/*
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 org.apache.log4j.Logger;
import com.bigdata.bop.BOp;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IValueExpression;
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;
/**
* Conditional if BOp
*/
public class IfBOp extends IVValueExpression<IV> implements IPassesMaterialization {
/**
*
*/
private static final long serialVersionUID = 7391999162162545704L;
private static final transient Logger log = Logger.getLogger(IfBOp.class);
@Override
protected boolean areGlobalsRequired() {
return false;
}
public IfBOp(final IValueExpression<? extends IV> conditional,//
final IValueExpression<? extends IV> expression1,//
final IValueExpression<? extends IV> expression2) {
this(new BOp[] { conditional,expression1,expression2 }, BOp.NOANNS);
}
/**
* Required shallow copy constructor.
*/
public IfBOp(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
if (args.length != 3 || args[0] == null|| args[1] == null|| args[2] == null)
throw new IllegalArgumentException();
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*/
public IfBOp(final IfBOp op) {
super(op);
}
public IV get(final IBindingSet bs) {
final IV iv = get(0).get(bs);
if(iv==null||!( iv instanceof XSDBooleanIV)){
throw new SparqlTypeErrorException();
}
if (((XSDBooleanIV) iv).getInlineValue()) {
final IV exp1 = get(1).get(bs);
if(exp1==null){
throw new SparqlTypeErrorException();
}
return exp1;
}else{
final IV exp2 = get(2).get(bs);
if(exp2==null){
throw new SparqlTypeErrorException();
}
return exp2;
}
}
}