tokenizer.java

J2ME MIDP_Example_Applications

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
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// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
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// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
// make available the source code in original or modified form only when
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package whiteboard;

import java.util.Enumeration;

class Tokenizer
    implements Enumeration
{
    private final String str;
    private final char delim;
    private boolean hasNext;
    private int current = 0, previous = 0;


    Tokenizer(String str, char c)
    {
        this.str = str;
        this.delim = c;
        findToken();
    }


    private void findToken()
    {
        int i = previous;
        int size = str.length();
        if (i >= size)
        {
            hasNext = false;
            return;
        }
        while (i < size)
        {
            if (delim == str.charAt(i++))
            {
                current = i - 1;
                hasNext = true;
                return;
            }
        }
        current = size;
    }


    public boolean hasMoreElements()
    {
        return hasNext;
    }


    public Object nextElement()
    {
        if (hasNext)
        {
            String result = str.substring(previous, current);
            previous = current + 1;
            findToken();
            return result;
        }
        else
        {
            return null;
        }
    }

}