/*
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
*/
package com.bigdata.rdf.internal.constraints;
import java.util.Map;
import com.bigdata.bop.BOp;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IValueExpression;
import com.bigdata.bop.NV;
import com.bigdata.rdf.error.SparqlTypeErrorException;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.internal.impl.literal.XSDBooleanIV;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;
/**
* Imposes the constraint <code>!x</code>. The operand of this operator must
* evaluate to a boolean. If the operand is not known to evaluate to a boolean,
* it is wrapped with an {@link EBVBOp}.
*/
public class NotBOp extends XSDBooleanIVValueExpression {
/**
*
*/
private static final long serialVersionUID = -5701967329003122236L;
public NotBOp(final IValueExpression<? extends IV> x) {
this(new BOp[] { wrap(x) }, BOp.NOANNS);
}
/**
* Required shallow copy constructor.
*/
public NotBOp(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
if (args.length != 1 || args[0] == null)
throw new IllegalArgumentException();
if (!(args[0] instanceof XSDBooleanIVValueExpression))
throw new IllegalArgumentException();
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*/
public NotBOp(final NotBOp op) {
super(op);
}
public boolean accept(final IBindingSet bs) {
final XSDBooleanIV iv = (XSDBooleanIV) get(0).get(bs);
// not yet bound
if (iv == null)
throw new SparqlTypeErrorException();
return !iv.booleanValue();
}
}