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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.xslf.util;

import java.awt.Font;
import java.awt.FontFormatException;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Stream;

import de.rototor.pdfbox.graphics2d.PdfBoxGraphics2DFontTextDrawer;
import org.apache.pdfbox.pdmodel.font.PDFont;

public class PDFFontMapper extends PdfBoxGraphics2DFontTextDrawer {

    private static final String DEFAULT_TTF_PATTERN = ".*\\.tt[fc]";

    private static final String FONTDIRS_MAC =
        "$HOME/Library/Fonts;" +
        "/Library/Fonts;" +
        "/Network/Library/Fonts;" +
        "/System/Library/Fonts;" +
        "/System Folder/Fonts";

    private static final String FONTDIRS_WIN =
        "C:\\Windows\\Fonts";

    private static final String FONTDIRS_UNX =
        "/usr/share/fonts;" +
        "/usr/local/share/fonts;" +
        "$HOME/.fonts";


    private final Map fonts = new HashMap<>();
    private final Set registered = new HashSet<>();

    public PDFFontMapper(String fontDir, String fontTtf) {
        registerFonts(fontDir, fontTtf);
    }


    private void registerFonts(String fontDir, String fontTtf) {
        if (fontDir == null) {
            String OS = System.getProperty("os.name", "generic").toLowerCase(Locale.ROOT);
            if (OS.contains("mac") || OS.contains("darwin")) {
                fontDir = FONTDIRS_MAC;
            } else if (OS.contains("win")) {
                fontDir = FONTDIRS_WIN;
            } else {
                fontDir = FONTDIRS_UNX;
            }
        }

        String fd = fontDir.replace("$HOME", System.getProperty("user.home"));
        final LinkedList dirs = new LinkedList<>();
        Stream.of(fd.split(";")).map(File::new).filter(File::isDirectory).forEach(dirs::add);

        Pattern p = Pattern.compile(fontTtf == null ? DEFAULT_TTF_PATTERN : fontTtf);

        while (!dirs.isEmpty()) {
            File[] ttfs = dirs.removeFirst().listFiles((f, n) -> {
                File f2 = new File(f, n);
                if (f2.isDirectory()) {
                    dirs.add(f2);
                    return false;
                } else {
                    return p.matcher(n).matches();
                }
            });

            if (ttfs == null) {
                continue;
            }

            for (File f : ttfs) {
                try {
                    Font font = Font.createFont(Font.TRUETYPE_FONT, f);
                    fonts.put(font.getFontName(Locale.ROOT), f);
                } catch (IOException|FontFormatException ignored) {
                }

            }
        }
    }

    @Override
    protected PDFont mapFont(Font font, IFontTextDrawerEnv env) throws IOException, FontFormatException {
        String name = font.getFontName(Locale.ROOT);
        if (!registered.contains(name)) {
            registered.add(name);
            File f = fonts.get(name);
            if (f != null) {
                super.registerFont(name, f);
            }
        }
        return super.mapFont(font, env);
    }
}