/*
* 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.NoSuchElementException ;
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.binding.Binding ;
import org.apache.jena.sparql.serializer.SerializationContext ;
/** A query iterator that yields the same thing N times. */
public class QueryIterYieldN extends QueryIter
{
protected int limitYielded ;
protected int countYielded = 0 ;
protected Binding binding ;
public QueryIterYieldN(int num, Binding b)
{
this(num, b, null) ;
}
public QueryIterYieldN(int num, Binding b, ExecutionContext context)
{
super(context) ;
binding = b ;
limitYielded = num ;
}
public Binding getBinding() { return binding ; }
@Override
protected boolean hasNextBinding()
{
return countYielded < limitYielded ;
}
@Override
protected Binding moveToNextBinding()
{
if ( ! hasNextBinding() )
// Try to get the class name as specific as possible for subclasses
throw new NoSuchElementException(Lib.className(this)) ;
countYielded++ ;
return binding ;
}
@Override
protected void closeIterator()
{
//binding = null ;
}
@Override
protected void requestCancel()
{
}
@Override
public void output(IndentedWriter out, SerializationContext sCxt)
{
out.print("QueryIterYieldN: "+limitYielded+" of "+binding);
}
}