/**
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 Aug 19, 2010
*/
package com.bigdata.bop;
import com.bigdata.relation.rule.eval.IJoinNexus;
/**
* An interface for exposing the data in an object view of a tuple by index
* position. This facilitates binding values elements read from an access path
* onto binding sets during join processing.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*
* @see IPredicate#get(Object, int)
* @see IJoinNexus#bind(IPredicate, IConstraint, Object, IBindingSet)
*/
public interface IElement {
/**
* Return the value at the specified index.
*
* @param index
* The index.
*
* @return The value at the specified index.
*
* @throws IllegalArgumentException
* if the index is less than zero or GTE the #of fields defined
* for the element.
*/
public Object get(int index);
}