/*
* 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.sparql.engine.iterator;
import java.util.List ;
import org.openjena.atlas.io.IndentedWriter ;
import org.openjena.atlas.lib.ListUtils ;
import com.hp.hpl.jena.sparql.core.Var ;
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.binding.BindingProject ;
import com.hp.hpl.jena.sparql.serializer.SerializationContext ;
import com.hp.hpl.jena.sparql.util.Utils ;
public class QueryIterProject extends QueryIterConvert
{
List<Var> projectionVars ;
public QueryIterProject(QueryIterator input, List<Var> vars, ExecutionContext qCxt)
{
super(input, project(vars, qCxt), qCxt) ;
projectionVars = vars ;
}
static QueryIterConvert.Converter project(List<Var> vars, ExecutionContext qCxt)
{
return new Projection(vars, qCxt) ;
}
public List<Var> getProjectionVars() { return projectionVars ; }
@Override
protected void details(IndentedWriter out, SerializationContext sCxt)
{
out.print(Utils.className(this)) ;
out.print(" ") ;
ListUtils.print(out, projectionVars) ;
}
static
class Projection implements QueryIterConvert.Converter
{
List<Var> projectionVars ;
Projection(List<Var> vars, ExecutionContext qCxt)
{
this.projectionVars = vars ;
}
@Override
public Binding convert(Binding bind)
{
return new BindingProject(projectionVars, bind) ;
}
}
}