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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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/*
 * Copyright 2005 by Michael Niedermair.
 *
 * 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;

/**
 * Chapter with auto numbering.
 *
 * @author Michael Niedermair
 */
public class ChapterAutoNumber extends Chapter {

    // constant
    private static final long serialVersionUID = -9217457637987854167L;

    /**
     * Is the chapter number already set?
     *
     * @since 2.1.4
     */
    protected boolean numberSet = false;

    /**
     * Create a new object.
     *
     * @param para the Chapter title (as a Paragraph)
     */
    public ChapterAutoNumber(Paragraph para) {
        super(para, 0);
    }

    /**
     * Create a new object.
     *
     * @param title the Chapter title (as a String)
     */
    public ChapterAutoNumber(String title) {
        super(title, 0);
    }

    /**
     * Create a new section for this chapter and ad it.
     *
     * @param title the Section title (as a String)
     * @return Returns the new section.
     */
    public Section addSection(String title) {
        if (isAddedCompletely()) {
            throw new IllegalStateException("This LargeElement has already been added to the Document.");
        }
        return addSection(title, 2);
    }

    /**
     * Create a new section for this chapter and add it.
     *
     * @param title the Section title (as a Paragraph)
     * @return Returns the new section.
     */
    public Section addSection(Paragraph title) {
        if (isAddedCompletely()) {
            throw new IllegalStateException("This LargeElement has already been added to the Document.");
        }
        return addSection(title, 2);
    }

    /**
     * Changes the Chapter number.
     *
     * @param    number    the new chapter number
     * @since 2.1.4
     */
    public int setAutomaticNumber(int number) {
        if (!numberSet) {
            number++;
            super.setChapterNumber(number);
            numberSet = true;
        }
        return number;
    }
}