/*
* 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.tdb.solver;
import org.apache.jena.atlas.iterator.Filter ;
import org.apache.jena.atlas.lib.Tuple ;
import com.hp.hpl.jena.graph.Graph ;
import com.hp.hpl.jena.sparql.core.BasicPattern ;
import com.hp.hpl.jena.sparql.engine.ExecutionContext ;
import com.hp.hpl.jena.sparql.engine.QueryIterator ;
import com.hp.hpl.jena.sparql.engine.main.StageGenerator ;
import com.hp.hpl.jena.tdb.store.GraphTDB ;
import com.hp.hpl.jena.tdb.store.NodeId ;
/** Execute TDB requests directly -- no reordering
* Using OpExecutor is preferred.
*/
public class StageGeneratorDirectTDB implements StageGenerator
{
// Using OpExecutor is preferred.
StageGenerator above = null ;
public StageGeneratorDirectTDB(StageGenerator original)
{
above = original ;
}
@Override
public QueryIterator execute(BasicPattern pattern, QueryIterator input, ExecutionContext execCxt)
{
// --- In case this isn't for TDB
Graph g = execCxt.getActiveGraph() ;
if ( ! ( g instanceof GraphTDB ) )
// Not us - bounce up the StageGenerator chain
return above.execute(pattern, input, execCxt) ;
GraphTDB graph = (GraphTDB)g ;
Filter<Tuple<NodeId>> filter = QC2.getFilter(execCxt.getContext()) ;
return SolverLib.execute(graph, pattern, input, filter, execCxt) ;
}
}