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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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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed 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.xmlbeans.impl.values;

import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlErrorCodes;
import org.apache.xmlbeans.SchemaType;
import org.apache.xmlbeans.impl.schema.BuiltinSchemaTypeSystem;
import org.apache.xmlbeans.impl.common.ValidationContext;
import org.apache.xmlbeans.impl.util.XsTypeConverter;

import java.math.BigDecimal;
import java.math.BigInteger;

public abstract class JavaDoubleHolder extends XmlObjectBase
{
    public SchemaType schemaType()
        { return BuiltinSchemaTypeSystem.ST_DOUBLE; }

    double _value;

    // SIMPLE VALUE ACCESSORS BELOW -------------------------------------------

    // gets/sets raw text value
    protected String compute_text(NamespaceManager nsm) { return serialize(_value); }

    public static String serialize(double d)
    {
        if (d == Double.POSITIVE_INFINITY)
            return "INF";
        else if (d == Double.NEGATIVE_INFINITY)
            return "-INF";
        else if (d == Double.NaN)
            return "NaN";
        else
            return Double.toString(d);
    }
    protected void set_text(String s)
    {
        set_double(validateLexical(s,_voorVc));
    }
    public static double validateLexical(String v, ValidationContext context)
    {
        try
        {
            return XsTypeConverter.lexDouble(v);
        }
        catch(NumberFormatException e)
        {
            context.invalid(XmlErrorCodes.DOUBLE, new Object[]{v});

            return Double.NaN;
        }
    }
    protected void set_nil()
    {
        _value = 0.0;
    }

    // numerics: fractional
    public BigDecimal getBigDecimalValue() { check_dated(); return new BigDecimal(_value); }
    public double getDoubleValue() { check_dated(); return _value; }
    public float getFloatValue() { check_dated(); return (float)_value; }

    // setters
    protected void set_double(double v) { _value = v; }
    protected void set_float(float v) { set_double((double)v); }
    protected void set_long(long v) { set_double((double)v); }
    protected void set_BigDecimal(BigDecimal v) { set_double(v.doubleValue()); }
    protected void set_BigInteger(BigInteger v) { set_double(v.doubleValue()); }

    // comparators
    protected int compare_to(XmlObject d)
    {
        return compare(_value,((XmlObjectBase)d).doubleValue());
    }
    static int compare(double thisValue, double thatValue)
    {
        if (thisValue < thatValue) return -1;
        if (thisValue > thatValue) return  1;

        long thisBits = Double.doubleToLongBits(thisValue);
        long thatBits = Double.doubleToLongBits(thatValue);

        return thisBits == thatBits ? 0 : thisBits < thatBits ? -1 : 1;
    }

    protected boolean equal_to(XmlObject d)
    {
        return compare(_value, ((XmlObjectBase)d).doubleValue()) == 0;
    }

    protected int value_hash_code()
    {
        long v = Double.doubleToLongBits(_value);
        return (int)((v >> 32) * 19 + v);
    }
}