/*
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.IVariable;
import com.bigdata.bop.NV;
import com.bigdata.rdf.error.SparqlTypeErrorException;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.model.BigdataValue;
/**
* Imposes the constraint <code>isMaterialized(x)</code>.
*/
public class IsMaterializedBOp extends XSDBooleanIVValueExpression {
/**
*
*/
private static final long serialVersionUID = -7552628930845996572L;
private static final transient Logger log = Logger
.getLogger(IsMaterializedBOp.class);
public interface Annotations extends XSDBooleanIVValueExpression.Annotations {
/**
* If <code>true</code>, only accept variable bindings for
* <code>x</code> that have a materialized RDF {@link BigdataValue}. If
* <code>false</code>, only accept those that don't.
*/
String MATERIALIZED = IsMaterializedBOp.class.getName() + ".materialized";
}
/**
*
* @param x
* The variable.
* @param materialized
* If <code>true</code>, only accept variable bindings for
* <code>x</code> that have a materialized RDF
* {@link BigdataValue}. If <code>false</code>, only accept those
* that don't.
* @param lex
* The namespace of the lexicon relation.
*/
public IsMaterializedBOp(final IVariable<IV> x, final boolean materialized) {
this(new BOp[] { x }, NV.asMap(Annotations.MATERIALIZED, materialized));
}
/**
* Required shallow copy constructor.
*/
public IsMaterializedBOp(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
if (args.length != 1 || args[0] == null)
throw new IllegalArgumentException();
if (getProperty(Annotations.MATERIALIZED) == null)
throw new IllegalArgumentException();
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*/
public IsMaterializedBOp(final IsMaterializedBOp op) {
super(op);
}
public boolean accept(final IBindingSet bs) {
final boolean materialized =
(Boolean) getRequiredProperty(Annotations.MATERIALIZED);
final IV<?,?> iv = get(0).get(bs);
if (log.isDebugEnabled()) {
log.debug(iv);
if (iv != null)
log.debug("materialized?: " + iv.hasValue());
}
// not yet bound
if (iv == null)
throw new SparqlTypeErrorException();
return iv.hasValue() == materialized || !iv.needsMaterialization();
}
}