/*
* 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.tdb.migrate;
import org.apache.jena.sparql.algebra.Op ;
import org.apache.jena.sparql.algebra.Transform ;
import org.apache.jena.sparql.algebra.Transformer ;
import org.apache.jena.sparql.core.Quad ;
public class A2
{
/** Convert a pattern, assumed to be quad form,
* so that the default graph is the union of named graphs.
*/
public static Op unionDefaultGraphQuads(Op op)
{
// Rewrite so that any explicitly named "default graph" is union graph.
Transform t = new TransformGraphRename(Quad.defaultGraphNodeGenerated, Quad.unionGraph) ;
op = Transformer.transform(t, op) ;
return op ;
}
}