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/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
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package com.aliyun.openservices.eas.discovery.utils;

import java.util.Random;

/**
 * 

RandomUtils is a wrapper that supports all possible * {@link Random} methods via the {@link Math#random()} * method and its system-wide Random object. * * @author Gary D. Gregory * @version $Id: RandomUtils.java 906320 2010-02-04 01:41:10Z sebb $ * @since 2.0 */ public class RandomUtils { /** * An instance of {@link JVMRandom}. */ public static final Random JVM_RANDOM = new JVMRandom(); // should be possible for JVM_RANDOM? // public static void nextBytes(byte[]) { // public synchronized double nextGaussian(); // } /** *

Returns the next pseudorandom, uniformly distributed int value * from the Math.random() sequence.

* N.B. All values are ge 0. * * @return the random int */ public static int nextInt() { return nextInt(JVM_RANDOM); } /** *

Returns the next pseudorandom, uniformly distributed int value * from the given random sequence.

* * @param random the Random sequence generator. * @return the random int */ public static int nextInt(Random random) { return random.nextInt(); } /** *

Returns a pseudorandom, uniformly distributed int value * between 0 (inclusive) and the specified value * (exclusive), from the Math.random() sequence.

* * @param n the specified exclusive max-value * @return the random int */ public static int nextInt(int n) { return nextInt(JVM_RANDOM, n); } /** *

Returns a pseudorandom, uniformly distributed int value * between 0 (inclusive) and the specified value * (exclusive), from the given Random sequence.

* * @param random the Random sequence generator. * @param n the specified exclusive max-value * @return the random int */ public static int nextInt(Random random, int n) { // check this cannot return 'n' return random.nextInt(n); } /** *

Returns the next pseudorandom, uniformly distributed long value * from the Math.random() sequence.

* N.B. All values are ge 0. * * @return the random long */ public static long nextLong() { return nextLong(JVM_RANDOM); } /** *

Returns the next pseudorandom, uniformly distributed long value * from the given Random sequence.

* * @param random the Random sequence generator. * @return the random long */ public static long nextLong(Random random) { return random.nextLong(); } /** *

Returns the next pseudorandom, uniformly distributed boolean value * from the Math.random() sequence.

* * @return the random boolean */ public static boolean nextBoolean() { return nextBoolean(JVM_RANDOM); } /** *

Returns the next pseudorandom, uniformly distributed boolean value * from the given random sequence.

* * @param random the Random sequence generator. * @return the random boolean */ public static boolean nextBoolean(Random random) { return random.nextBoolean(); } /** *

Returns the next pseudorandom, uniformly distributed float value * between 0.0 and 1.0 from the Math.random() * sequence.

* * @return the random float */ public static float nextFloat() { return nextFloat(JVM_RANDOM); } /** *

Returns the next pseudorandom, uniformly distributed float value * between 0.0 and 1.0 from the given Random * sequence.

* * @param random the Random sequence generator. * @return the random float */ public static float nextFloat(Random random) { return random.nextFloat(); } /** *

Returns the next pseudorandom, uniformly distributed float value * between 0.0 and 1.0 from the Math.random() * sequence.

* * @return the random double */ public static double nextDouble() { return nextDouble(JVM_RANDOM); } /** *

Returns the next pseudorandom, uniformly distributed float value * between 0.0 and 1.0 from the given Random * sequence.

* * @param random the Random sequence generator. * @return the random double */ public static double nextDouble(Random random) { return random.nextDouble(); } }




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