Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (c) 2002-2007 Sun Microsystems, Inc.  All rights reserved.
 *
 *  The Sun Project JXTA(TM) Software License
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *
 *  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 end-user documentation included with the redistribution, if any, must
 *     include the following acknowledgment: "This product includes software
 *     developed by Sun Microsystems, Inc. for JXTA(TM) technology."
 *     Alternately, this acknowledgment may appear in the software itself, if
 *     and wherever such third-party acknowledgments normally appear.
 *
 *  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *     not be used to endorse or promote products derived from this software
 *     without prior written permission. For written permission, please contact
 *     Project JXTA at http://www.jxta.org.
 *
 *  5. Products derived from this software may not be called "JXTA", nor may
 *     "JXTA" appear in their name, without prior written permission of Sun.
 *
 *  THIS SOFTWARE IS PROVIDED ``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 SUN
 *  MICROSYSTEMS OR ITS 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.
 *
 *  JXTA is a registered trademark of Sun Microsystems, Inc. in the United
 *  States and other countries.
 *
 *  Please see the license information page at :
 *  <http://www.jxta.org/project/www/license.html> for instructions on use of
 *  the license in source files.
 *
 *  ====================================================================
 *
 *  This software consists of voluntary contributions made by many individuals
 *  on behalf of Project JXTA. For more information on Project JXTA, please see
 *  http://www.jxta.org.
 *
 *  This license is based on the BSD license adopted by the Apache Foundation.
 */

import java.lang.reflect.Array;

public class Main {
    private static final int fODD_PRIME_NUMBER = 37;

    /** Hash code for <tt>boolean</tt> primitives. */
    public static int hash(int aSeed, boolean aBoolean) {

        return firstTerm(aSeed) + (aBoolean ? 1 : 0);
    }

    /** Hash code for <tt>char</tt> primitives. */
    public static int hash(int aSeed, char aChar) {

        return firstTerm(aSeed) + aChar;
    }

    /**
     Hash code for <tt>int</tt> primitives.
     <P>Note that <tt>byte</tt> and <tt>short</tt> are also handled by this method, through implicit conversion.
     */
    public static int hash(int aSeed, int aInt) {

        return firstTerm(aSeed) + aInt;
    }

    /** Hash code for <tt>long</tt> primitives.  */
    public static int hash(int aSeed, long aLong) {

        return firstTerm(aSeed) + (int) (aLong ^ (aLong >>> 32));
    }

    /** Hash code for <tt>float</tt> primitives.  */
    public static int hash(int aSeed, float aFloat) {

        return hash(aSeed, Float.floatToIntBits(aFloat));
    }

    /** Hash code for <tt>double</tt> primitives.  */
    public static int hash(int aSeed, double aDouble) {

        return hash(aSeed, Double.doubleToLongBits(aDouble));
    }

    /**
     Hash code for an Object.
        
     <P><tt>aObject</tt> is a possibly-null object field, and possibly an array.
        
     If <tt>aObject</tt> is an array, then each element may be a primitive
     or a possibly-null object.
     */
    public static int hash(int aSeed, Object aObject) {

        int result = aSeed;

        if (aObject == null) {

            result = hash(result, 0);
        } else if (!isArray(aObject)) {

            result = hash(result, aObject.hashCode());
        } else {

            int length = Array.getLength(aObject);

            for (int idx = 0; idx < length; ++idx) {

                Object item = Array.get(aObject, idx);

                //recursive call!
                result = hash(result, item);
            }
        }

        return result;
    }

    private static int firstTerm(int aSeed) {

        return fODD_PRIME_NUMBER * aSeed;
    }

    private static boolean isArray(Object aObject) {

        return (aObject != null) && aObject.getClass().isArray();
    }
}