/*
* 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.serializer.SerializationContext ;
/**
* This class supports a QueryIter that takes one QueryIterator as input. */
public abstract class QueryIter1 extends QueryIter
{
private QueryIterator input ;
public QueryIter1(QueryIterator input, ExecutionContext execCxt)
{
super(execCxt) ;
this.input = input ;
}
protected QueryIterator getInput() { return input ; }
@Override
protected final
void closeIterator()
{
closeSubIterator() ;
performClose(input) ;
input = null ;
}
@Override
protected final
void requestCancel()
{
requestSubCancel() ;
performRequestCancel(input) ;
}
/** Cancellation of the query execution is happening */
protected abstract void requestSubCancel() ;
/** Pass on the close method - no need to close the QueryIterator passed to the QueryIter1 constructor */
protected abstract void closeSubIterator() ;
// Do better
@Override
public void output(IndentedWriter out, SerializationContext sCxt)
{
// Linear form.
getInput().output(out, sCxt) ;
out.ensureStartOfLine() ;
details(out, sCxt) ;
out.ensureStartOfLine() ;
// details(out, sCxt) ;
// out.ensureStartOfLine() ;
// out.incIndent() ;
// getInput().output(out, sCxt) ;
// out.decIndent() ;
// out.ensureStartOfLine() ;
}
protected void details(IndentedWriter out, SerializationContext sCxt)
{
out.println(Lib.className(this)) ;
}
}