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RTF generation library derived from iText-2.1.7. All PDF features and RTF parsing are removed. Code is modernized for Java 8.
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/*
 * $Id: RomanAlphabetFactory.java 3373 2008-05-12 16:21:24Z xlv $
 *
 * Copyright 2007 by Bruno Lowagie.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * https://github.com/osobolev/rtf-gen
 */
package com.lowagie.text.factories;

/**
 * This class can produce String combinations representing a number.
 * "a" to "z" represent 1 to 26, "AA" represents 27, "AB" represents 28,
 * and so on; "ZZ" is followed by "AAA".
 */
public class RomanAlphabetFactory {

    /**
     * Translates a positive integer (not equal to zero)
     * into a String using the letters 'a' to 'z';
     * 1 = a, 2 = b, ..., 26 = z, 27 = aa, 28 = ab,...
     */
    public static String getString(int index) {
        if (index < 1) throw new NumberFormatException(
            "You can't translate a negative number into an alphabetical value.");

        index--;
        int bytes = 1;
        int start = 0;
        int symbols = 26;
        while (index >= symbols + start) {
            bytes++;
            start += symbols;
            symbols *= 26;
        }

        int c = index - start;
        char[] value = new char[bytes];
        while (bytes > 0) {
            value[--bytes] = (char) ('a' + (c % 26));
            c /= 26;
        }

        return new String(value);
    }

    /**
     * Translates a positive integer (not equal to zero)
     * into a String using the letters 'a' to 'z';
     * 1 = a, 2 = b, ..., 26 = z, 27 = aa, 28 = ab,...
     */
    public static String getLowerCaseString(int index) {
        return getString(index);
    }

    /**
     * Translates a positive integer (not equal to zero)
     * into a String using the letters 'A' to 'Z';
     * 1 = A, 2 = B, ..., 26 = Z, 27 = AA, 28 = AB,...
     */
    public static String getUpperCaseString(int index) {
        return getString(index).toUpperCase();
    }

    /**
     * Translates a positive integer (not equal to zero)
     * into a String using the letters 'a' to 'z'
     * (a = 1, b = 2, ..., z = 26, aa = 27, ab = 28,...).
     */
    public static String getString(int index, boolean lowercase) {
        if (lowercase) {
            return getLowerCaseString(index);
        } else {
            return getUpperCaseString(index);
        }
    }
}