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git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7523 6c8d7289-2bf4-0310-a012-ef5d649a1542
70 lines
2.5 KiB
Java
70 lines
2.5 KiB
Java
// MicroDate.java
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// (C) 2008 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 3.7.2008 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.kelondro.order;
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import java.util.Date;
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public class MicroDate {
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private static final long hour = 3600000L; // milliseconds of a hour
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private static final long day = 86400000L; // milliseconds of a day
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public static int microDateDays(final Date modified) {
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return microDateDays(modified.getTime());
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}
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public static int microDateDays(final long modified) {
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// this calculates a virtual age from a given date
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// the purpose is to have an age in days of a given modified date
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// from a fixed standpoint in the past
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// one day has 60*60*24 seconds = 86400 seconds
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// we take mod 64**3 = 262144, this is the mask of the storage
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return (int) ((modified / day) % 262144L);
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}
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public static String microDateHoursStr(final long time) {
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return Base64Order.enhancedCoder.encodeLongSB(microDateHoursInt(time), 3).toString();
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}
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public static int microDateHoursInt(final long time) {
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return (int) ((time / hour) % 262144L);
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}
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public static int microDateHoursAge(final String mdhs) {
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return microDateHoursInt(System.currentTimeMillis()) - (int) Base64Order.enhancedCoder.decodeLong(mdhs);
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}
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public static long reverseMicroDateDays(final long microDateDays) {
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return Math.min(System.currentTimeMillis(), microDateDays * day);
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}
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public static void main(final String[] args) {
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}
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}
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