org.apache.jena.tdb.migrate.A2 Maven / Gradle / Ivy

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TDB is a storage subsystem for Jena and ARQ, it is a native triple store providing persistent storage of triples/quads.

There is a newer version: 4.10.0

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
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 * 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
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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 ;
    }
}