Mercurial > dive4elements > river
diff artifacts/src/main/java/org/dive4elements/river/utils/UniqueDateFormatter.java @ 6865:90f66b4fc34d
Factored our date formatter.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Mon, 19 Aug 2013 12:45:27 +0200 |
parents | |
children | 0a5239a1e46e |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/artifacts/src/main/java/org/dive4elements/river/utils/UniqueDateFormatter.java Mon Aug 19 12:45:27 2013 +0200 @@ -0,0 +1,59 @@ +/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde + * Software engineering by Intevation GmbH + * + * This file is Free Software under the GNU AGPL (>=v3) + * and comes with ABSOLUTELY NO WARRANTY! Check out the + * documentation coming with Dive4Elements River for details. + */ + +package org.dive4elements.river.utils; + +import java.text.DateFormat; +import java.util.Collection; +import java.util.Date; +import java.util.HashMap; +import java.util.Map; + +import org.apache.log4j.Logger; + +public class UniqueDateFormatter { + + private static Logger log = Logger.getLogger(UniqueDateFormatter.class); + + private DateFormat df; + private DateFormat lf; + private Map<String, int[]> collisions; + + public UniqueDateFormatter( + DateFormat df, + DateFormat lf, + Collection<Date> dates + ) { + this.df = df; + this.lf = lf; + collisions = build(dates); + } + + private Map<String, int []> build(Collection<Date> dates) { + Map<String, int []> collisions = new HashMap<String, int[]>(); + for (Date d: dates) { + String s = df.format(d); + int [] count = collisions.get(s); + if (count == null) { + collisions.put(s, count = new int[1]); + } + if (++count[0] > 1) { + log.debug("date collsion found: " + d); + } + } + return collisions; + } + + public String format(Date date) { + String s = df.format(date); + int [] count = collisions.get(s); + return count == null || count[0] < 2 + ? s + : lf.format(date); + } +}