/*
* 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 org.apache.jena.sparql.engine.iterator;
import org.apache.jena.atlas.io.IndentedWriter ;
import org.apache.jena.atlas.lib.Lib ;
import org.apache.jena.sparql.engine.ExecutionContext ;
import org.apache.jena.sparql.engine.QueryIterator ;
import org.apache.jena.sparql.engine.binding.Binding ;
import org.apache.jena.sparql.serializer.SerializationContext ;
/** Iterator over another QueryIterator, applying a converter function
* to each object that is returned by .next() */
public class QueryIterConvert extends QueryIter1
{
public interface Converter
{
public Binding convert(Binding obj) ;
}
Converter converter ;
public QueryIterConvert(QueryIterator iter, Converter c, ExecutionContext context)
{
super(iter, context) ;
converter = c ;
}
@Override
protected void
closeSubIterator() {}
@Override
protected void
requestSubCancel() {}
@Override
public boolean hasNextBinding()
{
return getInput().hasNext() ;
}
@Override
public Binding moveToNextBinding()
{
return converter.convert(getInput().nextBinding()) ;
}
@Override
protected void details(IndentedWriter out, SerializationContext cxt)
{
out.println(Lib.className(this)) ;
}
}