org.semanticweb.elk.reasoner.taxonomy.impl.AbstractDistinctBottomTaxonomy Maven / Gradle / Ivy

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/*
 * #%L
 * ELK Reasoner
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2016 Department of Computer Science, University of Oxford
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 * Licensed 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
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package org.semanticweb.elk.reasoner.taxonomy.impl;

import java.util.Set;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicInteger;

import org.semanticweb.elk.owl.interfaces.ElkEntity;
import org.semanticweb.elk.reasoner.taxonomy.model.GenericTaxonomyNode;
import org.semanticweb.elk.reasoner.taxonomy.model.UpdateableTaxonomy;

/**
 * An abstract taxonomy that stores unsatisfiable classes in different way than
 * other classes.
 * 
 * Nodes stored in this taxonomy need to access some of its fields, thus the
 * package visibility.
 * 
 * @author Peter Skocovsky
 *
 * @param 
 *            The type of members of the nodes in this taxonomy.
 * @param 
 *            The immutable type of nodes in this taxonomy.
 * @param 
 *            The mutable type of nodes in this taxonomy.
 */
public abstract class AbstractDistinctBottomTaxonomy<
				T extends ElkEntity,
				N extends GenericTaxonomyNode,
				UN extends UpdateableTaxonomyNode
		> extends AbstractTaxonomy implements UpdateableTaxonomy {

	/** Thread safe set of unsatisfiable classes. */
	final ConcurrentMap unsatisfiableClasses_;

	/** The number of nodes which have non-bottom sub-classes. */
	final AtomicInteger countNodesWithSubClasses_;

	public AbstractDistinctBottomTaxonomy() {
		this.unsatisfiableClasses_ = new ConcurrentHashMap();
		this.countNodesWithSubClasses_ = new AtomicInteger(0);
	}

	@Override
	public abstract N getBottomNode();

	@Override
	public abstract Set getNonBottomNodes();

	/**
	 * Returns the supplied set of mutable nodes as a set of immutable nodes.
	 * 
	 * @param nodes
	 *            The set of mutable nodes that should be returned.
	 * @return The supplied set of mutable nodes as a set of immutable nodes.
	 */
	protected abstract Set toTaxonomyNodes(
			Set nodes);

}