OIDTokenizer.java

/**
 *
 * Copyright 2003-2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.geronimo.util.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;
    }
}