/*
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 Jun 19, 2008
*/
package com.bigdata.bop;
import java.io.Serializable;
/**
* An interface for specifying constraints on the allowable states of an
* {@link IBindingSet}. For example, you can impose the constraint that two
* variables must have distinct bindings the constraint that a binding must be
* (or must not be) a particular value type, or that the binding must take on
* one of a set of enumerated values.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public interface IConstraint extends BOp, Serializable {
/**
* Return <code>true</code> if the binding set satisfies the constraint.
*
* @param bindingSet
* The binding set.
*
* @todo rename as eval(IBindingSet)?
*/
public boolean accept(IBindingSet bindingSet);
/**
* A zero length empty {@link IConstraint} array.
*/
public IConstraint[] EMPTY = new IConstraint[0];
}