org.semanticweb.elk.reasoner.indexing.classes.ModifiableIndexedObjectSomeValuesFromImpl 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.completeness.Feature;
import org.semanticweb.elk.reasoner.indexing.model.IndexedComplexClassExpression;
import org.semanticweb.elk.reasoner.indexing.model.IndexedIndividual;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableIndexedClassExpression;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableIndexedObjectProperty;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableIndexedObjectSomeValuesFrom;
import org.semanticweb.elk.reasoner.indexing.model.ModifiableIndexedRangeFiller;
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.PropagationFromExistentialFillerRule;
import org.semanticweb.elk.util.hashing.HashGenerator;

/**
 * Implements {@link ModifiableIndexedObjectSomeValuesFrom}
 * 
 * @author "Yevgeny Kazakov"
 */
class ModifiableIndexedObjectSomeValuesFromImpl extends
		StructuralIndexedComplexClassExpressionEntryImpl
		implements ModifiableIndexedObjectSomeValuesFrom {

	private final ModifiableIndexedRangeFillerImpl rangeFiller_;

	ModifiableIndexedObjectSomeValuesFromImpl(
			ModifiableIndexedObjectProperty property,
			ModifiableIndexedClassExpression filler) {
		super(structuralHashCode(property, filler));
		this.rangeFiller_ = new ModifiableIndexedRangeFillerImpl(property,
				filler);
	}

	@Override
	public final ModifiableIndexedObjectProperty getProperty() {
		return rangeFiller_.getProperty();
	}

	@Override
	public final ModifiableIndexedClassExpression getFiller() {
		return rangeFiller_.getFiller();
	}

	@Override
	public ModifiableIndexedRangeFiller getRangeFiller() {
		return rangeFiller_;
	}

	@Override
	public RevertibleAction getIndexingAction(ModifiableOntologyIndex index,
			OccurrenceIncrement increment) {
		return RevertibleAction
				.create(() -> !occursNegatively()
						&& increment.negativeIncrement > 0,
						() -> PropagationFromExistentialFillerRule
								.addRuleFor(this, index),
						() -> PropagationFromExistentialFillerRule
								.removeRuleFor(this, index))
				.then(super.getIndexingAction(index, increment))
				.then(RevertibleAction.create(() -> {
					if (getFiller() instanceof IndexedIndividual) {
						index.occurrenceChanged(
								Feature.OBJECT_HAS_VALUE_POSITIVE,
								increment.positiveIncrement);
					}
					return true;
				}, () -> {
					if (getFiller() instanceof IndexedIndividual) {
						index.occurrenceChanged(
								Feature.OBJECT_HAS_VALUE_POSITIVE,
								-increment.positiveIncrement);
					}
				}))
				.then(RevertibleAction.create(
						() -> !occursNegatively()
								&& increment.negativeIncrement < 0,
						() -> PropagationFromExistentialFillerRule
								.removeRuleFor(this, index),
						() -> PropagationFromExistentialFillerRule
								.addRuleFor(this, index)));
	}

	static int structuralHashCode(ModifiableIndexedObjectProperty property,
			ModifiableIndexedClassExpression filler) {
		return HashGenerator.combinedHashCode(
				ModifiableIndexedObjectSomeValuesFromImpl.class, property, filler);
	}

	@Override
	public ModifiableIndexedObjectSomeValuesFromImpl structuralEquals(
			Object other) {
		if (this == other) {
			return this;
		}
		if (other instanceof ModifiableIndexedObjectSomeValuesFromImpl) {
			ModifiableIndexedObjectSomeValuesFromImpl secondEntry = (ModifiableIndexedObjectSomeValuesFromImpl) other;
			if (getProperty().equals(secondEntry.getProperty())
					&& getFiller().equals(secondEntry.getFiller()))
				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);
	}

}