org.semanticweb.elk.reasoner.indexing.classes.ModifiableIndexedObjectIntersectionOfImpl Maven / Gradle / Ivy

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/*
 * #%L
 * ELK Reasoner
 * 
 * $Id$
 * $HeadURL$
 * %%
 * Copyright (C) 2011 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.indexing.classes;

import org.semanticweb.elk.RevertibleAction;
import org.semanticweb.elk.reasoner.indexing.model.IndexedComplexClassExpression;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableIndexedClassExpression;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableIndexedObjectIntersectionOf;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableOntologyIndex;
import org.semanticweb.elk.reasoner.indexing.model.OccurrenceIncrement;
import org.semanticweb.elk.reasoner.indexing.model.StructuralIndexedSubObject;
import org.semanticweb.elk.reasoner.saturation.rules.subsumers.ObjectIntersectionFromFirstConjunctRule;
import org.semanticweb.elk.reasoner.saturation.rules.subsumers.ObjectIntersectionFromSecondConjunctRule;
import org.semanticweb.elk.util.hashing.HashGenerator;

/**
 * Implements {@link ModifiableIndexedObjectIntersectionOf}
 * 
 * @author "Yevgeny Kazakov"
 */
class ModifiableIndexedObjectIntersectionOfImpl extends
		StructuralIndexedComplexClassExpressionEntryImpl
		implements ModifiableIndexedObjectIntersectionOf {

	private final ModifiableIndexedClassExpression firstConjunct_,
			secondConjunct_;

	ModifiableIndexedObjectIntersectionOfImpl(
			ModifiableIndexedClassExpression firstConjunct,
			ModifiableIndexedClassExpression secondConjunct) {
		super(structuralHashCode(firstConjunct, secondConjunct));
		this.firstConjunct_ = firstConjunct;
		this.secondConjunct_ = secondConjunct;
	}

	@Override
	public final ModifiableIndexedClassExpression getFirstConjunct() {
		return firstConjunct_;
	}

	@Override
	public final ModifiableIndexedClassExpression getSecondConjunct() {
		return secondConjunct_;
	}

	@Override
	public RevertibleAction getIndexingAction(ModifiableOntologyIndex index,
			OccurrenceIncrement increment) {
		return RevertibleAction
				.create(() -> !occursNegatively()
						&& increment.negativeIncrement > 0,
						() -> ObjectIntersectionFromFirstConjunctRule
								.addRulesFor(this, index),
						() -> ObjectIntersectionFromFirstConjunctRule
								.removeRulesFor(this, index))
				.then(RevertibleAction.create(
						() -> !occursNegatively()
								&& increment.negativeIncrement > 0,
						() -> ObjectIntersectionFromSecondConjunctRule
								.addRulesFor(this, index),
						() -> ObjectIntersectionFromSecondConjunctRule
								.removeRulesFor(this, index)))
				.then(super.getIndexingAction(index, increment))
				.then(RevertibleAction.create(
						() -> !occursNegatively()
								&& increment.negativeIncrement < 0,
						() -> ObjectIntersectionFromFirstConjunctRule
								.removeRulesFor(this, index),
						() -> ObjectIntersectionFromFirstConjunctRule
								.addRulesFor(this, index)))
				.then(RevertibleAction.create(
						() -> !occursNegatively()
								&& increment.negativeIncrement < 0,
						() -> ObjectIntersectionFromSecondConjunctRule
								.removeRulesFor(this, index),
						() -> ObjectIntersectionFromSecondConjunctRule
								.addRulesFor(this, index)));

	}

	static int structuralHashCode(
			ModifiableIndexedClassExpression firstConjunct,
			ModifiableIndexedClassExpression secondConjunct) {
		return HashGenerator.combinedHashCode(
				ModifiableIndexedObjectIntersectionOfImpl.class, firstConjunct,
				secondConjunct);
	}

	@Override
	public ModifiableIndexedObjectIntersectionOfImpl structuralEquals(
			Object other) {
		if (this == other) {
			return this;
		}
		if (other instanceof ModifiableIndexedObjectIntersectionOfImpl) {
			ModifiableIndexedObjectIntersectionOfImpl secondEntry = (ModifiableIndexedObjectIntersectionOfImpl) other;
			if (getFirstConjunct().equals(secondEntry.getFirstConjunct())
					&& getSecondConjunct()
							.equals(secondEntry.getSecondConjunct()))
				return secondEntry;
		}
		// else
		return null;
	}

	@Override
	public final  O accept(
			IndexedComplexClassExpression.Visitor visitor) {
		return visitor.visit(this);
	}

	@Override
	public  O accept(StructuralIndexedSubObject.Visitor visitor) {
		return visitor.visit(this);
	}

}