/**
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 10, 2011
*/
package com.bigdata.rdf.lexicon;
import com.bigdata.bop.IPredicate;
/**
* Type safe enumeration of access patterns for the {@link LexPredicate}.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public enum LexAccessPatternEnum {
/** Only the IV position is bound. */
IVBound,
/** Only the Value position is bound. */
ValueBound,
/** Neither position is bound. */
NoneBound,
/** Both positions are bound. */
FullyBound;
static public LexAccessPatternEnum valueOf(final IPredicate<?> predicate) {
if (predicate.arity() != 2)
throw new IllegalArgumentException();
if (predicate.get(1/* IV */).isConstant()) {
if(predicate.get(0/* Value */).isConstant()) {
return FullyBound;
}
return IVBound;
} else if (predicate.get(0/* Value */).isConstant()) {
return ValueBound;
} else {
return NoneBound;
}
}
}