/**
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.openrdf.model.Literal;
import org.openrdf.model.URI;
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.XSD;
import com.bigdata.rdf.model.BigdataBNode;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;
/**
* The BNODE()/BNODE(Literal) function as defined in <a
* href="http://www.w3.org/TR/sparql11-query/#SparqlOps">SPARQL 1.1 Query
* Language for RDF</a>.
*
* @author <a href="mailto:mrpersonick@users.sourceforge.net">Mike Personick</a>
* @version $Id$
*/
public class BNodeBOp extends IVValueExpression<IV> implements INeedsMaterialization {
private static final long serialVersionUID = -8448763718374010166L;
public BNodeBOp(final GlobalAnnotations globals) {
super(globals);
}
public BNodeBOp(final IValueExpression<? extends IV> x,
final GlobalAnnotations globals) {
this(new BOp[] { x }, anns(globals));
}
public BNodeBOp(BOp[] args, Map<String, Object> anns) {
super(args, anns);
if (args.length != 1 || args[0] == null)
throw new IllegalArgumentException();
}
public BNodeBOp(BNodeBOp op) {
super(op);
}
public Requirement getRequirement() {
return Requirement.SOMETIMES;
}
public IV get(final IBindingSet bs) throws SparqlTypeErrorException {
if (arity() == 0) {
return super.asIV(getValueFactory().createBNode(), bs);
}
final Literal lit = getAndCheckLiteralValue(0, bs);
final URI dt = lit.getDatatype();
if (dt != null && !dt.stringValue().equals(XSD.STRING.stringValue()))
throw new SparqlTypeErrorException();
final BigdataBNode bnode = getValueFactory().createBNode(
"-bnode-func-" + lit.getLabel());
return super.asIV(bnode, bs);
}
}