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Java example source code file (RandomAdaptor.java)

This example Java source code file (RandomAdaptor.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

npe, override, randomadaptor, randomgenerator, suppresswarnings, util

The RandomAdaptor.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.random;

import java.util.Random;

/**
 * Extension of <code>java.util.Random wrapping a
 * {@link RandomGenerator}.
 *
 * @since 1.1
 */
public class RandomAdaptor extends Random implements RandomGenerator {

    /** Serializable version identifier. */
    private static final long serialVersionUID = 2306581345647615033L;

    /** Wrapped randomGenerator instance */
    private final RandomGenerator randomGenerator;

    /**
     * Prevent instantiation without a generator argument
     */
    @SuppressWarnings("unused")
    private RandomAdaptor() { randomGenerator = null; }

    /**
     * Construct a RandomAdaptor wrapping the supplied RandomGenerator.
     *
     * @param randomGenerator  the wrapped generator
     */
    public RandomAdaptor(RandomGenerator randomGenerator) {
        this.randomGenerator = randomGenerator;
    }

    /**
     * Factory method to create a <code>Random using the supplied
     * <code>RandomGenerator.
     *
     * @param randomGenerator  wrapped RandomGenerator instance
     * @return a Random instance wrapping the RandomGenerator
     */
    public static Random createAdaptor(RandomGenerator randomGenerator) {
        return new RandomAdaptor(randomGenerator);
    }

    /**
     * Returns the next pseudorandom, uniformly distributed
     * <code>boolean value from this random number generator's
     * sequence.
     *
     * @return  the next pseudorandom, uniformly distributed
     * <code>boolean value from this random number generator's
     * sequence
     */
    @Override
    public boolean nextBoolean() {
        return randomGenerator.nextBoolean();
    }

     /**
     * Generates random bytes and places them into a user-supplied
     * byte array.  The number of random bytes produced is equal to
     * the length of the byte array.
     *
     * @param bytes the non-null byte array in which to put the
     * random bytes
     */
    @Override
    public void nextBytes(byte[] bytes) {
        randomGenerator.nextBytes(bytes);
    }

     /**
     * Returns the next pseudorandom, uniformly distributed
     * <code>double value between 0.0 and
     * <code>1.0 from this random number generator's sequence.
     *
     * @return  the next pseudorandom, uniformly distributed
     *  <code>double value between 0.0 and
     *  <code>1.0 from this random number generator's sequence
     */
    @Override
    public double nextDouble() {
        return randomGenerator.nextDouble();
    }

    /**
     * Returns the next pseudorandom, uniformly distributed <code>float
     * value between <code>0.0 and 1.0 from this random
     * number generator's sequence.
     *
     * @return  the next pseudorandom, uniformly distributed <code>float
     * value between <code>0.0 and 1.0 from this
     * random number generator's sequence
     */
    @Override
    public float nextFloat() {
        return randomGenerator.nextFloat();
    }

    /**
     * Returns the next pseudorandom, Gaussian ("normally") distributed
     * <code>double value with mean 0.0 and standard
     * deviation <code>1.0 from this random number generator's sequence.
     *
     * @return  the next pseudorandom, Gaussian ("normally") distributed
     * <code>double value with mean 0.0 and
     * standard deviation <code>1.0 from this random number
     *  generator's sequence
     */
    @Override
    public double nextGaussian() {
        return randomGenerator.nextGaussian();
    }

     /**
     * Returns the next pseudorandom, uniformly distributed <code>int
     * value from this random number generator's sequence.
     * All 2<font size="-1">32 possible {@code int} values
     * should be produced with  (approximately) equal probability.
     *
     * @return the next pseudorandom, uniformly distributed <code>int
     *  value from this random number generator's sequence
     */
    @Override
    public int nextInt() {
        return randomGenerator.nextInt();
    }

    /**
     * Returns a pseudorandom, uniformly distributed {@code int} value
     * between 0 (inclusive) and the specified value (exclusive), drawn from
     * this random number generator's sequence.
     *
     * @param n the bound on the random number to be returned.  Must be
     * positive.
     * @return  a pseudorandom, uniformly distributed {@code int}
     * value between 0 (inclusive) and n (exclusive).
     * @throws IllegalArgumentException  if n is not positive.
     */
    @Override
    public int nextInt(int n) {
        return randomGenerator.nextInt(n);
    }

    /**
     * Returns the next pseudorandom, uniformly distributed <code>long
     * value from this random number generator's sequence.  All
     * 2<font size="-1">64 possible {@code long} values
     * should be produced with (approximately) equal probability.
     *
     * @return  the next pseudorandom, uniformly distributed <code>long
     *value from this random number generator's sequence
     */
    @Override
    public long nextLong() {
        return randomGenerator.nextLong();
    }

    /** {@inheritDoc} */
    public void setSeed(int seed) {
        if (randomGenerator != null) {  // required to avoid NPE in constructor
            randomGenerator.setSeed(seed);
        }
    }

    /** {@inheritDoc} */
    public void setSeed(int[] seed) {
        if (randomGenerator != null) {  // required to avoid NPE in constructor
            randomGenerator.setSeed(seed);
        }
    }

    /** {@inheritDoc} */
    @Override
    public void setSeed(long seed) {
        if (randomGenerator != null) {  // required to avoid NPE in constructor
            randomGenerator.setSeed(seed);
        }
    }

}

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