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The core ELK Reasoner package
There is a newer version: 0.29.0
package org.semanticweb.elk.reasoner.saturation;

/*
 * #%L
 * ELK Reasoner
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2011 - 2014 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%
 */

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

import org.semanticweb.elk.reasoner.indexing.model.IndexedContextRoot;
import org.semanticweb.elk.reasoner.indexing.model.IndexedObjectSomeValuesFrom;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.BackwardLink;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.Propagation;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubClassConclusion;
import org.semanticweb.elk.reasoner.saturation.conclusions.model.SubContextInitialization;
import org.semanticweb.elk.reasoner.saturation.context.SubContext;
import org.semanticweb.elk.util.collections.ArrayHashSet;

public class SubContextImpl extends ArrayHashSet implements
		SubContext {

	Set propagatedSubsumers_;

	/**
	 * {@code true} if this {@link SubContext} was initialized
	 */
	private boolean isInitialized_ = false;

	/**
	 * the number of {@link SubClassConclusion}s contained in this {@link SubContext}
	 */
	private int size_ = 0;

	public SubContextImpl() {
		// represents the set of roots linked by the stored backward links
		super(3);
	}

	@Override
	public Set getLinkedRoots() {
		return this;
	}

	@Override
	public Set getPropagatedSubsumers() {
		if (propagatedSubsumers_ == null)
			return Collections.emptySet();
		// else
		return propagatedSubsumers_;
	}

	@Override
	public boolean addSubConclusion(SubClassConclusion conclusion) {
		boolean success = conclusion.accept(new SubConclusionInserter());
		if (success)
			size_++;
		return success;
	}

	@Override
	public boolean removeSubConclusion(SubClassConclusion conclusion) {
		boolean success = conclusion.accept(new SubConclusionDeletor());
		if (success)
			size_--;
		return success;
	}

	@Override
	public boolean containsSubConclusion(SubClassConclusion conclusion) {
		return conclusion.accept(new SubConclusionOccurrenceChecker());
	}

	@Override
	public boolean isInitialized() {
		return isInitialized_;
	}

	@Override
	public boolean isEmpty() {
		return size_ == 0;
	}

	public class SubConclusionInserter implements
			SubClassConclusion.Visitor {

		@Override
		public Boolean visit(BackwardLink subConclusion) {
			return add(subConclusion.getTraceRoot());
		}

		@Override
		public Boolean visit(Propagation subConclusion) {
			if (propagatedSubsumers_ == null)
				propagatedSubsumers_ = new ArrayHashSet(
						3);
			return propagatedSubsumers_.add(subConclusion.getCarry());
		}

		@Override
		public Boolean visit(SubContextInitialization subConclusion) {
			if (isInitialized_)
				// already initialized
				return false;
			// else
			isInitialized_ = true;
			return true;
		}
	}

	public class SubConclusionDeletor implements
			SubClassConclusion.Visitor {

		@Override
		public Boolean visit(BackwardLink subConclusion) {
			return remove(subConclusion.getTraceRoot());
		}

		@Override
		public Boolean visit(Propagation subConclusion) {
			if (propagatedSubsumers_ == null)
				return false;
			// else
			return propagatedSubsumers_.remove(subConclusion.getCarry());
		}

		@Override
		public Boolean visit(SubContextInitialization subConclusion) {
			if (!isInitialized_)
				// already not initialized
				return false;
			// else
			isInitialized_ = false;
			return true;
		}
	}

	public class SubConclusionOccurrenceChecker implements
			SubClassConclusion.Visitor {

		@Override
		public Boolean visit(BackwardLink subConclusion) {
			return contains(subConclusion.getTraceRoot());
		}

		@Override
		public Boolean visit(Propagation subConclusion) {
			if (propagatedSubsumers_ == null)
				return false;
			// else
			return propagatedSubsumers_
					.contains(subConclusion.getCarry());
		}

		@Override
		public Boolean visit(SubContextInitialization subConclusion) {
			return isInitialized_;
		}
	}

}