org.arbeitspferde.friesian.RandomNumber.java Source code

Introduction

Here is the source code for org.arbeitspferde.friesian.RandomNumber.java

Source

/* Copyright 2012 Google, Inc.
    
   Licensed 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.arbeitspferde.friesian;

import com.google.common.base.Preconditions;

import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Generates random numbers
 */
class RandomNumber {
    private static final Logger log = Logger.getLogger(RandomNumber.class.getCanonicalName());

    /** Generates a random percentage value, which is an integer from 1 to 100 inclusive */
    public static int generatePercentage(Random rng) {
        return generate(1, 100, rng);
    }

    /** Generates a random number based on the input max and min parameters */
    public static int generate(int min, int max, Random rng) {
        Preconditions.checkArgument(max > 0, "Max must be positive");
        Preconditions.checkArgument(min <= max, "Min must be less than or equal to max");

        int range = max - min;
        int result = min;

        if (range == 0) {
            return min;
        }

        try {
            result = min + rng.nextInt(range + 1);
        } catch (Exception e) {
            log.log(Level.WARNING, String.format("min: %d  min: %d", min, max), e);
        }

        return result;
    }
}