/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.service.ndx;
import com.bigdata.btree.proc.IResultHandler;
import com.bigdata.service.Split;
/**
* NOP aggregator does nothing and returns <code>null</code>. This is used for
* parallelizing operations that require a result handler to stripe them against
* the index.
*
* @author bryan
*
* @param <R>
* @param <A>
*
* @see BLZG-1537 (Schedule more IOs when loading data)
*/
public class NopAggregator<R, A> implements IResultHandler<R, A> {
@SuppressWarnings("rawtypes")
public static final IResultHandler INSTANCE = new NopAggregator();
public NopAggregator() {
}
@Override
public void aggregate(final R result, final Split split) {
// NOP
}
@Override
public A getResult() {
// NOP
return null;
}
}