |
| 44 } | |
| 45 if (++count[0] > 1) { | |
| 46 log.debug("date collsion found: " + d); | |
| 47 } | |
| 48 } | |
| 49 return collisions; | |
| 50 } | |
| 51 | |
| 52 public String format(Date date) { | |
| 53 String s = df.format(date); | |
| 54 int [] count = collisions.get(s); | |
| 55 return count == null || count[0] < 2 | |
| 56 ? s | |
| 57 : lf.format(date); | |
| 58 } | |
| 59 } |