oidtokenizer.java

这是linux下ssl vpn的实现程序

/*
 *  SSL-Explorer
 *
 *  Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
			
package com.maverick.crypto.asn1;

/**
 * class for breaking up an OID into it's component tokens, ala
 * java.util.StringTokenizer. We need this class as some of the
 * lightweight Java environment don't support classes like
 * StringTokenizer.
 */
public class OIDTokenizer
{
    private String  oid;
    private int     index;

    public OIDTokenizer(
        String oid)
    {
        this.oid = oid;
        this.index = 0;
    }

    public boolean hasMoreTokens()
    {
        return (index != -1);
    }

    public String nextToken()
    {
        if (index == -1)
        {
            return null;
        }

        String  token;
        int     end = oid.indexOf('.', index);

        if (end == -1)
        {
            token = oid.substring(index);
            index = -1;
            return token;
        }

        token = oid.substring(index, end);

        index = end + 1;
        return token;
    }
}