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iText, a free Java-PDF library
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/*
 * $Id: HyphenationAuto.java 6134 2013-12-23 13:15:14Z blowagie $
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2014 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: [email protected]
 */
package com.itextpdf.text.pdf;

import com.itextpdf.text.pdf.hyphenation.Hyphenation;
import com.itextpdf.text.pdf.hyphenation.Hyphenator;

/** Hyphenates words automatically accordingly to the language and country.
 * The hyphenator engine was taken from FOP and uses the TEX patterns. If a language
 * is not provided and a TEX pattern for it exists, it can be easily adapted.
 *
 * @author Paulo Soares
 */
public class HyphenationAuto implements HyphenationEvent {

    /** The hyphenator engine.
     */    
    protected Hyphenator hyphenator;
    /** The second part of the hyphenated word.
     */    
    protected String post;
    
    /** Creates a new hyphenation instance usable in Chunk.
     * @param lang the language ("en" for English, for example)
     * @param country the country ("GB" for Great-Britain or "none" for no country, for example)
     * @param leftMin the minimum number of letters before the hyphen
     * @param rightMin the minimum number of letters after the hyphen
     */    
    public HyphenationAuto(String lang, String country, int leftMin, int rightMin) {
        hyphenator = new Hyphenator(lang, country, leftMin, rightMin);
    }

    /** Gets the hyphen symbol.
     * @return the hyphen symbol
     */    
    public String getHyphenSymbol() {
        return "-";
    }
    
    /** Hyphenates a word and returns the first part of it. To get
     * the second part of the hyphenated word call getHyphenatedWordPost().
     * @param word the word to hyphenate
     * @param font the font used by this word
     * @param fontSize the font size used by this word
     * @param remainingWidth the width available to fit this word in
     * @return the first part of the hyphenated word including
     * the hyphen symbol, if any
     */    
    public String getHyphenatedWordPre(String word, BaseFont font, float fontSize, float remainingWidth) {
        post = word;
        String hyphen = getHyphenSymbol();
        float hyphenWidth = font.getWidthPoint(hyphen, fontSize);
        if (hyphenWidth > remainingWidth)
            return "";
        Hyphenation hyphenation = hyphenator.hyphenate(word);
        if (hyphenation == null) {
            return "";
        }
        int len = hyphenation.length();
        int k;
        for (k = 0; k < len; ++k) {
            if (font.getWidthPoint(hyphenation.getPreHyphenText(k), fontSize) + hyphenWidth > remainingWidth)
                break;
        }
        --k;
        if (k < 0)
            return "";
        post = hyphenation.getPostHyphenText(k);
        return hyphenation.getPreHyphenText(k) + hyphen;
    }
    
    /** Gets the second part of the hyphenated word. Must be called
     * after getHyphenatedWordPre().
     * @return the second part of the hyphenated word
     */    
    public String getHyphenatedWordPost() {
        return post;
    }
    
}