/*
* 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.assembler.assemblers;
import org.apache.jena.assembler.Assembler ;
import org.apache.jena.assembler.JA ;
import org.apache.jena.assembler.Mode ;
import org.apache.jena.graph.Factory ;
import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.compose.MultiUnion ;
import org.apache.jena.rdf.model.Model ;
import org.apache.jena.rdf.model.ModelFactory ;
import org.apache.jena.rdf.model.Resource ;
import org.apache.jena.rdf.model.StmtIterator ;
public class UnionModelAssembler extends ModelAssembler implements Assembler
{
@Override
protected Model openEmptyModel( Assembler a, Resource root, Mode mode )
{
checkType( root, JA.UnionModel );
MultiUnion union = new MultiUnion();
union.addGraph( getRootModel( a, root, mode ) );
addSubModels( a, root, union, mode );
return ModelFactory.createModelForGraph( union );
}
private Graph getRootModel( Assembler a, Resource root, Mode mode )
{
Resource r = getUniqueResource( root, JA.rootModel );
return r == null ? Factory.empty() : a.openModel( r, mode ).getGraph();
}
private void addSubModels( Assembler a, Resource root, MultiUnion union, Mode mode )
{
for (StmtIterator it = root.listProperties( JA.subModel ); it.hasNext();)
{
Resource resource = getResource( it.nextStatement() );
union.addGraph( a.openModel( resource, mode ).getGraph() );
}
}
}