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Stackable Sail implementation that adds RDF Schema inferencing to an RDF store.

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/* 
 * Licensed to Aduna under one or more contributor license agreements.  
 * See the NOTICE.txt file distributed with this work for additional 
 * information regarding copyright ownership. 
 *
 * Aduna licenses this file to you under the terms of the Aduna BSD 
 * License (the "License"); you may not use this file except in compliance 
 * with the License. See the LICENSE.txt file distributed with this work 
 * for the full License.
 *
 * 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.openrdf.sail.inferencer.fc;

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

import org.openrdf.IsolationLevel;
import org.openrdf.IsolationLevels;
import org.openrdf.sail.NotifyingSail;
import org.openrdf.sail.helpers.NotifyingSailWrapper;

public abstract class AbstractForwardChainingInferencer extends NotifyingSailWrapper {

	private static final IsolationLevels READ_COMMITTED = IsolationLevels.READ_COMMITTED;

	/*--------------*
	 * Constructors *
	 *--------------*/

	public AbstractForwardChainingInferencer() {
		super();
	}

	public AbstractForwardChainingInferencer(NotifyingSail baseSail) {
		super(baseSail);
	}

	/*---------*
	 * Methods *
	 *---------*/

	@Override
	public IsolationLevel getDefaultIsolationLevel() {
		IsolationLevel level = super.getDefaultIsolationLevel();
		if (level.isCompatibleWith(READ_COMMITTED)) {
			return level;
		} else {
			List supported = this.getSupportedIsolationLevels();
			return IsolationLevels.getCompatibleIsolationLevel(READ_COMMITTED, supported);
		}
	}

	@Override
	public List getSupportedIsolationLevels() {
		List supported = super.getSupportedIsolationLevels();
		List levels = new ArrayList(supported.size());
		for (IsolationLevel level : supported) {
			if (level.isCompatibleWith(READ_COMMITTED)) {
				levels.add(level);
			}
		}
		return levels;
	}
}