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Update #0 - First Release
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LAX1DUDE
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sources/main/java/org/apache/commons/lang3/RandomUtils.java
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sources/main/java/org/apache/commons/lang3/RandomUtils.java
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.lang3;
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import net.lax1dude.eaglercraft.v1_8.EaglercraftRandom;
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/**
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* <p>
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* Utility library that supplements the standard {@link EaglercraftRandom} class.
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* </p>
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*
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* <p>
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* Caveat: Instances of {@link EaglercraftRandom} are not cryptographically secure.
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* </p>
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*
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* <p>
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* Please note that the Apache Commons project provides a component dedicated to
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* pseudo-random number generation, namely
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* <a href="https://commons.apache.org/rng">Commons RNG</a>, that may be a
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* better choice for applications with more stringent requirements (performance
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* and/or correctness).
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* </p>
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*
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* @since 3.3
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*/
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public class RandomUtils {
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/**
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* Random object used by random method. This has to be not local to the random
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* method so as to not return the same value in the same millisecond.
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*/
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private static final EaglercraftRandom RANDOM = new EaglercraftRandom();
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/**
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* <p>
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* {@code RandomUtils} instances should NOT be constructed in standard
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* programming. Instead, the class should be used as
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* {@code RandomUtils.nextBytes(5);}.
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* </p>
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*
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* <p>
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* This constructor is public to permit tools that require a JavaBean instance
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* to operate.
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* </p>
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*/
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public RandomUtils() {
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}
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/**
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* <p>
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* Returns a random boolean value
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* </p>
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*
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* @return the random boolean
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* @since 3.5
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*/
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public static boolean nextBoolean() {
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return RANDOM.nextBoolean();
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}
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/**
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* <p>
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* Creates an array of random bytes.
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* </p>
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*
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* @param count the size of the returned array
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* @return the random byte array
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* @throws IllegalArgumentException if {@code count} is negative
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*/
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public static byte[] nextBytes(final int count) {
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Validate.isTrue(count >= 0, "Count cannot be negative.");
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final byte[] result = new byte[count];
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RANDOM.nextBytes(result);
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return result;
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}
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/**
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* <p>
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* Returns a random integer within the specified range.
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* </p>
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*
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* @param startInclusive the smallest value that can be returned, must be
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* non-negative
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* @param endExclusive the upper bound (not included)
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* @throws IllegalArgumentException if {@code startInclusive > endExclusive} or
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* if {@code startInclusive} is negative
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* @return the random integer
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*/
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public static int nextInt(final int startInclusive, final int endExclusive) {
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Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value.");
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Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative.");
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if (startInclusive == endExclusive) {
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return startInclusive;
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}
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return startInclusive + RANDOM.nextInt(endExclusive - startInclusive);
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}
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/**
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* <p>
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* Returns a random int within 0 - Integer.MAX_VALUE
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* </p>
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*
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* @return the random integer
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* @see #nextInt(int, int)
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* @since 3.5
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*/
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public static int nextInt() {
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return nextInt(0, Integer.MAX_VALUE);
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}
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/**
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* <p>
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* Returns a random long within the specified range.
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* </p>
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*
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* @param startInclusive the smallest value that can be returned, must be
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* non-negative
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* @param endExclusive the upper bound (not included)
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* @throws IllegalArgumentException if {@code startInclusive > endExclusive} or
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* if {@code startInclusive} is negative
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* @return the random long
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*/
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public static long nextLong(final long startInclusive, final long endExclusive) {
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Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value.");
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Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative.");
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if (startInclusive == endExclusive) {
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return startInclusive;
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}
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return startInclusive + nextLong(endExclusive - startInclusive);
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}
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/**
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* <p>
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* Returns a random long within 0 - Long.MAX_VALUE
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* </p>
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*
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* @return the random long
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* @see #nextLong(long, long)
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* @since 3.5
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*/
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public static long nextLong() {
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return nextLong(Long.MAX_VALUE);
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}
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/**
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* Generates a {@code long} value between 0 (inclusive) and the specified value
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* (exclusive).
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*
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* @param n Bound on the random number to be returned. Must be positive.
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* @return a random {@code long} value between 0 (inclusive) and {@code n}
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* (exclusive).
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*/
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private static long nextLong(final long n) {
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// Extracted from o.a.c.rng.core.BaseProvider.nextLong(long)
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long bits;
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long val;
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do {
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bits = RANDOM.nextLong() >>> 1;
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val = bits % n;
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} while (bits - val + (n - 1) < 0);
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return val;
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}
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/**
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* <p>
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* Returns a random double within the specified range.
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* </p>
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*
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* @param startInclusive the smallest value that can be returned, must be
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* non-negative
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* @param endExclusive the upper bound (not included)
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* @throws IllegalArgumentException if {@code startInclusive > endExclusive} or
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* if {@code startInclusive} is negative
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* @return the random double
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*/
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public static double nextDouble(final double startInclusive, final double endExclusive) {
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Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value.");
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Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative.");
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if (startInclusive == endExclusive) {
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return startInclusive;
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}
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return startInclusive + ((endExclusive - startInclusive) * RANDOM.nextDouble());
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}
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/**
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* <p>
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* Returns a random double within 0 - Double.MAX_VALUE
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* </p>
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*
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* @return the random double
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* @see #nextDouble(double, double)
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* @since 3.5
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*/
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public static double nextDouble() {
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return nextDouble(0, Double.MAX_VALUE);
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}
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/**
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* <p>
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* Returns a random float within the specified range.
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* </p>
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*
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* @param startInclusive the smallest value that can be returned, must be
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* non-negative
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* @param endExclusive the upper bound (not included)
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* @throws IllegalArgumentException if {@code startInclusive > endExclusive} or
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* if {@code startInclusive} is negative
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* @return the random float
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*/
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public static float nextFloat(final float startInclusive, final float endExclusive) {
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Validate.isTrue(endExclusive >= startInclusive, "Start value must be smaller or equal to end value.");
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Validate.isTrue(startInclusive >= 0, "Both range values must be non-negative.");
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if (startInclusive == endExclusive) {
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return startInclusive;
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}
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return startInclusive + ((endExclusive - startInclusive) * RANDOM.nextFloat());
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}
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/**
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* <p>
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* Returns a random float within 0 - Float.MAX_VALUE
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* </p>
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*
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* @return the random float
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* @see #nextFloat(float, float)
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* @since 3.5
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*/
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public static float nextFloat() {
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return nextFloat(0, Float.MAX_VALUE);
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}
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}
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