/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sparql.pfunction.library;
import com.hp.hpl.jena.graph.Node ;
import com.hp.hpl.jena.query.ARQ ;
import com.hp.hpl.jena.sparql.core.Var ;
import com.hp.hpl.jena.sparql.engine.ExecutionContext ;
import com.hp.hpl.jena.sparql.engine.QueryIterator ;
import com.hp.hpl.jena.sparql.engine.binding.Binding ;
import com.hp.hpl.jena.sparql.engine.binding.BindingFactory ;
import com.hp.hpl.jena.sparql.engine.binding.BindingMap ;
import com.hp.hpl.jena.sparql.expr.NodeValue ;
import com.hp.hpl.jena.sparql.pfunction.PropFuncArg ;
import com.hp.hpl.jena.sparql.pfunction.PropFuncArgType ;
import com.hp.hpl.jena.sparql.pfunction.PropertyFunctionEval ;
import com.hp.hpl.jena.sparql.util.IterLib ;
public class versionARQ extends PropertyFunctionEval
{
static String versionStr = ARQ.VERSION ; // X.Y.Z
static Node version = NodeValue.makeString(versionStr).asNode() ;
static Node arq = Node.createURI(ARQ.arqIRI) ;
public versionARQ()
{ super(PropFuncArgType.PF_ARG_SINGLE, PropFuncArgType.PF_ARG_SINGLE) ; }
@Override
public QueryIterator execEvaluated(Binding binding, PropFuncArg subject, Node predicate, PropFuncArg object, ExecutionContext execCxt)
{
BindingMap b = BindingFactory.create(binding) ;
Node subj = subject.getArg() ;
if ( ! isSameOrVar(subj, arq) ) IterLib.noResults(execCxt) ;
if ( subj.isVariable() )
b.add(Var.alloc(subj), arq) ;
Node obj = object.getArg() ;
if ( ! isSameOrVar(obj, version) ) IterLib.noResults(execCxt) ;
if ( obj.isVariable() )
b.add(Var.alloc(obj), version) ;
return IterLib.result(b, execCxt) ;
}
private boolean isSameOrVar(Node var, Node value)
{
return var.isVariable() || var.equals(value) ;
}
}