/*
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 org.openrdf.model.Literal;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.vocabulary.RDF;
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.BigdataURI;
import com.bigdata.rdf.model.BigdataValueFactory;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;
/**
* Return the datatype of the literal argument.
*/
public class DatatypeBOp extends IVValueExpression<IV>
implements INeedsMaterialization {
/**
*
*/
private static final long serialVersionUID = 7391999162162545704L;
private static final transient Logger log = Logger.getLogger(DatatypeBOp.class);
public DatatypeBOp(final IValueExpression<? extends IV> x, final GlobalAnnotations globals) {
this(new BOp[] { x }, anns(globals));
}
/**
* Required shallow copy constructor.
*/
public DatatypeBOp(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
if (args.length != 1 || args[0] == null)
throw new IllegalArgumentException();
if (getProperty(Annotations.NAMESPACE) == null)
throw new IllegalArgumentException();
}
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*/
public DatatypeBOp(final DatatypeBOp op) {
super(op);
}
public IV get(final IBindingSet bs) {
final BigdataValueFactory vf = super.getValueFactory();
@SuppressWarnings("rawtypes")
final IV iv = getAndCheckLiteral(0, bs);
// not yet bound
if (iv == null)
throw new SparqlTypeErrorException();
if (log.isDebugEnabled()) {
log.debug(iv);
}
/*
* We don't need to do this anymore. asValue(IV) does the right thing,
* it will let us work with the IV directly in the right cases. The
* BOps should no longer be doing this kind of logic directly.
*/
// if (iv.isInline() && !iv.isExtension()) {
//
// return asIV(iv.getDTE().getDatatypeURI(), bs);
//
// }
final Value val = asValue(iv);
if (val instanceof Literal) {
final Literal literal = (Literal) val;
final URI datatype;
if (literal.getDatatype() != null) {
// literal with datatype
datatype = literal.getDatatype();
} else if (literal.getLanguage() != null) {
// language-tag literal
datatype = RDF.LANGSTRING;
} else if (literal.getLanguage() == null) {
// simple literal
datatype = XSD.STRING;
} else {
throw new SparqlTypeErrorException();
}
return asIV(datatype, bs);
}
throw new SparqlTypeErrorException();
}
/**
* The DatatypeBOp can evaluate against unmaterialized inline numerics.
*/
public Requirement getRequirement() {
return INeedsMaterialization.Requirement.SOMETIMES;
}
}