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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*
 *  ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one or more
 *    contributor license agreements.  See the NOTICE file distributed with
 *    this work for additional information regarding copyright ownership.
 *    The ASF licenses this file to You under the Apache License, Version 2.0
 *    (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.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 * ====================================================================
 */

package org.apache.poi.sl.draw;

import java.awt.Font;
import java.awt.Graphics2D;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import org.apache.poi.common.usermodel.fonts.FontInfo;
import org.apache.poi.sl.draw.Drawable.DrawableHint;

/**
 * Manages fonts when rendering slides.
 *
 * Use this class to handle unknown / missing fonts or to substitute fonts
 */
public class DrawFontManagerDefault implements DrawFontManager {

    protected final Set knownSymbolFonts = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);

    public DrawFontManagerDefault() {
        knownSymbolFonts.add("Wingdings");
        knownSymbolFonts.add("Symbol");
    }

    @Override
    public FontInfo getMappedFont(Graphics2D graphics, FontInfo fontInfo) {
        return getFontWithFallback(graphics, Drawable.FONT_MAP, fontInfo);
    }

    @Override
    public FontInfo getFallbackFont(Graphics2D graphics, FontInfo fontInfo) {
        FontInfo fi = getFontWithFallback(graphics, Drawable.FONT_FALLBACK, fontInfo);
        if (fi == null) {
            fi = new DrawFontInfo(Font.SANS_SERIF);
        }
        return fi;
    }

    public String mapFontCharset(Graphics2D graphics, FontInfo fontInfo, String text) {
        // TODO: find a real charset mapping solution instead of hard coding for Wingdings
        return (fontInfo != null && knownSymbolFonts.contains(fontInfo.getTypeface()))
            ? mapSymbolChars(text)
            : text;
    }

    /**
     * Symbol fonts like "Wingdings" or "Symbol" have glyphs mapped to a Unicode private use range via the Java font loader,
     * although a system font viewer might show you the glyphs in the ASCII range.
     * This helper function maps the chars of the text string to the corresponding private use range chars.
     *
     * @param text the input string, typically consists of ASCII chars
     * @return the mapped string, typically consists of chars in the range of 0xf000 to 0xf0ff
     *
     * @since POI 4.0.0
     */
    public static String mapSymbolChars(String text) {
        // wingdings doesn't contain high-surrogates, so chars are ok
        boolean changed = false;
        char[] chrs = text.toCharArray();
        for (int i=0; i fontMap = (Map)graphics.getRenderingHint(hint);
        if (fontMap == null) {
            return fontInfo;
        }
        
        String f = (fontInfo != null) ? fontInfo.getTypeface() : null;
        String mappedTypeface = null;
        if (fontMap.containsKey(f)) {
            mappedTypeface = fontMap.get(f);
        } else if (fontMap.containsKey("*")) {
            mappedTypeface = fontMap.get("*");
        }

        return (mappedTypeface != null) ? new DrawFontInfo(mappedTypeface) : fontInfo;
    }
}