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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 (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 org.semanticweb.owlapi.normalform;

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

import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLClassExpressionVisitor;
import org.semanticweb.owlapi.model.OWLDataAllValuesFrom;
import org.semanticweb.owlapi.model.OWLDataExactCardinality;
import org.semanticweb.owlapi.model.OWLDataHasValue;
import org.semanticweb.owlapi.model.OWLDataMaxCardinality;
import org.semanticweb.owlapi.model.OWLDataMinCardinality;
import org.semanticweb.owlapi.model.OWLDataSomeValuesFrom;
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.OWLObjectMaxCardinality;
import org.semanticweb.owlapi.model.OWLObjectMinCardinality;
import org.semanticweb.owlapi.model.OWLObjectOneOf;
import org.semanticweb.owlapi.model.OWLObjectSomeValuesFrom;
import org.semanticweb.owlapi.model.OWLObjectUnionOf;

/** Author: Matthew Horridge

 * The University Of Manchester

 * Bio-Health Informatics Group

 * Date: 13-Oct-2007

 * 

 * 
 * Extracts the parts of a class expression which are negated. For example, A
 * and not (B or C or not D) would extract {(B or C or notD), D} */
public class OWLObjectComplementOfExtractor implements OWLClassExpressionVisitor {
    private final Set result;

    @SuppressWarnings("javadoc")
    public OWLObjectComplementOfExtractor() {
        result = new HashSet();
    }

    /** @param desc
     *            the class to look for
     * @return the complemented expressions */
    public Set
            getComplementedClassExpressions(OWLClassExpression desc) {
        // XXX a stateless visitor would not need copies
        reset();
        desc.accept(this);
        return new HashSet(result);
    }

    /** clear the visitor */
    public void reset() {
        result.clear();
    }

    @Override
    public void visit(OWLClass desc) {}

    @Override
    public void visit(OWLDataAllValuesFrom desc) {}

    @Override
    public void visit(OWLDataExactCardinality desc) {}

    @Override
    public void visit(OWLDataMaxCardinality desc) {}

    @Override
    public void visit(OWLDataMinCardinality desc) {}

    @Override
    public void visit(OWLDataSomeValuesFrom desc) {}

    @Override
    public void visit(OWLDataHasValue desc) {}

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

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

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

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

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

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

    @Override
    public void visit(OWLObjectOneOf desc) {}

    @Override
    public void visit(OWLObjectHasSelf desc) {}

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

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

    @Override
    public void visit(OWLObjectHasValue desc) {}
}