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/* This file is part of the OWL API.
 * The contents of this file are subject to the LGPL License, Version 3.0.
 * Copyright 2014, 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.
 * 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 static org.semanticweb.owlapi.util.OWLAPIPreconditions.checkNotNull;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import javax.annotation.Nonnull;

import org.semanticweb.owlapi.model.AxiomType;
import org.semanticweb.owlapi.model.OWLAnnotation;
import org.semanticweb.owlapi.model.OWLAxiomVisitor;
import org.semanticweb.owlapi.model.OWLAxiomVisitorEx;
import org.semanticweb.owlapi.model.OWLInverseObjectPropertiesAxiom;
import org.semanticweb.owlapi.model.OWLObjectPropertyExpression;
import org.semanticweb.owlapi.model.OWLObjectVisitor;
import org.semanticweb.owlapi.model.OWLObjectVisitorEx;
import org.semanticweb.owlapi.model.OWLPairwiseVisitor;
import org.semanticweb.owlapi.model.OWLSubObjectPropertyOfAxiom;
import org.semanticweb.owlapi.util.CollectionFactory;

/**
 * @author Matthew Horridge, The University Of Manchester, Bio-Health Informatics Group
 * @since 2.0.0
 */
public class OWLInverseObjectPropertiesAxiomImpl
    extends OWLNaryPropertyAxiomImpl
    implements OWLInverseObjectPropertiesAxiom {

    private static final long serialVersionUID = 40000L;

    /**
     * @param first       first property
     * @param second      second property
     * @param annotations annotations
     */
    public OWLInverseObjectPropertiesAxiomImpl(@Nonnull OWLObjectPropertyExpression first,
        @Nonnull OWLObjectPropertyExpression second,
        @Nonnull Collection annotations) {
        super(annotations, checkNotNull(first, "first cannot be null"),
            checkNotNull(second, "second cannot be null"));
    }

    @Override
    public Set asPairwiseAxioms() {
        return CollectionFactory.createSet((OWLInverseObjectPropertiesAxiom) this);
    }

    @Override
    public Set splitToAnnotatedPairs() {
        return asPairwiseAxioms();
    }

    @Override
    public OWLInverseObjectPropertiesAxiom getAxiomWithoutAnnotations() {
        if (!isAnnotated()) {
            return this;
        }
        return new OWLInverseObjectPropertiesAxiomImpl(getFirstProperty(), getSecondProperty(),
            NO_ANNOTATIONS);
    }

    @Override
    public OWLInverseObjectPropertiesAxiom getAnnotatedAxiom(Set annotations) {
        return new OWLInverseObjectPropertiesAxiomImpl(getFirstProperty(), getSecondProperty(),
            mergeAnnos(annotations));
    }

    @Override
    public void accept(OWLObjectVisitor visitor) {
        visitor.visit(this);
    }

    @Override
    public void accept(OWLAxiomVisitor visitor) {
        visitor.visit(this);
    }

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

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

    @Override
    public OWLObjectPropertyExpression getFirstProperty() {
        return properties.get(0);
    }

    @Override
    public OWLObjectPropertyExpression getSecondProperty() {
        return properties.get(1);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        return obj instanceof OWLInverseObjectPropertiesAxiom;
    }

    @Override
    public AxiomType getAxiomType() {
        return AxiomType.INVERSE_OBJECT_PROPERTIES;
    }

    @Override
    public Set asSubObjectPropertyOfAxioms() {
        Set axs = new HashSet<>();
        axs.add(new OWLSubObjectPropertyOfAxiomImpl(getFirstProperty(),
            getSecondProperty().getInverseProperty(), NO_ANNOTATIONS));
        axs.add(new OWLSubObjectPropertyOfAxiomImpl(getSecondProperty(),
            getFirstProperty().getInverseProperty(), NO_ANNOTATIONS));
        return axs;
    }

    @Override
    public  Collection walkPairwise(
        OWLPairwiseVisitor visitor) {
        T t = visitor.visit(getFirstProperty(), getSecondProperty());
        if (t != null) {
            return CollectionFactory.createSet(t);
        }
        return CollectionFactory.emptyList();
    }
}