AvatarGuardElse.java

/* Copyright or (C) or Copr. GET / ENST, Telecom-Paris, Ludovic Apvrille
 * 
 * ludovic.apvrille AT enst.fr
 * 
 * This software is a computer program whose purpose is to allow the
 * edition of TURTLE analysis, design and deployment diagrams, to
 * allow the generation of RT-LOTOS or Java code from this diagram,
 * and at last to allow the analysis of formal validation traces
 * obtained from external tools, e.g. RTL from LAAS-CNRS and CADP
 * from INRIA Rhone-Alpes.
 * 
 * This software is governed by the CeCILL  license under French law and
 * abiding by the rules of distribution of free software.  You can  use,
 * modify and/ or redistribute the software under the terms of the CeCILL
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 * 
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 * 
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 * 
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */

package avatartranslator;

import java.util.Map;

/**
 * An AvatarGuardElse is an {@link AvatarGuard} that is of the form:
 * else
 * Creation: 25/09/2015
 * @version 1.0 25/09/2015
 * @author Florian LUGOU
 */
public class AvatarGuardElse extends AvatarGuard {
    public AvatarGuardElse () {
    }

    public AvatarGuard getRealGuard(AvatarStateMachineElement precedent) {
        AvatarGuard result = null;

        for (AvatarStateMachineElement asme: precedent.getNexts()) {
            if (! (asme instanceof AvatarTransition))
                continue;

            AvatarGuard guard = ((AvatarTransition) asme).getGuard();
            if (guard == this)
                continue;

            if (guard == null || !guard.isGuarded())
                // another guard is empty: else will never trigger
                // FIXME: add warning
                return new AvatarConstantGuard(AvatarConstant.FALSE);

            if (guard.isElseGuard())
                // there were two else guards... Shouldn't happen
                // FIXME: add warning
                // continue;
                return null;

            if (result == null)
                result = ((AvatarComposedGuard) guard).getOpposite();
            else
                result = AvatarGuard.addGuard(result, ((AvatarComposedGuard) guard).getOpposite(), "and");
        }

        return result;
    }

    public String getAsString (AvatarSyntaxTranslator translator) {
        return "else";
    }

    @Override
    public boolean isElseGuard () {
        return true;
    }

    @Override
    public AvatarGuardElse clone () {
        return new AvatarGuardElse ();
    }

    @Override
    public void replaceAttributes( Map<AvatarAttribute, AvatarAttribute> attributesMapping) { }
}