/*
* 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.propertytable.graph;
import org.apache.jena.graph.Graph ;
import org.apache.jena.sparql.core.BasicPattern ;
import org.apache.jena.sparql.engine.ExecutionContext ;
import org.apache.jena.sparql.engine.QueryIterator ;
import org.apache.jena.sparql.engine.main.StageGenerator ;
/**
* The extension of StageGenerator for querying a Row.
*
*/
public class StageGeneratorPropertyTable implements StageGenerator {
// Using OpExecutor is preferred.
StageGenerator above = null ;
public StageGeneratorPropertyTable(StageGenerator original)
{
above = original ;
}
@Override
public QueryIterator execute(BasicPattern pattern, QueryIterator input, ExecutionContext execCxt)
{
// --- In case this isn't for GraphPropertyTable
Graph g = execCxt.getActiveGraph() ;
if ( ! ( g instanceof GraphPropertyTable ) )
return above.execute(pattern, input, execCxt) ;
if (pattern.size() <= 1){
return above.execute(pattern, input, execCxt) ;
}
return QueryIterPropertyTable.create(input, pattern, execCxt);
}
}