/*
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.rdf.internal.NotMaterializedException;
import com.bigdata.util.InnerCause;
/**
* Attempts to run a constraint prior to materialization. Returns
* <code>false</code> if it completes successfully without a
* {@link NotMaterializedException}, <code>true</code> otherwise.
*/
public class NeedsMaterializationBOp extends XSDBooleanIVValueExpression {
/**
*
*/
private static final long serialVersionUID = 4767476516948560884L;
// private static final transient Logger log = Logger
// .getLogger(NeedsMaterializationBOp.class);
public NeedsMaterializationBOp(final IValueExpression<?> x) {
this(new BOp[] { x }, BOp.NOANNS);
}
/**
* Required shallow copy constructor.
*/
public NeedsMaterializationBOp(final BOp[] args,
final Map<String, Object> anns) {
super(args, anns);
if (args.length != 1 || args[0] == null)
throw new IllegalArgumentException();
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*/
public NeedsMaterializationBOp(final NeedsMaterializationBOp op) {
super(op);
}
public boolean accept(final IBindingSet bs) {
final IValueExpression<?> ve = get(0);
try {
// if (log.isDebugEnabled()) {
// log.debug("about to attempt evaluation prior to materialization");
// }
ve.get(bs);
// if (log.isDebugEnabled()) {
// log.debug("successfully evaluated constraint without materialization");
// }
return false;
} catch (Throwable t) {
if (InnerCause.isInnerCause(t, NotMaterializedException.class)) {
// if (log.isDebugEnabled()) {
// log.debug("could not evaluate constraint without materialization");
// }
return true;
} else throw new RuntimeException(t);
}
}
}