ClassPolicy.java

package uk.ac.manchester.cs.jfact.kernel.actors;

/* This file is part of the JFact DL reasoner
 Copyright 2011-2013 by Ignazio Palmisano, Dmitry Tsarkov, University of Manchester
 This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
 This library 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 Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA*/
import java.io.Serializable;

import uk.ac.manchester.cs.jfact.kernel.ClassifiableEntry;
import uk.ac.manchester.cs.jfact.kernel.Concept;
import uk.ac.manchester.cs.jfact.kernel.ExpressionManager;
import uk.ac.manchester.cs.jfact.kernel.dl.interfaces.Expression;

/** policy for concepts */
public class ClassPolicy implements Policy, Serializable {

    private static final long serialVersionUID = 11000L;

    @Override
    public boolean applicable(ClassifiableEntry p) {
        return !((Concept) p).isSingleton();
    }

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

    @Override
    public Expression buildTree(ExpressionManager EM, ClassifiableEntry p) {
        if (p.getId() >= 0) {
            return EM.concept(p.getName());
        }
        // top or bottom
        if (p.getName().equals(Concept.thing)) {
            return EM.top();
        } else if (p.getName().equals(Concept.nothing)) {
            return EM.bottom();
        } else {
            // error
            return null;
        }
    }
}