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/**
* 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 arq.examples.bgpmatching;
import org.apache.jena.sparql.ARQNotImplemented ;
import org.apache.jena.sparql.algebra.op.OpBGP ;
import org.apache.jena.sparql.algebra.op.OpDatasetNames ;
import org.apache.jena.sparql.algebra.op.OpQuadPattern ;
import org.apache.jena.sparql.engine.ExecutionContext ;
import org.apache.jena.sparql.engine.QueryIterator ;
import org.apache.jena.sparql.engine.main.OpExecutor ;
import org.apache.jena.sparql.engine.main.OpExecutorFactory ;
/** Example of an alternative OpExecutor */
public class OpExecutorAlt extends OpExecutor {
public static OpExecutorFactory factory = new OpExecutorFactory() {
@Override
public OpExecutor create(ExecutionContext execCxt) {
return new OpExecutorAlt(execCxt) ;
}} ;
public OpExecutorAlt(ExecutionContext execCxt) {
super(execCxt) ;
}
// The two places where we touch the storage, dpeneding on whether this is a
// triple or a quad based execution.
@Override
protected QueryIterator execute(OpBGP opBGP, QueryIterator input) {
return super.execute(opBGP, input) ;
}
// Default OpQuadPattern execution is a loop and it will call back into
// execute(OpBGP, QueryIterator)
@Override
protected QueryIterator execute(OpQuadPattern opQuadPattern, QueryIterator input) {
return super.execute(opQuadPattern, input) ;
}
// Quad form, "GRAPH ?g {}"
// Flip back to OpGraph.
// Not needed for triples-based execution
// Normally quad stores override this.
@Override
protected QueryIterator execute(OpDatasetNames dsNames, QueryIterator input) {
throw new ARQNotImplemented("execute/OpDatasetNames") ;
}
}