| /** |
| * 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") ; |
| } |
| } |
| |