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Original JDBM Implementation
There is a newer version: 2.0.0-M3
/**
 * JDBM LICENSE v1.00
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "JDBM" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Cees de Groot.  For written permission,
 *    please contact [email protected].
 *
 * 4. Products derived from this Software may not be called "JDBM"
 *    nor may "JDBM" appear in their names without prior written
 *    permission of Cees de Groot.
 *
 * 5. Due credit should be given to the JDBM Project
 *    (http://jdbm.sourceforge.net/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE JDBM PROJECT AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * CEES DE GROOT OR ANY CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) Alex Boisvert. All Rights Reserved.
 * Contributions are Copyright (C) 2001 by their associated contributors.
 *
 */

package jdbm.helper;


import java.io.Serializable;
import java.util.Comparator;

import jdbm.I18n;


/**
 * Comparator for Integer objects.
 *
 * @author Christof Dallermassl
 */
public final class IntegerComparator
    implements Comparator, Serializable
{

    /**
     * Version id for serialization.
     */
    final static long serialVersionUID = 1L;


    /**
     * Compare two objects.
     *
     * @param obj1 First object
     * @param obj2 Second object
     * @return a positive integer if obj1 > obj2, 0 if obj1 == obj2,
     *         and a negative integer if obj1 < obj2
     */
    public int compare( Integer obj1, Integer obj2 )
    {
        if ( obj1 == obj2 )
        {
            return 0;
        }

        if ( obj1 == null )
        {
            throw new IllegalArgumentException( I18n.err( I18n.ERR_525 ) );
        }

        if ( obj2 == null )
        {
            throw new IllegalArgumentException( I18n.err( I18n.ERR_526 ) );
        }

        // complicated to avoid usage of Integer.compareTo, as this
        // method is Java 1.2 only!
        int int1 = obj1.intValue();
        int int2 = obj2.intValue();
        if ( int1 == int2 )
        {
            return 0;
        }

        if ( int1 < int2 )
        {
            return -1;
        }
        else
        {
            return 1;
        }
    }

}