/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package com.sun.appserv.management.util.misc;

/**
	Provides a variety of useful utilities for computing hashCode().
 */
 
public final class ObjectUtil
{
		private
	ObjectUtil( )
	{
		// disallow instantiation
	}
	
	
		public static int
	hashCode( final boolean value )
	{
	    return value ? 1 : 0;
	}
	
		public static int
	hashCode( final Object... items )
	{
	    int result  = 0;
	    
	    for( final Object item : items )
	    {
	        result ^= hashCode( item );
	    }
	    return result;
	}
	
		public static int
	hashCode( final Object o )
	{
	    return o == null ? 0 : o.hashCode();
	}
	
		public static int
	hashCode( final long value )
	{
	    return (int)value ^ (int)(value >> 32);
	}
	
		public static int
	hashCode( final double value )
	{
	    return new Double( value ).hashCode();
	}
	
        public static boolean
    equals( final Object s1, final Object s2 )
    {
        boolean equals  = false;
        
        if ( s1 == s2 )
        {
            equals  = true;
        }
        else if ( s1 != null )
        {
            equals  = s1.equals( s2 );
        }
        else
        {
            // s1 is null and s2 isn't
            equals  = false;
        }
        
        return equals;
    }
}