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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
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       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,
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   See the License for the specific language governing permissions and
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package org.apache.poi.common.usermodel.fonts;

/**
 * A property of a font that describes the pitch, of the characters.
 * 
 * @since POI 3.17-beta2
 */
public enum FontPitch {
    /**
     * The default pitch, which is implementation-dependent.
     */
    DEFAULT (0x00),
    /**
     * A fixed pitch, which means that all the characters in the font occupy the same
     * width when output in a string.
     */
    FIXED (0x01),
    /**
     * A variable pitch, which means that the characters in the font occupy widths
     * that are proportional to the actual widths of the glyphs when output in a string. For example,
     * the "i" and space characters usually have much smaller widths than a "W" or "O" character.
     */
    VARIABLE (0x02);

    private int nativeId;
    FontPitch(int nativeId) {
        this.nativeId = nativeId;
    }

    public int getNativeId() {
        return nativeId;
    }

    public static FontPitch valueOf(int flag) {
        for (FontPitch fp : values()) {
            if (fp.nativeId == flag) return fp;
        }
        return null;
    }
    
    /**
     * Combine pitch and family to native id
     * 
     * @see LOGFONT structure
     *
     * @param pitch The pitch-value, cannot be null
     * @param family The family-value, cannot be null
     *
     * @return The resulting combined byte-value with pitch and family encoded into one byte
     */
    public static byte getNativeId(FontPitch pitch, FontFamily family) {
        return (byte)(pitch.getNativeId() | (family.getFlag() << 4));
    }

    /**
     * Get FontPitch from native id
     *
     * @param pitchAndFamily The combined byte value for pitch and family
     *
     * @return The resulting FontPitch enumeration value
     */
    public static FontPitch valueOfPitchFamily(byte pitchAndFamily) {
        return valueOf(pitchAndFamily & 0x3);
    }
}