/*
* 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.tdb.migrate;
import java.util.ArrayList;
import java.util.List;
import com.hp.hpl.jena.graph.Node;
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.iterator.QueryIterPlainWrapper;
import com.hp.hpl.jena.sparql.pfunction.PropFuncArg;
import com.hp.hpl.jena.sparql.pfunction.PropertyFunction;
/** A Property function that ignores it's arguments but reads and caches it's inputs */
public class CachingPF implements PropertyFunction
{
@Override
public void build(PropFuncArg argSubject, Node predicate, PropFuncArg argObject, ExecutionContext execCxt)
{}
//Override
@Override
public QueryIterator exec(QueryIterator input, PropFuncArg argSubject, Node predicate, PropFuncArg argObject,
ExecutionContext execCxt)
{
List<Binding> bindings = new ArrayList<>() ;
for ( ; input.hasNext() ; )
bindings.add(input.nextBinding()) ;
return new QueryIterPlainWrapper(bindings.iterator(), execCxt) ;
}
}