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/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2019 Guardsquare NV
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.shrink;


import proguard.classfile.VisitorAccepter;

/**
 * This class marks visitor accepters, in order to remember whether they are
 * unused, possibly used, or definitely used.
 */
public class SimpleUsageMarker
{
    private final Object POSSIBLY_USED = new Object();
    private final Object USED          = new Object();


    /**
     * Marks the given visitor accepter as possibly being used.
     */
    public void markAsPossiblyUsed(VisitorAccepter visitorAccepter)
    {
        visitorAccepter.setVisitorInfo(POSSIBLY_USED);
    }


    /**
     * Returns whether the given visitor accepter has been marked as possibly
     * being used.
     */
    public boolean isPossiblyUsed(VisitorAccepter visitorAccepter)
    {
        return visitorAccepter.getVisitorInfo() == POSSIBLY_USED;
    }


    /**
     * Marks the given visitor accepter as being used.
     */
    public void markAsUsed(VisitorAccepter visitorAccepter)
    {
        visitorAccepter.setVisitorInfo(USED);
    }


    /**
     * Clears any usage marks from the given visitor accepter.
     */
    public void markAsUnused(VisitorAccepter visitorAccepter)
    {
        visitorAccepter.setVisitorInfo(null);
    }


    /**
     * Returns whether the given visitor accepter has been marked as being used.
     */
    public boolean isUsed(VisitorAccepter visitorAccepter)
    {
        return visitorAccepter.getVisitorInfo() == USED;
    }
}