/**
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.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Map;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import com.bigdata.bop.BOp;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.ImmutableBOp;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.sparql.ast.FilterNode;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;
/**
* Implements the now() operator.
*/
public class NowBOp extends IVValueExpression<IV> implements INeedsMaterialization{
/**
*
*/
private static final long serialVersionUID = 9136864442064392445L;
public interface Annotations extends ImmutableBOp.Annotations {
}
public NowBOp(final GlobalAnnotations globals) {
this(BOp.NOARGS, anns(globals));
}
/**
* Required shallow copy constructor.
*
* @param args
* The operands.
* @param op
* The operation.
*/
public NowBOp(final BOp[] args, Map<String, Object> anns) {
super(args, anns);
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*
* @param op
*/
public NowBOp(final NowBOp op) {
super(op);
}
final public IV get(final IBindingSet bs) {
final Calendar cal = Calendar.getInstance();
final Date now = cal.getTime();
final GregorianCalendar c = new GregorianCalendar();
c.setTime(now);
try {
final XMLGregorianCalendar date =
DatatypeFactory.newInstance().newXMLGregorianCalendar(c);
return super.asIV(getValueFactory().createLiteral(date), bs);
} catch (DatatypeConfigurationException e) {
throw new RuntimeException(e);
}
}
public String toString() {
return "now()";
}
public Requirement getRequirement() {
return Requirement.NEVER;
}
}