- /* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * 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 acknowledgement:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgement may appear in the software itself,
- * if and wherever such third-party acknowledgements normally appear.
- *
- * 4. The names "The Jakarta Project", "Commons", and "Apache Software
- * Foundation" must not be used to endorse or promote products derived
- * from this software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Software Foundation.
- *
- * 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 THE APACHE SOFTWARE FOUNDATION 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.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- package org.apache.commons.lang.math;
-
- import java.util.Random;
-
- /**
- * <p><code>JVMRandom</code> is a wrapper that supports all possible
- * Random methods via the {@link java.lang.Math#random()} method
- * and its system-wide {@link Random} object.</p>
- *
- * @author Henri Yandell
- * @since 2.0
- * @version $Id: JVMRandom.java,v 1.8 2003/08/18 02:22:24 bayard Exp $
- */
- public final class JVMRandom extends Random {
-
- /**
- * Ensures that only the constructor can call reseed.
- */
- private boolean constructed = false;
-
- public JVMRandom() {
- this.constructed = true;
- }
-
- /**
- * Unsupported in 2.0.
- */
- public synchronized void setSeed(long seed) {
- if (this.constructed) {
- throw new UnsupportedOperationException();
- }
- }
-
- /**
- * Unsupported in 2.0.
- */
- public synchronized double nextGaussian() {
- throw new UnsupportedOperationException();
- }
-
- /**
- * Unsupported in 2.0.
- */
- public void nextBytes(byte[] byteArray) {
- throw new UnsupportedOperationException();
- }
-
- /**
- * <p>Returns the next pseudorandom, uniformly distributed int value
- * from the Math.random() sequence.</p>
- *
- * @return the random int
- */
- public int nextInt() {
- return nextInt(Integer.MAX_VALUE);
- }
- /**
- * <p>Returns a pseudorandom, uniformly distributed int value between
- * <code>0</code> (inclusive) and the specified value (exclusive), from
- * the Math.random() sequence.</p>
- *
- * @param n the specified exclusive max-value
- * @return the random int
- * @throws IllegalArgumentException when <code>n <= 0</code>
- */
- public int nextInt(int n) {
- if (n <= 0) {
- throw new IllegalArgumentException(
- "Upper bound for nextInt must be positive"
- );
- }
- // TODO: check this cannot return 'n'
- return (int)(Math.random() * n);
- }
- /**
- * <p>Returns the next pseudorandom, uniformly distributed long value
- * from the Math.random() sequence.</p>
- * @return the random long
- */
- public long nextLong() {
- // possible loss of precision?
- return nextLong(Long.MAX_VALUE);
- }
-
-
- /**
- * <p>Returns a pseudorandom, uniformly distributed long value between
- * <code>0</code> (inclusive) and the specified value (exclusive), from
- * the Math.random() sequence.</p>
- *
- * @param n the specified exclusive max-value
- * @return the random long
- * @throws IllegalArgumentException when <code>n <= 0</code>
- */
- public static long nextLong(long n) {
- if (n <= 0) {
- throw new IllegalArgumentException(
- "Upper bound for nextInt must be positive"
- );
- }
- // TODO: check this cannot return 'n'
- return (long)(Math.random() * n);
- }
-
- /**
- * <p>Returns the next pseudorandom, uniformly distributed boolean value
- * from the Math.random() sequence.</p>
- *
- * @return the random boolean
- */
- public boolean nextBoolean() {
- return (Math.random() > 0.5);
- }
- /**
- * <p>Returns the next pseudorandom, uniformly distributed float value
- * between <code>0.0</code> and <code>1.0</code> from the Math.random()
- * sequence.</p>
- *
- * @return the random float
- */
- public float nextFloat() {
- return (float)Math.random();
- }
- /**
- * <p>Synonymous to the Math.random() call.</p>
- *
- * @return the random double
- */
- public double nextDouble() {
- return Math.random();
- }
-
- }