/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * ident        "%Z%%M% %I%     %E% SMI"
 *
 * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 */


/**
 * This is a replacement for StringTokenizer since there
 * is an incompatibility between JDK 1.2 and JDK 1.3.1
 * and beyond which breaks slp.jar support for apps which
 * could use either JDK.
 */

package com.sun.slp;

import java.util.Enumeration;
import java.util.NoSuchElementException;

public class SLPTokenizer implements Enumeration
{

    private String str;
    private String delims;
    private boolean bRetDel;
    private int index;

    private void initialize(String s, String d, boolean b)
    {
        str = s;
        delims = d;
        bRetDel = b;
        index = 0;
    }

    public SLPTokenizer(String s)
    {
        initialize(s, "", false);
    }

    public SLPTokenizer(String s, String delim)
    {
        initialize(s, delim, false);
    }

    public SLPTokenizer(String s, String delim, boolean returnDelims)
    {
        initialize(s, delim, returnDelims);
    }

    /**
     * Calculates the number of times that this tokenizer's
     * nextToken method can be called before it generates an
     * exception.
     */
    public int countTokens()
    {
        int i = 0;

        if (str.length() < 1) {
            return 0;
        }

        char c = str.charAt(0);
        boolean inToken = false;

        // a token starts if
        //  (a) next character is a non delimiter
        //  (b) there are more characters

        for (int j = 0; j < str.length(); j++)
        {
            c = str.charAt(j);
            if (delims.indexOf(c) != -1) {
                if (bRetDel) {
                    i++;
                }

                if (inToken == true) {
                    i++; // we were in a token, now completed it
                    inToken = false;
                }
            } else {

                // To get here, we must be in a token.
                inToken = true;
            }
        }

        if (inToken) {
            i++;
        }

        return i;
    }

    /**
     * Returns the same value as the hasMoreTokens method.
     */

    public boolean hasMoreElements()
    {
        if (str.length() < 1) {
            return false;
        }

        if (index >= str.length()) {
            return false;
        }

        if (bRetDel == false) {
            // Check to see if all there is left are delimiters.
            // If so there are no more elements.
            for (int i = index; i < str.length(); i++) {

                if (delims.indexOf(str.charAt(i)) == -1) {
                    return true;  // A non-delim char found!
                }
            }
            return false; // No non-delim chars remain!
        }

        return true;  // Something remains.
    }

    /**
     * Tests if there are more tokens available from this
     * tokenizer's string.
     */
    public boolean hasMoreTokens()
    {
        return hasMoreElements();
    }

    /**
     * Returns the same value as the nextToken method,
     * except that its declared return value is Object
     * rather than String.
     */
    public Object nextElement()
        throws NoSuchElementException
    {
        return (Object) nextToken();
    }

    /**
     * Returns the next token from this string tokenizer.
     *
     */
    public String nextToken()
        throws NoSuchElementException
    {
        if (index >= str.length()) throw new NoSuchElementException();

        StringBuffer sb = new StringBuffer();
        char c = str.charAt(index);

        if (bRetDel == true)
        {

            if (delims.indexOf(c) != -1) {

                // We begin at a delimiter.  Return it & advance over.
                sb.append(str.charAt(index));
                index++;
                return sb.toString();

            } else {
                // Advance to next delimiter and stop.  Return string.
                while (index < str.length()) {

                    c = str.charAt(index);
                    if (delims.indexOf(c) != -1) {

                        return sb.toString();

                    } else {

                        sb.append(c);

                    }
                    index++;
                }
                // We get here only if this is the last token.
                return sb.toString();
            }
        } else {
            // 3 cases
            //   token till the end
            //   token till a delimiter
            //   only delimiters till the end (exception!)
            while (index < str.length()) {

                c = str.charAt(index);
                if (delims.indexOf(c) != -1) {
                    if (sb.length() != 0) {

                        index++; // Skip past the delimiter.
                        return sb.toString();
                    }
                    index++; // Do not include delimiters if no content yet.

                } else { // Not the delimiter yet.

                    sb.append(c);
                    index++;
                }
            }

            if (sb.length() == 0) {
                throw new NoSuchElementException();
            }

            return sb.toString();
        }
    }

    /**
     * Returns the next token in this string tokenizer's string.
     */
    public String nextToken(String delim)
        throws NoSuchElementException
    {
        String saveDelims = delims;
        delims = delim;
        try
        {
            // This is not thread safe, but it will String.
            // There are no guarantees StringTokenizer is
            // thread safe either.
            String ret = nextToken();
            delims = saveDelims;
            return ret;
        }
        catch (NoSuchElementException nsee)
        {
            delims = saveDelims;
            throw nsee;
        }
    }
}