jena-core/src/test/java/org/apache/jena/testing_framework/AbstractModelProducer.java

/*
    Licensed to the Apache Software Foundation (ASF) under one
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    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
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        http://www.apache.org/licenses/LICENSE-2.0

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    distributed under the License is distributed on an "AS IS" BASIS,
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    See the License for the specific language governing permissions and
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 */
package org.apache.jena.testing_framework;

import java.util.ArrayList;
import java.util.List;

import org.xenei.junit.contract.IProducer;
import org.apache.jena.rdf.model.Model;

/**
 * An abstract implementation of the ModelProducerInterface.
 * 
 * This class handles tracking of the created models and closing them. It also
 * provides a callback for the implementing class to perform extra cleanup when
 * the model is closed.
 * 
 */
public abstract class AbstractModelProducer<T extends Model> implements
		IProducer<T> {

	/**
	 * The list of graphs that have been opened in this test.
	 */
	protected List<Model> modelList = new ArrayList<>();

	/**
	 * @return true if the models returned by this poducer are independent,
	 *         false otherwise.
	 * 
	 */
	abstract public boolean areIndependent();

	/**
	 * The method to create a new model.
	 * 
	 * @return a newly constructed model of type under test.
	 */
	abstract protected T createNewModel();

	@Override
	final public T newInstance() {
		T retval = createNewModel();
		modelList.add(retval);
		return retval;
	}

	/**
	 * Method called after the graph is closed. This allows the implementer to
	 * perform extra cleanup activities, like deleting the file associated with
	 * a file based graph.
	 * <p>
	 * By default this does nothing.
	 * </p>
	 * 
	 * @param g
	 *            The graph that is closed
	 */
	protected void afterClose(T g) {
	}

	@SuppressWarnings("unchecked")
    @Override
	final public void cleanUp() {
		for (Model m : modelList) {
			if (!m.isClosed()) {
				m.close();
			}
			afterClose((T) m);
		}
		modelList.clear();
	}
	
}