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uk.ac.manchester.cs.owl.owlapi.OWLEntityCollectionContainerCollector Maven / Gradle / Ivy

/*
 * This file is part of the OWL API.
 *
 * The contents of this file are subject to the LGPL License, Version 3.0.
 *
 * Copyright (C) 2011, The University of Manchester
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
 * in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 *
 * Copyright 2011, University of Manchester
 *
 * 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.
 */
package uk.ac.manchester.cs.owl.owlapi;

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Set;

import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnnotation;
import org.semanticweb.owlapi.model.OWLAnnotationAssertionAxiom;
import org.semanticweb.owlapi.model.OWLAnnotationProperty;
import org.semanticweb.owlapi.model.OWLAnnotationPropertyDomainAxiom;
import org.semanticweb.owlapi.model.OWLAnnotationPropertyRangeAxiom;
import org.semanticweb.owlapi.model.OWLAnonymousIndividual;
import org.semanticweb.owlapi.model.OWLAsymmetricObjectPropertyAxiom;
import org.semanticweb.owlapi.model.OWLAxiom;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLClassAssertionAxiom;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataAllValuesFrom;
import org.semanticweb.owlapi.model.OWLDataComplementOf;
import org.semanticweb.owlapi.model.OWLDataExactCardinality;
import org.semanticweb.owlapi.model.OWLDataHasValue;
import org.semanticweb.owlapi.model.OWLDataIntersectionOf;
import org.semanticweb.owlapi.model.OWLDataMaxCardinality;
import org.semanticweb.owlapi.model.OWLDataMinCardinality;
import org.semanticweb.owlapi.model.OWLDataOneOf;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLDataPropertyAssertionAxiom;
import org.semanticweb.owlapi.model.OWLDataPropertyDomainAxiom;
import org.semanticweb.owlapi.model.OWLDataPropertyExpression;
import org.semanticweb.owlapi.model.OWLDataPropertyRangeAxiom;
import org.semanticweb.owlapi.model.OWLDataRange;
import org.semanticweb.owlapi.model.OWLDataSomeValuesFrom;
import org.semanticweb.owlapi.model.OWLDataUnionOf;
import org.semanticweb.owlapi.model.OWLDatatype;
import org.semanticweb.owlapi.model.OWLDatatypeDefinitionAxiom;
import org.semanticweb.owlapi.model.OWLDatatypeRestriction;
import org.semanticweb.owlapi.model.OWLDeclarationAxiom;
import org.semanticweb.owlapi.model.OWLDifferentIndividualsAxiom;
import org.semanticweb.owlapi.model.OWLDisjointClassesAxiom;
import org.semanticweb.owlapi.model.OWLDisjointDataPropertiesAxiom;
import org.semanticweb.owlapi.model.OWLDisjointObjectPropertiesAxiom;
import org.semanticweb.owlapi.model.OWLDisjointUnionAxiom;
import org.semanticweb.owlapi.model.OWLEntity;
import org.semanticweb.owlapi.model.OWLEntityVisitor;
import org.semanticweb.owlapi.model.OWLEquivalentClassesAxiom;
import org.semanticweb.owlapi.model.OWLEquivalentDataPropertiesAxiom;
import org.semanticweb.owlapi.model.OWLEquivalentObjectPropertiesAxiom;
import org.semanticweb.owlapi.model.OWLFacetRestriction;
import org.semanticweb.owlapi.model.OWLFunctionalDataPropertyAxiom;
import org.semanticweb.owlapi.model.OWLFunctionalObjectPropertyAxiom;
import org.semanticweb.owlapi.model.OWLHasKeyAxiom;
import org.semanticweb.owlapi.model.OWLIndividual;
import org.semanticweb.owlapi.model.OWLInverseFunctionalObjectPropertyAxiom;
import org.semanticweb.owlapi.model.OWLInverseObjectPropertiesAxiom;
import org.semanticweb.owlapi.model.OWLIrreflexiveObjectPropertyAxiom;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
import org.semanticweb.owlapi.model.OWLNegativeDataPropertyAssertionAxiom;
import org.semanticweb.owlapi.model.OWLNegativeObjectPropertyAssertionAxiom;
import org.semanticweb.owlapi.model.OWLObjectAllValuesFrom;
import org.semanticweb.owlapi.model.OWLObjectComplementOf;
import org.semanticweb.owlapi.model.OWLObjectExactCardinality;
import org.semanticweb.owlapi.model.OWLObjectHasSelf;
import org.semanticweb.owlapi.model.OWLObjectHasValue;
import org.semanticweb.owlapi.model.OWLObjectIntersectionOf;
import org.semanticweb.owlapi.model.OWLObjectInverseOf;
import org.semanticweb.owlapi.model.OWLObjectMaxCardinality;
import org.semanticweb.owlapi.model.OWLObjectMinCardinality;
import org.semanticweb.owlapi.model.OWLObjectOneOf;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.model.OWLObjectPropertyAssertionAxiom;
import org.semanticweb.owlapi.model.OWLObjectPropertyDomainAxiom;
import org.semanticweb.owlapi.model.OWLObjectPropertyExpression;
import org.semanticweb.owlapi.model.OWLObjectPropertyRangeAxiom;
import org.semanticweb.owlapi.model.OWLObjectSomeValuesFrom;
import org.semanticweb.owlapi.model.OWLObjectUnionOf;
import org.semanticweb.owlapi.model.OWLObjectVisitor;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLPropertyExpression;
import org.semanticweb.owlapi.model.OWLReflexiveObjectPropertyAxiom;
import org.semanticweb.owlapi.model.OWLSameIndividualAxiom;
import org.semanticweb.owlapi.model.OWLSubAnnotationPropertyOfAxiom;
import org.semanticweb.owlapi.model.OWLSubClassOfAxiom;
import org.semanticweb.owlapi.model.OWLSubDataPropertyOfAxiom;
import org.semanticweb.owlapi.model.OWLSubObjectPropertyOfAxiom;
import org.semanticweb.owlapi.model.OWLSubPropertyChainOfAxiom;
import org.semanticweb.owlapi.model.OWLSymmetricObjectPropertyAxiom;
import org.semanticweb.owlapi.model.OWLTransitiveObjectPropertyAxiom;
import org.semanticweb.owlapi.model.SWRLArgument;
import org.semanticweb.owlapi.model.SWRLAtom;
import org.semanticweb.owlapi.model.SWRLBuiltInAtom;
import org.semanticweb.owlapi.model.SWRLClassAtom;
import org.semanticweb.owlapi.model.SWRLDataPropertyAtom;
import org.semanticweb.owlapi.model.SWRLDataRangeAtom;
import org.semanticweb.owlapi.model.SWRLDifferentIndividualsAtom;
import org.semanticweb.owlapi.model.SWRLIndividualArgument;
import org.semanticweb.owlapi.model.SWRLLiteralArgument;
import org.semanticweb.owlapi.model.SWRLObjectPropertyAtom;
import org.semanticweb.owlapi.model.SWRLObjectVisitor;
import org.semanticweb.owlapi.model.SWRLRule;
import org.semanticweb.owlapi.model.SWRLSameIndividualAtom;
import org.semanticweb.owlapi.model.SWRLVariable;

/**
 * A utility class that visits axioms, class expressions etc. and accumulates
 * the named objects that are referred to in those axioms, class expressions
 * etc. For example, if the collector visited the axiom (propP some C)
 * subClassOf (propQ some D), it would contain the objects propP, C, propQ and
 * D.
 * 
 * @author Matthew Horridge, The University Of Manchester, Bio-Health
 *         Informatics Group, Date: 13-Nov-2006
 */
public class OWLEntityCollectionContainerCollector implements OWLObjectVisitor,
        SWRLObjectVisitor {

    private Collection objects;
    private final Collection anonymousIndividuals;
    private boolean collectClasses = true;
    private boolean collectObjectProperties = true;
    private boolean collectDataProperties = true;
    private boolean collectIndividuals = true;
    private boolean collectDatatypes = true;

    /**
     * @param toReturn
     *        the set that will contain the results
     * @param anonsToReturn
     *        the set that will contain the anon individuals
     */
    public OWLEntityCollectionContainerCollector(Set toReturn,
            Collection anonsToReturn) {
        objects = toReturn;
        anonymousIndividuals = anonsToReturn;
    }

    /**
     * @param toReturn
     *        the set that will contain the results
     */
    public OWLEntityCollectionContainerCollector(Set toReturn) {
        objects = toReturn;
        anonymousIndividuals = fake;
    }

    /**
     * Deprecated default constructor: use one of the other constructors to get
     * more efficient set creation.
     */
    @Deprecated
    public OWLEntityCollectionContainerCollector() {
        this(new HashSet(), new HashSet());
    }

    /**
     * Clears all objects that have accumulated during the course of visiting
     * axioms, class expressions etc.
     * 
     * @param toReturn
     *        the set that will contain the results
     */
    // XXX not in the interface
    public void reset(Set toReturn) {
        objects = toReturn;
        anonymousIndividuals.clear();
    }

    /**
     * @param collectClasses
     *        true to collect classes
     */
    // XXX not in the interface
    public void setCollectClasses(boolean collectClasses) {
        this.collectClasses = collectClasses;
    }

    /**
     * @param collectObjectProperties
     *        true to collect object properties
     */
    // XXX not in the interface
    public void setCollectObjectProperties(boolean collectObjectProperties) {
        this.collectObjectProperties = collectObjectProperties;
    }

    /**
     * @param collectDataProperties
     *        true to collect data properties
     */
    public void setCollectDataProperties(boolean collectDataProperties) {
        this.collectDataProperties = collectDataProperties;
    }

    /**
     * @param collectIndividuals
     *        true to collect individuals
     */
    // XXX not in the interface
    public void setCollectIndividuals(boolean collectIndividuals) {
        this.collectIndividuals = collectIndividuals;
    }

    /**
     * @param collectDatatypes
     *        true to collect datatypes
     */
    // XXX not in the interface
    public void setCollectDatatypes(boolean collectDatatypes) {
        this.collectDatatypes = collectDatatypes;
    }

    /**
     * Gets the objects that are used by all axioms, class expressions etc. that
     * this collector has visited since it was constructed or reset. Deprecated:
     * if the non deprecated constructors are used, this method is useless and
     * inefficient
     * 
     * @return A set of entities. This will be a copy.
     */
    @Deprecated
    public Set getObjects() {
        return new HashSet(objects);
    }

    /**
     * A convenience method. Although anonymous individuals are not entities
     * they are collected by this collector and stored in a separate set. This
     * method returns collected individuals. Deprecated: if the non deprecated
     * constructors are used, this method is useless and inefficient
     * 
     * @return The set of anonymous individuals that were collected by the
     *         collector
     */
    @Deprecated
    public Set getAnonymousIndividuals() {
        return new HashSet(anonymousIndividuals);
    }

    // ////////////////////////////////////////////////////////////////////////////////////////////
    //
    // Axiom Visitor stuff
    //
    // ////////////////////////////////////////////////////////////////////////////////////////////
    private final CollectionContainerVisitor annotationVisitor = new CollectionContainerVisitor() {

        @Override
        public void visit(CollectionContainer c) {}

        @Override
        public void visitItem(OWLAnnotation c) {
            c.accept(OWLEntityCollectionContainerCollector.this);
        }
    };

    @SuppressWarnings("unchecked")
    protected void processAxiomAnnotations(OWLAxiom ax) {
        // an OWLAxiomImpl will implement this interface with 
        // parameter; this will avoid creating a defensive copy of the
        // annotation set
        if (ax instanceof CollectionContainer) {
            ((CollectionContainer) ax).accept(annotationVisitor);
        } else {
            // default behavior: iterate over the annotations outside the axiom
            for (OWLAnnotation anno : ax.getAnnotations()) {
                anno.accept(this);
            }
        }
    }

    @Override
    public void visit(OWLSubClassOfAxiom axiom) {
        axiom.getSubClass().accept(this);
        axiom.getSuperClass().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLNegativeObjectPropertyAssertionAxiom axiom) {
        axiom.getSubject().accept(this);
        axiom.getProperty().accept(this);
        axiom.getObject().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLAsymmetricObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLReflexiveObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDisjointClassesAxiom axiom) {
        for (OWLClassExpression desc : axiom.getClassExpressions()) {
            desc.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDataPropertyDomainAxiom axiom) {
        axiom.getDomain().accept(this);
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLObjectPropertyDomainAxiom axiom) {
        axiom.getDomain().accept(this);
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLEquivalentObjectPropertiesAxiom axiom) {
        for (OWLObjectPropertyExpression prop : axiom.getProperties()) {
            prop.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLNegativeDataPropertyAssertionAxiom axiom) {
        axiom.getSubject().accept(this);
        axiom.getProperty().accept(this);
        axiom.getObject().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDifferentIndividualsAxiom axiom) {
        for (OWLIndividual ind : axiom.getIndividuals()) {
            ind.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDisjointDataPropertiesAxiom axiom) {
        for (OWLDataPropertyExpression prop : axiom.getProperties()) {
            prop.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDisjointObjectPropertiesAxiom axiom) {
        for (OWLObjectPropertyExpression prop : axiom.getProperties()) {
            prop.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLObjectPropertyRangeAxiom axiom) {
        axiom.getRange().accept(this);
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLObjectPropertyAssertionAxiom axiom) {
        axiom.getSubject().accept(this);
        axiom.getProperty().accept(this);
        axiom.getObject().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLFunctionalObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLSubObjectPropertyOfAxiom axiom) {
        axiom.getSubProperty().accept(this);
        axiom.getSuperProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDisjointUnionAxiom axiom) {
        axiom.getOWLClass().accept((OWLEntityVisitor) this);
        for (OWLClassExpression desc : axiom.getClassExpressions()) {
            desc.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDeclarationAxiom axiom) {
        axiom.getEntity().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLSymmetricObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDataPropertyRangeAxiom axiom) {
        axiom.getProperty().accept(this);
        axiom.getRange().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLFunctionalDataPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLEquivalentDataPropertiesAxiom axiom) {
        for (OWLDataPropertyExpression prop : axiom.getProperties()) {
            prop.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLClassAssertionAxiom axiom) {
        axiom.getClassExpression().accept(this);
        axiom.getIndividual().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLEquivalentClassesAxiom axiom) {
        for (OWLClassExpression desc : axiom.getClassExpressions()) {
            desc.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDataPropertyAssertionAxiom axiom) {
        axiom.getSubject().accept(this);
        axiom.getProperty().accept(this);
        axiom.getObject().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLTransitiveObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLIrreflexiveObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLSubDataPropertyOfAxiom axiom) {
        axiom.getSubProperty().accept(this);
        axiom.getSuperProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLInverseFunctionalObjectPropertyAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLSameIndividualAxiom axiom) {
        for (OWLIndividual ind : axiom.getIndividuals()) {
            ind.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLSubPropertyChainOfAxiom axiom) {
        for (OWLObjectPropertyExpression prop : axiom.getPropertyChain()) {
            prop.accept(this);
        }
        axiom.getSuperProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLInverseObjectPropertiesAxiom axiom) {
        axiom.getFirstProperty().accept(this);
        axiom.getSecondProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLHasKeyAxiom axiom) {
        axiom.getClassExpression().accept(this);
        for (OWLPropertyExpression prop : axiom.getPropertyExpressions()) {
            prop.accept(this);
        }
        processAxiomAnnotations(axiom);
    }

    // //////////////////////////////////////////////////////////////////////////////////////////////////////////
    //
    // OWLClassExpressionVisitor
    //
    // //////////////////////////////////////////////////////////////////////////////////////////////////////////
    @Override
    public void visit(OWLClass desc) {
        if (collectClasses) {
            objects.add(desc);
        }
    }

    @Override
    public void visit(OWLObjectIntersectionOf desc) {
        for (OWLClassExpression operand : desc.getOperands()) {
            operand.accept(this);
        }
    }

    @Override
    public void visit(OWLObjectUnionOf desc) {
        for (OWLClassExpression operand : desc.getOperands()) {
            operand.accept(this);
        }
    }

    @Override
    public void visit(OWLObjectComplementOf desc) {
        desc.getOperand().accept(this);
    }

    @Override
    public void visit(OWLObjectSomeValuesFrom desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLObjectAllValuesFrom desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLObjectHasValue desc) {
        desc.getProperty().accept(this);
        desc.getValue().accept(this);
    }

    @Override
    public void visit(OWLObjectMinCardinality desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLObjectExactCardinality desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLObjectMaxCardinality desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLObjectHasSelf desc) {
        desc.getProperty().accept(this);
    }

    @Override
    public void visit(OWLObjectOneOf desc) {
        for (OWLIndividual ind : desc.getIndividuals()) {
            ind.accept(this);
        }
    }

    @Override
    public void visit(OWLDataSomeValuesFrom desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLDataAllValuesFrom desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLDataHasValue desc) {
        desc.getProperty().accept(this);
        desc.getValue().accept(this);
    }

    @Override
    public void visit(OWLDataMinCardinality desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLDataExactCardinality desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    @Override
    public void visit(OWLDataMaxCardinality desc) {
        desc.getProperty().accept(this);
        desc.getFiller().accept(this);
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////////////////
    //
    // Data visitor
    //
    // ///////////////////////////////////////////////////////////////////////////////////////////////////////////
    @Override
    public void visit(OWLDataComplementOf node) {
        node.getDataRange().accept(this);
    }

    @Override
    public void visit(OWLDataOneOf node) {
        for (OWLLiteral val : node.getValues()) {
            val.accept(this);
        }
    }

    @Override
    public void visit(OWLDataIntersectionOf node) {
        for (OWLDataRange dr : node.getOperands()) {
            dr.accept(this);
        }
    }

    @Override
    public void visit(OWLDataUnionOf node) {
        for (OWLDataRange dr : node.getOperands()) {
            dr.accept(this);
        }
    }

    @Override
    public void visit(OWLDatatypeRestriction node) {
        node.getDatatype().accept(this);
        for (OWLFacetRestriction facetRestriction : node.getFacetRestrictions()) {
            facetRestriction.accept(this);
        }
    }

    @Override
    public void visit(OWLFacetRestriction node) {
        node.getFacetValue().accept(this);
    }

    @Override
    public void visit(OWLLiteral node) {
        node.getDatatype().accept(this);
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////////////////
    //
    // Property expression visitor
    //
    // ///////////////////////////////////////////////////////////////////////////////////////////////////////////
    @Override
    public void visit(OWLObjectInverseOf expression) {
        expression.getInverse().accept(this);
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////////////////
    //
    // Entity visitor
    //
    // ///////////////////////////////////////////////////////////////////////////////////////////////////////////
    @Override
    public void visit(OWLObjectProperty property) {
        if (collectObjectProperties) {
            objects.add(property);
        }
    }

    @Override
    public void visit(OWLDataProperty property) {
        if (collectDataProperties) {
            objects.add(property);
        }
    }

    @Override
    public void visit(OWLNamedIndividual individual) {
        if (collectIndividuals) {
            objects.add(individual);
        }
    }

    @Override
    public void visit(OWLDatatype datatype) {
        if (collectDatatypes) {
            objects.add(datatype);
        }
    }

    @Override
    public void visit(OWLAnnotation annotation) {
        annotation.getProperty().accept(this);
        annotation.getValue().accept(this);
        for (OWLAnnotation anno : annotation.getAnnotations()) {
            anno.accept(this);
        }
    }

    @Override
    public void visit(OWLAnnotationAssertionAxiom axiom) {
        axiom.getSubject().accept(this);
        axiom.getProperty().accept(this);
        axiom.getValue().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLAnonymousIndividual individual) {
        // Anon individuals aren't entities
        // But store them in a set anyway for utility
        anonymousIndividuals.add(individual);
    }

    @Override
    public void visit(IRI iri) {}

    @Override
    public void visit(OWLOntology ontology) {
        objects.addAll(ontology.getSignature());
    }

    @Override
    public void visit(OWLAnnotationProperty property) {
        objects.add(property);
    }

    @Override
    public void visit(OWLAnnotationPropertyDomainAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLAnnotationPropertyRangeAxiom axiom) {
        axiom.getProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLSubAnnotationPropertyOfAxiom axiom) {
        axiom.getSubProperty().accept(this);
        axiom.getSuperProperty().accept(this);
        processAxiomAnnotations(axiom);
    }

    @Override
    public void visit(OWLDatatypeDefinitionAxiom axiom) {
        axiom.getDatatype().accept(this);
        axiom.getDataRange().accept(this);
        processAxiomAnnotations(axiom);
    }

    // /////////////////////////////////////////////////////////////////////////////////////////////////////////////
    //
    // SWRL Object Visitor
    //
    // /////////////////////////////////////////////////////////////////////////////////////////////////////////////
    @Override
    public void visit(SWRLRule rule) {
        for (SWRLAtom atom : rule.getBody()) {
            atom.accept(this);
        }
        for (SWRLAtom atom : rule.getHead()) {
            atom.accept(this);
        }
        processAxiomAnnotations(rule);
    }

    @Override
    public void visit(SWRLClassAtom node) {
        node.getArgument().accept(this);
        node.getPredicate().accept(this);
    }

    @Override
    public void visit(SWRLDataRangeAtom node) {
        node.getArgument().accept(this);
        node.getPredicate().accept(this);
    }

    @Override
    public void visit(SWRLObjectPropertyAtom node) {
        node.getPredicate().accept(this);
        node.getFirstArgument().accept(this);
        node.getSecondArgument().accept(this);
    }

    @Override
    public void visit(SWRLDataPropertyAtom node) {
        node.getPredicate().accept(this);
        node.getFirstArgument().accept(this);
        node.getSecondArgument().accept(this);
    }

    @Override
    public void visit(SWRLBuiltInAtom node) {
        for (SWRLArgument obj : node.getAllArguments()) {
            obj.accept(this);
        }
    }

    @Override
    public void visit(SWRLVariable node) {}

    @Override
    public void visit(SWRLIndividualArgument node) {
        node.getIndividual().accept(this);
    }

    @Override
    public void visit(SWRLLiteralArgument node) {
        node.getLiteral().accept(this);
    }

    @Override
    public void visit(SWRLDifferentIndividualsAtom node) {
        node.getFirstArgument().accept(this);
    }

    @Override
    public void visit(SWRLSameIndividualAtom node) {
        node.getSecondArgument().accept(this);
    }

    private static final List fake = new List() {

        @Override
        public  T[] toArray(T[] arg0) {
            return arg0;
        }

        @Override
        public Object[] toArray() {
            return new Object[0];
        }

        @Override
        public List subList(int arg0, int arg1) {
            return null;
        }

        @Override
        public int size() {
            return 0;
        }

        @Override
        public OWLAnonymousIndividual
                set(int arg0, OWLAnonymousIndividual arg1) {
            return null;
        }

        @Override
        public boolean retainAll(Collection arg0) {
            return false;
        }

        @Override
        public boolean removeAll(Collection arg0) {
            return false;
        }

        @Override
        public OWLAnonymousIndividual remove(int arg0) {
            return null;
        }

        @Override
        public boolean remove(Object arg0) {
            return false;
        }

        @Override
        public ListIterator listIterator(int arg0) {
            return null;
        }

        @Override
        public ListIterator listIterator() {
            return null;
        }

        @Override
        public int lastIndexOf(Object arg0) {
            return 0;
        }

        @Override
        public Iterator iterator() {
            return null;
        }

        @Override
        public boolean isEmpty() {
            return false;
        }

        @Override
        public int indexOf(Object arg0) {
            return 0;
        }

        @Override
        public OWLAnonymousIndividual get(int arg0) {
            return null;
        }

        @Override
        public boolean containsAll(Collection arg0) {
            return false;
        }

        @Override
        public boolean contains(Object arg0) {
            return false;
        }

        @Override
        public void clear() {}

        @Override
        public boolean addAll(int arg0,
                Collection arg1) {
            return false;
        }

        @Override
        public boolean
                addAll(Collection arg0) {
            return false;
        }

        @Override
        public void add(int arg0, OWLAnonymousIndividual arg1) {}

        @Override
        public boolean add(OWLAnonymousIndividual arg0) {
            return false;
        }
    };
}




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