001    /*
002     * Copyright (c) 2000 - 2006 The Legion Of The Bouncy Castle (http://www.bouncycastle.org)
003     * 
004     * Permission is hereby granted, free of charge, to any person obtaining a copy of this
005     * software and associated documentation files (the "Software"), to deal in the Software
006     * without restriction, including without limitation the rights to use, copy, modify,
007     * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
008     * permit persons to whom the Software is furnished to do so, subject to the following
009     * conditions:
010     * 
011     * The above copyright notice and this permission notice shall be included in all copies
012     * or substantial portions of the Software.
013     * 
014     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
015     * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
016     * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
017     * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
018     * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
019     * DEALINGS IN THE SOFTWARE.
020     * 
021     */
022    
023    package org.apache.directory.shared.asn1.der;
024    
025    
026    /**
027     * class for breaking up an OID into it's component tokens, ala
028     * java.util.StringTokenizer. We need this class as some of the lightweight Java
029     * environment don't support classes like StringTokenizer.
030     */
031    public class OIDTokenizer
032    {
033        private String oid;
034    
035        private int index;
036    
037    
038        public OIDTokenizer(String oid)
039        {
040            this.oid = oid;
041            this.index = 0;
042        }
043    
044    
045        public boolean hasMoreTokens()
046        {
047            return ( index != -1 );
048        }
049    
050    
051        public String nextToken()
052        {
053            if ( index == -1 )
054            {
055                return null;
056            }
057    
058            String token;
059            int end = oid.indexOf( '.', index );
060    
061            if ( end == -1 )
062            {
063                token = oid.substring( index );
064                index = -1;
065                return token;
066            }
067    
068            token = oid.substring( index, end );
069    
070            index = end + 1;
071            return token;
072        }
073    }