com.mchange.v2.encounter.AbstractEncounterCounter Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.encounter;
import java.util.Map;
class AbstractEncounterCounter implements EncounterCounter
{
final static Long ONE = new Long(1);
Map m;
AbstractEncounterCounter(Map m)
{ this.m = m; }
/**
* @return how many times have I seen this object before?
*/
public long encounter(Object o)
{
Long oldLong = (Long) m.get(o);
Long newLong;
long out;
if (oldLong == null)
{
out = 0;
newLong = ONE;
}
else
{
out = oldLong.longValue();
newLong = new Long(out + 1);
}
m.put( o, newLong );
return out;
}
public long reset(Object o)
{
long out = encounter(o);
m.remove( o );
return out;
}
public void resetAll()
{ m.clear(); }
}