org.semanticweb.elk.reasoner.taxonomy.SingletoneTaxonomy Maven / Gradle / Ivy

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/*
 * #%L
 * ELK Reasoner
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2013 Department of Computer Science, University of Oxford
 * %%
 * 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
 * limitations under the License.
 * #L%
 */
package org.semanticweb.elk.reasoner.taxonomy;

import java.util.Collection;
import java.util.Collections;
import java.util.Set;

import org.semanticweb.elk.owl.interfaces.ElkEntity;
import org.semanticweb.elk.reasoner.taxonomy.impl.AbstractTaxonomy;
import org.semanticweb.elk.reasoner.taxonomy.model.ComparatorKeyProvider;
import org.semanticweb.elk.reasoner.taxonomy.model.NodeStore;
import org.semanticweb.elk.reasoner.taxonomy.model.Taxonomy;
import org.semanticweb.elk.reasoner.taxonomy.model.TaxonomyNodeFactory;

/**
 * A {@link Taxonomy} consisting of a single node = top node = bottom node.
 * Typically, this is used to represent an inconsistent taxonomy.
 * 
 * @author "Yevgeny Kazakov"
 * @author Peter Skocovsky
 * 
 * @param 
 *            the type of objects stored in this taxonomy
 * @param 
 *            the type of the node of this taxonomy
 * 
 * @see OrphanTaxonomyNode
 */
public class SingletoneTaxonomy>
		extends AbstractTaxonomy {

	private final ComparatorKeyProvider keyProvider_;

	final N node;

	// TODO: let taxonomy implement node directly
	
	public SingletoneTaxonomy(
			final ComparatorKeyProvider keyProvider,
			final Collection allMembers,
			final TaxonomyNodeFactory> nodeFactory) {
		this.keyProvider_ = keyProvider;
		this.node = nodeFactory.createNode(allMembers, allMembers.size(), this);
	}

	@Override
	public ComparatorKeyProvider getKeyProvider() {
		return keyProvider_;
	}

	@Override
	public N getNode(T elkEntity) {
		if (node.contains(elkEntity)) {
			return node;
		}
		// else
		return null;
	}

	@Override
	public Set getNodes() {
		return Collections.singleton(node);
	}

	@Override
	public N getTopNode() {
		return node;
	}

	@Override
	public N getBottomNode() {
		return node;
	}

	@Override
	public boolean addListener(final NodeStore.Listener listener) {
		// No events are ever fired.
		return true;
	}

	@Override
	public boolean removeListener(final NodeStore.Listener listener) {
		// No events are ever fired.
		return true;
	}

	@Override
	public boolean addListener(final Taxonomy.Listener listener) {
		// No events are ever fired.
		return true;
	}

	@Override
	public boolean removeListener(final Taxonomy.Listener listener) {
		// No events are ever fired.
		return true;
	}

}