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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.SchemaType;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlErrorCodes;
import org.apache.xmlbeans.SimpleValue;
import org.apache.xmlbeans.impl.common.ValidationContext;

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

import org.apache.xmlbeans.impl.schema.BuiltinSchemaTypeSystem;

public abstract class JavaIntegerHolder extends XmlObjectBase
{
    public SchemaType schemaType()
        { return BuiltinSchemaTypeSystem.ST_INTEGER; }

    private BigInteger _value;

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

    // gets/sets raw text value
    protected String compute_text(NamespaceManager nsm) { return _value.toString(); }
    protected void set_text(String s)
    {
        set_BigInteger(lex(s, _voorVc));
    }
    public static BigInteger lex(String s, ValidationContext vc)
    {
        if (s.length() > 0 && s.charAt( 0 ) == '+' )
            s = s.substring(1);

        try { return new BigInteger(s); }
        catch (Exception e) { vc.invalid(XmlErrorCodes.INTEGER, new Object[] { s }); return null; }
    }
    protected void set_nil()
    {
        _value = null;
    }
    // numerics: fractional
    public BigDecimal getBigDecimalValue() { check_dated(); return _value == null ? null : new BigDecimal(_value); }
    public BigInteger getBigIntegerValue() { check_dated(); return _value; }

    // setters
    protected void set_BigDecimal(BigDecimal v) { _value = v.toBigInteger(); }
    protected void set_BigInteger(BigInteger v) { _value = v; }

    // comparators
    protected int compare_to(XmlObject i)
    {
        if (((SimpleValue)i).instanceType().getDecimalSize() > SchemaType.SIZE_BIG_INTEGER)
            return -i.compareTo(this);

        return _value.compareTo(((XmlObjectBase)i).bigIntegerValue());
    }

    protected boolean equal_to(XmlObject i)
    {
        if (((SimpleValue)i).instanceType().getDecimalSize() > SchemaType.SIZE_BIG_INTEGER)
            return i.valueEquals(this);

        return _value.equals(((XmlObjectBase)i).bigIntegerValue());
    }

    static private BigInteger _maxlong = BigInteger.valueOf(Long.MAX_VALUE);
    static private BigInteger _minlong = BigInteger.valueOf(Long.MIN_VALUE);

    /**
     * Note, this is carefully aligned with hash codes for all xsd:decimal
     * primitives.
     */
    protected int value_hash_code()
    {
        if (_value.compareTo(_maxlong) > 0 ||
            _value.compareTo(_minlong) < 0)
            return _value.hashCode();

        long longval = _value.longValue();

        return (int)((longval >> 32) * 19 + longval);
    }
}