/*
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 com.bigdata.bop.BOp;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IValueExpression;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.model.BigdataLiteral;
import com.bigdata.rdf.model.BigdataValueFactory;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;
/**
* <pre>http://www.w3.org/2005/xpath-functions#lower-case</pre>
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class LcaseBOp extends IVValueExpression<IV> implements INeedsMaterialization {
private static final long serialVersionUID = -6847688419473046477L;
public LcaseBOp(final IValueExpression<? extends IV> x, final GlobalAnnotations globals) {
super(x, globals);
}
/**
* Required shallow copy constructor.
*
* @param args
* The function arguments (value expressions).
* @param anns
* The function annotations.
*/
public LcaseBOp(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
if (args.length != 1 || args[0] == null) {
/*
* There must be exactly one argument for this function.
*/
throw new IllegalArgumentException();
}
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*
* @param op
*/
public LcaseBOp(final LcaseBOp op) {
super(op);
}
/**
* This is a {@link Requirement#SOMETIMES} because it can operate on inline
* {@link IV}s without materialization but requires materialization of
* non-inline {@link IV}s.
*/
@Override
public Requirement getRequirement() {
return Requirement.SOMETIMES;
}
@Override
public IV get(final IBindingSet bs) {
final Literal in = getAndCheckLiteralValue(0, bs);
final BigdataValueFactory vf = getValueFactory();
final String label = in.getLabel().toLowerCase();
final BigdataLiteral out;
if (in.getLanguage() != null) {
out = vf.createLiteral(label, in.getLanguage());
} else if (in.getDatatype() != null) {
out = vf.createLiteral(label, in.getDatatype());
} else {
out = vf.createLiteral(label);
}
return super.asIV(out, bs);
}
}