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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.ArrayList;
import java.util.Collection;
import java.util.List;
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.OWLObject;
import org.semanticweb.owlapi.model.OWLObjectPropertyExpression;
import org.semanticweb.owlapi.model.OWLObjectVisitor;
import org.semanticweb.owlapi.model.OWLObjectVisitorEx;
import org.semanticweb.owlapi.model.OWLSubPropertyChainOfAxiom;

/**
 * @author Matthew Horridge, The University Of Manchester, Bio-Health Informatics Group
 * @since 2.0.0
 */
public class OWLSubPropertyChainAxiomImpl extends OWLPropertyAxiomImplWithEntityAndAnonCaching
    implements OWLSubPropertyChainOfAxiom {

    private static final long serialVersionUID = 40000L;
    @Nonnull
    private final List propertyChain;
    @Nonnull
    private final OWLObjectPropertyExpression superProperty;

    /**
     * @param propertyChain property chain
     * @param superProperty super property
     * @param annotations   annotations
     */
    public OWLSubPropertyChainAxiomImpl(
        @Nonnull List propertyChain,
        @Nonnull OWLObjectPropertyExpression superProperty,
        @Nonnull Collection annotations) {
        super(annotations);
        this.propertyChain =
            new ArrayList<>(checkNotNull(propertyChain, "propertyChain cannot be null"));
        this.superProperty = checkNotNull(superProperty, "superProperty cannot be null");
    }

    @Override
    public OWLSubPropertyChainOfAxiom getAnnotatedAxiom(Set annotations) {
        return new OWLSubPropertyChainAxiomImpl(getPropertyChain(), getSuperProperty(),
            mergeAnnos(annotations));
    }

    @Override
    public OWLSubPropertyChainOfAxiom getAxiomWithoutAnnotations() {
        if (!isAnnotated()) {
            return this;
        }
        return new OWLSubPropertyChainAxiomImpl(getPropertyChain(), getSuperProperty(),
            NO_ANNOTATIONS);
    }

    @Override
    public List getPropertyChain() {
        return new ArrayList<>(propertyChain);
    }

    @Override
    public OWLObjectPropertyExpression getSuperProperty() {
        return superProperty;
    }

    @Override
    public boolean isEncodingOfTransitiveProperty() {
        if (propertyChain.size() == 2) {
            return superProperty.equals(propertyChain.get(0))
                && superProperty.equals(propertyChain.get(1));
        } else {
            return false;
        }
    }

    @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 boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (!(obj instanceof OWLSubPropertyChainOfAxiom)) {
            return false;
        }
        OWLSubPropertyChainOfAxiom other = (OWLSubPropertyChainOfAxiom) obj;
        return other.getPropertyChain().equals(getPropertyChain())
            && other.getSuperProperty().equals(superProperty);
    }

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

    @Override
    protected int compareObjectOfSameType(OWLObject object) {
        OWLSubPropertyChainOfAxiom other = (OWLSubPropertyChainOfAxiom) object;
        for (int i = 0; i < propertyChain.size() && i < other.getPropertyChain().size(); i++) {
            int diff = propertyChain.get(i).compareTo(other.getPropertyChain().get(i));
            if (diff != 0) {
                return diff;
            }
        }
        int diff = propertyChain.size() - other.getPropertyChain().size();
        if (diff != 0) {
            return diff;
        }
        return superProperty.compareTo(other.getSuperProperty());
    }
}