Here you can find the source of multiplyRelativeTimeMillis(long duration, long multiplier)
| Parameter | Description |
|---|---|
| duration | a time duration expressed in milliseconds. |
| multiplier | a non-negative value which will be multiplied against the duration. |
public static long multiplyRelativeTimeMillis(long duration, long multiplier)
//package com.java2s; /*// w w w . j a v a 2 s . c o m * 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. */ public class Main { /** * Multiplies a duration in relative milliseconds by a multiplier while * accounting for overflow and underflow of the magnitude value. * * @param duration a time duration expressed in milliseconds. * @param multiplier a non-negative value which will be multiplied against * the duration. * @return a time duration expressed in milliseconds. */ public static long multiplyRelativeTimeMillis(long duration, long multiplier) { if (multiplier < 0) { throw new IllegalArgumentException( "Only non-negative multipliers are allowed."); } long result_mag = (Long.MIN_VALUE != duration) ? Long .highestOneBit(Math.abs(duration)) + Long.highestOneBit(multiplier) : Long.SIZE + Long.highestOneBit(multiplier); long result = duration * multiplier; if (result_mag > (Long.SIZE - 1)) { // over or underflowed result = (duration < 0) ? Long.MIN_VALUE : Long.MAX_VALUE; } return result; } }