/*
* 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 java.util.Iterator ;
import org.apache.jena.atlas.io.IndentedWriter ;
import org.apache.jena.atlas.iterator.Iter ;
import org.apache.jena.atlas.lib.Lib ;
import org.apache.jena.sparql.engine.ExecutionContext ;
import org.apache.jena.sparql.engine.binding.Binding ;
import org.apache.jena.sparql.serializer.SerializationContext ;
import org.apache.jena.util.iterator.NiceIterator ;
/** Turn an normal java.util.Iterator (of Bindings) into a QueryIterator */
public class QueryIterPlainWrapper extends QueryIter
{
Iterator<Binding> iterator = null ;
public QueryIterPlainWrapper(Iterator<Binding> iter)
{ this(iter, null) ; }
public QueryIterPlainWrapper(Iterator<Binding> iter, ExecutionContext context)
{
super(context) ;
iterator = iter ;
}
/** Preferrable to use a constructor - but sometimes that is inconvenient
* so pass null in the constructor and then call this before the iterator is
* used.
*/
public void setIterator(Iterator<Binding> iterator) { this.iterator = iterator ; }
@Override
protected boolean hasNextBinding() { return iterator.hasNext() ; }
@Override
protected Binding moveToNextBinding() { return iterator.next() ; }
@Override
protected void closeIterator()
{
if ( iterator != null )
{
NiceIterator.close(iterator) ;
// In case we wrapped, for example, another QueryIterator.
Iter.close(iterator) ;
iterator = null ;
}
}
@Override
protected void requestCancel()
{ }
@Override
public void output(IndentedWriter out, SerializationContext sCxt)
{ out.println(Lib.className(this)) ; }
}