/*
* 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 com.hp.hpl.jena.rdf.model;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.graph.GraphExtract;
import com.hp.hpl.jena.graph.TripleBoundary;
/**
ModelExtract - a wrapper for GraphExtract, allowing rooted sub-models to be
extracted from other models with some boundary condition.
*/
public class ModelExtract
{
/**
The statement boundary used to bound the extraction.
*/
protected StatementBoundary boundary;
/**
Initialise this ModelExtract with a boundary condition.
*/
public ModelExtract( StatementBoundary b )
{ boundary = b; }
/**
Answer the rooted sub-model.
*/
public Model extract( Resource r, Model s )
{ return extractInto( ModelFactory.createDefaultModel(), r, s ); }
/**
Answer <code>model</code> after updating it with the sub-graph of
<code>s</code> rooted at <code>r</code>, bounded by this instances
<code>boundary</code>.
*/
public Model extractInto( Model model, Resource r, Model s )
{ TripleBoundary tb = boundary.asTripleBoundary( s );
Graph g = getGraphExtract( tb ) .extractInto( model.getGraph(), r.asNode(), s.getGraph() );
return ModelFactory.createModelForGraph( g ); }
/**
Answer a GraphExtract initialised with <code>tb</code>; extension point
for sub-classes (specifically TestModelExtract's mocks).
*/
protected GraphExtract getGraphExtract( TripleBoundary tb )
{ return new GraphExtract( tb ); }
}