FlagArgument.java example

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/*
 * $Id$
 *
 * Copyright (C) 2003-2015 JNode.org
 *
 * 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.
 */
 
package org.jnode.shell.syntax;

import org.jnode.shell.CommandLine.Token;

/**
 * A flag argument accepts any token to indicate that it is present.
 * 
 * @author crawley@jnode.org
 */
public class FlagArgument extends Argument<Boolean> {
    
    public FlagArgument(String label, int flags, String description) {
        super(label, flags, new Boolean[0], description);
    }

    public FlagArgument(String label, int flags) {
        this(label, flags, null);
    }

    @Override
    protected Boolean doAccept(Token token, int flags) throws CommandSyntaxException {
        return Boolean.TRUE;
    }
  
    @Override
    protected String argumentKind() {
        return "flag";
    }
}