fullstringtokenizer.java

这是学习Java必须读懂两套源代码

/**
 * $RCSfile: FullStringTokenizer.java,v $
 * $Revision: 1.1.2.2 $
 * $Date: 2001/02/12 17:37:29 $
 *
 * Copyright (C) 2000 CoolServlets.com. All rights reserved.
 *
 * ===================================================================
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        CoolServlets.com (http://www.Yasna.com)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Jive" and "CoolServlets.com" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please
 *    contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Jive",
 *    nor may "Jive" appear in their name, without prior written
 *    permission of CoolServlets.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL COOLSERVLETS.COM OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of CoolServlets.com. For more information
 * on CoolServlets.com, please see <http://www.Yasna.com>.
 */

package com.Yasna.util;

public class FullStringTokenizer {

    private String string;
    private String delimiter;

    private int index = 0;
    private int length = 0;
    private int delimiterLength;

    public FullStringTokenizer(String string, String delimiter) {
        this.string = string;
        this.delimiter = delimiter;
        delimiterLength = delimiter.length();
        length = string.length();
    }

   /**
    * Determine if there are more tokens available
    */
    public boolean hasMoreTokens() {
        return (index < length);
    }

   /**
    * Get the next token
    */
    public String nextToken() {
        String s = this.string;
        int nextToken = s.indexOf(delimiter, index);
        //Done finding tokens
        if (nextToken < 0) {
            // fixed to return whatever is left in the string (for the case
            // of "[tok]data[tok]data" <- no ending token)
            String tok = s.substring(index,length);
            index = length;
            return tok;
        }
        else if (nextToken == index) {
            //We found an empty token
            index += delimiterLength;
            return "";
        }
        else {
            String result = s.substring(index, nextToken);
            index = nextToken + delimiterLength;
            return result;
        }
    }

    /**
     * Test program.
     */
    public static void main(String [] args) {
        String testString = "||this is|| a test||||of the system||||";
        FullStringTokenizer tokens = new FullStringTokenizer(testString, "||");
        while(tokens.hasMoreTokens()) {
            System.out.println("> " + tokens.nextToken());
        }
    }
}