/*
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 Jul 2, 2008
*/
package com.bigdata.relation.rule;
import java.io.Serializable;
/**
* An {@link IStep} is either a single {@link IRule} or a complex
* {@link IProgram}.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public interface IStep extends Serializable {
/**
* The name of the program.
*/
public String getName();
/**
* <code>true</code> iff the step is an {@link IRule} and
* <code>false</code> iff the step is an {@link IProgram}.
*/
public boolean isRule();
/**
* Return additional constraints that must be imposed during query
* evaluation.
*/
public IQueryOptions getQueryOptions();
/**
* A human readable representation of the {@link IStep}.
*/
public String toString();
}