/*
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
*/
/*
* Created on Sep 24, 2008
*/
package com.bigdata.bop.solutions;
import com.bigdata.bop.IValueExpression;
/**
* Default impl.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class SortOrder<E> implements ISortOrder<E> {
/**
*
*/
private static final long serialVersionUID = -669873421670514139L;
private final IValueExpression<E> expr;
private final boolean asc;
/**
* Either <code>ASC ( expr ) or DESC ( expr )</code>.
*/
@Override
public String toString() {
return (asc ? "ASC" : "DESC") + "(" + expr + ")";
}
/**
*
* @param expr
* The value expression.
* @param asc
* <code>true</code> for an ascending sort and
* <code>false</code> for a descending sort.
*/
public SortOrder(final IValueExpression<E> expr, final boolean asc) {
if (expr == null)
throw new IllegalArgumentException();
this.expr = expr;
this.asc = asc;
}
public IValueExpression<E> getExpr() {
return expr;
}
public boolean isAscending() {
return asc;
}
}