/*
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.Value;
import org.openrdf.query.algebra.evaluation.ValueExprEvaluationException;
import org.openrdf.query.algebra.evaluation.function.Function;
import org.openrdf.query.algebra.evaluation.function.FunctionRegistry;
import com.bigdata.bop.BOp;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IValueExpression;
import com.bigdata.bop.NV;
import com.bigdata.rdf.error.SparqlTypeErrorException;
import com.bigdata.rdf.internal.IV;
import com.bigdata.rdf.internal.NotMaterializedException;
import com.bigdata.rdf.model.BigdataValueFactory;
import com.bigdata.rdf.sparql.ast.GlobalAnnotations;
/**
* Call one of the Sesame casting functions.
*/
public class FuncBOp extends IVValueExpression<IV> implements
INeedsMaterialization {
/**
*
*/
private static final long serialVersionUID = 2587499644967260639L;
private static final transient Logger log = Logger.getLogger(FuncBOp.class);
public interface Annotations extends IVValueExpression.Annotations {
String FUNCTION = FuncBOp.class.getName() + ".function";
}
@SuppressWarnings("rawtypes")
public FuncBOp(final IValueExpression<? extends IV>[] args,
final String func, final GlobalAnnotations globals) {
this(args, anns(globals, new NV(Annotations.FUNCTION, func)));
}
/**
* Required shallow copy constructor.
*/
public FuncBOp(final BOp[] args, final Map<String, Object> anns) {
super(args, anns);
if (getProperty(Annotations.NAMESPACE) == null)
throw new IllegalArgumentException();
if (getProperty(Annotations.FUNCTION) == null)
throw new IllegalArgumentException();
}
private Function getFunc() {
if (funct == null) {
final String funcName = (String) getRequiredProperty(Annotations.FUNCTION);
funct = FunctionRegistry.getInstance().get(funcName);
if (funct == null) {
throw new RuntimeException("Unknown function '" + funcName
+ "'");
}
}
return funct;
}
private transient volatile Function funct;
/**
* Constructor required for {@link com.bigdata.bop.BOpUtility#deepCopy(FilterNode)}.
*/
public FuncBOp(final FuncBOp op) {
super(op);
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public IV get(final IBindingSet bs) {
final Value[] vals = new Value[arity()];
for (int i = 0; i < vals.length; i++) {
final IV<?,?> iv = getAndCheckBound(i, bs);
final Value val = asValue(iv);
if (log.isDebugEnabled()) {
log.debug("iv: " + iv + ", class="+iv.getClass());
log.debug("val: " + val + ", class="+val.getClass());
}
vals[i] = val;
}
final Function func = getFunc();
final BigdataValueFactory vf = getValueFactory();
try {
final Value val = func.evaluate(vf, vals);
final IV iv = asIV(val, bs);
if (log.isDebugEnabled()) {
log.debug("val: " + val + ", class="+val.getClass());
log.debug("iv: " + iv + ", class="+iv.getClass());
}
return iv;
} catch (ValueExprEvaluationException ex) {
throw new SparqlTypeErrorException();
}
}
/**
* This bop can only work with materialized terms.
*/
public Requirement getRequirement() {
return INeedsMaterialization.Requirement.SOMETIMES;
}
}