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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. 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_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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package org.glassfish.admin.amx.util;

/**
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 Double.valueOf(value).hashCode();
    }

    public static boolean equals(final Object s1, final Object s2)
    {
        boolean equals;

        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;
    }

}