/**
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.rdf.spo;
import java.util.Comparator;
/**
* Imposes o:s:p ordering based on termIds only.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class OSPComparator implements Comparator<ISPO> {
public static final transient Comparator<ISPO> INSTANCE = new OSPComparator();
private OSPComparator() {
}
public int compare(final ISPO stmt1, final ISPO stmt2) {
if (stmt1 == stmt2)
return 0;
/*
* Note: logic avoids possible overflow of [long] by not computing the
* difference between two longs.
*/
int ret;
ret = stmt1.o().compareTo(stmt2.o());
if( ret == 0 ) {
ret = stmt1.s().compareTo(stmt2.s());
if( ret == 0 ) {
ret = stmt1.p().compareTo(stmt2.p());
}
}
return ret;
}
}